AliDispersionControl - Revision history

Wpringle: /* Version */

2020-07-10T21:46:43Z

Version

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	== Version ==		== Version ==
	{{~~ADC version~~\|version=55~~: Technical Preview~~\|relation=+}}		{{Version support box\|version=55\|relation=+\|support=tp}}
	This is considered a technical preview in version 55. Theoretical work is still ongoing.		This is considered a technical preview in version 55. Theoretical work is still ongoing.

	==Controlling Dispersive Behavior==		==Controlling Dispersive Behavior==

Wpringle at 15:26, 10 July 2020

2020-07-10T15:26:45Z

← Older revision		Revision as of 11:26, 10 July 2020
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	'''Ali's Dispersion Correction''' is a correction to the dispersive behavior of very long waves in a compressible ocean on an elastic Earth. It is intended to be used in lieu of the self-attraction and loading tide prescribed through the [[fort.24 file]].		'''Ali's Dispersion Correction''' is a correction to the dispersive behavior of very long waves in a compressible ocean on an elastic Earth. It is intended to be used in lieu of the self-attraction and loading tide prescribed through the [[fort.24 file]]. It should be used with the sixth-digit of [[IM]] equal to 3 (fully implicit gravity wave term).

	== Version ==		== Version ==

Wpringle: /* Controlling Dispersive Behavior */

2020-07-10T15:24:45Z

Controlling Dispersive Behavior

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	For the following equation:		For the following equation:
	<math>Correction = 1 - Ma^2/4 - {A_d}H^{B_d}</math>		<math>Correction = 1 - \frac{Ma^2}{4} - {A_d}H^{B_d}</math>

	where Ma is the Mach number (<math>Ma = \frac{\sqrt{gH}}{Cs}</math>) and H is the total water depth.		where Ma is the Mach number (<math>Ma = \frac{\sqrt{gH}}{Cs}</math>) and H is the total water depth.

Wpringle: /* Controlling Dispersive Behavior */

2020-07-10T15:24:17Z

Controlling Dispersive Behavior

← Older revision		Revision as of 11:24, 10 July 2020
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	<math>Correction = 1 - Ma^2/4 - {A_d}H^{B_d}</math>		<math>Correction = 1 - Ma^2/4 - {A_d}H^{B_d}</math>

	where Ma is the Mach number (<math>Ma = \frac{\sqrt(gH)}{Cs}</math>) and H is the total water depth.		where Ma is the Mach number (<math>Ma = \frac{\sqrt{gH}}{Cs}</math>) and H is the total water depth.

Wpringle: /* Controlling Dispersive Behavior */

2020-07-10T15:23:59Z

Controlling Dispersive Behavior

← Older revision		Revision as of 11:23, 10 July 2020
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	* <code>Bd</code> the power law exponent.		* <code>Bd</code> the power law exponent.

	For the following ~~equations~~		For the following equation:
	<math>Correction = A_d*h^{B_d}</math>		<math>Correction = 1 - Ma^2/4 - {A_d}H^{B_d}</math>

			where Ma is the Mach number (<math>Ma = \frac{\sqrt(gH)}{Cs}</math>) and H is the total water depth.

Wpringle at 15:18, 10 July 2020

2020-07-10T15:18:28Z

← Older revision		Revision as of 11:18, 10 July 2020
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	'''~~Dynamic Water Level~~ Correction''' is a ~~process by which modeled water levels are dynamically adjusted by use of a forcing term. The~~ correction ~~can be applied as constant or varying in space and/or time. The correction is applied as a forcing term in~~ the ~~momentum equations whose mathematical form is equivalent to that~~ of an atmospheric pressure term. This means that, for gradually-varying corrections, corrected water levels should closely follow the input correction, though these may deviate if a correction is applied very ~~quickly or to an area that has~~ a ~~very weak connection to~~ an ~~open boundary through which water can flow~~. ~~Further discussion~~ is ~~below~~ in the [[~~#FAQ\|FAQ]].~~		'''Ali's Dispersion Correction''' is a correction to the dispersive behavior of very long waves in a compressible ocean on an elastic Earth. It is intended to be used in lieu of the self-attraction and loading tide prescribed through the [[fort.24 file]].

	Overviews and examples of this capability have been provided in multiple presentations (Luettich et al. 2017<ref name="luettichPres2017">Luettich, R.L., T.G. Asher, B.O. Blanton, J.G. Fleming. Representing Low Frequency, Spatially Varying Water Level Anomalies in Storm Surge Computations. 2017 American Meteorological Society Annual Meeting. [https://ams.~~confex.com/ams/97Annual/webprogram/Paper316033.html Link to talk~~]</ref>, Asher et al. 2018<ref name="asherPres2018">Asher, T.G., R.L. Luettich, J.G. Fleming, B.O.Blanton. Assimilation of Observed Water Levels into Storm Surge Model Predictions. 2018 American Meteorological Society Annual Meeting. [https://ams.confex.com/ams/98Annual/webprogram/Paper334044.html Link to talk]</ref>) and a journal article (Asher et al. 2019<ref name="asher2019">Asher, T.G., Luettich Jr., R.A., Fleming, J.G., Blanton, B.O., 2019. Low frequency water level correction in storm surge models using data assimilation. Ocean Modelling 144, 101483. https://doi.org/10.1016/j.ocemod.2019.101483</ref>) with details and an application to Hurricane Matthew. Users looking for ways to generate water level correction surfaces can look to that same article and this digital publication/data repository<ref>Asher, T., 2019. Hurricane Matthew (2016) Storm Surge and Wave Simulations with Data Assimilation. https://doi.org/10.17603/2Z8H-7K90</ref>, which holds the code base used in the aforementioned paper.

	== Version ==		== Version ==
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	* <code>Ad</code> the power law constant.		* <code>Ad</code> the power law constant.
	* <code>Bd</code> the power law exponent.		* <code>Bd</code> the power law exponent.

			For the following equations
			<math>Correction = A_d*h^{B_d}</math>

Wpringle: /* Controlling Dispersive Behavior */

2020-07-10T15:07:53Z

Controlling Dispersive Behavior

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	==Controlling Dispersive Behavior==		==Controlling Dispersive Behavior==
	The feature is triggered by the presence of the &AliDispersionControl namelist at the bottom of the [[fort.15 file]]. Here is an example of how this line is used:<br/>		The feature is triggered by the presence of the &AliDispersionControl namelist at the bottom of the [[fort.15 file]]. Here is an example of how this line is used (the following floats are the default values):<br/>
	<code>&AliDispersionControl CAliDisp=T, Cs=1500.0, Ad = 0.0050189, Bd = 0.23394/</code>		<code>&AliDispersionControl CAliDisp=T, Cs=1500.0, Ad = 0.0050189, Bd = 0.23394/</code>

Wpringle: /* Controlling Dispersive Behavior */

2020-07-10T15:04:58Z

Controlling Dispersive Behavior

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	* <code>CAliDisp</code> logical flag to turn Ali's dispersion correction on (F=false by default).		* <code>CAliDisp</code> logical flag to turn Ali's dispersion correction on (F=false by default).
	* <code>Cs</code> is the speed of sound in water [m/s] for the Mach number based dispersive correction. Set Cs to a negative value to turn ~~this component~~ off.		* <code>Cs</code> is the speed of sound in water [m/s] for the Mach number based dispersive correction. Set Cs to a negative value to turn the Mach number based correction off.
	* <code>Ad</code> the power law constant.		* <code>Ad</code> the power law constant.
	* <code>Bd</code> the power law exponent.		* <code>Bd</code> the power law exponent.

Wpringle: /* Controlling Dispersive Behavior */

2020-07-10T15:04:02Z

Controlling Dispersive Behavior

← Older revision		Revision as of 11:04, 10 July 2020
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	* <code>CAliDisp</code> logical flag to turn Ali's dispersion correction on (F=false by default).		* <code>CAliDisp</code> logical flag to turn Ali's dispersion correction on (F=false by default).
	* <code>Cs</code> is the speed of sound in water [m/s] for the Mach number based dispersive correction. Set Cs to a negative value to turn this component off.		* <code>Cs</code> is the speed of sound in water [m/s] for the Mach number based dispersive correction. Set Cs to a negative value to turn this component off.
	* <code>Ad</code> ~~coefficient~~.		* <code>Ad</code> the power law constant.
	* <code>Bd</code> ~~coefficient~~.		* <code>Bd</code> the power law exponent.

Wpringle: Created page with "'''Dynamic Water Level Correction''' is a process by which modeled water levels are dynamically adjusted by use of a forcing term. The correction can be applied as constant o..."

2020-07-10T15:02:04Z

Created page with "'''Dynamic Water Level Correction''' is a process by which modeled water levels are dynamically adjusted by use of a forcing term. The correction can be applied as constant o..."

New page

'''Dynamic Water Level Correction''' is a process by which modeled water levels are dynamically adjusted by use of a forcing term. The correction can be applied as constant or varying in space and/or time. The correction is applied as a forcing term in the momentum equations whose mathematical form is equivalent to that of an atmospheric pressure term. This means that, for gradually-varying corrections, corrected water levels should closely follow the input correction, though these may deviate if a correction is applied very quickly or to an area that has a very weak connection to an open boundary through which water can flow. Further discussion is below in the [[#FAQ|FAQ]].

Overviews and examples of this capability have been provided in multiple presentations (Luettich et al. 2017<ref name="luettichPres2017">Luettich, R.L., T.G. Asher, B.O. Blanton, J.G. Fleming. Representing Low Frequency, Spatially Varying Water Level Anomalies in Storm Surge Computations. 2017 American Meteorological Society Annual Meeting. [https://ams.confex.com/ams/97Annual/webprogram/Paper316033.html Link to talk]</ref>, Asher et al. 2018<ref name="asherPres2018">Asher, T.G., R.L. Luettich, J.G. Fleming, B.O.Blanton. Assimilation of Observed Water Levels into Storm Surge Model Predictions. 2018 American Meteorological Society Annual Meeting. [https://ams.confex.com/ams/98Annual/webprogram/Paper334044.html Link to talk]</ref>) and a journal article (Asher et al. 2019<ref name="asher2019">Asher, T.G., Luettich Jr., R.A., Fleming, J.G., Blanton, B.O., 2019. Low frequency water level correction in storm surge models using data assimilation. Ocean Modelling 144, 101483. https://doi.org/10.1016/j.ocemod.2019.101483</ref>) with details and an application to Hurricane Matthew. Users looking for ways to generate water level correction surfaces can look to that same article and this digital publication/data repository<ref>Asher, T., 2019. Hurricane Matthew (2016) Storm Surge and Wave Simulations with Data Assimilation. https://doi.org/10.17603/2Z8H-7K90</ref>, which holds the code base used in the aforementioned paper.

== Version ==
{{ADC version|version=55: Technical Preview|relation=+}}
This is considered a technical preview in version 55. Theoretical work is still ongoing.

==Controlling Dispersive Behavior==
The feature is triggered by the presence of the &AliDispersionControl namelist at the bottom of the [[fort.15 file]]. Here is an example of how this line is used:<br/>
<code>&AliDispersionControl CAliDisp=T, Cs=1500.0, Ad = 0.0050189, Bd = 0.23394/</code>

* <code>CAliDisp</code> logical flag to turn Ali's dispersion correction on (F=false by default).
* <code>Cs</code> is the speed of sound in water [m/s] for the Mach number based dispersive correction. Set Cs to a negative value to turn this component off.
* <code>Ad</code> coefficient.
* <code>Bd</code> coefficient.