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Title: 扇状地の地下水シミュレーションにおける高解像度モデルの有効性
Other Titles: Effectiveness of a high resolution model on groundwater simulation in an alluvial fan
Authors: 阪田, 義隆1 Browse this author
池田, 隆司2 Browse this author
Authors(alt): Sakata, Yoshitaka1
Ikeda, Ryuji2
Issue Date: 19-Mar-2012
Publisher: 北海道大学大学院理学研究院自然史科学部門(地球物理学)
Journal Title: 北海道大学地球物理学研究報告
Journal Title(alt): Geophysical bulletin of Hokkaido University
Volume: 75
Start Page: 73
End Page: 89
Abstract: Large heterogeneity in an alluvial fan influences considerably on groundwater flow field. Applied to groundwater simulation, however, an alluvial aquifer, consisted of permeable gravelly sediments, is often simplified as a single or a few homogeneous layer(s) due to its complexity, lack of hydrogeological information, and knowledge. In a previous study in the Toyohira alluvial fan, we have formulated a relationship between hydraulic conductivities and auxiliary variables in undisturbed gravelly cores by focusing on the effective grain size diameter and lengths of matrix packing level. In this study, a permeability distribution model with the one-meter resolution was yielded by estimating spatial probabilities of auxiliary variables, and then was applied to groundwater flow and heat transport coupling simulation. The simulation results showed preferential flow vectors in high permeable cells, resulting in complex contours of heads and temperatures. It was inferred that such complicated groundwater flow fields occurred in actuality in the fan, because the calculated variations in heads and temperatures had the same trend as measured in an observation well. High permeable cells, which are connected with the river bed, influence selective flow significantly. A block averaged model with the five-meters resolution was also examined. As a result, outputs of vectors and contours were much uniformed and smoothed, because anisotropy in macro cells was disregarded. It was revealed that the high resolution model was effective and necessary for capturing more detail and actual groundwater flow field in an alluvial fan.
Type: bulletin (article)
Appears in Collections:北海道大学地球物理学研究報告 = Geophysical bulletin of Hokkaido University > 第75号

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