基于非充分掺混模式的流域来水组成模型

Mixed-water model of watershed based on incomplete mixing pattern

针对如何减小数值求解对流输运方程耗散误差的问题,引进断面计算浓度的概念来计算河段平均浓度,提出了非充分掺混模式的有限控制体积法离散对流输运方程的新算法,据此构建了模拟流域内的水源组成以及不同水源在流域内的时空变化情况的流域来水组成模型。通过数值试验与具体实例验证,结果表明所提出的非充分掺混模式的新算法可有效地提高流域来水模型的计算精度。

In order to reduce the numerical diffusion error of the convey-diffuse equation, the concept of concentration on cross section is introduced to calculate the mean concentration of river sections, and a new finite control volume method is put forward based on the incomplete mixing pattern. Depending on above concept, a income water component model is set up, which simulates the water source composition of the basin and describes the spatio-temporal changes of different water sources. By applying th method of inco e present method in calculation, the results are in agreement with the measured data, indicating that the present mplete mixing pattern can improve the accuracy of income water calculation.