Groundwater resources management under environmental constraints in Shiroishi of Saga plain, Japan |
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Authors: | Nguyen Cao Don Nguyen Thi Minh Hang Hiroyuki Araki Hiroyuki Yamanishi Kenichi Koga |
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Institution: | (1) Hydraulic Engineering Consultants I (HEC-1), Dong Da, Hanoi, Vietnam;(2) Graduate School of Science and Engineering, Saga University, Honjo 1, Saga-shi, Saga 840-8502, Japan;(3) Institute of Lowland Technology, Saga University, Honjo 1, Saga-shi, Saga 840-8502, Japan;(4) Department of Civil Engineering, Saga University, Honjo 1, Saga-shi, Saga 840-8502, Japan |
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Abstract: | A sinking of the land surface due to the pumping of groundwater has long been recognized as an environmental issue in the
Shiroishi plain of Saga, Japan. Land subsidence can have several negative economic and social implications such as changes
in groundwater and surface water flow patterns, restrictions on pumping in land subsidence prone areas, localized flooding,
failure of well casings as well as shearing of structures. To minimize such an environmental effect, groundwater management
should be considered in this area. In this study, a new integrated numerical model that integrates a three-dimensional numerical
groundwater flow model coupled with a one-dimensional soil consolidation model and a groundwater optimization model was developed
to simulate groundwater movement, to predict ground settlement and to search for optimal safe yield of groundwater without
violating physical, environmental and socio-economic constraints. It is found that groundwater levels in the aquifers greatly
vary from season to season in response to the varying climatic and pumping conditions. Consequently, land subsidence has occurred
rapidly throughout the area with the Shiroishi plain being the most prone. The predicted optimal safe yield of the pumping
amount is about 5 million m3. The study also suggests that pumping with this optimal amount will minimize the rate of land subsidence over the entire
area.
An erratum to this article can be found at |
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Keywords: | Coastal lowland Groundwater withdrawal Groundwater hydraulics Land subsidence Optimization model Optimal safe yield of groundwater Integrated management model Japan Kyushu Island Shiroishi in Saga lowland plain |
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