Estimating Land Use Impacts on Regional Scale Urban Water Balance and Groundwater Recharge |
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Authors: | Bin He Yi Wang Keiji Takase Goro Mouri Bam H N Razafindrabe |
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Affiliation: | (1) United Graduate School of Agricultural Sciences, Ehime University, Matsuyama 790-8566, Japan;(2) Faculty of Agriculture, Ehime University, Matsuyama 790-8566, Japan |
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Abstract: | Anthropogenic activities have exerted increasingly large-scale influences on terrestrial ecological systems from the past
century, primarily through agriculture; however, the impact of such changes on the hydrologic cycle is poorly understood.
As one of the important land use (LU) in the coastal Dogo Plain of the Seto Inland Sea, Japan, paddy fields have been decreasing
with the increase in urbanization in recent decades. As the main source of water in the Dogo Plain, groundwater plays an important
role in providing people with fresh water and contributing to stream base flow. The purpose of this study is to analyze the
water resource and evaluate the effect of LU change on groundwater table fluctuation in this coastal plain. Firstly, the observations
of groundwater table and the investigation of water balance were carried out in this alluvial plain. Then, a distributed four-block
three-layer water balance model was employed to analyze the groundwater table fluctuation with response to the change of paddy
field area. Moreover, the role of paddy field in recharging groundwater in the basin has been clarified. Results show that
groundwater table depends not only on rainfall and discharge from rivers, but also on irrigation water and topology of the
study area. The net groundwater recharge was positive in irrigation periods whereas that in non-irrigation periods was nearly
equal to zero or negative. The results of this study would be helpful to the urban development policy and land use planning
decision. |
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Keywords: | Land use change Paddy field Coastal plain Groundwater recharge |
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