source: issm/trunk/src/m/materials/DepthAvgTempCond.py@ 17989

Last change on this file since 17989 was 17989, checked in by Mathieu Morlighem, 11 years ago

merged trunk-jpl and trunk for revision 17986
File size: 931 bytes
Line 
1import numpy as npy
2from TMeltingPoint import TMeltingPoint
3
4def DepthAvgTempCond(md):
5 ''' compute conduction dependent temperature profile for an ice sheet.
6 Usage:
7 Tbar=DepthAvgTempCond(md)
8 '''
9
10 Tpmp=TMeltingPoint(md.materials.meltingpoint,0) #pressure melting point at 0 pressure.
11
12 k=md.materials.thermalconductivity
13 G=md.basalforcings.geothermalflux
14 H=md.geometry.thickness[:,0]
15 Ts=md.initialization.temperature
16 alpha=G*H/k
17
18 Tbar=npy.zeros(md.mesh.numberofvertices,)
19
20 #find temperature average when we are below melting point:
21 pos=npy.nonzero( Ts+alpha < Tpmp)
22 if pos:
23 Tbar[pos]=Ts[pos]+alpha[pos]/2
24
25 pos=npy.nonzero( Ts+alpha>= Tpmp)
26 if pos:
27 Tbar[pos]=Tpmp+(Tpmp**2-Ts[pos]**2)/2/alpha[pos]+ Tpmp*(Ts[pos]-Tpmp)/alpha[pos]
28
29 #on ice shelf, easier:
30 pos=npy.nonzero(md.mask.groundedice_levelset[0]<=0)
31 if pos:
32 Tbar[pos]=(Ts[pos]+Tpmp)/2
33
34 return Tbar
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