| Title |
Parameter Sensitivity Analysis of Vflo™ Model In Jungnang basin |
| Keywords |
distributed model;Vflo™ Model;sensitivity analysis;분포형 모형;VflO™ 모형;민감도 분석 |
| Abstract |
Watershed models, which are a tool for water cycle mechanism, are classified as the distributed model and the lumped model. Currently, the distributed models have been more widely used than lumped model for many researches and applications. The lumped model estimates the parameters in the conceptual and empirical sense, on the other hand, in the case of distributed model the first-guess value is estimated from the grid-based watershed characteristics and rainfall data. Therefore, the distributed model needs more detailed parameter adjustment in its calibration and also one should precisely understand the model parameters" characteristics and sensitivity. This study uses Jungnang basin as a study area and Vtlo™ model, which is a physics-based distributed hydrologic model, is used to analyze its parameters" sensitivity. To begin with, 100 years frequency-design rainfall is derived from Huff"s method for rainfall duration of 6 hours, then the discharge is simulated using the calibrated parameters of Vtlo™ model. As a result, hydraulic conductivity and overland"s roughness have an effect on runoff depth and peak discharge, respectively, while channel"s roughness have influence on travel time and peak discharge. |