The subglacier

This section describes how to control PISM’s sub-models of subglacial processes: the basal strength, the subglacial hydrology, and bed deformation.

Two of these sections (Controlling basal strength and Parameterization of bed roughness) can be thought of as parts of PISM’s stress balance model: they cover PISM’s treatment of basal boundary conditions: the former for stress balance models including longitudinal stresses, and the latter for the non-sliding SIA flow.

• Controlling basal strength
  • Choosing the sliding law
    • Lateral drag
  • Determining the yield stress
    • Till friction angle heuristic
    • Till friction angle optimization
  • Determining the effective pressure
    • Controlling minimum effective pressure
• Subglacial hydrology
  • The default model: -hydrology null
    • “Steady state flow” model
  • The mass-conserving model: -hydrology routing
• Earth deformation models
  • Point-wise isostasy
  • Lingle-Clark
  • Given bed deformation history

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