臺灣博碩士論文加值系統

本研究分別採用擬似三維與水深平均二維模式進行彎道汙染傳輸模擬，探討環流傳輸效應對側向傳輸的影響，其中擬似三維模式可利用解得的垂向流場與濃度場自動反應環流傳輸效應，水深平均二維模式則採用在梯度定理假設下所推導而得的Fischer等(1979)環流傳輸經驗公式來反應環流傳輸效應。本研究採用不符合梯度定理假設的Almquist and Holley(1985)連續彎汙染傳輸實驗案例進行模擬，分析不同環流傳輸效應模擬結果的差異性。

A quasi-3D model and a two-dimensional depth-averaged model are adapted in this study to analyze the circulatory-transport effect for the contaminant transport in open-channel bends. The quasi-3D model can provide the vertical velocity and contaminant profiles, so that the circulatory-transport effect can be computed automatically from theknown velocity defect. The two-dimensional depth- averaged model adopts Fischer et al. (1979) circulatory-transport formula, which was derived based on the gradient transport assumption, to empirically reflect the circulatory-transport effect. The contaminant transport test in a meandering channel reported by Almquist and Holley (1985), which does not conform to the gradient transport assumption, is adopted herein to evaluate the difference between the models.

誌謝 I
摘要 II
ABSTRACT III
目錄 IV
表目錄 VI
圖目錄 VII
符號表 IX
第一章 緒論 1
1.1 研究動機與方向 1
1.2 文獻回顧 1
1.3 研究目的與方法 2
第二章 理論基礎 3
2.1水理部分 3
2.1.1三維控制方程式 3
2.1.2水深平均二維控制方程式 5
2.1.3速度差異量方程式 6
2.1.4模式輔助關係式 8
2.1.5邊界條件 11
2.2汙染傳輸部分 12
2.2.1三維模式汙染傳輸方程式 12
2.2.2二維模式汙染傳輸方程式 13
2.2.3輔助關係式 13
2.2.4邊界條件 14
第三章 數值架構 17
3.1 水理部分 17
3.1.1求解架構 17
3.1.2數值差分法 20
3.2 汙染傳輸部分 22
3.2.1求解架構 22
3.2.2數值差分法 23
第四章 模式驗證 26
4.1 水理部分 26
4.2 汙染傳輸部分 35
第五章 側向傳輸係數效應探討 42
5.1側向環流傳輸通量之驗證 42
5.2側向環流傳輸係數之理論背景說明 48
5.3環流傳輸係數之影響評估 51
第六章 結論與建議 61
6.1 結論 61
6.2 建議 61
參考文獻 62

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