澧水流域山溪性河流生态基流的计算与分析

Calculation and analysis of ecological base flow of rivers in Lishui River basin

本文采用Tennant法和Q_(p)法两种常见水文学方法计算澧水9个水文站点生态基流值,评价枯水期月份生态基流满足程度。计算结果表明:Tennant法计算成果普遍大于Q_(p)法计算成果,而且在枯水期月份满足程度较低,山溪性河流生态基流宜采用Q_(p)法计算。集水面积与Q_(p)法、Tennant法计算的生态基流值之间具有较好线性拟合关系,相关经验公式可用于流域其他断面生态基流的计算。

In this paper,Tennant method and Q_(p) method are used to calculate the ecological base flow values of 9 hydrological stations in Lishui,and to evaluate the satisfaction degree of ecological base flow in dry season.The calculation results show that the calculation results of Tennant method are generally larger than those of Q_(p) method,and the satisfaction degree is low in dry months,so Q_(p) method should be adopted to calculate the ecological base flow of mountain rivers.There is a good linear fitting relationship between the catchment area and the ecological base flow value calculated by Qp and Tennant methods,and the relevant empirical formula can be used to calculate the ecological base flow in other sections of the basin.