三維地下水模式之發展與應用

Development and Application of a Three-Dimensional Groundwater Model

張正緯(Cheng-Wei Chang) ； 黃良雄(Liang-Hsiung Huang) ； 蔡東霖(Tung-Lin Tsai) ； 郭遠錦(Yuan-Ching Kuo)

《中國土木水利工程學刊》 21卷2期 (2009/06) Pp. 169-181

https://doi.org/10.6652/JoCICHE.200906_21(2).0005

摘要

本研究使用有限解析法及垂直分層技巧發展一套可根據地質分塊計算大範圍區域的有效率三維地下水模式，引入自由液面方程式，處理自由液面之非線性問題，並特別針對傳統非拘限含水層之自由液面計算準確性不佳之問題作進一步探討。本文利用具有解析解之抽水案例進行驗證，拘限或非拘限含水層水頭洩降模擬結果與解析解相當吻合，顯示本模式可合理模擬地下水流場且可處理較不易模擬的非拘限含水層問題。另外，由於開發交通設施，結構物因貫穿地下含水層，嚴重影響地下水流況；又如海堤道路角狀溝槽因颱風暴潮壓力波作用產生管湧現象，使路面遭受破壞。因此，本研究亦設計上述兩案例之概念模型以模擬之並提出有效改善對策，以供日後規劃設計之參考使用。

關鍵字

地下水流模式 ； 基樁 ； 管湧 ； 暴潮

並列摘要

In the present study, the horizontal finite analytic method and vertical integration technique are applied to develop a three dimensional groundwater computational model. The free surface equation is specifically used in this model to deal with the difficult, highly nonlinear free surface of unconfined groundwater flow. This model is capable of handling geological variation of large area computation efficiently. Well-pumpings with confined and unconfined aquifers are computed. The comparison of computational results and analytical solutions for both confined and unconfined aquifers reveals high accuracy of the present model. For problem of groundwater flow disturbed by foundation piles of rail-way and problem of levee road damage caused by groundwater piping when storm surge occurs, we design two conceptual models to investigate them. We also suggest a remedy by increasing the permeability of structures such as foundation pile and gutter.

並列關鍵字

groundwater model ； foundation pile ； piping ； surge wave