Fully coupled model of ice-jam dynamics

This paper presents a numerical model that simulates the dynamic failure and re-formation of an ice jam. The model comprises a simultaneous solution of the 1D, unsteady Row equations (conservation of mass and momentum) for water now and ice motion. its use is demonstrated in the routing of flow hydrographs through a channel containing an initial jam or accumulation of broken ice. The model shows the extent to which changes in Row discharge may affect profiles of Jam thickness and flow depth for these situations. It also shows how ice momentum may affect the jam-thickness profile. Dimensionless parameters, characterizing initial jam stability and the shape of the hydrograph. are identified to indicate conditions when changes in Row discharge and ice momentum should be taken into account when estimating jam thickness.