A STUDY ON HYPE MODEL APPLICATION CONSIDERING IMPERVIOUS SURFACE IN URBANIZED WATERSHED

Abstract

 To improve a precision of flow rate forecasting, water quantity model set-up in consideration of impervious surface is effective. In this study, flow rates forcasting calculated by a dynamic water quality and quantity model, HYPE model incorporating hydrological characteristics on impervious surface were verified. Firstly, a method to set up HYPE model by using a precise land cover data storaging impervious property named Urban Atlas was reviewed. Then, HYPE model were set up with a small and a large scale watersheds. Finally, model performance were evaluated by a comparison between model forcasting and flow rate observation. Evidences show that although proposed HYPE model could be applied water quantity forcasting regardless of catchment special size basically, it was shown that proposed HYPE model has a tendency to underestimate flood concentration time under heavy storm event.