臺灣博碩士論文加值系統

本研究以動床試驗方式，探討不同入流量及岸壁坡度下，床型沖刷變遷對灘地崩塌時間與退縮距離之影響。岸壁試驗材料採用矽conducted砂與高嶺土混合之凝聚性土壤，底床試驗材料採用矽砂之非凝聚性土壤，以此鋪設方式類比真實河川的情況。此外，本研究透過謝(2003)所發展的二維水深平均RESED2D水理動床模式，並加入Arulanandan et al.(1980)之凝聚性岸壁沖刷經驗式及懸臂型岸壁之安全係數公式(姜,2011)，進行試驗案例之比對模擬分析。

In this study, a movable bed flume was set up. To make the conditions close to the natural rivers, the channel bank was paved with the cohesive material composed of the mixture of silica sand and kaolinite; the channel bed was paved with the noncohesive material of the silica sand. Several experimental cases with various inflows and angles of channel bank were conducted to investigate the influence of bed scouring to the time and distance of bank collapsing. Moreover, this study adopted a 2D Depth-Averaged Model (Hsieh, 2003) with adding bank scouring formula for cohesive material(Arulanandan et al., 1980) and safety factor of cantilever failure formula (Chiang, 2011) to simulate experiment cases. The simulation results were analyzed and compared with measured data.

誌謝 I
摘要 II
ABSTRACT III
目錄 IV
表目錄 VI
圖目錄 VII
照片目錄 IX
符號表 X
第一章 緒論 1
1.1 研究動機與目的 1
1.2 文獻回顧 1
1.3 研究方法 3
1.4 章節介紹 4
第二章 試驗案例設計 7
2.1 影響參數彙整分析 7
2.2 因次分析 10
2.3 案例設計 11
第三章 試驗規劃 14
3.1 試驗水槽及設備 14
3.2 試驗流程規劃 15
3.3 試驗材料製作 16
3.4 試驗動床段鋪設 17
3.5 試驗量測項目 17
第四章 試驗結果與討論 27
4.1 土壤基本參數分析 27
4.2 試驗現象說明 27
4.3 流速對河岸穩定之影響 28
4.4 底床變化對河岸穩定之影響 29
第五章 數值模式比對分析 53
5.1 理論基礎 53
5.1.1 水理動床計算 53
5.1.2 橫向沖刷計算 53
5.1.3 岸壁崩塌理論分析 54
5.2 模擬參數設定 54
5.3 模擬限制說明 55
5.4 臨界剪應力測試 56
5.5 格網配置測試 56
5.5.1 均勻格網測試 56
5.5.2 非均勻格網測試 56
第六章 結論與建議 60
6.1 結論 60
6.2 建議 61
參考文獻 62
附錄A 模式理論基礎 64
附錄B 模式數值方法 71

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