全流域即時動態洪水預報模式之研發與應用－以淡水河為例─總計畫暨子計畫：全流域河川洪水位即時動態模擬模式之研發(I)
Date Issued
2005
Date
2005
Author(s)
蔡丁貴
DOI
932625Z002015
Abstract
The purpose of this research project is to develop an accurate and reliable
basin-wide instant flood simulation model that can be used to accurately simulate the
flood movement in a compound-complex channel system. The model is capable of
forecasting water-surface elevations for all reaches to an appropriate future time level
based upon the requirements generally stipulated by flood forecasting agencies and to
provide such information for the use as flood and inundation warnings.
The project applies the unsteady flow theory and the associated governing
equations to develop the basin-wide river hydraulic model according to geometric
shapes and channel configurations of the river system. The equations are first
transformed to a set of characteristic equations, and are then numerically solved by the
multimode method of characteristic of the second kind (MMOC-Ⅱ), through which the
water surface elevations and flow rates at all reaches are obtained. The upstream and
downstream boundary conditions of the model are recorded water surface elevations
according to the requirements by the flood forecasting. The parameters of the model, i.e.,
the Manning’s roughness coefficients at all reaches, are assumed to be functions of
water depth.
The model system had seen its successful applications to several typhoons and
floods that took place in the Tamsui River Basin, such as Nock-ten and Haima. These
applications have amply proved the accuracy and practicality of the model.
Subjects
compound-complex channel system
flood forecasting
real-time simulation model
forecast simulation model
multimode method of characteristic
Publisher
臺北市：國立臺灣大學水工試驗所
Type
report
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