大渡河上游某河段鱼类栖息地适宜性评价

Suitability evaluation of fish habitat for one upper reach of Dadu River

以大渡河上游某水电站坝下13 km大渡河干流河段和坝下支流入大渡河汇合口以上4 km支流河段鱼类栖息地为研究河段,从鱼类有效栖息地面积计算、支流河底连通性模拟两方面开展栖息地适宜性评价,重点分析评价了产卵期齐口裂腹鱼和重口裂腹鱼两种目标鱼类对流速与水深的适宜性指标,得到了研究河段鱼类栖息地适宜性指数和等级:坝下干流鱼类栖息地适宜性指数为0.68,适宜性等级为适宜;支流河口以上4 km河段鱼类栖息地适宜性指数为0.58,适宜性等级为一般适宜评价。

By selecting the fish habitats at the main stream of Dadu River 13 km below the dam of a hydropower station and in the upper tributary reaches 4 km above the confluence of Dadu River and tributary as studying objects,the habitat suitability evaluation was carried out from two aspects:the calculation of effective habitat area for fish and the simulation of river bottom connectivity of the tributary.The suitability indexes of two target fish,Schizothorax prenanti and Schizostomus distomus,in spawning period were analyzed and evaluated to obtain the suitability index of fish habitat suitability index and grade of fish habitat suitability index in the study reach.The habitat suitability index of fish in the main stream below the dam was 0.68,and the suitability grade was suitable.The habitat suitability index of fish in the 4 km river above the mouth of the tributary is 0.58,and the suitability grade is generally suitable.