| Summary: | 碩士 === 國立中央大學 === 土木工程研究所 === 95 === The river is one representative ecosystem in the natural environment. Therefore, to maintain the variety of habitat and species in the rivers becomes an important part of the river conservation. In this thesis, the research areas are Bei-nan creek and Go-pin creek in Taiwan. This study relies on a two-dimensional model, River2D, that simulates the change of the hydraulic characteristics and habitat types in the rivers, and reports quantitative description to the habitat environmental in Taiwan. Besides, the information on the Fish district of Taiwan is adapted to analyze water environment on the rivers. Finally, the relationship between the river types and habitat distribution it estimated.
The results show that the ecological base streamflow as Q75 has a various ecological environments in the habitat than that as Q95. The simulation of streamflow is performed until 300cms. It is shown that given the streamflow from 40cms to 100 cms in Bei-nan creek, four kinds of habitats from an average habitat proportion condition and habitats distribute relatively stabe. While in Go-pin creek, given the streamflow from 40cms to 150cms also result in a similar conclusion. In the other way, when the streamflow being 30cms in Bei-nan creek and and 60cms in Go-pin creek, it forms the most evenly proportion in four habitat categories, which provides adequate procreation and growing up for fish under the flow. In addition, for a braided river, riffle area has least percentage of the four kinds of habitats. The run habitat area increases with the flow at simulation. The condition remains steady when streamflow is less than 100cms.
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