HPGE at sea cliff

General scientific issues regarding ROMS

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cyltby
Posts: 2
Joined: Fri Jul 05, 2019 10:08 pm
Location: SYSU

HPGE at sea cliff

#1 Unread post by cyltby »

Hi all,

I run the HPGE(Horizontal Pressure Gradient Error) test: 1)without any forcing; 2)closed boundaries; 3)initial Temparature of stable stratification, and constant Salinity; 4)10 days simulation.

The running log attacehd as runningfile.txt. The bottom velocity maganitude of final snapshot is shown as Fig1(unit m/s). It seem OK at shelf region with HPGE ~0.01 m/s(shown as Fig2). However, It ocurrence ~0.4 m/s at the bottom of the sea cliff(Fig3). As I plan to do a ten years simulation, the HPGE will be the problem.

I tried to use 1) different topography data(e.g. etopo1 etopo5 gebco_2014),
2) different stretching (theta_s theta_b hc), actually the RX1 will change but the HPGE not at the sea cliff
3) different smoonthing function(GRID_SmoothPositive_rx0, GRID_SmoothNegative_rx0, GRID_LinProgHeuristic_rx0 )
4) different horizontal mixing cofficient( VIS2 = 0,100,1000), it did work slightly.

How can I controll the HPGE at that sea cliff?

Thanks,
Yong
Attachments
Fig3-sea_cliff_section.png
Fig3-sea_cliff_section.png (211.45 KiB) Viewed 920 times
Fig2-shelf _section.png
Fig2-shelf _section.png (135.13 KiB) Viewed 920 times
Fig1-Bottom_Vel.png
Fig1-Bottom_Vel.png (152.72 KiB) Viewed 920 times
runningfile.txt
(493.75 KiB) Downloaded 153 times

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