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題 名 | Groundwater Flow in Deep Confined Aquifer Due to Tidal Effect=深層拘限含水層中受潮汐影響之地下水流 |
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作 者 | 劉格非; | 書刊名 | 力學 |
卷 期 | 11:2 1995.06[民84.06] |
頁 次 | 頁83-88 |
分類號 | 443.67 |
關鍵詞 | 地下水; 球形壓力區; Groundwater flow; Pressure bulb; |
語 文 | 英文(English) |
中文摘要 | 即使遠離海岸,河水水位變化也可因潮汐而變動很大。雖然河水滲漏到深層拘限 含水層的機率很小,但河水水位週期性的變化卻可因應力之傳遞而使深層地下水流動。我們 假設壓密時間尺度比地下水流時間尺度長很多來研究地下水之流動。應力在垂直方向之變化 被忽略後,我們研究因總應力而改變壓力水頭的簡化一維問題。 控制方程為線性擴散方程式加上時變外力項。經過拉普拉斯與傅利葉轉換,解答顯示壓力水 頭在空間之分佈類似錯誤函數。這種應力產生之地下水對淺層地下水沒有影響,同時結果顯 示壓力波峰首先顯現於離河較遠處。 |
英文摘要 | Water level variation in river can be large even far from coastline. For deep confined aquifer, the possibility of leakage from river is small. Nevertheless, the fluctuation of water elevation in river can cause stress change in soil below which in turn can induce groundwater flow. As the first step towards understanding this mechanism, the present study focuses on the effect of the fluctuation assuming time scale for consolidation is much larger than that of the groundwater. The vertical stress distribution is neglected. The total stress change in the confined aquifer affects the water pressure head through deformable soil medium. A simplified one dimensional problem with periodic total stress change and constant line pumping is examined. The governing equation is a linear diffusion equation with time varying forcing terms. Laplace transform and Fourier transform are invoked. The response distribution in space is of error function type. Therefore, space distribution of stress is smoother than that of the original. Since the governing equation is linear, extra pumping effect can be superimposed. The dynamic loading will not affect shallow layer groundwater flow. Also, peak pressure appears earlier for location further away. |
本系統中英文摘要資訊取自各篇刊載內容。