期刊
JOURNAL OF THE AMERICAN WATER RESOURCES ASSOCIATION
卷 36, 期 5, 页码 975-988出版社
AMER WATER RESOURCES ASSOC
DOI: 10.1111/j.1752-1688.2000.tb05703.x
关键词
flooding; inundation; diffusive overland-flow routing; dynamic channel-flow routing; distributed watershed model; surface water hydrology; Taiwan High Speed Rail
A distributed watershed model combining kinematic wave routing, 1-D dynamic channel-flow routing, and 2-D diffusive overland-flow routing has been developed to simulate flooding and inundation levels of large watersheds. The study watershed was linked to a GIS database and was divided into an upstream mountainous area and a downstream alluvial plain. A kinematic wave routing was adopted at the mountainous area to compute the dlischarge flowing into the alluvial plain. A 1-D dynamic channel routing solving the St. Venant equations by the Preissmann method was performed for the main channel of the alluvial plain, whereas a 2-D overland-flow routing solving the diffusion wave equation with the Alternating Direction Explicit scheme was used for floodplains. The above two routings were connected by weir-link discharge formula. The parameters in the model were calibrated and independently verified by single-event storms. An example application of flooding/inundation analysis was conducted for the Taichung station and the Woozi depot (Taiwan High Speed Rail). Suggested inundation-proofing measures - including raising ground surface elevation of the station and depot and building a waterproofing exterior wall and their combination - were investigated. It was concluded that building the waterproofing exterior wall had a strong tendency to decrease peak inundation depth.
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