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題 名 | 地層下陷之理論探討=Theoretical Investigation on Land Subsidence |
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作 者 | 施清吉; | 書刊名 | 農業工程學報 |
卷 期 | 43:2 1997.06[民86.06] |
頁 次 | 頁1-10 |
分類號 | 443.67 |
關鍵詞 | 地層下陷; 地下水; Land subsidence; Groundwater; |
語 文 | 中文(Chinese) |
中文摘要 | 假設地層下陷僅來自垂直方向的壓密,而地下水流動同時也限制於與其垂直的平 面,則自飽和含水層超抽地下水的地層下陷之過程可分為前階段與後階段,分別為正在抽水 當中與停止抽水;而一個階段又分成直角座標系統與極座標系統等兩種。除了後階段極座標 系統的分析解外,其餘的都非常合理。 分析解包含兩個參數:一是擴散係數 Do,其值介於 10-4 至 10 �� (ft �� /sec) 之間,另一是抽水係數 No,約為 10-3。無因次空間自 1 到 20,000,而無因次時間自 10 至 10 �縑A其值約半年。 |
英文摘要 | It is assumed that the land subsidence due to an overdraft of groundwater from a confined saturated aquifer is strictly resulted from a vertical settlement and the groundwater flow is also restricted to a plane motion only. the course of the land subsidence can then be devided into two consecutive stages, the earlier stage denoting with pumping and the later stage representing after pumping; for each stage two different coordinate systems are considered in this study, the cartisan and the cylindrical coordinates systems. Thus, four different cases are theoretically investigated. Except for the case of the later stage in the cylindrical coordinate the analytical solution of the other three cases are quite reasonable as long as the tendency and the distribution of the solution are concerned. Solutions consist of two parameters: one is the diffusivity Do ranging from 10-4 to 10 (ft �� /sec), and the other is the socalled pumping coefficient No with a value of 10-3. The dimensionless distance varies from 1 to 20,000 approximatly, while the dimensionless time starts with a value of 10 up to 10000000, which is about half year. |
本系統中英文摘要資訊取自各篇刊載內容。