HUSCAP logo Hokkaido Univ. logo

Hokkaido University Collection of Scholarly and Academic Papers >
Graduate School of Science / Faculty of Science >
Peer-reviewed Journal Articles, etc >

Depth dependence and exponential models of permeability in alluvial-fan gravel deposits

Files in This Item:
Sakata (2013) Depth-dependence of permeability-1.pdf940.51 kBPDFView/Open
Please use this identifier to cite or link to this item:

Title: Depth dependence and exponential models of permeability in alluvial-fan gravel deposits
Authors: Sakata, Yoshitaka Browse this author
Ikeda, Ryuji Browse this author
Keywords: Unconsolidated sediments
Hydraulic properties
Alluvial fan
Undisturbed core
Issue Date: Jun-2013
Publisher: Springer
Journal Title: Hydrogeology Journal
Volume: 21
Issue: 4
Start Page: 773
End Page: 786
Publisher DOI: 10.1007/s10040-013-0961-8
Abstract: To determine depth dependence of permeability in various geologic deposits, exponential models have often been proposed. However, spatial variability in hydraulic conductivity, K, rarely fits this trend in coarse alluvial aquifers, where complex stratigraphic sequences follow unique trends due to depositional and post-depositional processes. This paper analyzes K of alluvial-fan gravel deposits in several boreholes, and finds exponential decay in K with depth. Relatively undisturbed gravel cores obtained in the Toyohira River alluvial fan, Sapporo, Japan, are categorized by four levels of fine-sediment packing between gravel grains. Grain size is also analyzed in cores from two boreholes in the mid-fan and one in the fan-toe. Profiles of estimated conductivity, , are constructed from profiles of core properties through a well-defined relation between slug-test results and core properties. Errors in are eliminated by a moving-average method, and regression analysis provides the decay exponents of with depth. Moving-average results show a similar decreasing trend in only the mid-fan above 30-m depth, and the decay exponent is estimated as a parts per thousand 0.11 m(-1), which is 10- to 1,000-fold that in consolidated rocks. A longitudinal cross section is also generated by using the profiles to establish hydrogeologic boundaries in the fan.
Rights: The final publication is available at
Type: article (author version)
Appears in Collections:理学院・理学研究院 (Graduate School of Science / Faculty of Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 阪田 義隆

Export metadata:

OAI-PMH ( junii2 , jpcoar_1.0 )

MathJax is now OFF:


 - Hokkaido University