长江汉口水位受鄂东北及汉江来水影响分析

Analysis of influence on water level of Hankou Station by incoming water of Hanjiang River and the tributaries in northeastern Hubei Province

影响长江中下游干流汉口站水位的因素众多,其不仅受上游干流、支流汉江来水的影响,而且还受下游九江站以及鄂东北诸多中小支流回水顶托的影响,在此复杂的来水情况下,汉口站水位预报难度较大。基于折扣系数法对鄂东北汛期来水顶托影响进行了分析,同时以2010年7月汉口出现洪峰水位27.31 m的洪水预报为例,通过分析水位流量关系及相关图模型的方法,研究汉江及鄂东北诸支流来水对汉口水位的影响。研究结果可为汉口站在复杂来水情况下的水情预报积累经验。

Water level at Hankou Station in the middle reach of Yangtze River is affected by various factors,not only by upper Yangtze River and Hanjiang River,but also by backwater effect of Jiujiang Station in lower Yangtze River,and other tributaries in northeastern Hubei Province;therefore,the forecasting of water level at Hankou Station is difficult.We analyze the backwater effect of tributaries in northeastern Hubei Province in flood season based on discount coefficient method.Taking the flood forecasting of the highest level of 27.31 m in Hankou Station in July,2010 as an example,we analyze the influences of upstream flood of Hanjiang River and the backwater effect of the tributaries in northeastern Hubei Province on water level at Hankou using water level-discharge relation and correlation chart model.The forecasting practice accumulates experience for hydrological forecast of Hankou Station under complex incoming water condition.