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Relationship between increment of groundwater level at the beginning of irrigation period and paddy filed area in the Tedori River Alluvial Fan Area, Japan

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Abstract

There are many paddy fields and large amounts of groundwater in the Tedori River Alluvial Fan in Ishikawa Prefecture, Japan. Water infiltration from paddy fields during irrigation may significantly contribute to groundwater recharge. Groundwater recharge is known to be one outcome of paddy farming, and in general is usually related to land use. However, a decreased area of paddy fields because of socioeconomic factors such as urbanization and increasing area of fallow fields has possibly affected the groundwater environment. Evaluation of the quantitative effect of paddy fields on groundwater is necessary for groundwater conservation. This study examined the relationship between differences in the depth of groundwater from just before the irrigation period to just after the first irrigation of paddy fields (increments of groundwater levels) in observation wells and the area of paddy fields around each well. The paddy areas within circular buffer zones, which were delineated at 0.2 km intervals between 0.2 and 2.0 km centered on each observation well, were calculated. A positive relationship was found between the rise in groundwater and the area of paddy field within different buffer zones at most wells. In addition, in the middle or upper part of the fan, the effect of changes in the area of paddy fields surrounding the well on the groundwater level rise was greater than that on the lower part of the fan.

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Acknowledgments

This research was supported by subsidy from the Ministry of Agriculture, Forestry and Fisheries of Japan entitled “The study on the normal hydrologic cycle in the Tedori River Alluvial Fan Areas as the core of irrigation water”. The authors would like to express thanks to the Ishikawa Prefectural government and Ishikawa Prefectural University for providing statistical datasets.

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Correspondence to Yumi Iwasaki.

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Iwasaki, Y., Ozaki, M., Nakamura, K. et al. Relationship between increment of groundwater level at the beginning of irrigation period and paddy filed area in the Tedori River Alluvial Fan Area, Japan. Paddy Water Environ 11, 551–558 (2013). https://doi.org/10.1007/s10333-012-0348-9

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  • DOI: https://doi.org/10.1007/s10333-012-0348-9

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