[MITgcm-support] very large velocity near the land boundary

[Chun-Yan Zhou]

Hi all, 
I use a realistic topography in order to study the tidal effect. I have smoothed the topography a lot, and add the barotropical tidal velocity (velocity magnitude=0.2m/s ) in the east boundary. But I got very large velocity near the land boundary (up to 8m/s). I then reduced the minimum water depth to 10m, still got the similar problem. I don't know how to deal with the land boundary. The data is attached. Any suggestion is much appreciated! 
    
# ==================== 
# | Model parameters | 
# ==================== 
# 
# Continuous equation parameters 
 &PARM01 
 viscAh=1.E2, 
 viscAz=1.E-3, 
 no_slip_sides=.FALSE., 
 no_slip_bottom=.FALSE., 
 diffKhT=1.E2, 
 diffKzT=1.E-3, 
 diffKhS=0.E2, 
 diffKzS=0.E-5, 
 tAlpha=2.E-4, 
 sBeta =0., 
 omega=0., 
 gravity=9.81, 
 eosType='LINEAR', 
 tempStepping=.TRUE., 
 rigidLid=.FALSE., 
 implicitFreeSurface=.TRUE., 
 readBinaryPrec=64, 
 writeBinaryPrec=64, 
 metricTerms=.FALSE., 
 hFacMin=0.5, 
 exactConserv=.TRUE., 
 & 

# Elliptic solver parameters 
 &PARM02 
 cg2dMaxIters=1000, 
 cg2dTargetResidual=1.E-13, 
 & 

# Time stepping parameters 
 &PARM03 
 startTime=0., 
 endTime=44714., 
 deltaT=44.714, 
 cAdjFreq=0., 
 abEps=0.02, 
 pChkptFreq=0.0, 
 chkptFreq=0.0, 
#dumpFreq=7200.0, 
 dumpFreq=447.14, 
#taveFreq=86400.0, 
 monitorFreq=3600., 
 periodicExternalForcing=.TRUE., 
 externForcingPeriod=447.14, 
 externForcingCycle=44714., 
 & 

# Gridding parameters 
 &PARM04 
 usingSphericalPolarGrid=.TRUE., 
 delX=108*0.1, 
 delY=140*0.1, 
 delZ=10*3.,10*7.,20*25., 
 ygOrigin=27.1, 
 & 

# Input datasets 
 &PARM05 
bathyFile='topog.slope', 
hydrogThetaFile='T.init', 
 & 


# Open-boundaries 
 &OBCS_PARM01 
 OB_Ieast=140*-1, 
 OB_Jsouth=108*1, 
 useOrlanskiEast=.TRUE., 
 useOrlanskiSouth=.TRUE.,  
 useOBCSprescribe=.TRUE.,  
 OBEuFile = 'OBEU.bin', 
 & 
# Orlanski parameters 
 &OBCS_PARM02 
 Cmax=0.45, 
 cVelTimeScale=1000., 
 & 

Chunyan Zhou
Division of Civil Engineering
School of Engineering, Physics and Mathematics
College of Art, Science and Engineering
Fulton Building
University of Dundee
Dundee DD1 4HN



The University of Dundee is a registered Scottish charity, No: SC015096
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