| Title |
Sensitivity Analysis between Watershed Characteristic Factors and Hydrological Parameters Using the HEC-HMS Model |
| Authors |
김하영(Kim, Hayeong);장수형(Jang, Suhyeong);강신욱(Kang, Shinuk);김미은(Kim, Mieun) |
| DOI |
https://doi.org/10.12652/Ksce.2026.46.3.0205 |
| Keywords |
댐 유역특성; HEC-HMS; 상관분석; 민감도분석; 매개변수 Watershed characteristics; HEC-HMS; Correlation analysis; Sensitivity analysis; Parameter |
| Abstract |
The increasing occurrence of localized intense rainfall has emphasized the importance of accurate rainfall?runoff analysis for flood mitigation and dam safety. In general, the accuracy of the HEC-HMS model commonly used in hydrological practice largely depends on the appropriateness of the model parameters. In this study, the HEC-HMS model was developed for 12 water resource dam watersheds managed by K-water using topographic and hydro-meteorological data. To ensure the reliability of the constructed model, validation was conducted focusing on extreme rainfall events during the annual flood season, and the results showed satisfactory performance with NSE > 0.7. Correlation and sensitivity analysis were conducted using watershed physical characteristics and calibrated hydrological parameters. The correlation analysis indicated that the relationships between variables significantly depending on the watershed size of the dam basins. Sensitivity analysis indicated that the time of concentration(Tc) and storage coefficient(K) have significant influences on peak discharge in small to medium-sized watersheds. This study identified the relationships between hydrological parameters and watershed characteristics, establishing parameter standards for different watershed scale. These findings are expected to serve as foundational data for parameter regionalization considering future watershed characteristics. |