博碩士論文 946204003 詳細資訊




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姓名 江政昌(Zheng-Chang Jiang)  查詢紙本館藏   畢業系所 應用地質研究所
論文名稱 漸近型式尺度延散度之一維移流-延散方程式之Laplace轉換級數解
(An Laplace transform power series solution to generalizedadvection-dispersion equation with asymptotic distance-dependent dispersivity)
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摘要(中) 為了描述溶質在地表底下的傳輸行為,數學上常用移流-延散方程式描述控制移流和水力延散傳輸的物理機制。在延散傳輸的理論中,延散度是量測溶質分散的重要的參數。傳統數學模式預測溶質傳輸,多採用常數延散度。然而,現地研究指出延散度並非常數,而是會隨溶質傳輸的距離增加而改變,且在長距離時漸近常數。本研究中,考慮溶質傳輸問題發生於有限長度的孔隙介質中,並考慮延散度隨距離增加而趨近一常數。本研究以Laplace轉換級數方法解析漸近形式的尺度延散度之移流-延散方程式。發展之解析解與數值解進行濃度穿透曲線比較以檢驗其正確性,比較的結果顯示,在不同觀測位置的濃度穿透曲線,解析解與數值解十分吻合。然而,解析解於極限延散度小而特徵半展距大時,在小時間無法進行數值計算。此外,藉由分析解析解函數的數學行為,可了解無法進行數值計算的困難之處。
摘要(英) To describe solute transport in a subsurface porous medium, the advection-dispersion equation is widely used to mathematically describe the physical processes governing advective and hydrodynamic dispersive transport. In the theory of dispersive transport, dispersivity is an important parameter for the measurement of the spreading of solute. Classical mathematical models for predicting solute transport are based on advection-dispersion equation with space-invariant dispersivity. However, field study indicated that dispersivity is not constant but generally increases with solute transport distance, and becomes asymptotically constant at large distance. In this study, a solute transport problem in a finite porous medium where the dispersion process depends on distance and increases up to some constant limiting value is considered. The Laplace transform power series technique is applied to analytically solve the advection-dispersion equation with asymptotic distance-dependent dispersivity. The developed analytical solution is compared to the numerical solution to examine its accuracy. Results shows that the breakthrough curve at different observation points from the power series solution have good agreements with those from the numerical solution. However, the solution can not been numerically computed at the early time when the asymptotic dispersivity is small and the characteristic length is large. In addition, the mathematical behaviors of the developed solution functions are analyzed to address the difficulty in numerical computation.
關鍵字(中) ★ Laplace轉換級數解
★ 漸近型式尺度延散度
★ 移流-延散方程式
關鍵字(英) ★ Laplace transform power series solution
★ asymptotic distance-dependent dispersivity
★ advection-dispersion equation
論文目次 目錄............................................................................................................................i
圖目錄.......................................................................................................................ii
表目錄......................................................................................................................iv
符號說明...................................................................................................................v
第一章 緒論.............................................................................................................1
1.1 前言................................................................................................................1
1.2 文獻回顧........................................................................................................4
1.3 研究目的........................................................................................................6
1.4 研究方法........................................................................................................6
第二章 數學模式.....................................................................................................7
2.1 移流-延散方程式建立...................................................................................7
2.1.1 延散機制介紹.........................................................................................7
2.1.2 推導一維溶質傳輸方程.......................................................................10
2.2 發展一維漸近型尺度延散度之移流-延散方程.........................................14
2.3 利用Laplace轉換級數法求解....................................................................18
第三章 結果與討論...............................................................................................24
3.1 數學模式驗證..............................................................................................24
3.2 函數數學行為探討......................................................................................25
3.3 尺度延散與常數延散比較.........................................................26
第四章 結論...........................................................................................................65
參考文獻.................................................................................................................66
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指導教授 陳瑞昇(Jui-Shen Chen) 審核日期 2007-7-23
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