李鴻源臺灣大學：土木工程學研究所游蕙綾2007-11-252018-07-092007-11-252018-07-092004http://ntur.lib.ntu.edu.tw//handle/246246/50106一般工程的考量，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—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謝誌 i 摘要 ii 目錄 iv 圖目錄 vi 表目錄 viii 附圖目錄 ix 附表目錄 ix 第一章 緒論 1 壹､研究緣起 1 貳､研究動機 2 參､研究目的 3 肆､ 論文架構簡介 4 第二章 文獻回顧 5 壹､生態工法的定義與沿革 5 貳､丁壩工的設置原則 6 參､棲地相關研究 8 一､物理棲地型態 8 二､河川生態與棲地相關研究 11 肆､台灣魚類特性 13 第三章 研究方法 16 壹､擬似二維水理輸砂演算模式簡介 16 貳､二維水理輸砂演算模式 21 一､模式簡介 21 二､模式上游邊界與下游邊界之處理 27 三､模式計算可得之結果 28 參､評估丁壩工對魚類棲地之影響 28 一､標的物種的選定 28 二､棲地模式 29 第四章 案例研究 31 壹､研究區域簡介 31 貳､模式參數的估算 32 一､參數設定 32 二､模式銜接 38 參､魚類適合度曲線 38 肆､棲地型態 39 第五章 結果分析與討論 41 壹､無因次分析 41 貳､洪汛時期模擬 42 一､迴歸公式 43 二､丁壩後區網格探討 46 參､常流量模擬 48 一､定床模擬 48 二、動床模擬 50 肆､季節變化與潮汐影響 52 一､季節變化 52 二､潮汐影響 57 第六章 結論與建議 59 壹､結論 59 貳､建議 63 參考文獻 65 圖 70 表 971505884 bytesapplication/pdfen-US魚類棲地數值模擬丁壩工fish habitat improvementWUAnumerical modelspur dikesthesishttp://ntur.lib.ntu.edu.tw/bitstream/246246/50106/1/ntu-93-R91521303-1.pdf