Spatial variation of saturated hydraulic conductivity of a loess slope in the South Jingyang Plateau, China

Spatial variation of saturated hydraulic conductivity of a loess slope in the South Jingyang... Water infiltration in loess soils is an important trigger causing landslides, in which the hydraulic conductivity of the loess plays an important role. By analyzing a soil trench and soil samples from the South Jingyang Plateau, northwest China, a loess slope was investigated. A horizontal adit in a Lishi loess layer was also analyzed. Using variable head permeability tests the saturated horizontal hydraulic conductivity (Kh) and saturated vertical hydraulic conductivity (Kv) of the loess samples were measured. Results showed that the majority of the Kh values are larger than the Kv values, indicating that the loess exhibits permeability anisotropy. Lilliefors test was used to determine the normality of the Kh and Kv results. Test results indicate that Kh and Kv measurements of the loess samples collected in the trench and adit all show log-normal distribution, while a number of the Kh and Kv values also reflect a normal distribution. Geo-statistical analysis shows that the spherical model and the Gaussian model provide the best fit variograms of Kh and Kv values along the trench; analysis along the adit indicated the opposite results. The variogram range values suggest that the spatial correlation of loess Kv is greater in the vertical direction in a horizontal plane, while the spatial correlation of Kh in the adit is greater than that in the vertical direction. Loess structure rather than randomness decides the spatial variation of Kh and Kv measurements (except for Kh variation along the adit which depends on both structural factor and randomness). Kh and Kv values of loess tend to decrease with depth; results which can be described by an exponential decay model. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Engineering Geology Elsevier

Spatial variation of saturated hydraulic conductivity of a loess slope in the South Jingyang Plateau, China

Loading next page...
 
/lp/elsevier/spatial-variation-of-saturated-hydraulic-conductivity-of-a-loess-slope-LM9btn0xFg
Publisher
Elsevier
Copyright
Copyright © 2017 Elsevier B.V.
ISSN
0013-7952
eISSN
1872-6917
D.O.I.
10.1016/j.enggeo.2017.08.002
Publisher site
See Article on Publisher Site

Abstract

Water infiltration in loess soils is an important trigger causing landslides, in which the hydraulic conductivity of the loess plays an important role. By analyzing a soil trench and soil samples from the South Jingyang Plateau, northwest China, a loess slope was investigated. A horizontal adit in a Lishi loess layer was also analyzed. Using variable head permeability tests the saturated horizontal hydraulic conductivity (Kh) and saturated vertical hydraulic conductivity (Kv) of the loess samples were measured. Results showed that the majority of the Kh values are larger than the Kv values, indicating that the loess exhibits permeability anisotropy. Lilliefors test was used to determine the normality of the Kh and Kv results. Test results indicate that Kh and Kv measurements of the loess samples collected in the trench and adit all show log-normal distribution, while a number of the Kh and Kv values also reflect a normal distribution. Geo-statistical analysis shows that the spherical model and the Gaussian model provide the best fit variograms of Kh and Kv values along the trench; analysis along the adit indicated the opposite results. The variogram range values suggest that the spatial correlation of loess Kv is greater in the vertical direction in a horizontal plane, while the spatial correlation of Kh in the adit is greater than that in the vertical direction. Loess structure rather than randomness decides the spatial variation of Kh and Kv measurements (except for Kh variation along the adit which depends on both structural factor and randomness). Kh and Kv values of loess tend to decrease with depth; results which can be described by an exponential decay model.

Journal

Engineering GeologyElsevier

Published: Mar 26, 2018

References

You’re reading a free preview. Subscribe to read the entire article.


DeepDyve is your
personal research library

It’s your single place to instantly
discover and read the research
that matters to you.

Enjoy affordable access to
over 12 million articles from more than
10,000 peer-reviewed journals.

All for just $49/month

Explore the DeepDyve Library

Unlimited reading

Read as many articles as you need. Full articles with original layout, charts and figures. Read online, from anywhere.

Stay up to date

Keep up with your field with Personalized Recommendations and Follow Journals to get automatic updates.

Organize your research

It’s easy to organize your research with our built-in tools.

Your journals are on DeepDyve

Read from thousands of the leading scholarly journals from SpringerNature, Elsevier, Wiley-Blackwell, Oxford University Press and more.

All the latest content is available, no embargo periods.

See the journals in your area

DeepDyve Freelancer

DeepDyve Pro

Price
FREE
$49/month

$360/year
Save searches from
Google Scholar,
PubMed
Create lists to
organize your research
Export lists, citations
Read DeepDyve articles
Abstract access only
Unlimited access to over
18 million full-text articles
Print
20 pages/month
PDF Discount
20% off