CMS-Flow Wind Forcing: Difference between revisions

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=Spatially Variable Wind and Atmospheric Pressure=
=Spatially Variable Wind and Atmospheric Pressure=
CMS-Flow  V4.0 and higher have the option to use spatially variable wind and  atmospheric pressure forcing. Currently, this feature is specified in  the advanced card section using the cards listed in the table below.
CMS-Flow  V4.0 and higher have the option to use spatially variable wind and  atmospheric pressure forcing. Currently, this feature is specified in  the advanced card section.


* Notes:
:'''Interpolation File''': When  using spatially variable winds CMS V4.0 will output a file named  ''Intpcoef_wndfl.bin''. This file contains the coefficients used to  interpolate the winds and atmospheric pressure to the CMS-Flow grid. If  the same flow and wind grids are run, the model will automatically  detect the interpolation file and read in the coefficients instead of  calculating them. If the either grid is changed in size, the model will  automatically detect this and recalculate the coefficients. However, if  the grids are changed but stay the same size, the model will not be able  to detect that they have changed. Therefore, whenever any changes are  made to the flow or wind grids, it is best to delete the interpolation  file.
:'''Ramp Period''': During the ramp period, the  ramp is applied to both the wind shear stresses and spatial variations  of the atmospheric pressure.
== Oceanweather Format ==
'''CMS-Flow cards related to wind'''
{| border="1"
! Card  !! Arguments !! Type
|-
| WIND_OUT_TIMES_LIST || Id number  of output times list || integer
|-
| WIND_DRAG_COEFFICIENT  || kappa in Hsu (1988) (default 0.4) || real
|-
|  WIND_INPUT_CURVE ||  Name of model parameter file followed wind curve  path || character
|-
| ANEMOMETER_HEIGHT || Height of wind  speeds || meter
|-
| [[OCEANWEATHER_WIND_FILE]] || Name of  Oceanweather, Inc. wind file (*.win) || character
|-
|  [[OCEANWEATHER_PRES_FILE]] ||  Name of Oceanweather, Inc. pressure file  (*.pre) || character
|-
| [[OCEANWEATHER_XY_FILE]] ||  Name  of Oceanweather, Inc. coordinate file (*.xy) || character
|}
== Single ASCII File ==
This file format is equivalent to the ADCIRC fort.22 format with NWS=6. The winds and atmospheric pressure are specified on a rectangular grid in the same coordinate system and projection as the CMS. The grid is assumed to vary from north to south and west to east so that north-west corner is the grid origin. The spatial extents of the wind/pressure grid must be consistent with the flow grid.
   
'''CMS-Flow cards related to wind'''
'''CMS-Flow cards related to wind'''
{| border="1"
{| border="1"
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| ANEMOMETER_HEIGHT || Height of wind speeds || meter
| ANEMOMETER_HEIGHT || Height of wind speeds || meter
|-
|-
| [[OCEANWEATHER_WIND_FILE]] || Name of Oceanweather, Inc. wind file (*.win) || character
| WIND_PRESSURE_SINGLE_FILE ||  Name of fleet wind and pressure file || character
|-
| [[OCEANWEATHER_PRES_FILE]] ||  Name of Oceanweather, Inc. pressure file (*.pre) || character
|-
| [[OCEANWEATHER_XY_FILE]] ||  Name of Oceanweather, Inc. coordinate file (*.xy) || character
|-
| WIND_PRESSURE_FLEET_FILE ||  Name of fleet wind and pressure file || character
|-
|-
| WIND_PRESSURE_GRID_PARAM ||  Nwlat,Nwlon,wLatMax,wLonMin,wLatInc,wLonInc || integer and real
| WIND_PRESSURE_GRID_PARAM ||  Nwlat,Nwlon,wLatMax,wLonMin,wLatInc,wLonInc || integer and real
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|}
|}


* Notes:
 
:'''Interpolation File''': When using spatially variable winds CMS V4.0 will output a file named ''Intpcoef_wndfl.bin''. This file contains the coefficients used to interpolate the winds and atmospheric pressure to the CMS-Flow grid. If the same flow and wind grids are run, the model will automatically detect the interpolation file and read in the coefficients instead of calculating them. If the either grid is changed in size, the model will automatically detect this and recalculate the coefficients. However, if the grids are changed but stay the same size, the model will not be able to detect that they have changed. Therefore, whenever any changes are made to the flow or wind grids, it is best to delete the interpolation file.
:'''Ramp Period''': During the ramp period, the ramp is applied to both the wind shear stresses and spatial variations of the atmospheric pressure.


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[[CMS#Documentation Portal | Documentation Portal]]
[[CMS#Documentation Portal | Documentation Portal]]

Revision as of 19:26, 24 January 2011

Wind Curve

SMS 10.1
SMS 10.1

Temporally varying, spatially constant winds are input in CMS in the Wind Section of the CMS-Flow Model Control Window. To add wind forcing to a current CMS-Flow project click on CMS-Flow | Model Control and then on the Wind/Wave tab. Activate wind forcing by clicking on the Include Wind check box. Winds may be imported using an *.m2w file or by specifying a curve for wind speed and direction. To specify a curve for each click on the respective box which says Curve undefined which will open the XY Series Editor. The time series may be manually entered, copied or imported from an *.xys file in the XY Series Editor.


Spatially Variable Wind and Atmospheric Pressure

CMS-Flow V4.0 and higher have the option to use spatially variable wind and atmospheric pressure forcing. Currently, this feature is specified in the advanced card section.

  • Notes:
Interpolation File: When using spatially variable winds CMS V4.0 will output a file named Intpcoef_wndfl.bin. This file contains the coefficients used to interpolate the winds and atmospheric pressure to the CMS-Flow grid. If the same flow and wind grids are run, the model will automatically detect the interpolation file and read in the coefficients instead of calculating them. If the either grid is changed in size, the model will automatically detect this and recalculate the coefficients. However, if the grids are changed but stay the same size, the model will not be able to detect that they have changed. Therefore, whenever any changes are made to the flow or wind grids, it is best to delete the interpolation file.
Ramp Period: During the ramp period, the ramp is applied to both the wind shear stresses and spatial variations of the atmospheric pressure.

Oceanweather Format

CMS-Flow cards related to wind

Card Arguments Type
WIND_OUT_TIMES_LIST Id number of output times list integer
WIND_DRAG_COEFFICIENT kappa in Hsu (1988) (default 0.4) real
WIND_INPUT_CURVE Name of model parameter file followed wind curve path character
ANEMOMETER_HEIGHT Height of wind speeds meter
OCEANWEATHER_WIND_FILE Name of Oceanweather, Inc. wind file (*.win) character
OCEANWEATHER_PRES_FILE Name of Oceanweather, Inc. pressure file (*.pre) character
OCEANWEATHER_XY_FILE Name of Oceanweather, Inc. coordinate file (*.xy) character

Single ASCII File

This file format is equivalent to the ADCIRC fort.22 format with NWS=6. The winds and atmospheric pressure are specified on a rectangular grid in the same coordinate system and projection as the CMS. The grid is assumed to vary from north to south and west to east so that north-west corner is the grid origin. The spatial extents of the wind/pressure grid must be consistent with the flow grid.

CMS-Flow cards related to wind

Card Arguments Type
WIND_OUT_TIMES_LIST Id number of output times list integer
WIND_DRAG_COEFFICIENT kappa in Hsu (1988) (default 0.4) real
WIND_INPUT_CURVE Name of model parameter file followed wind curve path character
ANEMOMETER_HEIGHT Height of wind speeds meter
WIND_PRESSURE_SINGLE_FILE Name of fleet wind and pressure file character
WIND_PRESSURE_GRID_PARAM Nwlat,Nwlon,wLatMax,wLonMin,wLatInc,wLonInc integer and real
WIND_PRESSURE_TIME_INCREMENT wTimeInc real


Documentation Portal

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