Numerical Simulation and Optimal System Scheduling on Flood Diversion and Storage in Dongting Basin, China

In recent years a large number of floods occurred in the Dongting Lake region, China, and flood prevention and control have become a focus in the middle Yangtze River. How to use the dispersed sub-fast-flood storage area in Dongting basin rationally and control water level and flow process will improve flood prevention ability. In this paper an improved systematic flood simulation method coupling one and two-dimensional hydraulic model is established aiming at special area. The flood evolution process, different flood discharge scale, flood storage and embanking effect are simulated according to the changing spatial gate position and extra flood magnanimity for the typical hydrologic years. An optimized scheduling scheme by using the parallel algorithm and numerical computing method is preferred in different flood periods. The research results indicate the optimized flood diversion gate and operation scheme in three shunts river system will directly control the water level in the whole lake region. The research results provide practical basis for systematic floods control and is helpful to assess flood disaster in Yangtze River basin.