丁壩工對感潮河口魚類棲地面積影響之研究

游蕙綾(Hui-Ling Yu)

指導教授 ： 李鴻源

國立臺灣大學/工學院/土木工程學研究所/碩士(2004年)

https://doi.org/10.6342/NTU.2004.02030

摘要

一般工程的考量，多以洪汛時期為主，但水生物棲地需求的考量，則是常流量下的水環境（各種水理微棲地，如：潭、湍、瀨等），因此，本文針對標的物種—

關鍵字

魚類棲地 ； 數值模擬 ； 丁壩工

並列摘要

Generally, flooding period is the most important time to be considered in the aspect of engineering designs. But in terms of habitats (for example: pool, riffle, run), flow conditions under normal discharge period are more important for the habitat of aquatic species.
In this study, by selecting Gobioidi, Cyprinidae and Homalopteridae as the indicator species, the change of fish habitat in two different kinds of period (flooding & normal discharge period) and the hydraulic diversity in the normal discharge period are discussed.
In addition, the changes of different types of habitats with time and the influences of tides are also analyzed.
A quasi-two-dimensional model, NETSTARS, and a horizontal two-dimensional model, TABS-2, were employed to simulate the hydraulic characteristics of the Lanyang Estuary in the presence and absence of the constructed spur dikes. Both fixed-bed and mobile-bed conditions were investigated.
In the flooding period, installing spur dikes will increase the slow-velocity area that can enlarge the hide area for fish. The effects of sediment transport in the mobile case show that increased sediment deposition would reduce fish habitat area, a finding that is integral to effective long-term habitat management.
On the other hand, the results in the normal discharge period show the fish habitat area will increase without the build of spur dikes. If the flooding risks are not taken into account, the simulation provided the fish habitat area will expand with the less number and the shorter length of spur dikes. But installing spur dikes will increase the hydraulic diversity.
Key words：numerical model, spur dikes, WUA, fish habitat improvement

並列關鍵字

fish habitat improvement ； WUA ； numerical model ； spur dikes

參考文獻

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