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http://dx.doi.org/10.12652/Ksce.2014.34.5.1443

Impact Assessment of Spatial Resolution of Radar Rainfall and a Distributed Hydrologic Model on Parameter Estimation  

Noh, Seong Jin (Korea Institute of Civil Engineering and Building Technology)
Choi, Shin Woo (Korea Institute of Civil Engineering and Building Technology)
Choi, Yun Seok (Korea Institute of Civil Engineering and Building Technology)
Kim, Kyung Tak (Korea Institute of Civil Engineering and Building Technology)
Publication Information
KSCE Journal of Civil and Environmental Engineering Research / v.34, no.5, 2014 , pp. 1443-1454 More about this Journal
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;
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Times Cited By KSCI : 11  (Citation Analysis)
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