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Impact Assessment of Spatial Resolution of Radar Rainfall and a Distributed Hydrologic Model on Parameter Estimation
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 Title & Authors
Impact Assessment of Spatial Resolution of Radar Rainfall and a Distributed Hydrologic Model on Parameter Estimation
Noh, Seong Jin; Choi, Shin Woo; Choi, Yun Seok; Kim, Kyung Tak;
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 Abstract
In this study, we assess impact of spatial resolution of radar rainfall and a distributed hydrologic model on parameter estimation and rainfall-runoff response. Radar data measured by S-band polarimetric radar located at Mt. Bisl in the year of 2012 are used for the comparative study. As different rainfall estimates such as R-KDP, R-Z, and R-ZDR show good agreement with ground rainfall, R-KDP are applied for rainfall-runoff modeling due to relatively high accuracy in terms of catchment averaged and gauging point rainfall. GRM (grid based rainfall-runoff model) is implemented for flood simulations at the Geumho River catchment with spatial resolutions of 200m, 500m, and 1000m. Automatic calibration is performed by PEST (model independent parameter estimation tool) to find suitable parameters for each spatial resolution. For 200m resolution, multipliers of overlandflow and soil hydraulic conductivity are estimated within stable ranges, while high variations are found from results for 500m and 1000m resolution. No tendency is found in the estimated initial soil moisture. When parameters estimated for different spatial resolution are applied for other resolutions, 200m resolution model shows higher sensitivity compared to 1000m resolution model.
 Keywords
Distributed hydrologic model;Radar rainfall estimates;Spatial resolution;PEST;Parameter estimation;Uncertainty assessment;
 Language
Korean
 Cited by
1.
이중 편파 레이더 자료를 이용한 강수 추정 알고리즘의 오차 분석,노성진;임상훈;최신우;황석환;이동률;

한국방재학회 논문집, 2014. vol.14. 6, pp.105-116 crossref(new window)
1.
Soil Related Parameters Assessment Comparing Runoff Analysis using Harmonized World Soil Database (HWSD) and Detailed Soil Map, Journal of The Korean Society of Agricultural Engineers, 2016, 58, 4, 57  crossref(new windwow)
2.
Comparison of Quantitative Precipitation Estimation Algorithms using Dual Polarization Radar Measurements in Korea, Journal of Korean Society of Hazard Mitigation, 2014, 14, 6, 105  crossref(new windwow)
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