松花江支流西北河生态流量分析研究

Analysis and Research on Ecological Discharge of Northwest River as a tributary of Songhua River

河流生态流量的确定是保障河道生态系统健康的重要因素之一。为确定适合于西北河流域实际情况的生态流量目标值,以期为西北河基本生态流量保障工作提供一定的参考,选取频率曲线法、Tennant法、Qp法3种方法,对西北河生态需水量进行分析研究。结果表明,比较各类方法的计算结果及其结合西北河丰枯变化大的水文特征,Q90%法最为适用于西北河生态流量目标的确定,且计算得到的生态流量保障程度在汛期和非汛期均达到90%以上。对西北河生态流量分析研究的计算结果不仅可以为其基本生态流量的保障提供参考,而且可以为流域水资源利用规划提供一定的依据。

The determination of river ecological discharge is one of the important factors to ensure the health of river ecosystem. In order to determine the target value of ecological discharge suitable for the actual situation of the Northwest River basin, in order to provide some reference for the basic ecological discharge guarantee work of the Northwest River. This paper selected frequency curve method, Tennant method and Qp method to analyze and study the ecological water demand of the Northwest River. The results showed that the Q90% method is most suitable for determining the ecological flow target of the Northwest River by comparing the calculation results of all kinds of methods and combining with the hydrological characteristics of the Northwest River with great changes in the abundance and drought, and the guarantee degree of the calculated ecological flow reached more than 90% in both flood season and non-flood season. The calculation results of the ecological flow analysis of the Northwest River can not only provide a reference for the protection of the basic ecological flow, but also provide a certain basis for the planning of water resources utilization in the basin.