单值化处理长江中游主要断面水位流量关系研究

Single Valued Processing of Stage-Discharge Relation in the Main Cross Section of Middle Reaches of Yangtze River

为更好地开展长江中游防洪影响的研究,在分析沙市、螺山、汉口3个控制站水文断面水位流量关系影响因素的基础上,选取1981—2010年长江中游沙市、螺山、汉口3个控制站主要断面洪水期(5—9月)的水位流量资料,采用综合落差法进行单值化处理,得到了各站水位流量关系曲线成果,并用最小二乘法原理进行曲线的拟合,对其进行了合理性分析。结果表明,通过多项式拟合能将计算出的水位-流量关系线的影响消除到最小。并且由数学公式计算的关系线推出的流量不会因人为定线的差异而导致数据的不同,在实际应用中,效果更好。

To better research the flood control impact on the middle Yangtze River,we analyzed the factors affecting the stage-discharge relation in the cross-sections at three hydrological stations,namely,Shashi,Luoshan,and Hankou Station.Furthermore,on the basis of the measured data of water level and flow during flood season（May-September） from 1981 to 2010,single valued processing is employed to obtain the stage-discharge relation curves,which are further fitted in accordance with the principle of least squares.Results indicate that the impact of stage-discharge curve can be eliminated to a minimum through the polynomial fitting,and the flow deduced from the relation curve calculated by mathematical formulas will be free from inconsistency caused by human objectivity.In practical application,the effect is better.