含水層水文地質參數及邊界位置之推估

Estimation of Aquifer Parameters and Location of Boundary

張德鑫(Te-Hsing Chang) ； 三慧瑄(Hui-Hsuan San)

《農業工程學報》 57卷2期 (2011/06) Pp. 47-56

https://doi.org/10.29974/JTAE.201106.0004

摘要

地下水抽水試驗爲推估地層水文地質參數之現地試驗方法，根據Cooper-Jacob法及試驗所得時間－洩降關係，可推估大區域之水文地質參數，然而抽水試驗實際操作時常受到岩盤等邊界效應影響，使得在時間與－降關係圖中出現兩條不同斜率的直線。研究中雖可利用抽水－洩降理論公式，配合線性疊加理論推估觀測井與虛井之距離，但卻無法判定該邊界所在之方位。本研究建議可利用三口觀測井之抽水試驗數據，分別推估其邊界之距離進而研判出正確邊界位置。研究中本團隊以參與執行水利署水利規劃試驗所(2008)於馬祖東莒島進行之現地試驗爲基礎，配合抽水試驗及地質探勘等資料佐證其分析方法之可行，據以做爲往後相關抽水試驗規劃之參考。

關鍵字

抽水試驗 ； 水力傳導係數 ； 含水層邊界位置

並列摘要

Pumping test is one of the field tests to estimate hydro-geological parameters. Based on Cooper-Jacob method and the relation between time and drawdown, we can estimate the hydro-geological parameters in wide range. The time-drawdown diagram shows two straight lines with different slopes which were affected by boundary effect of rocks in pumping field test. The distance between the observation well and image well can be estimated by using the theoretical formula of pumping and drawdown, but it cannot spot the correct position of the boundary in this study. This study suggested to use the identical boundary distance data from three different observation wells to estimate correct boundary position. Our team participated in the field test plan in Dong-Ju Island of Water Resources Agency of Water Resources Planning Institute and demonstrated the analytical method of pumping test data and geological survey. This result could be the reference for the future study in the pumping test planning.

並列關鍵字

Pumping test ； Hydraulic conductivity ； Location of aquifer boundary