白鹤滩水库回水支流的鱼类 栖息地模拟评估

基于河道内流量增加法（IFIM），采用River2D对白鹤滩水库回水支流黑水河进行水动力模拟和鱼类栖息地模拟，根据加权可利用面积（WUA）分析蓄水前后鱼类适宜物理栖息地的数量变化和质量变化。结果显示：蓄水后，按蓄水水位不同，适宜栖息地总面积仅为自然状况下的0.8%～25.3%，且呈边缘化分布。根据水库调度运行方案，蓄水后春夏季节栖息地总量将高于秋冬季节，与蓄水前情况相反。

Simulative evaluation of fish habitat of backwater tributary of Baihetan Reservoir

Based on the Instream Flow Incremental Methodology（IFIM）， the hydrodynamic simulation and fish habitat simulation are made for the backwater tributary of Baihetan Reservoir by the program of River2D， and then both the quantity change and quality change of the physical habitats therein before and after impoundment of the reservoir are analyzed in accordance with the weighted usable area（WUA）. The result shows that after the impoundment， the total area of the suitable habitat is only 0.8%~25.3% of that under the natural condition and even shows a marginalized distribution according to the difference of the impoundment level. On the basis of the reservoir operation scheme， the total amount of habitats therein within the seasons of spring and summer is to be larger than that within the autumn and winter seasons after the impoundment， which is opposite against that before the impoundment.