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Estimate of river seepage by conditioning downward groundwater flow in the Toyohira River alluvial fan, Japan

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Title: Estimate of river seepage by conditioning downward groundwater flow in the Toyohira River alluvial fan, Japan
Authors: Sakata, Yoshitaka Browse this author
Baran, Gur Browse this author
Suzuki, Teruhiko Browse this author
Chikita, Kazuhisa A. Browse this author →KAKEN DB
Keywords: groundwater
river seepage
numerical simulation
aquifer modelling
water budget
alluvial fan
Issue Date: Jul-2016
Publisher: Taylor & Francis
Journal Title: Hydrological sciences journal
Journal Title(alt): Journal des sciences hydrologiques
Volume: 61
Issue: 7
Start Page: 1280
End Page: 1290
Publisher DOI: 10.1080/02626667.2015.1125481
Abstract: River seepage serves as the main source of groundwater in alluvial fans. However, reasonable estimates are rarely obtainable due to inaccuracy of vertical flows around the losing river. In the alluvial fan of the Toyohira River, Japan, to provide a straightforward description of vertical hydraulic gradient (VHG), this study demonstrates assignment of constant head boundary conditions on the shallowest aquitard instead of no-flow conditions on the basement. Initial constant heads and layer-scale anisotropy are calibrated in terms of hydraulic heads. As a result, the simulated river seepage is in reasonable agreement with previous discharge measurements, with net water loss determined to be approximately 1 m(3)/s. Although the simulation fails for water gain in the lower section, due to a lack of sporadic intercalations of fine deposits, the conditioned VHG modelling approach is found to be effective on a regional scale, especially when losing/gaining sections have not been identified in advance.
Rights: This is an Accepted Manuscript of an article published by Taylor & Francis in Hydrological sciences journal on July 2016, available online: http://www.tandfonline.com/10.1080/02626667.2015.1125481.
Type: article (author version)
URI: http://hdl.handle.net/2115/66343
Appears in Collections:工学院・工学研究院 (Graduate School of Engineering / Faculty of Engineering) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 阪田 義隆

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