Development of Radar Polygon Method : Areal Rainfall Estimation Technique Based on the Probability of Similar Rainfall Occurrence

- Journal title : Journal of Korea Water Resources Association
- Volume 48, Issue 11, 2015, pp.937-944
- Publisher : Korea Water Resources Association
- DOI : 10.3741/JKWRA.2015.48.11.937

Title & Authors

Development of Radar Polygon Method : Areal Rainfall Estimation Technique Based on the Probability of Similar Rainfall Occurrence

Cho, Woonki; Lee, Dongryul; Lee, Jaehyeon; Kim, Dongkyun;

Cho, Woonki; Lee, Dongryul; Lee, Jaehyeon; Kim, Dongkyun;

Abstract

This study proposed a novel technique, namely the Radar Polygon Method (RPM), for areal rainfall estimation based on radar precipitation data. The RPM algorithm has the following steps: 1. Determine a map of the similar rainfall occurrence of which each grid cell contains the binary information on whether the grid cell rainfall is similar to that of the observation gage; 2. Determine the similar rainfall probability map for each gage of which each grid cell contains the probability of having the rainfall similar to that of the observation gage; 3. Determine the governing territory of each gage by comparing the probability maps of the gages. RPM method was applied to the Anseong stream basin. Radar Polygons and Thiessen Polygons of the study area were similar to each other with the difference between the two being greater for the rain gage highly influenced by the orography. However, the weight factor between the two were similar with each other. The significance of this study is to pioneer a new application field of radar rainfall data that has been limited due to short observation period and low accuracy.

Keywords

Radar;Areal rainfall;Mean areal precipitation;Thiessen;Weight;

Language

Korean

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