HWSD와 정밀토양도를 이용한 유출해석시 토양 매개변수 특성 비교 평가
Soil Related Parameters Assessment Comparing Runoff Analysis using Harmonized World Soil Database (HWSD) and Detailed Soil Map
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초록
Harmonized World Soil Database (HWSD) including the global soil information has been implemented to the runoff analysis in many watersheds of theworld. However, its accuracy can be a critical issue in the modeling because of the limitation the low resolution reflecting the physical properties of soilin a watershed. Accordingly, this study attempted to assess the effect of HWSD in modeling by comparing parameters of the rainfall-runoff model usingHWSD with the detailed soil map. For this, Grid based Rainfall-runoff Model (GRM) was employed in the Hyangseok watershed. The results showedthat both of two soil maps in the rainfall-runoff model are able to well capture the observed runoff. However, compared with the detailed soil map, HWSDproduced more uncertainty in the GRM parameters related to soil depth and hydraulic conductivity during the calibrations than the detailed soil map. Therefore, the uncertainty from the limited information on soil texture in HWSD should be considered for better calibration of a rainfall-runoff model.
Abstract
Harmonized World Soil Database (HWSD) including the global soil information has been implemented to the runoff analysis in many watersheds of theworld. However, its accuracy can be a critical issue in the modeling because of the limitation the low resolution reflecting the physical properties of soilin a watershed. Accordingly, this study attempted to assess the effect of HWSD in modeling by comparing parameters of the rainfall-runoff model usingHWSD with the detailed soil map. For this, Grid based Rainfall-runoff Model (GRM) was employed in the Hyangseok watershed. The results showedthat both of two soil maps in the rainfall-runoff model are able to well capture the observed runoff. However, compared with the detailed soil map, HWSDproduced more uncertainty in the GRM parameters related to soil depth and hydraulic conductivity during the calibrations than the detailed soil map. Therefore, the uncertainty from the limited information on soil texture in HWSD should be considered for better calibration of a rainfall-runoff model.
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