Flood Runoff Simulation Using Grid-based Radar Rainfall and Vflo Model

초록

Flood disasters from localized heavy rainfall and flash floods have recently been an increasing trend in Korea. In order to reduce flood damage, it is important to observe and predict rainfall, which is an important hydrologic factor. Therefore, the use of radar rainfall data that can help the tracking of development and movement of rainfall's spatial distribution is drawing much attention in hydrology. When analyzing runoff in hydrology, grid-based distributed rainfall-runoff model (VfloTM) is increasingly used because it enables more detailed examinations of spatial flux changes in the basin as compared to existing lumped hydrologic models. Especially, the use of radar rainfall data that can create, correct, or forecast the rainfall data with short observation period and the physical-based distributed runoff model using GIS are increasing. It is expected that they will be very useful when estimating runoff in unobserved basins in the field of hydrology. Physical-based distributed model was first introduced by Freeze and Harlan (1969). Vieux, B. E. et al. (2004), who developed the Vflo model used in this study, evaluated the physical-based model for the application on flash floods; while Vieux, B. E and Koehler, E. (2005) studied the Vflo model using GIS. Kim Byeong-Sik et al. (2008) suggested a flood estimation method linked to radar rainfall data corrected by the distributed model and conditional integration method. They proved that the conditional integration method can actually be used in the interpretation of flood runoff.