金沙江下游梯级水库防洪库容调整对川江防洪的影响分析

Effect of Cascade Reservoirs Operation for Flood Control on the Chuan River

为弄清金沙江下游梯级水库防洪库容预留大小对川江河段防洪的作用,设定原设计防洪库容、防洪库容削减一半、不预留防洪库容三种防洪库容预留方案。根据金沙江下游四座梯级水库的汛期运行方式,对各防洪库容预留方案不同典型不同频率下的设计洪水进行调洪演算,防洪调度结果显示,当岷江和其它区间支流汇入洪量较大时,梯级水库对川江防洪的补偿作用不明显;当金沙江处洪量较大时,各防洪库容预留方案对川江河段防洪效果差异较大,相对其他两种方案,原设计防洪库容的方案对川江河段防洪效果较好;削减一半防洪库容的方案在遇较大洪水时对川江防洪有一定的影响;而不预留防洪库容的方案基本不能保证川江河段防洪安全。

In order to analyze the effect of cascade reservoir storages on flood control of the Chuan River, three flood control storage schemes, which are design flood control storage half of design flood control stor-age and none storage, are assumed. For the design flood with different frequencies, a flood control cascade operation model has been adopted to simulate the regulation of flood control operation. The results show that if inflow from the Min River and other tributaries are larger, the flood control effect of the lower Jinsha River cascade reservoirs on the Chuan River wouldn’t be significant. If inflow from the Jinsha River is larger, the effect of flood control on the Chuan River with each scheme will be different. The scheme of design flood control storage has the best flood control effect;while the scheme with none storage can’t guarantee flood control safety of the Chuan River.