Wave-current Interaction (WEC) in the COAWST Modeling System Nirnimesh Kumar, SIO with J.C. Warner, G. Voulgaris, M. Olabarrieta *see Kumar et al., 2012 (might be in your booklet) Implementation of the vortex force formalism in the coupled ocean-atmosphere-wave-sediment transport (COAWST) modeling system for inner shelf and surf zone applications, Ocean Modelling, Volume 47, 2012, Pages 65- 95. *also see Olabarrieta et al., 2012
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Wave-current Interaction (WEC) in the COAWST Modeling System Nirnimesh Kumar, SIO with J.C. Warner, G. Voulgaris, M. Olabarrieta *see Kumar et al., 2012.
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Wave-current Interaction (WEC) in the COAWST Modeling System
Nirnimesh Kumar, SIOwith J.C. Warner, G. Voulgaris, M. Olabarrieta
*see Kumar et al., 2012 (might be in your booklet) Implementation of the vortex force formalism in the coupled ocean-atmosphere-wave-sediment transport (COAWST) modeling system for inner shelf and surf zone applications, Ocean Modelling, Volume 47, 2012, Pages 65-95.*also see Olabarrieta et al., 2012
cppdefs.h (COAWST/ROMS/Include)WEC_MELLOR+ Activates the Mellor (2011) method for WEC
WEC_VF(preferred method for 3D)
Activate WEC using the Vortex Force formalism (Uchiyama et al., 2010)
Wave-current Interaction (WEC)
WEC_MELLOR(Mellor, 2011)
WEC_VF(Uchiyama et al., 10)
+ Roller Model+ Streaming
+ Dissipation (depth)+ Roller Model + Wave mixing + Streaming
Implemented in Kumar et al., 2011
Implemented in Kumar et al., 2012
*Processes in italics are optional
Dissipation (Depth-limited wave breaking)WDISS_THORGUZA Wave dissipation based on Thornton and Guza (1983).
See Eqn. (31), pg-71
WDISS_CHURTHOR Wave dissipation based on Church and Thornton (1993). See Eqn. (32), pg-71
WDISS_WAVEMODActivate wave-dissipation from a wave model. If using SWAN wave model, use INRHOG=1 for correct units of wave dissipation
Note: (a) Use WDISS_THORGUZA/CHURTHOR if no information about wave dissipation is
present, and you canβt run the wave model to obtain depth-limited dissipation
(b)If you do not define any of these options, and still define WEC_VF, the model expects a forcing file with information about dissipation
ROLLER MODEL (for Wave Rollers)ROLLER_SVENDSEN Wave roller based on Svendsen (1984). See Warner et al.
(2008), Eqn. 7 and Eqn. 10.
ROLLLER_MONO Wave roller for monochromatic waves from REF-DIF. See Haas and Warner, 2009.
ROLLER_RENIERS Activate wave roller based on Reniers et al. (2004). See Eqn. 34-37 (Advection-Diffusion)
Note: If defining ROLLER_RENIERS, you must specify the parameter
wec_alpha (Ξ±r in Eqn. 34, varying from 0-1) in the INPUT file. Here 0 means no percentage of wave dissipation goes into creating wave rollers, while 1 means all the wave dissipation creates wave rollers.
Wave breaking induced mixing
TKE_WAVEDISSZOS_HSIG
β’ Enhanced vertical mixing from waves within framework of GLS. See Eq. 44, 46 and 47. Based on Feddersen and Trowbridge, 05
β’ The parameter Ξ±w in Eq. 46 can be specified in the INPUT file as ZOS_HSIG_ALPHA (roughness from wave amplitude)
β’ Parameter Cew in Eqn. 47 is specified in the INPUT file as SZ_ALPHA (roughness from wave dissipation)
Bottom and Surface Streaming
BOTTOM_STREAMINGBottom streaming due to waves using Uchiyama et al. (2010) methodology. See Eqn. 22-26. This method requires dissipation due to bottom friction. If not using a wave model, then uses empirical Eq. 22.
BOTTOM_STREAMING_XU_BOWEN
Bottom streaming due to waves based on methodology of Xu and Bowen, 1994. See Eq. 27.
SURFACE_STREAMING Surface streaming using Xu and Bowen, 1994. See Eq. 28.
Note: (a) BOTTOM_STREAMING_XU_BOWEN was tested in Kumar et al. (2012). It requires
very high resolution close to bottom layer. Suggested Vtransform=2 and Vstretching=3
[0,0]
[1000,-12]
z
x
y
Hsig= 2mTp = 10sΞΈ = 10o
Shoreface Test Case (Obliquely incident waves on a planar beach)
Wave field computed using SWAN One way coupling (only WEC) Application Name: SHOREFACE Header file: COAWST/ROMS/Include/shoreface.h Input file: COAWST/ROMS/External/ocean_shoreface.in
Header File (COAWST/ROMS/Include)
Input File (COAWST/ROMS/External)
Input File (COAWST/ROMS/External)
Requires a wave forcing fileas one way coupling only
Forcing file for one way coupling Data/ROMS/Forcing/swan_shoreface_angle_forc.nc
Should contain the following variables
Wave Height Hwave
Wave Direction Dwave
Wave Length Lwave
Bottom Orbital Vel. Ub_Swan
Depth-limited breaking Dissip_break
Whitecapping induced breaking Dissip_wcap
Bottom friction induced dissip. Dissip_fric
Time Period Pwave_top/Pwave_bot
WEC Related Output
Results (I of III)Significant Wave Height
Sea surface elevation
Results (II of III)Depth-averaged Velocities
Cross-shore Vel. Longshore Vel.
Results (III of III)
Cross-shore
Longshore
Vertical
Eulerian Stokes
WEC related Diagnostics Terms(i.e., contribution to momentum balance)Terms in momentum balance Definition Output