Analysis of stages under ice-covered in winter

Each winter,ice jam may form on rivers in cold regions,causing many problems with its effects on the increasingly wet perimeter and blocking cross.Ice formation has the potential for causing the stage in the river to rise and suddenly catas-trophic flooding.Break ice jams often occur suddenly and induce severe flooding with little warning.It is important to mitigate the stages due to the evolution of ice jam.This paper provides analyses and discussion of ice jam stages with variation in ice discharge and initial flow depth and velocity in straight and curved channels based on the data from the experiment and the field observations at the Hequ gauge station of the Yellow River.