Quantification of the effect of rice paddy area changes on recharging groundwater
Quantification of the effect of rice paddy area changes on recharging groundwater
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DOI：
10.1007/s10333-006-0059-1
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发表时间：
2007-01
影响因子：
2.2
通讯作者：
Mitsumasa Anan;K. Yuge;Y. Nakano;S. Saptomo;Tomokazu Haraguchi
中科院分区：
文献类型：
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作者：
Mitsumasa Anan;K. Yuge;Y. Nakano;S. Saptomo;Tomokazu Haraguchi
本研究量化了水稻灌溉水对地下水补给的影响。使用 MODFLOW 在日本西南部筑后川沿岸冲积平原 600 公顷的研究地点建立了地下水流数值模型。为了指定地表边界条件，GIS 数据库中存储的土地利用条件数据被转换为地下水流数值模型。模拟结果与观测的地下水位逐年变化相一致。因此，用该模型来模拟水稻灌溉对地下水的影响是合适的。为了量化这些影响，模拟了灌溉期间研究地点所有农田都积水的地下水位。在此情况下，地下水位比现有土地利用条件高出0.5至1.0m，地下水储量增加20%，地下水返回河流的流量增加50%。
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.