河网对流输移问题的求解及应用

本文针对平原河网地区，河道纵横交错，水流流向顺逆不定、水流中输送的物质浓度属非稳态非均匀变化等特点，推导得到了适用于各种流动情况下，求解河网对流输移问题隐式差分方程的一套计算公式，及相应的河网计算方法，运用这一方法进行数值求解，不仅能反映上述各种特点，还具有所需的计算机内存少，计算速度快，易于掌握及应用方便等优点。

Solution and application of convection transport problem for river network

In consideration of the characteristics of the unsteady flow with variable directions and unsteady nonuniform convection transport in plain river network,a series of recursion equations and the numerical method have been derived to solve the implicit difference equations ofconvection transport problem for river network.The method not only reflects the characteristics mentioned but also has the advantages of small memory space required by computer, the fast calculating speed and convenient application.The method has been applied to the regional program controlling water pollution of river network for Wuxi city and Pudong of Shanghai city.