基于物理栖息地模拟的长江中游生态流量研究

将Delft3D水力学模型和栖息地模型组成物理栖息地模拟模型以研究鱼类的生态环境。以长江中游宜昌至枝江河段为研究区域，以长江的重要经济鱼类四大家鱼为目标物种，结合流速及水深两个栖息地限制因子计算研究区域内不同流量下四大家鱼4个产卵场的栖息地面积，得到了流量与栖息地面积关系曲线。分析该曲线，结果表明：长江中游四大家鱼4—6月份产卵期间的最小生态流量为4 570m3/s，适宜生态流量范围为12 000~15 500m3/s。计算结果在传统水文学法界定的生态流量范围之内，分析认为该计算结果更加合理，可为四大家鱼的保护和三峡及葛洲坝工程的生态调度提供参考建议。

Study on instream ecological flow of the middle Yangtze River based on physical habitat simulation

The Delft3D hydraulic model and habitat model were used to constitute a physical habitat simulation model for investigating the ecoenvironment of fishes.Taking the middle reach of the Yangtze River from Yichang to Zhijiang as the study area,and considering four major Chinese carps as target economic fish species,with velocity and depth as constrained factors,the relationship of river discharge and weighted usable area were studied.The results show that in spawning period from April to June,the minimum ecolo...