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Rainfall‐Runoff Model for Typhoons Making Landfall in Taiwan 1
Author(s) -
Wu RayShyan,
Shih DongSin,
Chen ShihWen
Publication year - 2007
Publication title -
jawra journal of the american water resources association
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.957
H-Index - 105
eISSN - 1752-1688
pISSN - 1093-474X
DOI - 10.1111/j.1752-1688.2007.00079.x
Subject(s) - surface runoff , flash flood , typhoon , inflow , infiltration (hvac) , environmental science , watershed , hydrology (agriculture) , meteorology , soil science , flood myth , geology , computer science , geotechnical engineering , geography , ecology , archaeology , machine learning , biology
In this study, we examine a physical raster‐based distributed‐parameter flood simulation model combining one‐dimensional (1D) channel flow and two‐dimensional (2D) overland flow. Continuity equations based on the water budget concept and momentum equations based on Manning’s formula are included. The Shihmen reservoir watershed, situated in northern Taiwan, is selected as the study site, and data regarding the passage of Typhoons Xangsane [2000] and Nari [2001] are utilized to test the model. Comparative analysis shows that the description of the riverbed obtained by the gradient method is superior to that obtained by the GIS approach. This study suggests the Thiessen polygon method to interpolate spatial precipitation. The best calibrations are obtained at a spatial resolution of 160 m × 160 m, with a simulated time step of less than 5 s. The case study indicates that the proposed model has a good potential for inflow description, but does not accurately simulate the inflow amount. The proposed model is a flash reacting event‐based watershed model. To improve simulation accuracy, a good infiltration model and soil moisture model are needed, and their formulation could be our next task.