平原湖区排涝模数计算方法的比较研究

A Comparison of Methods for Calculating Drainage Mmodulus in the Plain Lake Areas

开展排涝计算方法研究对于合理确定平原湖区的排涝系统规模和有效控制涝灾损失具有重要的现实意义。在对现状排涝计算方法进行系统论述的基础上,选取湖北省四湖流域的螺山排区作为研究区,对平原湖区4种常用排涝模数计算方法(平均排除法、经验公式法、水量平衡法和河网水力学模型法)进行了定量比较,并对排涝计算方法的选取进行了探讨。结果表明:平均排除法、经验公式法、水量平衡法和河网水力学模型法均适用于螺山排区排涝计算。综合考虑到保护对象特点和近期极端天气概率增加等因素,1日暴雨和3日暴雨时,分别选用水量平衡法和经验公式法计算排涝模数偏于安全。研究成果可为平原湖区排涝模数计算方法的合理选取提供参考。

The method for calculation drainage modulus is studied, which is of important practical significance for the determination of thesuitable scale of water logging control projects and effective reduction of waterlogging disaster losses. Based on the systematic illustration ofthe method for calculation drainage modulus of existing circumstances, the Luoshan Drainage Area in Four-lake Watershed in Hubei Provinceis selected as the research area. Drainage moduli calculated with the empirical formula, average draining method, water balance method andhydrodynamic model for river networks are compared quantitatively according to two kinds of water logging control standards. And the selec-tion of methods for calculating drainage modulus in the plain lake areas is discussed. Results show that the empirical formula, average drai-ning method, water balance method and hydrodynamic model for fiver networks are appropriate to calculate drainage modulus in the LuoshanDrainage Area. Considering the characteristics of protected objects and the increased frequency of extreme weather events, drainage modulicalculated by the water balance method and the empirical formula are suggested to ensure the project safety under one-day rainstorm andthree-day rainstorm. The research results can be used as a reference for reasonable selection methods for calculating drainage modulus.