读“水库蓄洪功能示意图”，回答题。
若在我国某大型外流河中上游修建多座以调洪蓄洪功能为主的水库，则()。查看材料
- A.枯水期下游流水搬运能力增强
- B.防洪标准降低
- C.下游流量季节性变化增大
- D.三角洲面积增速加快
正确答案及解析
正确答案
解析
水库在洪水期蓄水，河流下游流量减小；枯水期放水，下游流量增大，流水的搬运能力增强，因此修建水库后河流下游流量的季节变化减小。修建水库使得河流下游水量减少，泥沙含量减少，海水侵蚀增强，三角洲面积增速减缓。水库的蓄洪作用提高了防洪标准。
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