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Quantification of the effect of rice paddy area changes on recharging groundwater

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Abstract

This study quantifies the effects of paddy irrigation water on groundwater recharge. A numerical model of groundwater flow was conducted using MODFLOW in a 600 ha study site in an alluvial plain along the Chikugo River, located in southwestern Japan. To specify the surface boundary condition, data on the land use condition stored in the GIS database were transferred into a numerical model of groundwater flow. The simulated results were consistent with the observed yearly changes of groundwater level. Thus, it was appropriate to use the model to simulate the effects of paddy irrigation on groundwater. To quantify these effects, the groundwater level was simulated during the irrigation period when all farmlands in the study site were ponded. In this situation, the groundwater level was 0.5 to 1.0 m higher, the ground water storage 20% larger, and the return flow of the groundwater to the river 50% larger than in the present land use condition.

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Acknowledgements

The authors express their deep appreciation to the project staff of the Ministry of Agriculture, Forestry, and Fisheries of Japan for their cooperation.

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Correspondence to Mitsumasa Anan.

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Anan, M., Yuge, K., Nakano, Y. et al. Quantification of the effect of rice paddy area changes on recharging groundwater. Paddy Water Environ 5, 41–47 (2007). https://doi.org/10.1007/s10333-006-0059-1

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  • DOI: https://doi.org/10.1007/s10333-006-0059-1

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