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- Title
Distributed Flood Simulations with Coupling Gauge Observations and Radar-rainfall Estimates.
- Authors
Dong-Sin Shih; Ming-Hsu Li; Ray-Shyan Wu
- Abstract
This study used a two-dimensional diffusion hydrodynamic model for the simulation of extreme flood events that occurred in the Shihmen reservoir watershed from 1989 to 2001. The alternating direction explicit scheme (ADE) with various horizontal spacings from 120 to 240 m at an incremental interval of 40 m was conducted for flood simulations. Spatial precipitation was provided by the gauge interpolations and weather radar rainfall estimate schemes. A case study, Typhoon Nari on September 16-18, 2001, was then performed using radar-derived rainfall with coupling two-dimensional diffusion hydrodynamic model in flood routing investigations. Numerical results revealed acceptable agreement between the observed and simulated reservoir stage hydrographs. Results of 120 and 160 m spacing had similar values on error indicators while the 160 m grids can greatly reduce computational time by 40% than that of 120 m grids. Precipitation is identified to be the main factor forcing model result.
- Subjects
DISTRIBUTED parameter systems; RADAR simulation; METEOROLOGICAL precipitation; RADAR in hydrology; FLOOD routing; RESERVOIR ecology; RESERVOIRS; HYDROGRAPHIC surveying; HYDRODYNAMICS; HYDROGRAPHY
- Publication
Water Resources Management, 2008, Vol 22, Issue 7, p843
- ISSN
0920-4741
- Publication type
Article
- DOI
10.1007/s11269-007-9195-7