Influence of bedding orientation on the anisotropy of hydraulic conductivity in a well-sorted fluvial sediment

Dong Hui Cheng, Xun Hong Chen, Ai Di Huo, Min Gao, Wen Ke Wang

Research output: Contribution to journalArticle

8 Scopus citations

Abstract

The paper describes a permeameter test method for determination of the hydraulic conductivity (. K) along multi-directions in fluvial sediments with cross beddings. Unlike existing in-situ permeameter methods that determine hydraulic conductivity for submerged streambeds, our method was intended to measure hydraulic conductivity of exposed streambeds or fluvial sediments. The method was applied to the Wei River, Shaanxi Province, Central China for characterization of the anisotropy of K in a well-sorted fluvial sediment. The results illustrated that even in well-sorted sediments, cross-bedding and sediment fabrication (or texture) can lead to varied K values along different measurement directions. The K value was the largest along the dip direction (or the major direction) that is parallel to the orientation of cross bedding and the smallest in the direction perpendicular to the bedding (or the minor direction). The K value in a given direction between the major and minor direction often fell in the range bounded by the K values in the major and minor directions. The anisotropy ratio of K (the ratio of K value between the major and minor directions) in two trenches for this well-sorted fluvial sediment was up to 1.14 to 1.23, respectively. Our results also demonstrated that even for well-sorted sediments, the K values between two sampling points only about 10 cm apart can differ. It is clear that the K distribution strongly correlates to the bedding orientation.

Original languageEnglish (US)
Pages (from-to)118-125
Number of pages8
JournalInternational Journal of Sediment Research
Volume28
Issue number1
DOIs
StatePublished - Mar 2013

Keywords

  • Anisotropy
  • Cross bedding
  • Fluvial sediment
  • Hydraulic conductivity
  • On-site permeameter test

ASJC Scopus subject areas

  • Geology
  • Stratigraphy

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