Modified NRCS Abstraction Method for Flood Hydrograph Generation

J. Almedeij
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Abstract

The NRCS abstraction method is based on two assumptions. The first is that the ratio of actual water retention after ponding to maximum potential retention after ponding is equal to the ratio of actual surface runoff to potential surface runoff. The second assumption is that the initial abstraction for the watershed is twenty percent of the maximum potential retention. This study shows that both assumptions violate continuity principles and proposes a modification that renders an elementary relationship accounting for all abstraction forms by dividing them into a variable and constant components. Consequently, the surface runoff computation becomes dependent on the soil initial moisture content and implicitly influenced by the initial abstraction, while retaining the advantage of the subjective selection of curve number from extensive database from which the NRCS method has gained popularity. A new time of concentration model is also proposed to extend the computation for flood hydrograph generation.
洪水线生成的改进NRCS抽象方法
NRCS抽象方法基于两个假设。第一个是实际蓄水后截留水量与最大潜在蓄水后截留水量之比等于实际地表径流量与潜在地表径流量之比。第二个假设是分水岭的初始提取量是最大潜在保留量的20%。本研究表明,这两种假设都违反了连续性原则,并提出了一种修改,即通过将所有抽象形式划分为变量和常量组件来呈现一个基本关系。因此,地表径流计算变得依赖于土壤初始含水量,并受到初始抽象的隐含影响,同时保留了从广泛的数据库中主观选择曲线数的优势,NRCS方法已经得到了普及。提出了一种新的浓度时间模型,扩展了洪水线生成的计算。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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