基于区间可行域的河流生态流量多方法耦合模型研究

Research on Multi-method Coupled Model of River Ecological Flow Based on Interval Feasible Regions

河流生态流量的单一计算方法难以满足多功能河道的需求,首先采用生境模拟法、湿周法、Tennant法、Texas法、最小月平均实测净流量法、基于流域水文循环模型的河流生态流量计算方法等多种方法分别计算了西江梧州断面的生态流量,在综合上述几种方法计算结果的基础上,加入一个控制向量,提出了基于区间可行域的河流生态流量多方法耦合模型,计算出每个月基于区间可行域的生态流量。结果表明:耦合模型计算结果比较切合实际,既考虑了河道内基本生态流量的需求也考虑了下游三角洲压咸流量和汛期鱼类生长繁殖的需求,对珠江流域水资源总量控制、西江骨干水库群联合调度以及水资源优化配置等工作具有重要的实践意义和指导意义。

Single calculation method of river ecological flow（ REF） is difficult to meet the demand of multi-functional rivers. This paper calculated REF of Wuzhou section of Xijiang River applied six methods respectively, including habitat simulation method, wet cycle method, Tennant method, Texas method, minimum-monthly measured discharge method, and based on watershed hydrological cycle model method. Based on the above calculated results and adding a control vector, a multi-method coupled model of REF is established, and the result is based on interval feasible regions. And then, the paper calculated the monthly ecological flow of Wuzhou section using the built model. The results show that the outcomes fit the Wuzhou section actually, which not only meet the basic ecological flow of the river, but also meet the demand of downstream delta salty flow control and the demand for fish growth and their reproduction. It is importantly practical and guiding significance to the water resources using total control, the joint operation of the backbone reservoir group, and the optimal allocation of water resources in the Pearl River basin.