查詢結果分析
相關文獻
- 以共變異函數探討抽水作用引起之倒轉現象
- Dynamic Response of a Spinning Disk Coupled with a Moving Beam System Subjected to Impulsive Excitation
- 中藥(材)中微量元素之檢驗方法及規格研訂2.--植物性中藥(材)中微量元素(銅、汞、鎘、鉛、砷、鈷、錳)檢驗方法及規格研訂之研究
- Probe-Tube Microphone Measures of Real Ear Coupler Difference in Chinese Adults and Children
- 抗極化褪變之寬頻光纖水中聽音器之設計
- 臨床牙科口內直接式數位型放射線攝影術之使用
- CCD影像感測器之動作原理與應用電路
- ICP-MS的基本原理
- ICP-MS與管柱層析的連線技術及其在生物醫學上的應用
- ICP-MS樣品輸入技術及其在環境與生物樣品中微量元素分析之應用
頁籤選單縮合
題 名 | 以共變異函數探討抽水作用引起之倒轉現象=Using Covariance Function to Investigate the Reverse Phenomena under Groundwater Pumping |
---|---|
作 者 | 王士榮; 徐國錦; | 書刊名 | 農業工程學報 |
卷 期 | 58:3 2012.09[民101.09] |
頁 次 | 頁80-92 |
分類號 | 443.67 |
關鍵詞 | 倒轉現象; 地下水抽水; 序率孔彈性理論; 共變異函數; 耦合; Revcrse phenomenon; Groundwater pumping; Stochastic poroelastic model; Covariance function; Couple system; |
語 文 | 中文(Chinese) |
中文摘要 | 水井抽水或停抽引致土層中水壓在短時間內與地下水流概念相反之行為,稱之 為水壓之倒轉行為,分別以Noordbergum 與Rhade 效應稱之。倒轉行為之發生主要 來自於土體的應力傳遞速度與水體流動速度差異之交互作用所引起,可以使用耦合 孔彈性理論來解釋。倒轉行為的作用機制為土體與水體的交互作用所引起,因此, 本文使用一階二動差序率方法,建構一維度序率孔彈性理論模式,從二階統計量的 觀點來探討Noordbergum 與Rhade 效應的倒轉現象。研究結果顯示,共變異函數比 位移與水壓之平均值,更容易觀察到土水耦合關係中的倒轉現象,且使用一維度序 率孔彈性模式即可觀測到土水交互作用的倒轉行為。較小之水力傳導係數與楊氏模 數較容易引起倒轉現象,且倒轉行為之發生與時間及空間之尺度有關。本研究為倒 轉行為首次在一維度模式中預測出來,並首次使用二階統計量進行倒轉行為分析, 而倒轉行為可用來了解土水交互作用之機制並可修正抽水或注水試驗時之參數推求結果。 |
英文摘要 | The reverse behavior caused by a groundwater pumping was observed in the field for decades. The mechanism is believed in the difference of the propagation velocity between mechanic pass and fluid flow under a coupled system. This coupled behavior can be well described by the poroelastic theory. In the physical viewpoint, the reverse behavior indicates an anomaly relationship between displacement and pore pressure, and it can be, theoretically, explained by the covariance function of displacement and pore pressure.Therefore, a stochastic approach called the first-order second-moment (FOSM) method is adopted to construct a stochastic poroelastic model. The second moment solution is used to describe the reverse behavior of Noordbergum and Rhade effects. This is the first time to use a one-dimensional stochastic poroelastic model to explain the reverse phenomena. The results show that the one-dimensional FOSM stochastic poroelastic model can easily detect the reverse phenomena under both a constant discharge and a sudden stop of discharge conditions. The reverse phenomena are dominant under a small hydraulic conductivity and Young’s modulus and depend on both the spatial and temporal scales. The results also imply that one-dimensional poroelastic model under a constant discharge condition could be a coupled system. The proposed FOSM method provides an approach to detect the reverse phenomena under discharge conditions. This phenomenon can be used in parameter inverse in the pumping test. |
本系統中英文摘要資訊取自各篇刊載內容。