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http://dx.doi.org/10.3741/JKWRA.2020.53.4.313

Applicability evaluation of radar-based sudden downpour risk prediction technique for flash flood disaster in a mountainous area  

Yoon, Seongsim (Korea Institute of Civil Engineering and Building Technology)
Son, Kyung-Hwan (Water Resources Information Center, Han River Flood Control Office, Ministry of Environment)
Publication Information
Journal of Korea Water Resources Association / v.53, no.4, 2020 , pp. 313-322 More about this Journal
Abstract
There is always a risk of water disasters due to sudden storms in mountainous regions in Korea, which is more than 70% of the country's land. In this study, a radar-based risk prediction technique for sudden downpour is applied in the mountainous region and is evaluated for its applicability using Mt. Biseul rain radar. Eight local heavy rain events in mountain regions are selected and the information was calculated such as early detection of cumulonimbus convective cells, automatic detection of convective cells, and risk index of detected convective cells using the three-dimensional radar reflectivity, rainfall intensity, and doppler wind speed. As a result, it was possible to confirm the initial detection timing and location of convective cells that may develop as a localized heavy rain, and the magnitude and location of the risk determined according to whether or not vortices were generated. In particular, it was confirmed that the ground rain gauge network has limitations in detecting heavy rains that develop locally in a narrow area. Besides, it is possible to secure a time of at least 10 minutes to a maximum of 65 minutes until the maximum rainfall intensity occurs at the time of obtaining the risk information. Therefore, it would be useful as information to prevent flash flooding disaster and marooned accidents caused by heavy rain in the mountainous area using this technique.
Keywords
Sudden downpour; Rain radar; Mountainous area; Risk prediction;
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