CHARACTERIZATION OF FLASH FLOODS IN EASTERN KENTUCKY
CHARACTERIZATION OF FLASH FLOODS IN EASTERN KENTUCKY
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DOI：
10.1061/(asce)1084-0699(2000)5:3(327
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发表时间：
2000-07-01
影响因子：
2.4
通讯作者：
Kyiamah, George K.
中科院分区：
文献类型：
--
作者：
Bhaskar, Nageshwar R.;French, Mark N.;Kyiamah, George K.
在过去，山洪暴发的特点是降雨和有限的努力，从径流的角度来研究它们。例如，山洪与其他洪水有何不同，这一问题仍有待研究。为了满足这一需要，选择了肯塔基州东部4个流域的30次洪水径流过程线进行分析。在山洪暴发的情况下，过程线的某些部分，如上升的分支，达到峰值的时间和峰值的大小是重要的。要认识到这一点，径流过程线特性，如上升曲线坡度，K，洪水震级比，M和洪水响应时间，TP，直接从观测到的洪水进行评估。使用这些特征，确定相对严重性因子RK、RM和RT，并将其相加以获得山洪指数RF。本研究的结果表明，1995年5月18日报告的暴洪事件具有RK = 3、RM = 16和RT = 6的值以及暴洪指数RF = 25。总体而言，一半的洪水事件的山洪指数大于或等于15。
In the past, flash floods were characterized by rainfall and limited effort was made to examine them from a runoff perspective. For example, the question of how flash floods differ from other floods remains to be investigated. In order to satisfy this need, runoff hydrographs of 30 flood events from four watersheds in eastern Kentucky are selected and analyzed. In flash flood situations, certain portions of the hydrograph, such as the rising limb, time to peak, and magnitude of the peak, are important. To recognize this, runoff hydrograph characteristics such as the rising curve gradient, K, flood magnitude ratio, M, and flood response time, TP, are evaluated directly from observed floods. Using these characteristics, relative severity factors RK, RM, and RT are determined and summed to obtain a flash flood index, RF. Results from this study show that a reported flash flood event of May 18, 1995, has values RK = 3, RM = 16, and RT = 6 and a flash flood index, RF = 25. Overall, half of the flood events have flash flood indices greater than or equal to 15.