Abstract

The flood detention areas play an important role in flood-preventing project of river, because it can divert and store the excessive flood from the river. Simulating the process of breach’s expansion and scouring in the flood diversion of the flood detention area is of practical importance to flood-preventing project. Based on the method of simulating the breach’s scouring process by using a 2-D mathematical model for unsteady flow and non-uniform sediment, the paper also adopts a method to simulate the breach’s expansion. Finally, a new mixed mathematical model is built. It is applied to simulate the flood diversion process of a flood detention area, and the result shows new model can simulate the process of breach’s expansion and scouring reasonably.

Keywords: The flood detention area, sediment, expansion, scouring, numerical simulation