蔡丁貴2006-07-252018-07-092006-07-252018-07-091998http://ntur.lib.ntu.edu.tw//handle/246246/2665本研究計畫之目的在於以實驗模擬潮汐對雙 相液體（海水與淡水）的地下含水層之影響，由於 潮汐之作用於海水入侵址部、淡海水交界面及地下 水自由液面位置及相位將產生變化，本計畫研究結 果可以作為理論解及數值解驗證之基礎。 本研究利用不相容的兩種液體使之產生一個 明顯交界面；假設非受壓含水層為均質、等向性且 完全飽和；含水層的傳導係數及儲水係數不隨管壓 水頭變化而有所改變；含水層厚度遠小於其水平之 長度和寬度；潮汐為一微小擾動，且交界面、自由 液面受潮汐之擾動亦很小。 基於上述假設，來從事實驗模擬，經由實驗可 獲得不同距離的自由液面水位、淡海水交界面位置 隨時間變化之情形，並經由計算得到地下水液面變 化與交界面變化之幅度與潮汐振幅之相對關係及 相位差。本實驗之量測數據可提供理論解析及數值 模式預測之依據，並應用至現場以提供沿海居民引 用地下水之參考。The objective of this proposed research is to experimentally study tidal effects on two–phase (freshwater and seawater) groundwater flows. The results of this research will provide measured data for verification of analytical and numerical solutions to movements of seawater intrusion toe, freshwater and seawater interface and free surface flu-ctuation in the aquifer. Two immiscible fluids are em-ployed to form a sharp interface in this proposed research. Unconfined aquifer is assumed homogenous, isotropic and saturated. Its conductivity and storage coefficient do not change with pressure head. The thickness of aquifer compared with its length and width is assumed small. Fluctuation of seawater intrusion toe, freshwater and seawater interface and groundwater free surface due to tidal effects is also assumed small. It is intended to obtain a relationship be-tween toe position, interface and free surface; and tides in term of amplitude amplification and phase lag. Results of this research will provide experimentally measured data to verify analytical solution and numerical results for further prediction of tidal effects. With meaningful verification analytical solu-tions and/or numerical results can then be applied to evaluate groundwater usage in coastal areas.application/pdf45784 bytesapplication/pdfzh-TW國立臺灣大學土木工程學系暨研究所潮汐自由液面淡海水交界面海水入侵址部TidesPhase lagFree surfaceSeawater and freshwater interfaceToe of seawater intrusion[SDGs]SDG6reporthttp://ntur.lib.ntu.edu.tw/bitstream/246246/2665/1/872211E002054.pdf