Experimental and Numerical Simulation Studies on the Influence of Groundwater Management and Ground Level Disturbance on Subsurface Water Cycle and Land Subsidence and Liquefaction(II)

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Project title

Code/計畫編號

MOST109-2625-M019-002

Translated Name/計畫中文名

地下水資源管理對水文地質災害與城市缺水之多目標災害風險調控 - 以臺北盆地為例-都會區地下水資源調控與地表變動對地層下陷與淺層地下水循環的影響分析(子計畫五)(II)

Project Coordinator/計畫主持人

Yung-Chia Chiu

Funding Organization/主管機關

National Science and Technology Council

Co-Investigator(s)/共同執行人

羅偉誠
許少瑜

Department/Unit

Institute of Earth Sciences

Website

https://www.grb.gov.tw/search/planDetail?id=13532366

Year

2020

Start date/計畫起

01-08-2020

Expected Completion/計畫迄

31-07-2021

Bugetid/研究經費

805千元

ResearchField/研究領域

防災工程

水文循環過程乃水資源管理最核心的自然機制，其中，地下水資源管理更是與地表下水循環過程息息相關。影響地表下水循環因子包含地表水與地下水的交互作用、地層結構以及水文地質條件的改變。而近百年來，人類活動已經對於地表下水循環與水文地質狀態造成顯著的影響。其中，地層下陷就是因人類活動干擾地下水循環所引發的重大地質災害之一，並且近期全球尺度研究顯示超抽地下水對生態基流量有顯著的影響。另一方面，位於地震帶的臺灣在地下水水位過高或高土壤含水量的區域，極易因地震事件而引發土壤液化顯示為防治地質災害地下水資源的管理是不可或缺的。本計畫擬以臺北盆地為研究區域，針對臺北都會區非侷限含水層中，非飽和與飽和層土壤之水分移動，進行現地尺度數值模擬。透過多重物理耦合的COMSOL數值模式，模擬地表水與地下水之互動、地表降水、人為活動以及地下水的抽取與補注對於地層結構與水文地質條件所造成的影響。模擬結果將提供總計畫與其他子計畫所需的水文地質物理參數變動情境與機制，同時利用各子計畫回饋的地下水資源管理策略，進行模擬與預測，進而透過地下水管理達成水文地質與都會區水文災害多目標風險調控的目的。本計畫亦將同時進行相關的孔彈性（ poroelasticity）基礎物理實驗，驗證 Terzaghi原理、Biot理論、Bishop理論與數值模式所需的基本參數，以及對於地層下陷物理機制的探討。透過孔彈性基礎物理實驗，將能了解飽和與非飽和地下水孔隙水壓變化下所連帶引發的孔隙率、滲透係數與地層的時空形變；並包含以下陷或表層變位發生過程之土壤結構性、土壤強度變化、以及孔隙流體傳輸現象的理論與模式驗證期望能系統性掌握地下水水位與下陷的時空變化關係。本計畫目前已經完成使用Modflow與 Comsol建立數值模型，模擬抽水造成的地下水孔隙水壓變化，並耦合多孔介質模組算出地層形變、孔隙率及水力傳導係數。Water resource management is the activity crossing over the different scale of both time and space and involves weather, hydrology, economics, geological setting, and policy. The subsurface hydrological cycle, which is affected by surface hydrology, geological conditions, and artificial groundwater pumping and recharge, plays a key role in groundwater resource management. Improper groundwater resource management can lead to multiple geological disasters. Land subsidence is a consequence of groundwater over-exploitation, that also has a remarkably impact on environmental flow in recent global-scale research. Nevertheless, a high groundwater level increases the potential of soil liquefaction. We proposed a series of physical experiments and numerical simulations to investigate the interactions between the groundwater exploitation and land subsidence in Taipei Basin. The numerical simulation based on COMSOL Multiphysics software will be performed to understand the temporal and spatial effects of the human activity and surface-subsurface water interaction on the land subsidence. The results will provide the hydrogeological information to the primary and other linked projects. In addition, we will perform experiments to investigate the poroelasticity theories, such as Terzaghi’s principle, Biot theory, and Bishop’s proposition, and explore the mechanism of land subsidence to figure out the pore fluid and the soil particle under varied soil conditions. Now, we have already built the numerical model by Modflow and Comsol, and simulated the pore water pressure, strata deformation, porosity changes and hydraulic parameter change caused by pumping.

Keyword(s)

孔彈性理論
地表下水循環
Biot理論
COMSOL
Poroelasticity
Terzaghi's principle
Biot theory
Bishop's proposition

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Experimental and Numerical Simulation Studies on the Influence of Groundwater Management and Ground Level Disturbance on Subsurface Water Cycle and Land Subsidence and Liquefaction(II)

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