Study on the Characteristics of Regional Groundwater and Land Subsidence Problems in Coastal Regions

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Project title

Code/計畫編號

MOST103-2621-M019-004

Translated Name/計畫中文名

氣候變遷下海岸地區發展與海洋變遷互動之研究-沿岸地區地下水與地層下陷特性研究(I)

Project Coordinator/計畫主持人

Cheng-Yu Ku

Funding Organization/主管機關

National Science and Technology Council

Department/Unit

Department of Harbor and River Engineering

Website

https://www.grb.gov.tw/search/planDetail?id=8355972

Year

2014

Start date/計畫起

01-08-2014

Expected Completion/計畫迄

31-07-2015

Bugetid/研究經費

681千元

ResearchField/研究領域

環境科學
土木水利工程

自1960年代起，臺灣沿海地區因超抽地下水，因而產生地層下陷之現象，若地層持續下陷，將進一步影響基礎設施，因此有必要針對地層下陷之現象進行進一步探討，以維持臺灣地下水資源之永續性。為解決上述之工程問題，本研究發展互層土壤之地層下陷數值模式，並根據Terzaghi理論及Biot理論，以進行非耦合方程式及耦合方程式之求解，利用有限差分法理論，以離散化控制方程式，再藉由數值方法求解之。於Terzaghi 理論中，求解一維之互層土壤問題，於互層土壤交界處，需加以考量壓力水頭連續及流量守恆；於Biot理論中，則需同時考慮通量守恆和應力連續，以處理互層土壤交界處之連續性。本研究藉由數值案例以驗證數值解之精確性，並將其結果與解析解進行比較之。研究結果顯示，本研究之方法於處理病態系統時，除了能提升收斂精度外，亦具備數值計算穩定之能力，本模式未來將可應用於求解更複雜之地層下陷工程問題。 "Since 1960‘s, the land subsidence in the coastal region is gradually occurred in over-pumping areas. The consequence of the continued land subsidence becomes country‘s major problems. Accordingly, it is necessary to study this land subsidence problem and to promote the sustainable use of land and resources. To resolve the problems mentioned above, this study presents the development of a land subsidence numerical model for multi-aquifer system. The uncoupled and coupled models based on the Terzaghi theory and Biot theory were adopted in this study, respectively. The numerical solutions of consolidation problems in layered soil using the finite difference method were proposed. For the Terzaghi model, the flux conservation and continuity of pressure potential at the interface between two consecutive layers are considered in the numerical model to solve one-dimensional consolidation problems in layered soil profiles. On the other hand, the flux conservation and continuity of stress at the interface between two consecutive layers are considered for the Biot model. The validity of the model is established for a number of test problems by comparing numerical results with the analytical solutions. The results show that the proposed method can improve the convergence and can increase the numerical stability for solving consolidation problems in layered soil. It is expected that the proposed model can be used to apply for more sophisticated consolidation problems in layered soil in the near future."

Keyword(s)

地下水
地層下陷
多層含水層
數值分析
沿岸地區
groundwater
land subsidence
multi-aquifer
numerical analysis
coastal region

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Study on the Characteristics of Regional Groundwater and Land Subsidence Problems in Coastal Regions

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