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研究生:王朝勤
研究生(外文):Chao-chin Wang
論文名稱:靜態渾水潭界面沉降與濃度剖面之實驗研究
論文名稱(外文):Experimental study on the relationship between concentration profile and zone settling in a stagnant muddy lake
指導教授:許少華許少華引用關係
指導教授(外文):Marko Hsu
學位類別:碩士
校院名稱:逢甲大學
系所名稱:水利工程所
學門:工程學門
學類:河海工程學類
論文種類:學術論文
論文出版年:2006
畢業學年度:94
語文別:中文
論文頁數:98
中文關鍵詞:水庫泥砂界面沉降渾水潭水庫淤積高濁度
外文關鍵詞:reservoir clayzone settlingmuddy lakehigh turbidityreservoir deposit
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本研究針對靜態渾水潭的沉降行為進行探討。以大型水箱及三種不同尺寸的沉降筒,並分別使用石門水庫淤泥、阿公店水庫淤泥、及美國高嶺土加水調配渾水,進行靜水沉降及濃度剖面的實驗。本研究發現,即使渾水起始濃度已達產生絮網之條件,但若水體中無正負離子存在,則亦無法產生絮網。有絮網產生,不代表必定有絮網等速段發生,起始濃度需在某一濃度以上,才會有絮網等速段發生。本研究實驗所得,石門水庫淤泥產生絮網的臨界起始濃度為25g/L,產生絮網等速段的起始濃度為60g/L,而淤泥沉降過程中,不分選沉降、不先行落淤的臨界起始濃度應於180g/L以上。沉降筒尺度方面,橫向尺度對於靜態渾水潭之界面沉降速度及濃度剖面影響皆不大;而垂向尺度對沉降之影響差別只在絮網等速段的延時長短,無論尺度大小為何,沉降歷線之趨勢皆相同。渾水等濃度層消失之時,即為絮網等速段之終點。
Settling behaviors of stagnant muddy lake is investigated in this study. A large-size water tank and three settling columns with different size were used as settling facilities. Three kinds of material, which including standard kaolin and clay sampled from Shimen reservoir and Agongdian reservoir, are used, respectively, to mix with water and become muddy water with different concentration as the experimental material. During an experiment the settling behaviors were recorded and concentration profiles at different time were taken. It is found that framework phenomena will not arise in the water without anion and cation, even if the initial concentration of the muddy water is higher than the critical concentration that framework occur. When framework arises, it is not necessarily that a concentration interval with uniform settling velocity occurs. Framework interval with uniform settling velocity can occur when the initial concentration is higher than a specific concentration. According to our experimental results, the minimum initial concentration which framework occurs for Shimen clay is 25g/L; and 60g/L is the minimum concentration for framework interval with uniform velocity occurs. The minimum initial concentration that muddy water settling without particle sorting and large particles do not settle first is 180g/L. For scale effects of settling column, lateral size do not affect the settling velocity and the concentration profile in the stagnant case. The effect of vertical scale on settling behavior is the duration of settling for framework interval with uniform velocity. No matter what size the settling column is, the trend of settling velocity curve is all the same. Once the layer with uniform concentration of muddy water disappears, the framework interval with uniform settling velocity comes to an end.
表目錄 V
圖目錄 VI
第一章、緒論 8
1-1渾水潭形成簡介 8
1-2研究動機及目的 8
第二章、文獻回顧 10
2-1微觀黏性泥砂的物理化學作用力 10
2-1.1水力黏滯阻力 10
2-1.2凡得瓦力 10
2-1.3雙電層斥力 11
2-1.4自然斥力 12
2-2黏性泥砂沉降特性 12
2-2.1黏性泥砂沉降速度 12
2-2.2黏性泥砂沉降速度級序 15
3-2.3細微顆粒的沉降與沉澱行為 18
2-3水庫泥砂運移簡介 18
2-3.1颱洪時期的三角洲淤積 18
2-3.2颱洪時期的異重流排砂與渾水潭排砂 19
2-4現地資料分析 21
第三章、靜水沉降實驗 22
3-1實驗目的 22
3-2實驗設計 23
3-2.1實驗設備 23
3-2.2預備實驗 24
3-2.3沉降實驗步驟 27
第四章、實驗結果與分析 30
4-1實驗結果 30
4-1.1標準沉降筒沉降實驗 30
4-1.2淤泥壓密實驗 32
4-1.3沉降筒尺度比較實驗 32
4-1.4濃度剖面實驗 34
4-1.5水質對沉降行之影響 35
4-2議題分析 36
4-2.1尺度影響 36
4-2.2淤泥沉降速度 37
4-2.3濃度剖面 37
第五章、結論與建議 40
5-1結論 40
5-2建議 42
參考文獻 44
附錄A、設備照片 87
附錄B、各水庫水質資料表 90
附錄C、排水管道與等濃度層之變化 95
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