含水層水力傳導係數値現地試驗推估之研究

Estimation of the Hydraulic Conductivity by Using Field Test

三慧瑄(Hui-Hsuan San)

指導教授 ： 張德鑫

中原大學/工學院/土木工程研究所/碩士(2009年)

https://doi.org/10.6840/cycu200900934

摘要

Bouwer and Rice微水試驗推估法為求得水力傳導係數值方法之ㄧ，但其值為全鑽孔之綜合水力傳導係數，無法得知每一分層之水力傳導係數值。因含水層常有分層之現象，故本研究所探討之微水試驗是以Bouwer and Rice方法為主，目的為改善Bouwer and Rice方法中所求得之綜合水力傳導係數値，因該方法無法得知每一含水層之水力傳導係數值。本研究根據注水及回水因通水面積不同而得到兩個洩降-時間的關係式，將上述兩個洩降-時間之關係式聯立，以Newton-Raphson方法求得雙層含水層之水力傳導係數值。於完成試驗後，並且以東莒現地數據進行模式應用。最後本研究根據分層流通係數比値(T1/T2)不同之差異，針對參數進行敏感度分析，探討各參數之可檢定性。
另一種水力傳導係數値推估之現地試驗為抽水試驗，抽水試驗為大規模之試驗，可得到大範圍之水文地質參數，但抽水試驗易受到邊界效應影響，參數推估可根據Cooper-Jacob法，利用抽水試驗所得之數據繪出半對數圖進而求出其水文地質參數，但若抽水試驗遇到邊界效應時，在半對數圖中會得到兩條不同的直線。如僅有一口觀測井之數據時，此方法僅能得知觀測井與邊界之距離，無法確定其方位。為找出邊界之正確位置，故本研究建議可利用一口抽水井與兩口觀測井之數據來研判邊界之方位，並且以東莒所得之抽水試驗現地數據進行探討。

關鍵字

微水試驗 ； 水力傳導係數 ； 抽水試驗

並列摘要

Bouwer and Rice is one of the estimation methods of slug test of obtaining the hydraulic conductivity, but it’s a synthetic value of fully drilling, do not know the hydraulic conductivity of each layers. Because of the phenomenon of the delaminated aquifer, so the Bouwer and Rice is the main method discussed in this research that purpose improving the synthetic value, because that can’t know the values of each layers. This research was based on the different circulating area of the recharge and recovery to get two formulas, use Newton-Raphson method to obtain the hydraulic conductivity values in double-layers aquifer. After verification we use the data of Dong Ju to apply to this model. According to the different ratio of transmissivity to discuss the variance, and execute the sensitivity analysis of the parameters to discuss the identifiability.
Pumping test is another field test that estimating the hydraulic conductivity, it’s a large scale test that can get the hydro-geological parameters of wide range. Pumping test effected by boundary easily, according to Cooper-Jacob method, use the data of pumping test to draft the semi-log graph and obtain the hydro-geological parameters. When the pumping test encountered the boundary effect, the graph will show two different lines. If there is only one observation data, this method only knew the distance between the observation and boundary. In order to find the location of the boundary, we suggest using the data of one pumping well and two observations to determine the position of boundary, using the pumping test data of Dong Ju to discuss it.

並列關鍵字

hydraulic conductivity ； pumping test ； slug test

參考文獻

3. Cooper H. H., J. D. Bredehodft, and I. S. Papadopulos, “Response of a finite-diameter well to an instantaneous charge of water,” Water Resources. Research, Vol.3, No. 1, pp. 263-269, 1967.

4. Bouwer, H. and R. C. Rice, “A slug test for determining hydraulic conductivity of unconfined aquifers with completely or partially penetrating wells,” Water Resources Res., Vol. 12, pp. 423-428, 1976.

5. Dagan, G., “A note no packer, slug, and recovery tests in unconfined aquifers, Water Resources Research, Vol. 14, No. 5, 1978.

6. Binkhorst, G. K. and G. A. Robbins, “Conducting and interpreting slug test in monitoring wells eith partially submerged screens,” Ground Water, Vol. 36, No.2, 1998.

8. Bredehoeft, J. D., H. H. Cooper Jr., and I. S. Papadopulos, “Inertial and storage effects in well-aquifer system: An analog investigation,” Water Resources Research, Vol. 2, No. 4, pp. 697-707, 1966.