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首页> 外文期刊>Journal of the American Water Resources Association >A NEW FLOOD INDEX FOR USE IN EVALUATION OF LOCAL FLOOD SEVERITY: A CASE STUDY OF SMALL UNGAUGED CATCHMENTS IN KOREA
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A NEW FLOOD INDEX FOR USE IN EVALUATION OF LOCAL FLOOD SEVERITY: A CASE STUDY OF SMALL UNGAUGED CATCHMENTS IN KOREA

机译：用于评估当地洪水严重程度的一种新的洪水指数：以韩国的小型空置集水区为例

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The aim of this article is to develop a new index measuring the severity of floods in small ungauged catchments for initial local flood information by the regression analysis between the new flooding index and rainfall patterns. Although a rapid local flood caused by heavy storm in a short period of time is now one of common natural disasters worldwide, such a sudden and violent hydrologic event is difficult to forecast. As local flooding rises rapidly with little or no advance warning, the key to local flood forecasting is to quickly identify when and where local flooding above a threshold is likely to occur. The new flooding index to characterize local floods is measured by the three normalized relative severity factors for the flood magnitude ratio, the rising curve gradient, and the flooding duration time, quantifying characteristics of flood runoff hydrographs. The new flooding index implemented for the two selected small ungauged catchments in the Korean Peninsula shows a very high correlation with logarithm of the 2-h maximum rainfall depth. This study proposes 30 mm of rainfall in a 2-h period as a basin-specific guidance of precaution for the incipient local flooding in the two study catchments. It is expected that the best-fit regression equation between the new flooding index and a certain rainfall rate can provide preliminary observations, the flood threshold, and severity information, for use in a local flood alert system in small ungauged catchments. Editor's note: This paper is part of a featured series on Korean Hydrology. The series addresses the need for a new paradigm of river and watershed management for Korea due to climate and land use changes.
机译：本文的目的是通过对新的洪水指数和降雨模式之间的回归分析，开发出一种新的指数，用于测量小型无流域集水区的洪水严重程度，以获取初始的局部洪水信息。尽管现在短时间内暴风雨造成的局部快速洪水已成为全球范围内常见的自然灾害之一，但这种突发性和剧烈的水文事件很难预测。由于本地洪水迅速上升而几乎没有预警或没有预警，因此本地洪水预报的关键是迅速确定何时和何处可能发生超过阈值的本地洪水。表征局部洪水的新洪水指数是通过以下三个标准化的相对严重性因子来衡量的：洪水强度比，上升曲线坡度和洪水持续时间，量化洪水径流图的特征。针对朝鲜半岛两个选定的小型非流域实施的新洪水指数显示出与2小时最大降雨深度的对数高度相关。这项研究提出了在2小时内30 mm的降水量，作为针对两个研究流域初期局部洪水的针对流域的具体指导。可以预期，在新的洪水指数和一定的降雨率之间的最佳拟合回归方程可以提供初步的观测结果，洪水阈值和严重性信息，以供小型无污染流域的当地洪水警报系统使用。编者注：本文是《韩国水文学》精选系列的一部分。该系列解决了由于气候和土地用途的变化，韩国需要一种新的河流和流域管理范式的需求。

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