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首先对三峡蓄水后近坝段内3个水文站实测水位流量资料进行了整理和分析,分析表明3站中枯水水位流量关系变化不同,蓄水后宜昌和枝城枯水水位流量关系变化基本不变,中水水位流量关系有所下降,而沙市枯水水位流量关系有所下降,中水水位流量关系基本不变.然后从河床冲淤、河道侵蚀基准点条件和河道阻力变化3个方面分析了3站水位流量关系变化产生差异的原因,并指出河道侵蚀基点条件是影响3站水位流量关系的主要因素,最后对近坝段水位流量关系的变化趋势进行了预测.
Firstly, the measured data of water level and discharge at three hydrological stations in the vicinity of the Three Gorges reservoir are analyzed and analyzed. The results show that the relationship between the flow of dry water and water level varies with the changes of Yichang and Zhicheng, The relationship between water flow and discharge in the middle reaches of the city decreased but the relationship between the discharge of dry water and the water flow in the deserted city decreased somewhat and the relationship between the water level and discharge in the middle reaches of the city was basically unchanged.From the three aspects of river bed scouring and silting, The reason of the difference of the relationship between the water level and the discharge at the three stations was analyzed. It was pointed out that the condition of the base point of the river channel erosion was the main factor affecting the relationship between the water level and the flow rate at the three stations. Finally, the trend of the water level and the flow rate at the near dam was predicted.