Preissmann隐式格式在新沂河洪水演进中的应用研究

Study on Application of Preissmann Implicit Scheme in Flood Routing of Xinyi River

针对新沂河下游河道的特点,利用Preissmann格式对圣维南方程组进行离散,求解洪水的传播过程。文中采用了追赶法和牛顿迭代法两种较为有效的方法,重点介绍了牛顿迭代法的求解过程,并对两种计算结果进行了比较。计算结果表明,计算值与实测值吻合较好,两种算法是可行的。

According to the characters of the lower channel of Xinyi River,this paper makes use of Pressmann Implicit Scheme in dispersion of Saint-Venant Equation. Two efficient methods, such as chasing method and Newton Iterative Method are used,but the emphasis is based on the introduction of Nwton Iterative Method.By the contrast of the results of two methods,we can find that the computed water levels and discharges agree with the measured values well, and both computed results are reasonable.