Add RESET_INTXPA_INTEGRAL_FLATTEST option to pressure gradient
#843
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This new parameter RESET_INTXPA_INTEGRAL_FLATTEST modifies the reference interface for the horizontal pressure integrals in the finite volume pressure gradient force calculation. If true, in ocean columns where no non-tilted, non-vanished layer can be found (e.g. near specific shaped ice shelf grounding lines), rather than using the top surface to integrate downwards as the reference, the code finds and chooses the flattest (i.e. minimum difference between depth or pressure) interface as the reference. The parameter defaults to False therefore should not change default answers. However, if true, combined with other ice shelf code changes e.g. MASS_WEIGHT_IN_PGF_VANISHED_ONLY = True, RESET_INTXPA_INTEGRAL = True, MASS_WEIGHT_IN_PRESSURE_GRADIENT = True and MASS_WEIGHT_IN_PRESSURE_GRADIENT_TOP = True + initialisation code fixes I get very low spurious currents in the Boussinesq ZSTAR and SIGMA_SHELF_ZSTAR ISOMIP+ test cases.
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This new parameter
RESET_INTXPA_INTEGRAL_FLATTESTmodifies the reference interface for the horizontal pressure integrals in the finite volume pressure gradient force calculation. If true, in ocean columns where no non-tilted, non-vanished layer can be found (e.g. near specific shaped ice shelf grounding lines), rather than using the top surface to integrate downwards as the reference, the code finds and chooses the flattest (i.e. minimum difference between depth or pressure) interface as the reference.The parameter defaults to False therefore should not change default answers. However, if true, combined with other ice shelf code changes e.g.
MASS_WEIGHT_IN_PGF_VANISHED_ONLY= True,RESET_INTXPA_INTEGRAL= True,MASS_WEIGHT_IN_PRESSURE_GRADIENT= True andMASS_WEIGHT_IN_PRESSURE_GRADIENT_TOP= True + initialisation code fixes I get very low spurious currents in the Boussinesq ZSTAR and SIGMA_SHELF_ZSTAR ISOMIP+ test cases (note non-Boussinesq still not quiet).This is an alternative to the inconsistent and slow, closed PR #811