瓯江中上游生态径流分析

Analysis of Characteristics of Ecological Runoff in Upper and Middle Reaches of Oujiang River Basin

分析了瓯江干支流上的圩仁、五里亭、沙湾三站径流量的年际变化及年内分配特征,计算了三站的最小生态径流过程及适宜生态径流过程,采用Tennant法的同期均值比对计算结果进行评价,并对逐月最小生态径流计算方法进行了修正。结果表明,修正后的生态径流量更利于瓯江的生态保护与健康。

Characteristics of interannual variation and intraannual distribution of three hydrologic stations are analyzed in this paper, which are Wuliting, Shawan and Weiren located on the main stream and its branches of Oujiang Basin. And the least ecological flow and optimum ecological flow process of these stations are calculated. Besides, the least ecological flow method is modified on the basis of the evaluation result by Tennant method using the percents of the average flow in the same periods. It shows that the result of the modified method is better for Oujiang River to achieving ecological protection and river health.