河口近岸海域生态需水研究——漳卫新河河口生态需水分析

Studies on Ecological Water Requirement of Bohai Estuaries and Coastal Areas——Ecological water requirement of the Zhangweixin River estuary

应用河口-海岸-海洋模型对漳卫新河河口近岸海域盐度分布进行了模拟,考虑鱼类的盐度耐受能力,分析了不同来水情景下漳卫新河河口的鱼类盐度适宜范围分布面积。研究结果表明,现状来水条件下,漳卫新河河口鱼类盐度适宜范围分布面积较小,生境较差。根据不同来水量与鱼类盐度适宜面积的关系曲线,分析得出维持漳卫新河河口生态系统稳定所需要的最小生态流量约为10m3/s,最适生态流量为160m3/s;最小年需水量为9.4亿m3,适宜年需水量为15.2亿m3。

The ecological water requirement of estuaries and coastal areas around Bohai was in serious condition due to water scarcity.This paper simulates salinity distributions of the Zhangweixin River estuary with ECOMSED model and analyzes the areas with suitable salinity in this region with different freshwater discharges,based on salinity tolerance of fishes.The results show that at current freshwater input scenario,the value of suitable salinity area for fishes in the Zhangweixin River estuary is quite low.The curve is drawn between freshwater inflows and areas of suitable salinity region,which gives results that the minimum ecological water demand of the Zhangweixin River estuary is 10m3/s,and suitable ecological water demand is about 160m3/s.And the minimum and suitable water needed in a year is about 9.4×108m3 and 15.2×108m3 respectively.