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A GIS‐ASSISTED DISTRIBUTED WATERSHED MODEL FOR SIMULATING FLOODING AND INUNDATION 1
Author(s) -
Chang TsangJung,
Hsu MingHsi,
Teng WeiHsien,
Huang ChenJia
Publication year - 2000
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.1752-1688.2000.tb05703.x
Subject(s) - kinematic wave , flow routing , routing (electronic design automation) , hydrology (agriculture) , flooding (psychology) , hydrograph , watershed , floodplain , alluvial plain , watershed area , alluvium , geology , channel (broadcasting) , storm , environmental science , flood myth , geomorphology , surface runoff , geotechnical engineering , engineering , computer science , telecommunications , geography , computer network , psychotherapist , ecology , oceanography , archaeology , biology , psychology , paleontology , machine learning , cartography
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 discharge 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.