透過您的圖書館登入
IP:54.152.77.92
  • 學位論文

植生分佈及密度對深水型人工溼地水力效率及水流型態影響之研究

Hydraulic Efficiency Calculation and Related Flow Pattern Configuration of Vegetated Deep Constructed Wetlands

指導教授 : 許銘熙
共同指導教授 : 張倉榮(Tsang-Jung Chang)
若您是本文的作者,可授權文章由華藝線上圖書館中協助推廣。

摘要


近年來,人工溼地常應用於汙水處理,而處理汙染物的效率與溼地內的流況以及停留時間有相當程度的關聯,因此本研究模擬現地製作模型,選用 Rhod-WT 作為追蹤劑進行模型追蹤劑試驗,獲得停留時間分佈,計算其水力效率,進而探討各種擺放物對於流況之影響,為了改善水力效率,比較挺水障礙物、沉水障礙物、高低密度仿挺水性植生+沉水障礙物,共設計了52 組追蹤劑試驗。 為有效提升深水型人工溼地之水力效率,本研究主要以改變障礙物的擺放方式、數量和長度,並分析挺水障礙物、沉水障礙物以及高低密度仿挺水性植生+沉水障礙物的改善效率差異。障礙物依照擺放方向不同、改變數量及長度設計12種擺放方式,首先,在相同水深和流量下,比較挺水障礙物和沉水障礙物之水力效率改善情形,研究結果發現,在未發生短路流狀況下,挺水障礙物之水力效率改善效果明顯優於沉水障礙物;為求提升沉水型障礙物之水力效率改善效果,在沉水障礙物上設置仿挺水性植物,依照植生密度分為低密度仿植生和高密度仿植生,研究結果顯示,高密度仿挺水性植生+沉水障礙物之水力效率改善效果皆優於低密度仿挺水性植生+沉水障礙物,而在某些情形下,仿挺水性植生+沉水障礙物之水力效率改善效果會優於挺水障礙物,本研究比較挺水障礙物、沉水障礙物、高低密度仿挺水性植生+沉水障礙物,找出各擺放方式的較佳改善方法。

並列摘要


Recently, the constructed wetland (CW) often used in sewage treatment. Artificailly constructed wetlands offer a low-cost treatment to remove some pollutants found in effluent water from industry, agriculture, and urban areas. The treatment efficiency strongly depends on flow pattern and residence times of the flow condition. This study thus presents a laboratory tracer experiment to estimate wetland residence time distributions and hydraulic efficiency, and use rhodamine-WT as the tracer. In order to improve hydraulic efficiency, 53 experiments are designed to test the improvement efficiency with different number, length and allocation of obstructions by laboratory model experiment. To improve the hydraulic efficiency of deep water constructed wetland, this study changes the obstruction placed in the direction, the number and length, and analyze the improvement of hydraulic efficiency from emergent obstructions, submerged obstructions and different density emergent vegetation on submerged obstructions. In accordance with the obstruction placed in a different direction, number and length ,12 allocations are designed. First, at the same depth and flow, compare the improvement of hydraulic efficiency between emergent obstructions and submerged obstructions. The results show that, without short-circuit current situation, the emergent obstructions of improving hydraulic efficiency is better than submerged obstructions. To enhance the hydraulic efficiency improvement of submerged obstructions, set emergent vegetationnt on submerged obstructions. Results show that the hydraulic efficiency improvement effect of high-density emergent vegetation on submerged obstructions are superior to low-density emergent vegetation on submerged obstructions. In some cases, hydraulic efficiency improvement effect of high-density emergent vegetation on submerged obstructions will be better than emergent obstructions. This study compared the emergent obstacles, submerged obstructions, high and low density emergent vegetation on submerged obstructions, to find better ways to improve the hydraulic efficiency in different allocations.

參考文獻


40. 李瑋婷,2014,深水型人工溼地水力效率改善之研析,國立臺灣大學生物環境系統工程所碩士論文。
44. 郭品含,2008,水質處理型滯洪溼地之最佳化設計研究,國立臺灣大學土木工程研究所碩士論文。
48. 蘇宗敏,2007,表面流人工溼地水力效率之研究,國立臺灣大學土木工程研究所碩士論文。
45. 曾芸琦,2014,埤塘型濕地之追蹤劑試驗及水力效率改善研究,國立臺灣大學土木工程研究所碩士論文。
1. Bastviken, K.S., Weisner, S.E.B., Thiere, G., Svensson, J.M., Ehde, P.M., Tonderski, K.S., (2009). Effects of vegetation and hydraulic load on seasonal nitrate removal in treatment wetlands. Ecol. Eng. 35, 946-952.

延伸閱讀