Benefit Assessment of Cut-off Wall Implementation in Daping Groundwater Reservoir

Abstract:

Groundwater reservoirs aim at saving grounding water from aquifers by means of interception and adjustment. This study adopts numerical model simulation to evaluate the benefit of developing subsurface reservoirs and provides the case of the groundwater reservoir development at Daping region in Dongju Island. Since 2008, this study has been conducting surface geological surveys, geological drilling, surface infiltration experiments, physical experiments on bore specimens, and continuous observation of groundwater level while simultaneously conducting water pumping and slug tests in the field in order to estimate the hydro geological parameters of the site. The development benefit assessment of the groundwater reservoir will also include catchment area, surface land use, calendar year rainfall records and other information. Meanwhile, the FEMWATER numerical model of groundwater will be used to conduct hydrodynamic simulations of the development area. According to the simulation results of pre and post construction of the cut-off wall of the groundwater reservoir, this study could estimate the stable pre and post water volume and the development benefit of the groundwater reservoir can be assessed. According the 3-year unsteady numerical simulation, the results show that the groundwater reservoir can provide approximately 36 m3/day of stable water supply during dry seasons. If a cut-off wall is implemented and the stable water supply could increase 11% to 40 m3/day and raise the average upstream groundwater level of the cut-off wall by 1m, it clearly displays the benefit of the cut-off wall.

• Periodical: Applied Mechanics and Materials (Volumes 256-259)
• Pages: 2577-2582
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.256-259.2577
• Online since: December 2012
• Authors: Te Hsing Chang, Ning Chien Tung, Fu Ming Chang
• Keywords: Cut-Off Wall, Groundwater Reservoir, Numerical Simulation

References

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[6] Yeh, G.T., "FEMWATER: A Three-Dimensional Finite Element Model of WATER Flow through Saturated-Unsaturated Media", ORNL-6386, Oak Ridge National Laboratory, Oak Ridge, Tenn., (1987).

DOI: 10.2172/5998824