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題 名 | 水平集水管河畔取水對河川滲漏及地下水位影響之研究=Study of River Seepage and Groundwater Level Change Cased by Horizontal Collecting Well Pumping Near Riverbank |
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作 者 | 洪智勇; 陳忠偉; 梁勝淵; 謝壎煌; 李振誥; 丁澈士; 杜永昌; | 書刊名 | 農業工程學報 |
卷 期 | 56:2 2010.06[民99.06] |
頁 次 | 頁71-82 |
分類號 | 445.2 |
關鍵詞 | 河畔取水; 水平集水管; MODFLOW; Pumping near riverbank; Horizontal collecting well; |
語 文 | 中文(Chinese) |
中文摘要 | 由於台灣近年每逢颱風來襲所夾帶之豪大雨,屢屢造成供水系統之原水濁度飆高,遠超出淨水場可處理能力,因此建立穩定且永續之供水備援系統實刻不容緩。淺層含水層因同時具有降雨、河川與地下水側向補注等來源,以河畔取水形式可於豐水期取得乾淨水源,枯水期可截留部分伏流水,且經由土層之入滲過濾,可降低河川水污染物及細菌濃度,為可行之開發或備援水源方案。 本研究利用Joshi(1988)解析模式驗證MODFLOW應用於模擬水平集水管河畔取水之適用性,由研究結果顯示解析解與數值解驗證結果良好,表示數值模式可模擬具備各種水文條件之現場情況。 利用數值模式進行水平集水管形式之敏感性分析,並以濁水溪北岸與竹塘地區為例提出合適設置方案。由研究分析結果顯示,建議方案為沿濁水溪北岸設置6口,單井出水量為7,404 CMD之4 m寬口輻射井,井徑2 m之水平集水管由寬口井往外延伸10 m,地下水位洩降量符合下限水位標準,洩降影響範圍至600 m外之住宅區僅約0.2至0.3 m。 |
英文摘要 | Taiwan is hit by typhoons along with torrential rains in recent years, the raw water for the water system would usually rise to a level of high turbidity, far beyond the capacity of the water purification station. Therefore, it is of great urgency to establish a steady and sustainable water supply backup system. The shallow aquifer is sourced by rains, rivers, and groundwater side recharge. By pumping near the riverbank, it is able to obtain clean water in wetting season and also intercept part of the groundwater during the drying season. Furthermore, the seepage on the soil stratum as well as the seepage is able to decrease the contamination and bacterial concentration of the water from rivers. Thus, it can be considered as a developable backup water supply program. To evaluate the applicability of MODFLOW being used for all hydrological variations on the site, the study makes use the Joshi(1988) analytical models to verify its applicability. According to the research results, the analytical solution and the numerical solution have shown good verification results. This indicates that the MODFLOW can simulate the on-site situation under all kinds of hydrological conditions. The sensitivity analysis for the horizontal collection well form is undertaken for the water supplying program design. The water source development building horizontal collection wells along the north bank of the Zhuoshui River and Zhutang Area. Based on the analysis of the research, the proposal is to build 6 horizontal collection wells, each with a water yield of 7,404 CMD, 4 m well diameter, with horizontal collection wells 2 m in length reaching 10 m from the wells. The simulation results indicate that the groundwater drawdown is in accordance with the lower limit standard. Furthermore, the drawdown affects the residential areas situated 600 m away between the degrees of 0.2 to 0.3 m. |
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