西江干流(大藤峡至高要段)洪水演进数值模拟

Numerical Simulation of the Flood Routing of Xijiang River( Datengxia- Gaoyao)

针对西江干流河道特点,考虑洪水归槽的影响,建立了河道一维非恒定流洪水演进数学模型,采用Preissmann四点偏心隐式差分格式离散圣维南方程组,应用追赶法求解非恒定流圣维南方程组。根据实测资料对西江干流(大藤峡至高要段)洪水演进过程进行验证,结果表明:模型能较好的模拟流量变化过程,模拟值与实测值符合较好,验证了该模型是合理可行的。可用于洪水预报、枯季调水等研究。

According to the characteristics of Xijiang River, considering the influence of flood, a one-dimensional unsteady flow of flood evolution model is established.The Saint Venant equations are discredited by use of the Preissmann four point eccentric implicit difference schemes and are solved by chasing method.Based on the measured data of the Xijiang River （ Datengxia -Gaoyao） , this model is verified by flood routing.The results show that the model can simulate the flow change process better, and the simulated values accord well with the measured values.It is verified that the model is reasonable and feasible.And it can be used to study the flood forecasting, the dry season water diversion etc.