基于断面法的长江分汊河道冲淤计算方法

Erosion and deposition calculation in braided channel of Changjiang River based on section method

长江河道槽蓄量、冲淤量计算是长江水文泥沙监测和河道演变分析研究工作信息化的重要基础。为了提高长江河道冲淤计算的准确性,在传统断面法计算的基础上,针对分汊河道平面形态,引入分汊河道分流比参数,提出了一种基于断面法的复杂河道冲淤计算方法。该方法通过组织管理长江河道水文断面数据,计算并引入分汊河道分流比,分别计算起止断面间的长江河道不同测次的河道槽蓄量、冲淤量。基于断面法,在长江水文泥沙管理信息系统GeoHydrology软件中实现了含有分汊河道的冲淤计算,可支持Excel表格方式的水文断面数据的处理和分析。结果表明:该方法对于具有分汊形态的长江河道冲淤计算是快捷和有效的,提高了长江复杂河道水文泥沙计算的准确性。

The calculation of channel storage and erosion-deposition amount of the Changjiang River is an important basis for the informatization of hydrological and sediment monitoring and river evolution analysis.In order to improve the accuracy of the calculation of channel erosion-deposition amount in the Changjiang River,based on the traditional cross-section method and according to the plane shape of braided channel,a calculation method of complex channel erosion-deposition amount is proposed by introducing the parameters of the braided channel diversion ratio.By organizing and managing the hydrological section data of the Changjiang River,we calculates and introduces the diversion ratio of the braided channel by this method,calculates the channel storage and erosion-deposition amount between the start and end sections of different measurement times.Using this method,the calculation of erosion-deposition amount of the braided channel is realized in the software GeoHydrology of Information Analysis and Management System on Hydrology and Sediment of the Changjiang River,which can support the processing and analysis of hydrological section data in Excel form.The results show that this method is effective and fast for the calculation of erosion-deposition amount of the Changjiang River channel with branching shape,and can improve the accuracy of hydrological and sediment calculation for the complicated channel of the Changjiang River.