Simulation of the Groundwater flow in Guandu wetland

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Simulation of the Groundwater flow in Guandu wetland 關渡濕地地下水流動模擬 Adviser： Jui-Sheng Chen Presenter：Ting-Ya Yang

Simulation of the Groundwater flow in Guandu wetland 關渡濕地地下水流動模擬 Adviser： Jui-Sheng Chen Presenter：Ting-Ya Yang Date： 2010/11/18 2021/6/16 1

Outline Introduction Objective Materials and methods Study area Preliminary results Future Work 2021/6/16 2

Outline Introduction Objective Materials and methods Study area Preliminary results Future Work 2021/6/16 2

Introduction As concentration of Beitou geothermal spring water was up to 4. 32 mg/L

Introduction As concentration of Beitou geothermal spring water was up to 4. 32 mg/L Guideline of WHO (Taiwan) 0. 01 mg/L 3

objective Understanding of the transport and fate of arsenic in groundwater and wetland system

objective Understanding of the transport and fate of arsenic in groundwater and wetland system is of importance for evaluating its possible impacts and elucidating the role of the groundwater flow system on arsenic evolution of the wetland system. 4

GMS MODFLOW MT 3 DMS RT 3 D FEMWATE R SEEP 2 D NUFT

GMS MODFLOW MT 3 DMS RT 3 D FEMWATE R SEEP 2 D NUFT MODPATH SEAM 3 D 2021/6/16 7

MODFLOW (Modular three-dimensional groundwater flow model) Mc. Donald and Harbaugh (1988, 1996) Steady Transient

MODFLOW (Modular three-dimensional groundwater flow model) Mc. Donald and Harbaugh (1988, 1996) Steady Transient Confined aquifer Unconfined aquifer Anisotropic Heterogeneous 2021/6/16 8

Modflow- package River Well BCF General Head Basic Output control Recharge Time Head ET

Modflow- package River Well BCF General Head Basic Output control Recharge Time Head ET Drain 2021/6/16 9

Governing Equation is the component of the hydraulic conductivity tensor in the x direction.

Governing Equation is the component of the hydraulic conductivity tensor in the x direction. 【L/T】 is the component of the hydraulic conductivity tensor in the y direction. 【L/T】 is the component of the hydraulic conductivity tensor in the z direction. 【L/T】 is the volumetric flux per unit volume of sources and sinks of water. 【 1/T】 is the specific storage. 【 1/L】 h is the hydraulic head. 【L】 t is the time. 【T】 2021/6/16 10

研究區域 Study area 5 km Tamsui River 淡水河 5 km 地熱谷 Guandu wetland 2514

研究區域 Study area 5 km Tamsui River 淡水河 5 km 地熱谷 Guandu wetland 2514 m Keelung River 基隆河

Study area 地理位置及地質概況 Tamsui River 淡水河 Tuff breccia Wuchishan l地熱谷 Mushan Alluvium Guandu wetland

Study area 地理位置及地質概況 Tamsui River 淡水河 Tuff breccia Wuchishan l地熱谷 Mushan Alluvium Guandu wetland 關渡濕地 896 m Keelung River 基隆河

Preliminary results Parameter setting Model calibration： Root Mean Square Error (RMSE) 2021/6/16 15

Preliminary results Parameter setting Model calibration： Root Mean Square Error (RMSE) 2021/6/16 15

Preliminary results Parameter setting Model calibration： Root Mean Square Error (RMSE) 2021/6/16 16

Preliminary results Parameter setting Model calibration： Root Mean Square Error (RMSE) 2021/6/16 16

Future work u. Transient u. Model calibration and verification ： Root Mean Square Error

Future work u. Transient u. Model calibration and verification ： Root Mean Square Error (RMSE) 2021/6/16 17

Thanks for your attention 2021/6/16 18

Thanks for your attention 2021/6/16 18