复杂河型下槽蓄量计算模式改进方法研究

Study on Improved Method of Calculation Model of Storage Capacity of Complex River Pattern

河道槽蓄量变化是河道演变分析的重要内容,以往多采用断面法进行简化计算,但在多级分汊或有支流汇入的复杂河型中,断面法通常需人工单独处理,计算效率较低。通过引入分汊河道水面宽度比,优化分汊处断面计算面积的分配、增补断面估算支流河口附近漏测区间槽蓄量、采用地形法还原不同水位下断面间距等方法改进后,实现了槽蓄量批量运算。对比结果表明,改进方法大幅提高了槽蓄量计算效率及精度,可为各类复杂河型下的槽蓄量批量运算提供参考。

The change of channel storage capacity is an important content of river evolution analysis.In the past,the section method was mostly used for simplified calculation.However,in the complex river pattern with multistage branching or tributaries,the section method often needs to be dealt with separately,and the calculation efficiency is low.By introducing the water surface width ratio of the branching channel,optimizing the distribution of the calculated area of the section at the branching point,adding the section,estimating the storage capacity of the channel in the missing section near the tributary estuary,and using the topographic method to restore the section spacing under different water levels,the calculation model of the section method under the complex river pattern is improved.The comparison results show that the calculation accuracy of tank storage capacity is greatly improved by using the above method,which can provide a reference for batch calculation of tank storage capacity under various complex river types.