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Slug-Test Improvement Use to Hydraulic Conductivity Estimation of Unconsolidated Porous Media in Double-layer Aquifer
微水試驗方法改進應用於雙層含水層之非固結孔隙介質水力傳導係數估算
摘要
The Slug-Test has been used for the hydraulic conductivity K estimation by Bouwer and Rice (1976) in a single-layer aquifer. However, the hydraulic conductivity still needs improvement for the multi-layer aquifer. This study adopts both injection and recovery Slug-Tests incorporating to obtain the time-drawdown relationship of unconsolidated porous media in the double-layer aquifer and receives the solution of the hydraulic conductivities. Where the Newton-Raphson Method is applied to solve the simultaneous equations and calculate the hydraulic conductivities in the double-layer aquifer system. The results show that the parameters have a better calibration according to the sensitivity analysis with various ratios of transmissivity (T_1/T_2) of the double-layer. The Slut-Test improvement in the double-layer aquifer is applied to estimate the field hydraulic conductivity in Dong-Ju Island, where the formation of the upper aquifer is weathering sandstone and the lower aquifer is weathering granite. The results appearing correlation coefficient with R^2=0.997 for injection test and R^2=0.950 for recovery test. Therefore, the application reveals the factuality and practicability of the model corresponding to the field test data.
並列摘要
Bouwer and Rice（1976）利用微水試驗針對單層含水層的水力傳導度K進行估算，然而，對於多層含水層的水力傳導度解析仍有需改進。本研究透過微水測試注水試驗井洩降變化與抽水試驗井回復變化獲得雙層含水層中非固結孔隙介質水力傳導率K的解析以及井水位洩降（井水位回復）隨時間變化的關係，採用Newton-Raphson法求解聯立方程即可獲得雙層含水層系統的水力傳導度K。考慮雙層含水層在不同透水度比（T_1/T_2）的情境透過敏感度分析獲得良好的率定成果。本研究將理論應用在金門地區東莒島現地雙層含水層，進行上層含水層（砂岩風化層）和下層含水層（花崗岩風化層）的水力傳導度估算。最後，計算本研究雙層含水層模式水位洩降分析成果與現地量測成果的相關係數，注水試驗井水位洩降趨勢比較可達相關係數R^2=0.997，抽水試驗井水位回復則相關係數R^2=0.950，研究成果與現地量測數據可獲得驗證。