https://wiki.adcirc.org/index.php?title=Wind_Stress&feed=atom&action=history
Wind Stress - Revision history
2024-03-28T13:08:07Z
Revision history for this page on the wiki
MediaWiki 1.38.1
https://wiki.adcirc.org/index.php?title=Wind_Stress&diff=1144&oldid=prev
Taylorgasher: /* Interpolating Roughness Lengths Before v55 */ adding video
2024-03-22T18:34:19Z
<p><span dir="auto"><span class="autocomment">Interpolating Roughness Lengths Before v55: </span> adding video</span></p>
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<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">← Older revision</td>
<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 14:34, 22 March 2024</td>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>=== Older Behavior ===</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>=== Older Behavior ===</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>====Interpolating Roughness Lengths Before v55====</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>====Interpolating Roughness Lengths Before v55====</div></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>[[File:WindTraceV2.png|right|<del style="font-weight: bold; text-decoration: none;">thumb</del>|Comparison of output wind velocities using old and new methods.]]</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>[[File:WindTraceV2.png|right|<ins style="font-weight: bold; text-decoration: none;">frameless</ins>|Comparison of output wind velocities using old and new methods.]]</div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div> </div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>{{ADC version|version=55|relation=lt}}Before version 55, the directional wind reductions were applied by determining which of the 12 directional bins the wind velocity (at each time step) fell into, and using that roughness reduction, i.e. nearest neighbor interpolation. Starting in version 55, the roughness length is linearly (in angle space) interpolated between directional bins. In testing, this has been found to generally have a very small effect on water levels, but a notable effect on wind speeds, since time evolution of winds is smoother. It can have large localized effects on water levels in cases where there are large changes in neighboring roughness length bins coinciding with well-aligned winds, as in [[:File:MaxeleDiffRun13MinusRun12View1.png|this test case]] with Hurricane Isaac. </div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>{{ADC version|version=55|relation=lt}}Before version 55, the directional wind reductions were applied by determining which of the 12 directional bins the wind velocity (at each time step) fell into, and using that roughness reduction, i.e. nearest neighbor interpolation. Starting in version 55, the roughness length is linearly (in angle space) interpolated between directional bins. In testing, this has been found to generally have a very small effect on water levels, but a notable effect on wind speeds, since time evolution of winds is smoother. It can have large localized effects on water levels in cases where there are large changes in neighboring roughness length bins coinciding with well-aligned winds, as in [[:File:MaxeleDiffRun13MinusRun12View1.png|this test case]] with Hurricane Isaac. </div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">[[File:Run03masterVsRun05interp trimmedAndAnnotatedTry7-min.gif|thumb|500px|Video of wind speeds before (left) and after (right) adding linear interpolation of surface roughness.]]</ins></div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><br clear=all></div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><br clear=all></div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr>
</table>
Taylorgasher
https://wiki.adcirc.org/index.php?title=Wind_Stress&diff=1142&oldid=prev
Taylorgasher: /* Interpolating Roughness Lengths Before v55 */ typo
2024-03-22T18:23:35Z
<p><span dir="auto"><span class="autocomment">Interpolating Roughness Lengths Before v55: </span> typo</span></p>
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<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 14:23, 22 March 2024</td>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>====Interpolating Roughness Lengths Before v55====</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>====Interpolating Roughness Lengths Before v55====</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>[[File:WindTraceV2.png|right|thumb|Comparison of output wind velocities using old and new methods.]]</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>[[File:WindTraceV2.png|right|thumb|Comparison of output wind velocities using old and new methods.]]</div></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>{{ADC version|version=55|relation=lt}}Before version 55, the directional wind reductions were applied by determining which of the 12 directional bins the wind velocity (at each time step) fell into, and using that roughness reduction, i.e. nearest neighbor interpolation. Starting in version 55, the roughness length is linearly (in angle space) interpolated between directional bins. In testing, this has been found to generally have a very small effect on water levels, but a notable effect on wind speeds, since time evolution of winds is smoother. It can have large localized effects on water levels <del style="font-weight: bold; text-decoration: none;">in rare cases </del>in cases where there are large changes in neighboring roughness length bins coinciding with well-aligned winds, as in [[:File:MaxeleDiffRun13MinusRun12View1.png|this test case]] with Hurricane Isaac. </div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>{{ADC version|version=55|relation=lt}}Before version 55, the directional wind reductions were applied by determining which of the 12 directional bins the wind velocity (at each time step) fell into, and using that roughness reduction, i.e. nearest neighbor interpolation. Starting in version 55, the roughness length is linearly (in angle space) interpolated between directional bins. In testing, this has been found to generally have a very small effect on water levels, but a notable effect on wind speeds, since time evolution of winds is smoother. It can have large localized effects on water levels in cases where there are large changes in neighboring roughness length bins coinciding with well-aligned winds, as in [[:File:MaxeleDiffRun13MinusRun12View1.png|this test case]] with Hurricane Isaac. </div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><br clear=all></div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><br clear=all></div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr>
</table>
Taylorgasher
https://wiki.adcirc.org/index.php?title=Wind_Stress&diff=1130&oldid=prev
Taylorgasher: /* Powell Drag Formulation */
2022-11-17T04:53:57Z
<p><span dir="auto"><span class="autocomment">Powell Drag Formulation</span></span></p>
<table style="background-color: #fff; color: #202122;" data-mw="interface">
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<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 00:53, 17 November 2022</td>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>=== Powell Drag Formulation ===</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>=== Powell Drag Formulation ===</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><span style="color:red">CONTRIBUTOR NEEDED</span></div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><span style="color:red">CONTRIBUTOR NEEDED</span></div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">Note that the code for the Powell drag law has not been configured to reverse orientation in the southern hemisphere, and so will produce the wrong results. For details on Powell, see [https://ccht.ccee.ncsu.edu/wind-drag-based-on-storm-sectors/ this post].</ins></div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;"></ins></div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>=== IceCube Drag Formulation ===</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>=== IceCube Drag Formulation ===</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><span style="color:red">CONTRIBUTOR NEEDED</span></div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><span style="color:red">CONTRIBUTOR NEEDED</span></div></td></tr>
</table>
Taylorgasher
https://wiki.adcirc.org/index.php?title=Wind_Stress&diff=1059&oldid=prev
Taylorgasher: /* Interpolating Roughness Lengths Before v55 */ added link to maxele diff
2020-07-10T14:51:45Z
<p><span dir="auto"><span class="autocomment">Interpolating Roughness Lengths Before v55: </span> added link to maxele diff</span></p>
<table style="background-color: #fff; color: #202122;" data-mw="interface">
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<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 10:51, 10 July 2020</td>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>====Interpolating Roughness Lengths Before v55====</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>====Interpolating Roughness Lengths Before v55====</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>[[File:WindTraceV2.png|right|thumb|Comparison of output wind velocities using old and new methods.]]</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>[[File:WindTraceV2.png|right|thumb|Comparison of output wind velocities using old and new methods.]]</div></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>{{ADC version|version=55|relation=lt}}Before version 55, the directional wind reductions were applied by determining which of the 12 directional bins the wind velocity (at each time step) fell into, and using that roughness reduction, i.e. nearest neighbor interpolation. Starting in version 55, the roughness length is linearly (in angle space) interpolated between directional bins. In testing, this has been found to generally have a very small effect on water levels, but a notable effect on wind speeds, since time evolution of winds is smoother. It can have large localized effects on water levels in rare cases in cases where there are large changes in neighboring roughness length bins coinciding with well-aligned winds. </div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>{{ADC version|version=55|relation=lt}}Before version 55, the directional wind reductions were applied by determining which of the 12 directional bins the wind velocity (at each time step) fell into, and using that roughness reduction, i.e. nearest neighbor interpolation. Starting in version 55, the roughness length is linearly (in angle space) interpolated between directional bins. In testing, this has been found to generally have a very small effect on water levels, but a notable effect on wind speeds, since time evolution of winds is smoother. It can have large localized effects on water levels in rare cases in cases where there are large changes in neighboring roughness length bins coinciding with well-aligned winds<ins style="font-weight: bold; text-decoration: none;">, as in [[:File:MaxeleDiffRun13MinusRun12View1.png|this test case]] with Hurricane Isaac</ins>. </div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><br clear=all></div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><br clear=all></div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;"></ins></div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>====Roughness Reduction Bug Before v54====</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>====Roughness Reduction Bug Before v54====</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>{{ADC version|version=54|relation=lt}}Before version 54, there was a bug in this calculation. The mistake and its effects are addressed in this PDF document: <u><span style="color:red">'''ADD A LINK TO A PDF HERE YOOOOO'''</span></u>.</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>{{ADC version|version=54|relation=lt}}Before version 54, there was a bug in this calculation. The mistake and its effects are addressed in this PDF document: <u><span style="color:red">'''ADD A LINK TO A PDF HERE YOOOOO'''</span></u>.</div></td></tr>
</table>
Taylorgasher
https://wiki.adcirc.org/index.php?title=Wind_Stress&diff=1044&oldid=prev
Taylorgasher: /* Converting Wind Velocity to Wind Stress */
2020-07-08T17:05:17Z
<p><span dir="auto"><span class="autocomment">Converting Wind Velocity to Wind Stress</span></span></p>
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<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 13:05, 8 July 2020</td>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>== Converting Wind Velocity to Wind Stress ==</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>== Converting Wind Velocity to Wind Stress ==</div></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>In ADCIRC, four formulations are available to convert wind <del style="font-weight: bold; text-decoration: none;">speeds </del>to the wind stresses applied in the momentum equations. Although there are several ways to control this, users are generally encouraged to use the [[metControl]] namelist in the [[fort.15]] file. The default drag formulation is the Garratt</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>In ADCIRC, four formulations are available to convert wind <ins style="font-weight: bold; text-decoration: none;">velocities </ins>to the wind stresses applied in the momentum equations. Although there are several ways to control this, users are generally encouraged to use the [[metControl]] namelist in the [[fort.15]] file. The default drag formulation is the Garratt</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><ref name=garratt1977>Garratt, J.R., 1977. Review of Drag Coefficients over Oceans and Continents. Mon. Wea. Rev. 105, 915–929. https://doi.org/10.1175/1520-0493(1977)105<0915:RODCOO>2.0.CO;2</ref></div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><ref name=garratt1977>Garratt, J.R., 1977. Review of Drag Coefficients over Oceans and Continents. Mon. Wea. Rev. 105, 915–929. https://doi.org/10.1175/1520-0493(1977)105<0915:RODCOO>2.0.CO;2</ref></div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>linear formula. An alternative for use with tropical cyclones is the Powell formulation,</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>linear formula. An alternative for use with tropical cyclones is the Powell formulation,</div></td></tr>
</table>
Taylorgasher
https://wiki.adcirc.org/index.php?title=Wind_Stress&diff=1043&oldid=prev
Taylorgasher: Improved figure format
2020-07-08T16:37:54Z
<p>Improved figure format</p>
<table style="background-color: #fff; color: #202122;" data-mw="interface">
<col class="diff-marker" />
<col class="diff-content" />
<col class="diff-marker" />
<col class="diff-content" />
<tr class="diff-title" lang="en">
<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">← Older revision</td>
<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 12:37, 8 July 2020</td>
</tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l24">Line 24:</td>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>=== Older Behavior ===</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>=== Older Behavior ===</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>====Interpolating Roughness Lengths Before v55====</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>====Interpolating Roughness Lengths Before v55====</div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">[[File:WindTraceV2.png|right|thumb|Comparison of output wind velocities using old and new methods.]]</ins></div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>{{ADC version|version=55|relation=lt}}Before version 55, the directional wind reductions were applied by determining which of the 12 directional bins the wind velocity (at each time step) fell into, and using that roughness reduction, i.e. nearest neighbor interpolation. Starting in version 55, the roughness length is linearly (in angle space) interpolated between directional bins. In testing, this has been found to generally have a very small effect on water levels, but a notable effect on wind speeds, since time evolution of winds is smoother. It can have large localized effects on water levels in rare cases in cases where there are large changes in neighboring roughness length bins coinciding with well-aligned winds. </div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>{{ADC version|version=55|relation=lt}}Before version 55, the directional wind reductions were applied by determining which of the 12 directional bins the wind velocity (at each time step) fell into, and using that roughness reduction, i.e. nearest neighbor interpolation. Starting in version 55, the roughness length is linearly (in angle space) interpolated between directional bins. In testing, this has been found to generally have a very small effect on water levels, but a notable effect on wind speeds, since time evolution of winds is smoother. It can have large localized effects on water levels in rare cases in cases where there are large changes in neighboring roughness length bins coinciding with well-aligned winds. </div></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><del style="font-weight: bold; text-decoration: none;">[[File:WindTraceV2.png|thumb|Comparison of output wind velocities using old and new methods.]]</del></div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;"><br clear=all></ins></div></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div> </div></td><td colspan="2" class="diff-side-added"></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>====Roughness Reduction Bug Before v54====</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>====Roughness Reduction Bug Before v54====</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>{{ADC version|version=54|relation=lt}}Before version 54, there was a bug in this calculation. The mistake and its effects are addressed in this PDF document: <u><span style="color:red">'''ADD A LINK TO A PDF HERE YOOOOO'''</span></u>.</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>{{ADC version|version=54|relation=lt}}Before version 54, there was a bug in this calculation. The mistake and its effects are addressed in this PDF document: <u><span style="color:red">'''ADD A LINK TO A PDF HERE YOOOOO'''</span></u>.</div></td></tr>
</table>
Taylorgasher
https://wiki.adcirc.org/index.php?title=Wind_Stress&diff=1041&oldid=prev
Taylorgasher: /* Roughness Reductions */ added details of more old behavior and a picture
2020-07-08T16:32:01Z
<p><span dir="auto"><span class="autocomment">Roughness Reductions: </span> added details of more old behavior and a picture</span></p>
<table style="background-color: #fff; color: #202122;" data-mw="interface">
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<tr class="diff-title" lang="en">
<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">← Older revision</td>
<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 12:32, 8 July 2020</td>
</tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l23">Line 23:</td>
<td colspan="2" class="diff-lineno">Line 23:</td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>=== Older Behavior ===</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>=== Older Behavior ===</div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">====Interpolating Roughness Lengths Before v55====</ins></div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">{{ADC version|version=55|relation=lt}}Before version 55, the directional wind reductions were applied by determining which of the 12 directional bins the wind velocity (at each time step) fell into, and using that roughness reduction, i.e. nearest neighbor interpolation. Starting in version 55, the roughness length is linearly (in angle space) interpolated between directional bins. In testing, this has been found to generally have a very small effect on water levels, but a notable effect on wind speeds, since time evolution of winds is smoother. It can have large localized effects on water levels in rare cases in cases where there are large changes in neighboring roughness length bins coinciding with well-aligned winds. </ins></div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">[[File:WindTraceV2.png|thumb|Comparison of output wind velocities using old and new methods.]]</ins></div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;"></ins></div></td></tr>
<tr><td colspan="2" class="diff-side-deleted"></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">====Roughness Reduction Bug Before v54====</ins></div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>{{ADC version|version=54|relation=lt}}Before version 54, there was a bug in this calculation. The mistake and its effects are addressed in this PDF document: <u><span style="color:red">'''ADD A LINK TO A PDF HERE YOOOOO'''</span></u>.</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>{{ADC version|version=54|relation=lt}}Before version 54, there was a bug in this calculation. The mistake and its effects are addressed in this PDF document: <u><span style="color:red">'''ADD A LINK TO A PDF HERE YOOOOO'''</span></u>.</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr>
</table>
Taylorgasher
https://wiki.adcirc.org/index.php?title=Wind_Stress&diff=1039&oldid=prev
Taylorgasher: /* Older Behavior */
2020-07-08T13:59:47Z
<p><span dir="auto"><span class="autocomment">Older Behavior</span></span></p>
<table style="background-color: #fff; color: #202122;" data-mw="interface">
<col class="diff-marker" />
<col class="diff-content" />
<col class="diff-marker" />
<col class="diff-content" />
<tr class="diff-title" lang="en">
<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">← Older revision</td>
<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 09:59, 8 July 2020</td>
</tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l23">Line 23:</td>
<td colspan="2" class="diff-lineno">Line 23:</td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>=== Older Behavior ===</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>=== Older Behavior ===</div></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>{{ADC version|version=54|relation=lt}}<del style="font-weight: bold; text-decoration: none;">Note that before </del>version 54, there was a bug in this calculation. The mistake and its effects are addressed in this PDF document: <u><span style="color:red">'''ADD A LINK TO A PDF HERE YOOOOO'''</span></u>.</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>{{ADC version|version=54|relation=lt}}<ins style="font-weight: bold; text-decoration: none;">Before </ins>version 54, there was a bug in this calculation. The mistake and its effects are addressed in this PDF document: <u><span style="color:red">'''ADD A LINK TO A PDF HERE YOOOOO'''</span></u>.</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>== Converting Wind Velocity to Wind Stress ==</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>== Converting Wind Velocity to Wind Stress ==</div></td></tr>
</table>
Taylorgasher
https://wiki.adcirc.org/index.php?title=Wind_Stress&diff=1038&oldid=prev
Taylorgasher: /* Roughness Reductions */ fixed math typos
2020-07-08T13:59:28Z
<p><span dir="auto"><span class="autocomment">Roughness Reductions: </span> fixed math typos</span></p>
<table style="background-color: #fff; color: #202122;" data-mw="interface">
<col class="diff-marker" />
<col class="diff-content" />
<col class="diff-marker" />
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<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 09:59, 8 July 2020</td>
</tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l17">Line 17:</td>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>:<math>f=\left ( \frac{z_{0l}}{z_{0m}}\right ) ^{0.0706} \left ( \frac{\ln \frac{10}{z_{0l}}}{\ln \frac{10}{z_{0m}}} \right ) </math></div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>:<math>f=\left ( \frac{z_{0l}}{z_{0m}}\right ) ^{0.0706} \left ( \frac{\ln \frac{10}{z_{0l}}}{\ln \frac{10}{z_{0m}}} \right ) </math></div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>for marine roughness length <math>z_{0m}</math> and reduced ("land") roughness length <math>z_{0l}</math>. Wind speed is then reduced as, </div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>for marine roughness length <math>z_{0m}</math> and reduced ("land") roughness length <math>z_{0l}</math>. Wind speed is then reduced as, </div></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>:<math>\mathbf{w}'=f\mathbf{w}=f<del style="font-weight: bold; text-decoration: none;">\cdot </del>[u,v]</math></div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>:<math>\mathbf{w}'=f\mathbf{w}=f [u,v]</math></div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>for x- and y- wind vector components <math>u</math> and <math>v</math>. The marine roughness length is, </div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>for x- and y- wind vector components <math>u</math> and <math>v</math>. The marine roughness length is, </div></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>:<math><del style="font-weight: bold; text-decoration: none;">z</del>{0m}=\frac{0.018}{g} c_d \left \Vert \mathbf{w} \right \| </math></div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>:<math><ins style="font-weight: bold; text-decoration: none;">z_</ins>{0m}=\frac{0.018}{g} c_d \left \Vert \mathbf{w} \right \| </math></div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>for Charnock parameter <math>0.018</math>, drag coefficient <math>c_d</math> and acceleration due to gravity <math>g</math>. The wind drag coefficient is addressed below in [[#Converting Wind Velocity to Wind Stress|this section]]. As previously noted, the reduced ("land") roughness length <math>z_{0l}</math> is specified by the user via the [[Fort.13_file#Surface_Roughness|surface roughness]] nodal attribute. The fraction <math>f</math> is bounded on <math>[0,1]</math>, meaning the winds cannot be increased, nor change direction. </div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>for Charnock parameter <math>0.018</math>, drag coefficient <math>c_d</math> and acceleration due to gravity <math>g</math>. The wind drag coefficient is addressed below in [[#Converting Wind Velocity to Wind Stress|this section]]. As previously noted, the reduced ("land") roughness length <math>z_{0l}</math> is specified by the user via the [[Fort.13_file#Surface_Roughness|surface roughness]] nodal attribute. The fraction <math>f</math> is bounded on <math>[0,1]</math>, meaning the winds cannot be increased, nor change direction. </div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr>
</table>
Taylorgasher
https://wiki.adcirc.org/index.php?title=Wind_Stress&diff=1037&oldid=prev
Taylorgasher: renamed section
2020-07-08T13:57:36Z
<p>renamed section</p>
<table style="background-color: #fff; color: #202122;" data-mw="interface">
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<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">← Older revision</td>
<td colspan="2" style="background-color: #fff; color: #202122; text-align: center;">Revision as of 09:57, 8 July 2020</td>
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<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>for x- and y- wind vector components <math>u</math> and <math>v</math>. The marine roughness length is, </div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>for x- and y- wind vector components <math>u</math> and <math>v</math>. The marine roughness length is, </div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>:<math>z{0m}=\frac{0.018}{g} c_d \left \Vert \mathbf{w} \right \| </math></div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>:<math>z{0m}=\frac{0.018}{g} c_d \left \Vert \mathbf{w} \right \| </math></div></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>for Charnock parameter <math>0.018</math>, drag coefficient <math>c_d</math> and acceleration due to gravity <math>g</math>. The wind drag coefficient is addressed below in [[#Converting Wind <del style="font-weight: bold; text-decoration: none;">Speed </del>to Wind Stress|this section]]. As previously noted, the reduced ("land") roughness length <math>z_{0l}</math> is specified by the user via the [[Fort.13_file#Surface_Roughness|surface roughness]] nodal attribute. The fraction <math>f</math> is bounded on <math>[0,1]</math>, meaning the winds cannot be increased, nor change direction. </div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>for Charnock parameter <math>0.018</math>, drag coefficient <math>c_d</math> and acceleration due to gravity <math>g</math>. The wind drag coefficient is addressed below in [[#Converting Wind <ins style="font-weight: bold; text-decoration: none;">Velocity </ins>to Wind Stress|this section]]. As previously noted, the reduced ("land") roughness length <math>z_{0l}</math> is specified by the user via the [[Fort.13_file#Surface_Roughness|surface roughness]] nodal attribute. The fraction <math>f</math> is bounded on <math>[0,1]</math>, meaning the winds cannot be increased, nor change direction. </div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>=== Older Behavior ===</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>=== Older Behavior ===</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>{{ADC version|version=54|relation=lt}}Note that before version 54, there was a bug in this calculation. The mistake and its effects are addressed in this PDF document: <u><span style="color:red">'''ADD A LINK TO A PDF HERE YOOOOO'''</span></u>.</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>{{ADC version|version=54|relation=lt}}Note that before version 54, there was a bug in this calculation. The mistake and its effects are addressed in this PDF document: <u><span style="color:red">'''ADD A LINK TO A PDF HERE YOOOOO'''</span></u>.</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><br/></td></tr>
<tr><td class="diff-marker" data-marker="−"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>== Converting Wind <del style="font-weight: bold; text-decoration: none;">Speed </del>to Wind Stress ==</div></td><td class="diff-marker" data-marker="+"></td><td style="color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>== Converting Wind <ins style="font-weight: bold; text-decoration: none;">Velocity </ins>to Wind Stress ==</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>In ADCIRC, four formulations are available to convert wind speeds to the wind stresses applied in the momentum equations. Although there are several ways to control this, users are generally encouraged to use the [[metControl]] namelist in the [[fort.15]] file. The default drag formulation is the Garratt</div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div>In ADCIRC, four formulations are available to convert wind speeds to the wind stresses applied in the momentum equations. Although there are several ways to control this, users are generally encouraged to use the [[metControl]] namelist in the [[fort.15]] file. The default drag formulation is the Garratt</div></td></tr>
<tr><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><ref name=garratt1977>Garratt, J.R., 1977. Review of Drag Coefficients over Oceans and Continents. Mon. Wea. Rev. 105, 915–929. https://doi.org/10.1175/1520-0493(1977)105<0915:RODCOO>2.0.CO;2</ref></div></td><td class="diff-marker"></td><td style="background-color: #f8f9fa; color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #eaecf0; vertical-align: top; white-space: pre-wrap;"><div><ref name=garratt1977>Garratt, J.R., 1977. Review of Drag Coefficients over Oceans and Continents. Mon. Wea. Rev. 105, 915–929. https://doi.org/10.1175/1520-0493(1977)105<0915:RODCOO>2.0.CO;2</ref></div></td></tr>
</table>
Taylorgasher