Inundation models for pa-chang creek basin in taiwan

Abstract

This chapter discusses two inundation models, namely, two-dimensional (2D) finite difference model and cell inundation model. The simulated results by 2D finite difference model have good accuracy; however, this model is not satisfactory for urgent forecasting as used in flood warning system due to its long simulation time. The cell model has been developed to simulate the inundation within the limited preforecasting time. The advantage of this model is the capability of precisely reflecting the geometry of the study area and the ground surface resistance. The chapter calibrates many parameters of the cell model in accordance with the simulated results of the 2D finite difference model, and performs two case studies for verification. The cell model is then applied to the simulations of inundation in Pa-Chang Creek Basin, Taiwan. The simulated results reveal that cell model is both efficient and accurate. The computational time needed by the cell model is approximately 1/26 of that needed by the 2D finite difference model.