Quantification of the effect of rice paddy area changes on recharging groundwater |
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| Authors: | Mitsumasa Anan Kozue Yuge Yoshisuke Nakano Satiant Saptomo Tomokazu Haraguchi |
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| Institution: | (1) Takasaki Sogo Consultant Co. Ltd., 3-7-5 Higashiaikawa, Kurume-Shi Fukuoka, 839-0809, Japan;(2) Faculty of Agriculture, Kyushu University, 6-10-1 Hakozaki, Higashi-Ku, Fukuoka-Shi Fukuoka, 812-8581, Japan;(3) Faculty of Agricultural Technology, Bogor Agricultural University, Kampus IPB Darmaga, Bogor, 16680, Indonesia;(4) Faculty of Agriculture, Saga University, Honjo-cho, Saga-Shi Saga, 840-8502, Japan |
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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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| Keywords: | Numerical model GIS application Land use condition Groundwater storage Return flow to river |
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