Two Phase Flow and Solute Transport in Randomly Heterogeneous soils

• Main Authors: Chen Guan-Zhi, 陳冠志
• Other Authors: Lee Cheng-Haw
• Format: Others
• Language: zh-TW
• Published: 2001
• Online Access: http://ndltd.ncl.edu.tw/handle/11261030763053087727

碩士 === 國立成功大學 === 資源工程研究所 === 89 === A stochastic approach was proposed to investigate the effect of the heterogeneous soil on groundwater flow and solute transport in both saturated and unsaturated zones. By combining the Turning Bands method and a multi-phase transport code TOUGH2(Pruess, 1991), the simulation of the solute transport and risk analysis was automatically performed. The approach is applied to the district of the Institute of Nuclear Energy Research. Results indicate that the saturated hydraulic conductivity, recharge rate and porosity are the most important factors on the solute transport. Besides, the arrival time of stochastic simulations is slower than that of deterministic approach in both saturated and unsaturated zones. Result of Risk analysis shows that the groundwater may be polluted in 104th day with low possibility, but will be polluted in 119th day with 0.8 probability. ABSTRACT II 誌謝 III 目錄 IV 表目錄 VII 圖目錄 VIII 符號表 XI 第一章 緒論 1 1-1 研究動機與目的 1 1-2 前人研究與背景 2 1-3 研究方法與流程 7 第二章 溶質傳輸相關理論 9 2-1 前言 9 2-2 溶質傳輸的物理機制 9 2-3 溶質傳輸之連續方程式 12 第三章 模擬溶質傳輸模式之建立 16 3-1 TOUGH2模式之理論與架構 16 3-2 TOUGH2模式之數值方法 19 3-3 序率模擬理論 22 3-3-1 序率過程 22 3-3-2 Turning Bands法 24 第四章 敏感性分析 27 4-1 前言 27 4-2 各項水力參數對穩態水頭分佈之影響 27 4-2-1 單相流與二相流 30 4-2-2 飽和透水係數 32 4-2-3 孔隙率 36 4-2-4 入滲率 37 4-2-5 地下水面深度 40 4-2-6 飽和層水力梯度 43 4-3 各項水力參數對溶質傳輸之敏感性分析 45 4-3-1 飽和透水係數 46 4-3-2 孔隙率 48 4-3-3 入滲率 50 4-3-4 地下水面深度 52 4-3-5 飽和層水力梯度 54 第五章 現場案例模擬 57 5-1 前言 57 5-2 研究區概述 57 5-3 水力參數相關試驗與分析 59 5-3-1 定水頭試驗 60 5-3-2 離心機試驗 61 5-4 現場案例之模擬 65 5-4-1 背景資料與參數 65 5-4-2 Turning Bands模擬 66 5-4-3 定率模擬之結果 73 5-4-4 序率模擬之結果 74 5-4-5 風險性評估 77 第六章 結論與建議 84 6-1 結論 84 6-2 建議 86 參考文獻 87 附錄 A 單相流與二相流未飽和含水量關係之推導 91 附錄 B 核能研究所現地採樣點之van Genuchten模式持水曲線 92 附錄 C 定率及序率模擬之一維穩態飽和水流達西定律推導 114