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論文中文名稱:草溝曼寧糙度之推估 [以論文名稱查詢館藏系統]
論文英文名稱:Estimation of Retardance Coefficient [以論文名稱查詢館藏系統]
院校名稱:臺北科技大學
學院名稱:工程學院
系所名稱:土木與防災研究所
中文姓名:詹又寧
英文姓名:You-Ning Chan
研究生學號:94428016
學位類別:碩士
語文別:中文
口試日期:2007-06-25
論文頁數:74
指導教授中文名:陳彥璋
口試委員中文名:林鎮洋;楊翰宗
中文關鍵詞:水生植物阻滯係數福祿數流場流速分佈
英文關鍵詞:Plantsretardance coefficientFroude numberthe flow fieldVelocity distribution
論文中文摘要:在天然溪流環境裡,水生植物扮演的角色並非只是純粹的生產者,水生植物之種類、大小、植栽密度與生長位置都深深影響周邊水文狀況,因此本實驗分別選擇了挺水性(水芹菜)與沉水性(水蘊草)兩種型態之水生植物,來瞭解水生植物調控水文條件的機制。本實驗係採用聲波都卜勒測速儀(Acoustic Doppler Velocimete,簡稱ADV)進行植栽渠道流場之研究。隨著實驗中變因之不同,可獲得不同之水生植物植株高、水深比與阻滯係數(retardance coefficient)、福祿數(Froude number)等資料,並根據植栽配置密度不同、不同植栽與水深比,形成不同糙度與流量間之關係,透過該兩種水生植物所設計建立之實驗,能瞭解水生植物對於流場之影響。
本實驗主要分析項目:植栽種類、植栽密度、流量、與流速剖面之討論,以及植栽密度、水深對曼寧糙度之關係,並將實驗分析成果配合阻滯係數與流速、水力半徑乘積(n-VR)之曲線在工程上之應用,並探討曼寧糙度與福祿數間(n/R1/6-Fr)之關係曲線,以推估渠道之粗糙度。
論文英文摘要:The Acoustic Doppler Velocimete (ADV) was adopted in this experimental study on investigate the characteristics of the open channel flow over a smooth boundary which was growed aquatic plant. The experiment uses the flume to establish the biology parameters for two kinds of aquatic plant and flow parameter. The biology parameters include aquatic plant loading angle, Density of aquatic plant, Ratio of aquatic plant height and water depth, aquatic plant retardance coefficient. The flow parameters include Froude number and Manning’s coefficient.
The objectives of this research were to study the different vegetation, density of vegetation and the relation between water gauge and Manning roughness. In addition, the results of the experiment can be use to estimation the roughness of the channel.
論文目次:中文摘要 i
英文摘要 ii
誌謝 iii
目錄 iv
圖目錄 vi
表目錄 ix
第一章 緒論 1
1.1 研究動機 1
1.2 研究目的 2
1.3 論文架構簡介 2
第二章 文獻回顧 4
2.1 明渠流的一般特性 4
2.1.1 明渠流動的分類方式 4
2.1.2 黏滯力與慣性力的相對效應 4
2.1.3 重力與慣性力的相對效應 5
2.2 流速分佈 6
2.2.1 平均流速分佈 6
2.2.2 流體在光滑或粗糙表面 7
2.2.3 流層的分類 7
2.3 渠道粗糙係數之計算 9
2.3.1 流體能量損失 10
2.3.2 植物對渠道之影響 12
2.3.3 水生植物渠道與水理參數及阻滯係數之關係 15
第三章 實驗設備及研究方法 24
3.1 實驗設備與材料 24
3.1.1 實驗水槽 24
3.1.2 ADV系統 25
3.1.3 實驗植栽之選定 27
3.2 實驗方法 30
3.2.1 實驗步驟 32
3.2.2 實驗佈置 37
第四章 實驗結果與分析 39
4.1 植栽渠道流速分佈 40
4.1.1 流速剖面 40
4.1.2 兩種植栽流速剖面之比較 46
4.2 水生植物渠道與水理參數間之關係 48
4.2.1 植栽密度與阻滯係數n值之關係 48
4.2.2 水深與阻滯係數n值之關係 50
4.3 阻滯係數n值與VR 53
4.4 阻滯係數n值與Fr 55
第五章 阻滯係數之應用 58
5.1 n-VR曲線於工程上之應用 58
5.2 n/R1/6-Fr曲線於工程上之應用 62
第六章 結論與建議 66
6.1 結論 66
6.2 建議 68
參考文獻 69
符號說明 73
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論文全文使用權限:同意授權於2009-08-27起公開