Determination of Clark unit hydrograph parameters for estimating probable maximum flood

IF 2.7 4区环境科学与生态学 Q2 Environmental Science

Hydrology Research Pub Date : 2023-01-21 DOI:10.2166/nh.2023.120

Jinwook Lee, C. Yoo

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引用次数: 1

Abstract

The probable maximum flood (PMF) is the flood caused by the probable maximum precipitation (PMP). A unit hydrograph (UH) is generally used to derive the PMF for the given PMP, but a method is needed to modify the UH parameters to reflect the PMP condition. This study presents a new method using the estimated channel velocity to modify the Clark UH parameters under the ordinary condition into those under the PMP condition. This study considers major dam basins in Korea and evaluates the application results in comparison to several previous studies. As application results of the proposed method, the Clark UH parameters under the PMP condition are found to be within the range 39–53% of those under the ordinary condition, with their mean ofabout 44%. The UH derived by applying this mean ratio shows that its peak time and the peak flow are just 44 and 227% of the UH under the ordinary condition, respectively. This change from the ordinary condition to the PMP condition is more extreme in Korea than that in Australia and the United Kingdom. This extreme change seems to be due to the climate in Korea, located in the Asian Monsoon region.

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估算可能最大洪水的克拉克单位过程线参数的确定

可能最大洪水(PMF)是由可能最大降水引起的洪水。一般采用单位线(UH)来推导给定PMP的PMF，但需要一种修改UH参数以反映PMP条件的方法。本文提出了一种利用估计通道速度将普通条件下的Clark UH参数修改为PMP条件下的Clark UH参数的新方法。本研究考虑了韩国的主要水坝流域，并将应用结果与之前的一些研究进行了比较。作为该方法的应用结果，发现PMP条件下的Clark UH参数在普通条件下的39-53%范围内，其平均值约为44%。应用该平均比值求得的流量，其峰值时间和峰值流量分别仅为普通工况下流量的44%和227%。这种从普通状态到PMP状态的转变在韩国比在澳大利亚和英国更为极端。这种极端的变化可能与韩国的气候有关，因为韩国处于亚洲季风区。

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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来源期刊

Hydrology Research Environmental Science-Water Science and Technology

CiteScore

5.30

自引率

7.40%

发文量

审稿时长

17 weeks

期刊介绍： Hydrology Research provides international coverage on all aspects of hydrology in its widest sense, and welcomes the submission of papers from across the subject. While emphasis is placed on studies of the hydrological cycle, the Journal also covers the physics and chemistry of water. Hydrology Research is intended to be a link between basic hydrological research and the practical application of scientific results within the broad field of water management.