NUMERICAL MODELING OF ICE JAM FORMATION IN THE WŁOCŁAWEK RESERVOIR

Abstract

Ice jam formation in a run-of-the-river reservoir and the effects of ice jam on water levels and water velocity were simulated using a two-dimensional model for simulating river ice dynamics (DynaRICE). The record ice jam of January 1982 in the Włocławek Reservoir is also examined here. The simulation showed that the ice jam in question was formed by surface ice produced in the Vistula River, upstream of the reservoir. The effect of thermal production of suspended frazil in the reservoir on ice jam was negligible. The simulated water level as well as the ice jam profile were in agreement with the observed data. The ice discharge upstream of the reservoir and the volume of ice in the Włocławek Reservoir were calculated. The results showed that there was less ice in the reservoir than claimed in previous literature. Suspended frazil and the undercover transport mechanism were not taken into account in this study.