| 1 |
% This is a matlab script that generates the input data |
| 2 |
|
| 3 |
% the configuation approximately the ISOMIP experiment no. 1 |
| 4 |
% require matlab functions for equation of state |
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|
| 6 |
% Dimensions of grid |
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nx=50; nxi=20; |
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ny=100; nyi=[51:100]; |
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nz=30; |
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deltaZ = 30; |
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|
| 12 |
dlat = 0.1; dy=6.4e6*dlat./pi; |
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dlon = 0.3; dx=dlon; |
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|
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%eos = 'linear'; |
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eos = 'jmd95z'; |
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%eos = 'mdjwf'; |
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|
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acc = 'real*8'; |
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|
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long = [0:dlon:10-dlon]; |
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lonc = long+dlon/2; |
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latg = [-80:dlat:-70-dlat]; |
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latc = latg+dlat/2; |
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|
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% Nominal depth of model (meters) |
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H = -900; |
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Hmin = -700; % deepest point of cavern |
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Hmax = -200; % shallowest point of cavern |
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dHdx = (Hmax-Hmin)/4; |
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|
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bathy = ones(nx,ny)*H; |
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bathy(1,:) = 0; |
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bathy(:,1) = 0; |
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%fid=fopen('bathy.box','w','b'); fwrite(fid,bathy,acc);fclose(fid); |
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|
| 37 |
|
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dz = deltaZ*ones(1,nz); |
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zgp1 = [0,cumsum(dz)]; |
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zc = .5*(zgp1(1:end-1)+zgp1(2:end)); |
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zg = zgp1(1:end-1); |
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dz = diff(zgp1); |
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sprintf('delZ = %d * %7.6g,',nz,dz) |
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|
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% Gravity |
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gravity=9.81; |
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rhoConst = 1030; |
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% compute potential field underneath ice shelf |
| 49 |
talpha = 2e-4; |
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sbeta = 7.4e-4; |
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tref = -1.9*ones(nz,1); |
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t = tref; |
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sref = 34.4*ones(nz,1); |
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s = sref; |
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gravity = 9.81; |
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k=1; |
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dzm = abs([zg(1)-zc(1) .5*diff(zc)]); |
| 58 |
dzp = abs([.5*diff(zc) zc(end)-zg(end)]); |
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p = abs(zc)*gravity*rhoConst*1e-4; |
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dp = p; |
| 61 |
kp = 0; |
| 62 |
while std(dp) > 1e-13 |
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phiHydF(k) = 0; |
| 64 |
p0 = p; |
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kp = kp+1 |
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for k = 1:nz |
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switch eos |
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case 'linear' |
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drho = rhoConst*(1-talpha*(t(k)-tref(k))+sbeta*(s(k)-sref(k)))-rhoConst; |
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case 'jmd95z' |
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drho = densjmd95(s(k),t(k),p(k))-rhoConst; |
| 72 |
case 'mdjwf' |
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drho = densmdjwf(s(k),t(k),p(k))-rhoConst; |
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otherwise |
| 75 |
error(sprintf('unknown EOS: %s',eos)) |
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end |
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phiHydC(k) = phiHydF(k) + dzm(k)*gravity*drho/rhoConst; |
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phiHydF(k+1) = phiHydC(k) + dzp(k)*gravity*drho/rhoConst; |
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end |
| 80 |
switch eos |
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case 'mdjwf' |
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p = (gravity*rhoConst*abs(zc) + phiHydC*rhoConst)/gravity/rhoConst; |
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end |
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dp = p-p0; |
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end |
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|
| 87 |
icetopo = ones(nx,1)*min(Hmax,Hmin + dHdx*(latc-latg(1))); |
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icetopo(:,nyi)=0; |
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fid=fopen('icetopo.exp1','w','b'); fwrite(fid,icetopo,acc);fclose(fid); |
| 90 |
frontdepth=zeros(nx,ny);frontdepth(:,nyi(1))=-icetopo(:,nyi(1)-1); |
| 91 |
fid=fopen('frontdepth.xuyun','w','b'); fwrite(fid,frontdepth,acc);fclose(fid); |
| 92 |
frontcircum=zeros(nx,ny); |
| 93 |
frontcircum(:,nyi(1))=deltaZ./dy; |
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fid=fopen('frontcircum.xuyun','w','b'); fwrite(fid,frontcircum,acc);fclose(fid); |
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|
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% After modifying the code in calc_phi_hyd.F on Apr26,2012 this is the |
| 97 |
% consistent way of computing phi0surf. For this, we need the grid |
| 98 |
% information (hFacC's). For convenience, it's taken from a previous model |
| 99 |
% run. |
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% |
| 101 |
% The way of computing phi0surf consistent with code prior to Apr26,2012 |
| 102 |
% is recovered by setting drloc*dphi=0 |
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hf=rdmds('../tr_run.icefront/hFacC'); |
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msk=sum(hf,3); msk(msk>0)=1; |
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phi0surf = zeros(nx,ny); |
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for ix=1:nx |
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for iy=1:ny |
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k=max(find(abs(zg)<abs(icetopo(ix,iy)))); |
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if isempty(k) |
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k=0; |
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end |
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if k>0 |
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kp1=min(k+1,nz); |
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drloc=1-hf(ix,iy,k); |
| 115 |
%drloc=(abs(icetopo(ix,iy))-abs(zg(k)))/dz(k); |
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dphi = phiHydF(kp1)-phiHydF(k); |
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phi0surf(ix,iy) = (phiHydF(k)+drloc*dphi)*rhoConst*msk(ix,iy); |
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end |
| 119 |
end |
| 120 |
end |
| 121 |
fid=fopen(['phi0surf.exp1.' eos],'w','b'); fwrite(fid,phi0surf,acc);fclose(fid); |
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