影响寸滩水位流量关系的水力因素探讨

Discussion on hydraulic factors affecting stage-discharge relation at Cuntan hydrological station

寸滩水文站水位流量关系变化不仅影响重庆附近防洪形势,亦关系到三峡水库入库洪峰和水量计算的准确性。重点分析了洪水峰型、洪水形态、河道断面变化及三峡水库坝前水位等影响因素,选取长江上游多场历史典型洪水,基于实况比较及数值模拟手段,量化分析了不同水力因素影响下寸滩水文站水位流量关系的变化规律,为保障重庆市主城区和长江流域的防洪安全提供了技术支撑。

The change in stage-discharge relation at Cuntan hydrological station not only affects the flood control near Chongqing,but also affects the accuracy in the calculation of flood peak and water quantity entering into the Three Gorges Reservoir.This paper focuses on the influencing factors such as flood peak patterns,flood shape,changes in river cross-section,and water level in front of the dam.By selecting several typical flood events in the upper reaches of the Yangtze River,and by means of comparison and numerical simulation,we quantitatively analyzed the stage-discharge relation at Cuntan hydrological station under the influence of different hydraulic factors.The analysis provides technical support for ensuring the safety of the urban area of Chongqing and the Yangtze River Basin.