Numerical study of salinity variation in a coastal aquifer: a case study of the Motooka region in western Japan |
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| Authors: | E D P Perera K Jinno A Tsutsumi Y Hiroshiro |
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| Institution: | (1) Institute of Environmental Systems, Graduate School of Engineering, Kyushu University, 744 Motooka, Nishi-Ku, Fukuoka 819-0395, Japan;(2) S. G. Gijutsu Consultant Co. Ltd, 4-18-25, Kounonishi, Saga, Japan |
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| Abstract: | The Motooka region in the Fukuoka prefecture in western Japan is a coastal area, where groundwater is utilized as the main
water resource for greenhouse agriculture and domestic use. Over-exploitation of groundwater has resulted in seawater intrusion
and thus in the contamination of the freshwater aquifer. Fluctuations in electric conductivities caused by such intrusion
are a crucial problem, since even slight changes in electric conductivities of the water used for agricultural purposes significantly
affect the crops’ growth and yield. However, no study has thus far been conducted on the electric conductivity fluctuations
caused by groundwater pumping and seasonal recharge of groundwater in the Motooka region. To this end, an attempt is made
in the present study to develop a numerical variable-density solute transport model and then apply it to simulate the electric
conductivity fluctuations with groundwater pumping and rainwater recharge. This model is developed under a finite difference
scheme, and the method of characteristics is used as the numerical technique for solving the advection term of the advection–dispersion
solute transport equation. The results from this numerical model are compared with the field measurements. |
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