--- Welcome to the official ADCIRCWiki site! The site is currently under construction, with limited information. ---
For general information, see the ADCIRC site, ADCIRC FAQ, or the ADCIRC Wikipedia page. For model documentation not yet available on the wiki, see the ADCIRC site. New content is being continuously added to the ADCIRCWiki, and material from the main ADCIRC site will be gradually transitioned over to the wiki.

Difference between revisions of "AliDispersionControl"

From ADCIRCWiki
Jump to: navigation, search
(Controlling Dispersive Behavior)
Line 1: Line 1:
'''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 ==

Revision as of 15:26, 10 July 2020

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

ADCIRC version: 55: Technical Preview

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 (the following floats are the default values):
&AliDispersionControl CAliDisp=T, Cs=1500.0, Ad = 0.0050189, Bd = 0.23394/

  • CAliDisp logical flag to turn Ali's dispersion correction on (F=false by default).
  • Cs 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.
  • Ad the power law constant.
  • Bd the power law exponent.

For the following equation:

where Ma is the Mach number () and H is the total water depth.