利用雙封塞微水試驗推估裂隙含水層水力傳導係數

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林雅停(Ya-ting Lin) 查詢紙本館藏

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應用地質研究所

論文名稱

利用雙封塞微水試驗推估裂隙含水層水力傳導係數
(Estimation of Hydraulic Conductivity of Fractured aquifer Using Double Packer Slug Test)

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摘要(中)

裂隙含水層中進行水力試驗時，地下水流場之水流維度(flow dimension)可能不是一維(單向)、二維(徑向)或三維(球狀)情況，而是分數維度，須由碎形幾何的概念來討論。新竹尖石裂隙含水層場址進行雙封塞微水試驗(double packer slug test，DPT)，獲得具定常振盪週期和固定振幅比的振盪反應，與高滲透顆粒性含水層微水試驗的振盪反應有相同特徵，屬二維徑向流情況。又因DPT的初始壓差較小(<0.5 m)，不影響低滲透性岩體母質的水壓，故DPT資料分析簡化為單孔隙率(僅考慮裂隙中水壓變化)、二維徑向流、類穩態(quasi-stead-state)模式，成功地分析DPT資料。一般的DPT 並無觀測井水位記錄，本研究則在執行DPT時，於測試井鄰近的觀測井量測水位變化。發現觀測井水位亦呈現振盪反應，但振幅較小，週期較長。因地下水流入(出)測試井時，地下水流出(入)觀測井，故測試井與觀測井的水位振盪存有相位差。目前尚無合適模式可分析觀測井的水位振盪。未來將發展觀測井振盪水位資料之分析模式，以便與測試井資料分析對比，提升裂隙含水層水文地質的瞭解。

摘要(英)

The dimension of the groundwater flow field associated with a hydraulic test in a fractured formation may not be one-dimensional (uniform)、two-dimensional (radial) or three-dimensional (spherical). Instead, the flow dimension may be fractional, representative of certain fractal geometry. The oscillatory response of double-packer slug tests in the fractured formation in Jianshi county have constant periods and constant amplitude ratio, satisfying the characteristics of a two-dimensional radial flow condition. Because the initial pressure water pressure in the fracture can be likely neglected without introducing significant error. As a result, data analysis of DPT can be simplified using a single porosity (fracture only)、two-dimensional radial flow and quasi-stead-state model. Successful results are obtained using this modeling approach. Moreover, water level measured at an observation well close to the tested well of the DPT exhibits oscillatory response with smaller amplitudes and shorter periods. There is a phase lag between the oscillatory response from the tested well and the observation well, indicating that when groundwater flowed into (out) the observation well, the groundwater flowed out (in) the test well. So far, there has no suitable model for analyzing the oscillation of water level in observation well, and thus the future study should focus on the development of a DPT model that can be used to analyze the oscillatory response from the observation well in a fractured formation.

關鍵字(中)

★ 雙封塞微水試驗
★ 裂隙含水層
★ 水力傳導係數

關鍵字(英)

★ Double Packer Slug Test
★ Hydraulic Conductivity
★ Fractured aquifer

論文目次

中文提要 i
英文提要 ii
誌謝 iii
目錄 iv
圖目錄 vi
表目錄 xi
符號說明 xii
第一章背景與研究目的 1
1.1背景 1
1.2研究目的 9
第二章不同形狀因子的比較 10
2.1 各模式形狀因子模式介紹 10
2.2 各模式形狀因子的比較及討論 31
第三章實驗場址介紹與雙封塞微水試驗資料分析方法 34
3.1實驗場址介紹 34
3.2 雙封塞微水試驗流程 34
3.3 雙封塞微水試驗資料分析方法 38
3.3.1 振盪反應分析方法 38
3.3.2 非振盪反應分析方法 42
第四章雙封塞微水試驗資料分析與結果 46
4.1地下水流維度整數與非整數之討論 46
4.2雙封塞微水試驗之資料 48
4.3測試井雙封塞微水試驗資料分析結果 48
4.4觀測井雙封塞微水試驗資料定性分析結果 72
第五章結論與建議 84
5.1結論 84
5.2建議 84
參考文獻 87

參考文獻

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指導教授

陳家洵(Chia-shyun Chen)

審核日期

2009-7-17

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