| Summary: | 碩士 === 國立交通大學 === 土木工程系所 === 94 === This study is based on the non-uniform sediment multimode characteristics model developed by Li(1992) and Yeh et al.(1995). The proposed model is a coupled model, in which along the physical perturbation-wave trajectories the N bed-meterial size fractions, flow depth, velocity, and bed elevation can be solved simultaneous. In order to apply to the natural rivers system , expand this model to the function that has simulation the confluence flows, and consider the question of the inside boundary condition , the concept of adopting the water level and is equal to is dealt with. This research is connected clearly with professor Yen et al. (1988 , 1990 ) experiment case first, carry on single channel simulation and susceptibility analysis. In mobile-bed confluence flows model application , regard natural rivers as the target of simulation , collect the section data of Tahan river and Sanxia river , regard Tahan river as the mainstream, and Sanxia river as the tributary, carry on typhoon flood incident simulation, and compare with the measuring value
of the Hsinhai bridge water level station, examine this model suitability in the natural rivers.
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