北江下游洪水调度的数值模拟

Numerical simulation of flood control in lower reach of Beijiang River

建立了北江下游一、二维耦合洪水演进数学模型.其中一维模型用于北江下游河道的计算,二维模型用于分洪区的计算,并在1999年实测地形的基础上,根据西江、北江各频率洪水沿程各测站水位资料,对一维模型的糙率系数进行了率定验证,利用率定验证后的模型对洪水在北江下游的演进过程进行了计算,取得了较好的计算结果.最后系统分析了飞来峡水利枢纽、芦苞分洪河道及潖江、大塘围、大旺围、清东围、清西围分蓄洪区在北江下游洪水调度过程中的运用效果.

One and two dimensional coupled mathematical model for flood routing is presented. The one dimensional model is applied to the river course of the lower reach of the Beijiang River, and the two dimensional model is employed in the flood diversion area. The roughness of the one dimensional model is estimated and validated using the measured landform in 1999 and the water level data in hydrologic stationis which cover different frequencies along the Beijiang River. The simulation results of flood routing by adopting the one-dimensional model are satisfactory. The effectiveness of different hydraulic projects in flood control of the lower reach of the Beijiang River are systematically analyzed, including the Feilaixia Hydraulic Project, Luhao floodway and Pajiang, Datang, Dawang, Qingdong, Qingxi flood diversion area.