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http://dx.doi.org/10.3741/JKWRA.2004.37.2.133

A Study on Calibration of Tank Model with Soil Moisture Structure  

Kang, Shin-Uk (한국건설기술연구원 수자원연구부)
Lee, Dong-Ryul (한국건설기술연구원 수자원연구부)
Lee, Sang-Ho (부경대학교 건설공학부)
Publication Information
Journal of Korea Water Resources Association / v.37, no.2, 2004 , pp. 133-144 More about this Journal
Abstract
A Tank Model composed of 4 tanks with soil moisture structure was applied to Daecheong Dam and Soyanggang Dam watersheds. Calibration and verification were repeated 332 and 472 times for each watershed using SCE-UA global optimization method for different calibration periods and objective functions. Four different methods of evapotranspiration calculation were used and evaluated. They are pan evaporation, 1963 Penman, FAO-24 Penman-Monteith, and FAO-56 Penman-Monteith methods. Tank model with soil moisture structure showed better results than the standard tank model for daily rainfall-runoff simulation. Two types of objective function for model calibration were found. Proper calibration period are 3 years, in which dry year and flood year are included. If a calibrationperiod has an inadequate runoff rate, the period should be more than 8 years. The four methods of eyapotranspiraton computation showed similar results, but 1963 Penman method was slightly inferior to the other methods.
Keywords
Tank model; soil moisture structure; obkective function; calibration period; evapotranspiration;
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