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根据在水文现象中广泛存在的自相似性，将标度不变性引入洪量历时关系，对大流域洪量随历时变化的性质进行了研究． 用全国不同流域、不同地理气候条件地区的 17 个水文站的洪水资料，对洪量随历时的变化性质进行了研究． 结果表明：在一定的历时范围内，大流域洪量随历时变化具有单标度性质． 由洪量随历时变化的标度性质，建立了洪水强度历时公式．
Based on the self-similarities that exist widely in hydrological phenomena, the invariance of scale is introduced into the relation of flood duration and duration, and the characteristics of flood variation with time in the basin are studied. By using the flood data from 17 hydrological stations in different watersheds and geographically and climatically varying regions of the country, the changing characteristics of flood amount with time are studied. The results show that the flood volume of a large catchment has a single scale property with the lapse of time within a certain duration. Based on the scaling properties of flood volume with time lapse, the flood intensity duration formula was established.