6.6. Flow law¶
Several options for the flow law of polycrystalline ice are available. They can be selected by the parameter
FLOW_LAW in the run-specs headers:
3: Flow law by Durham et al.  with stress exponent \(n=4\).
For the cases
FLOW_LAW = 1, 2 or 3, the additional parameter
FIN_VISC allows choosing between the unmodified flow law with an infinite-viscosity limit for low strain rates (
FIN_VISC = 1), or using a regularized flow law with a finite-viscosity limit (
FIN_VISC = 2). The latter is defined by a non-vanishing residual stress \(\sigma_0\) (parameter
SIGMA_RES; see Greve and Blatter , Section 4.3.2).
The rate factor \(A(T')\) must fit the flow law unit- and value-wise. It is defined in the physical-parameter files as a list for integer temperature values (between which linear interpolation is applied).