基于改进Tennant法的河流生态基流估算

为了使Tennant法更适用于计算我国北方季节性河流的生态基流，对其计算方法进行改进，即引入回归分析的思想，用origin软件处理径流系列，对多年同期月径流量进行多次拟合分析，得出最符合其变化趋势的曲线回归方程，以此求出各平水年对应拟合方程的径流量，将该流量平均值的10%作为当月生态基流量，最后根据各月生态基流得出河流生态基流。桃河生态基流计算结果表明，使用回归分析Tennant法计算得出的生态基流占多年平均径流的10.2%，较传统Tennant法更符合桃河径流现状。

Estimation of River Ecological Base Flow Based on Modified Tennant Method

The Tennant calculation method was improved by introducing the ideas of regression analysis and processing the runoff series with the origin software for making the method more applicable in the calculation of ecological basic flow of the seasonal river in northern China. The fitting analysis of the same period monthly runoff was conducted and the curve regression equation mostly consistent with the trend of runoff was obtained. The runoffs in normal flow year corresponding to the equation were calculated and 10% of the average value of the flow was regarded as ecological basic flow for the current month. Finally, the ecological base flow was figured out on the basis of every monthly base flow. The calculation results of Taohe River show that the ecological base flow calculated by the regression analysis Tennant occupied 10.2% of the average annual runoff, which was more in line with the current situation of Taohe River than the traditional method.