| Summary: | 碩士 === 國立臺北科技大學 === 環境規劃與管理研究所 === 91 === This paper intends to establish a mechanism by using Froude number to associate the relationship between flow types and fish habitats. In open channel hydraulics, Froude number, which contains two variables: water depth and water velocity, is extensively applied to describe flow type. To utilize single hydraulic variable as Froude number to simplify two variables, water depth and water velocity to describe the difference of flow types. The study sites were located in Dago Stream, Neihu district, Taipei City, Taiwan, with aim to find the confident intervals of fish habitat occurrence proportion and Froude number distribution in regular flow. After fieldwork in Dago stream, there are eight aboriginal fishes, however the Scaphesthes barbatulus and is excluded from this statistic due to the small sample sizes. The Hemibarbus labeo habitat was most likely to occur at lower Froude number class from 0.3 to 0.4. But the Monopterus albus was most likely to occur at higher Froude number class from 0.4 to 0.8. Zacco pachycephalus, Acrossocheilus paradoxus, Rhinogobius brunneus and Candidia barbata were extensively existed the range of Froude number between 0.3 to 1, but the optimum habitats of Rhinogobius brunneus and Candidia barbata appear from 0.8 to 1.1. These information can be applied to reconstructe an Environment of habitat heterogeneity and biodiversity which depends on changes of channel morphology when torrent control.
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