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铜锣峡峡谷壅水作用是一个备受关注的问题,特别是其对上游重庆主城区河段洪水位的影响。针对这一热点问题,该文通过河工模型试验成果和原型实测资料分析及数值模拟计算,分析了天然情况及三峡水库175 m试验性蓄水后峡谷壅水规律,包括峡谷产生壅水的临界流量、壅水强度及影响范围。结果表明:天然情况下峡谷开始产生壅水的流量约为15000 m3/s,随着上游来流量的增大,峡谷壅水作用逐渐增强,壅水作用可影响至重庆主城区河段嘉陵江汇口附近;三峡水库175 m试验性蓄水后,坝前水位低于155 m时,峡谷壅水作用与天然情况下基本一致,坝前水位高于155m时,峡谷壅水作用相对天然情况下有所减弱,壅水作用的临界流量约为12000 m3/s–13000 m3/s;相对上游来流量和三峡坝前水位而言,铜锣峡峡谷壅水作用对重庆主城区河段洪水位增加没有控制性作用;而拓宽铜锣峡峡谷段河宽可削弱或消除峡谷壅水作用,对重庆主城区防洪有利。
The gushing effect of the gulf in gorges gorge is an issue of great concern, especially its impact on the flood level in the upper reach of the main urban area of Chongqing. In response to this hot issue, this paper analyzes the natural conditions and the law of canyon water after the 175 m experimental impoundment of the Three Gorges Reservoir, including the critical flow rate of canyon generated by the canyon, through the river model test results and prototype measured data analysis and numerical simulation calculation. , Water strength and impact range. The results show that the flow of gully water from the gorge in natural condition is about 15000m3 / s. With the increase of upstream flow, the effect of gully water gradually increases. The effect of gully water can affect the Jialing River gully in the main urban area of Chongqing ; After the experimental impoundment of the Three Gorges Reservoir of 175 m in the Three Gorges Reservoir, when the water level in front of the dam is less than 155 m, the action of gully water is basically the same as that in natural conditions. When the water level in front of the dam is higher than 155m, The critical flow of weakening and slugging water is about 12000 m3 / s-13000 m3 / s. In terms of the upstream flow rate and the water level in front of the Three Gorges Dam, the effect of floodwater from Tonghting Gorge has no control over the increase of flood level in the main urban area of Chongqing And widening the gulch width of Tongluo Gorge can weaken or eliminate the gully gully water, which is good for flood control in the main urban area of Chongqing.