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http://dx.doi.org/10.3741/JKWRA.2014.47.10.867

Application of the Radar Rainfall Estimates Using the Hybrid Scan Reflectivity Technique to the Hydrologic Model  

Lee, Jae-Kyoung (Weather Radar Center, Korea Meteorological Administration)
Lee, Min-Ho (Weather Radar Center, Korea Meteorological Administration)
Suk, Mi-Kyung (Weather Radar Center, Korea Meteorological Administration)
Park, Hye-Sook (Weather Radar Center, Korea Meteorological Administration)
Publication Information
Journal of Korea Water Resources Association / v.47, no.10, 2014 , pp. 867-878 More about this Journal
Abstract
Due to the nature of weather radar, blank areas occur due to impediments to observation, such as the ground clutter. Radar beam blockages have resulted in the underestimation rainfall amounts. To overcome these limitations, this study developed the Hybrid Scan Reflectivity (HSR) technique and compared the HSR results with existing methods. As a result, the HSR technique was able to estimate rainfalls in areas from which no reflectivity information was observable using existing methods. In case of estimating rainfalls depending on reflectivity scan techniques and beam-blockage/non beam-blockage, the HSR accuracy is superior. Furthermore, rainfall amounts derived from each method was inputted to the HEC-HMS to examine the accuracy of the flood simulations. The accuracy of the results using the HSR technique in contrast to the RAR calculation system and M-P relation was improved by 7% and 10%(based on correlation coefficients), and 18% and 34%(based on Nash-Sutcliffe Efficiency), on average, respectively. Therefore, it is advised that the HSR technique be utilized in the hydrology field to estimate flood discharge more accurately.
Keywords
radar rainfall; radar beam blockage; Hybrid Scan Reflectivity; HEC-HMS;
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