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Title: Assessment of factors influencing groundwater-level change using groundwater flow simulation, considering vertical infiltration from rice-planted and crop-rotated paddy fields in Japan
Authors: Iwasaki, Yumi
Nakamura, Kimihito  kyouindb  KAKEN_id  orcid https://orcid.org/0000-0003-4357-7187 (unconfirmed)
Horino, Haruhiko
Kawashima, Shigeto  kyouindb  KAKEN_id
Author's alias: 岩﨑, 有美
川島, 茂人
Keywords: Groundwater recharge/water budget
Paddy field
HYDRUS-1D
MODFLOW
Japan
Issue Date: Dec-2014
Publisher: Springer Berlin Heidelberg
Journal title: Hydrogeology Journal
Volume: 22
Issue: 8
Start page: 1841
End page: 1855
Abstract: Assessing factors that influence groundwater levels such as land use and pumping strategy, is essential to adequately manage groundwater resources. A transient numerical model for groundwater flow with infiltration was developed for the Tedori River alluvial fan (140 km2), Japan. The main water input into the groundwater body in this area is irrigation water, which is significantly influenced by land use, namely paddy and upland fields. The proposed model consists of two models, a one-dimensional (1-D) unsaturated-zone water flow model (HYDRUS-1D) for estimating groundwater recharge and a 3-D groundwater flow model (MODFLOW). Numerical simulation of groundwater flow from October 1975 to November 2009 was performed to validate the model. Simulation revealed seasonal groundwater level fluctuations, affected by paddy irrigation management. However, computational accuracy was limited by the spatiotemporal data resolution of the groundwater use. Both annual groundwater levels and recharge during the irrigation periods from 1975 to 2009 showed long-term decreasing trends. With the decline in rice-planted paddy field area, groundwater recharge cumulatively decreased to 61 % of the peak in 1977. A paddy-upland crop-rotation system could decrease groundwater recharge to 73–98 % relative to no crop rotation.
Rights: The final publication is available at Springer via http://dx.doi.org/10.1007/s10040-014-1171-8.
許諾条件により本文ファイルは2016-01-01に公開.
This is not the published version. Please cite only the published version.
この論文は出版社版でありません。引用の際には出版社版をご確認ご利用ください。
URI: http://hdl.handle.net/2433/199679
DOI(Published Version): 10.1007/s10040-014-1171-8
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