Modeling water balance for the small-forested watershed in Korea

Abstract

In this paper, the water balance of the 15-ha forested watershed in the southern part of Korea was evaluated to determine the model performance and the fractions of precipitation that become streamflow, evapotranspiration, and ground water flow. The BROOK90 model, a lumped hydrologic simulation model, was calibrated and used for the water balance analysis. Results showed that the model efficiency performance of r2 and Nash-Sutcliffe were fitted quite well over the observed and simulated streamflow values. The water balance investigation showed that about 46 percent of the annual precipitation released as evapotranspiration, 39 percent as streamflow, and 15 percent for the seepage loss. The BROOK90 model was significantly correlated as compared to the PART and WHAT system programs in terms of ground water flow simulation. In particular, it can be asserted that the partitioned amount of water varied from one component to another as affected by seasonal variations, canopy, soil, and drainage flow characteristics.