摘要
用分析法推求时段单位线的过程中,地面径流的误差会被传播,并被累积,结果会对单位线的形状产生较大的负面影响。通过对地面径流误差传播规律的研究,找到了一种能有效改善地面径流的误差传播对单位线推求的影响的方法,即当相邻时段净雨的比大于1时,用逆时序法来推求单位线;当比值小于1时,则采用顺时序法来推求单位线。应用结果表明,该方法能有效地防止地面径流计算误差在单位线推求中被放大,从而获得更为合理的单位线。
In the process of using analytical methods to predict time interval unit hydrographs , the error of surface runoff will he transmitted, and the cumulative result will have a great negative impact on the shape of unit hydrographs. By studying the propagation of the error transmission of surface runoff, we have found a method that can effectively improve the impact of the error transmission on unit hydrographs. When the ratio of adjacent time interval net rainfall is more than 1, the inverse sequence method should be used to produce the unit hydrograph, otherwise, the sequential method. The method is used in two river basins. The results indicate that the method can effectively diminish the error accumulation on unit hydrographs, therefore it leads to more reasonable unit hydrographs.
出处
《中国农村水利水电》
北大核心
2008年第5期5-7,共3页
China Rural Water and Hydropower
基金
国家自然科学基金资助项目(40701024)
关键词
地面径流
时段单位线
误差传播
surface runoff
T-hour unit hydrograph
error transmission
