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在洪水汇流计算中,考虑非线性作用的方法不少,但一般比较复杂,不便于实际应用,有的又因过分简单而精度不高。我们在求解简化非线性圣维南方程组中,采用了“变动定比”有限差的办法,得到与简化线性圣维南方程组解的相似结果,并由此导得线性和非线性两种演算系统之间的坐标转换关系,可把常用线性法演算的成果改正为非线性成果。方法简捷,便于应用。由于非线性汇流的复杂性,为了实用,推演过程中不得不作必要的近似处理,以简化计
In the calculation of flood confluence, there are quite a few ways to consider the non-linear effect, but it is generally complicated, which is inconvenient for practical application. Some are over simple and not precise enough. In solving the simplified nonlinear Saint-Venant equations, we adopt the method of “finite difference of variation” to obtain the similar result to simplify the solution of the linear Saint-Venant equation and derive the two linear and nonlinear algorithms Coordinate conversion between the results of common linear calculus can be corrected as a non-linear results. The method is simple and easy to use. Due to the complexity of non-linear convergence, in order to be practical, it is necessary to make the necessary approximation in the process of deduction to simplify the calculation