河流生态径流计算的逐月频率计算法

界定了生态径流、最小生态径流、最大生态径流、适宜生态径流的概念,提出了一种新的河流生态径流计算方法——逐月频率计算法,指出了方法的优缺点以及适用范围。以计算洛阳市境内伊河的栾川站和龙门镇站生态径流为例,说明了计算过程,同时用Tennant法作对比。结果表明:运用新的逐月频率计算法比用以往的逐月频率计算法得到的适宜生态径流过程径流量要大,河流的生态状况更好,更有利于河流自身的生态健康和河流周围生物栖息地的保护。

A new monthly frequency computation method for instream ecological flow

This paper defined instream ecological flow, and minimum, maximum and optimal instream ecological flow respectively, proposed a new monthly frequency method for instream ecological flow computation, i.e. the same equal-frequency value being assigned for different months, and analyzed its advantages, disadvantages and applicability. The paper selected the Yihe River in Luoyang city, China as case study site, employed the proposed method to compute the instream ecological flow processes at two typical hydrological stations, and evaluated the computed instream ecological flow by Tennant Method. The results revealed that monthly optimal instream ecological flow rates computed by the proposed method are higher than those by the traditional monthly frequency method, i.e. different frequency values being assigned for different months. The recommended optimal instream ecological flow requests more water for environmental use and more benefits for river health and the habitat conservation in river floodplain and riparian corridors.