 which defines the bed elevation</li><li><code>params</code>: a <code>Params</code> object that defines physical parameters </li><li><code>solver_params</code>: a <code>SolverParams</code> object that defines parameters relating to the numerical scheme</li><li><code>initial_conditions</code>: an <code>InitialConditions</code> object that (optionally) defines the initial ice thickness, temperature, viscosity, and damage</li><li><code>melt_rate</code>: a melt rate model, responsible for controlling/setting th