【摘要】 介绍了单位线的基本概念和时段单位线转换的原理和方法,分析比较了同一流域上不同时段的时段单位线,指出其相同点为径流量相等,均为一个单位净雨,汇流时间相等;不同点为时段单位线的单位时段越小,其峰值越大,峰现时间越提前,历时越短,而时段长时则相反。认为这符合一般洪水的汇流特征。更多还原

【Abstract】 This paper introduces the basic concept of unit hydrograph and the principles and methods of period unit hydrograph conversion,compares unit hydrograph in different periods,and points out that the similarity is:if the runoff hydrograph,usually one unit of net rainfall,is equal,the convergence time is equal;while the difference is:the shorter the unit period is,the higher the peak value,the earlier the time of occurrence of the peak value,and the shorter of the runoff hydrograph,and things go opposite when the period is longer.The author holds that the conclusion accords with the confluence characteristics of common flood.更多还原