Effects of heterogeneity distribution on hillslope stability during rainfalls
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Univ Arizona, Dept Hydrol & Water ResourcesIssue Date
2016-04Keywords
Cross-correlation analysisHeterogeneity
Hillslope stability
Saturated hydraulic conductivity
Stochastic conceptualization
Pore-water pressure
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Effects of heterogeneity distribution on hillslope stability during rainfalls 2016, 9 (2):134 Water Science and EngineeringJournal
Water Science and EngineeringRights
Copyright © 2016 Hohai University. Production and hosting by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).Collection Information
This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.Abstract
The objective of this study was to investigate the spatial relationship between the most likely distribution of saturated hydraulic conductivity (K-s) and the observed pressure head (P) distribution within a hillslope. The cross-correlation analysis method was used to investigate the effects of the variance of lnK(s), spatial structure anisotropy of lnK(s), and vertical infiltration flux (q) on P at some selected locations within the hillslope. The cross-correlation analysis shows that, in the unsaturated region with a uniform flux boundary, the dominant correlation between P and Ks is negative and mainly occurs around the observation location of P. A relatively high P value is located in a relatively low Ks zone, while a relatively low P value is located in a relatively high Ks zone. Generally speaking, P is positively correlated with q/Ks at the same location in the unsaturated region. In the saturated region, the spatial distribution of K-s can significantly affect the position and shape of the phreatic surface. We therefore conclude that heterogeneity can cause some parts of the hillslope to be sensitive to external hydraulic stimuli (e.g., rainfall and reservoir level change), and other parts of the hillslope to be insensitive. This is crucial to explaining why slopes with similar geometries would show different responses to the same hydraulic stimuli, which is significant to hillslope stability analysis. (C) 2016 Hohai University. Production and hosting by Elsevier B.V.Note
Open Access Journal.ISSN
16742370Version
Final published versionSponsors
China Scholarship Council [201406410032]; National Natural Science Foundation of China [41172282]; Strategic Environmental Research and Development Program [ER-1365]; Environmental Security and Technology Certification Program [ER201212]; National Science Foundation-Division of Earth Sciences [1014594]Additional Links
http://linkinghub.elsevier.com/retrieve/pii/S1674237016300163ae974a485f413a2113503eed53cd6c53
10.1016/j.wse.2016.06.004
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Except where otherwise noted, this item's license is described as Copyright © 2016 Hohai University. Production and hosting by Elsevier B.V. This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).