A computationally efficient system for assessing near-real-time instability of regional unsaturated soil slopes under rainfall

Li, L; Ju, N; He, C; Li, C; Sheng, D

A computationally efficient system for assessing near-real-time instability of regional unsaturated soil slopes under rainfall

Li, L Ju, N He, C Li, C Sheng, D

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Publisher:: Springer (part of Springer Nature)
Publication Type:: Journal Article
Citation:: Landslides, 2020, 17, (4), pp. 893-911
Issue Date:: 2020

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Field	Value	Language
dc.contributor.author	Li, L
dc.contributor.author	Ju, N
dc.contributor.author	He, C
dc.contributor.author	Li, C
dc.contributor.author	Sheng, D https://orcid.org/0000-0002-1665-6931
dc.date.accessioned	2020-10-15T07:03:19Z
dc.date.available	2020-10-15T07:03:19Z
dc.date.issued	2020
dc.identifier.citation	Landslides, 2020, 17, (4), pp. 893-911
dc.identifier.issn	1612-510X
dc.identifier.issn	1612-5118
dc.identifier.uri	http://hdl.handle.net/10453/143266
dc.description.abstract	© 2019, Springer-Verlag GmbH Germany, part of Springer Nature. The objective of this paper is to obtain an applicable assessment method and a Web-GIS-based prediction system for regional landslides. The traditional Richards function is reconstructed using the soil-water characteristic curve (SWCC) and the coordinate transformation technique. The analytical pore pressure for a slope model is derived by solving the modified Richard equation via the Green function and Fourier transformation. The obtained transient pore pressure field is then incorporated with Brakensiek’s matric suction theory, to build a conceptual model for rainfall-induced shallow landslides. The safety factor is obtained by solving the limit equilibrium equation of the conceptual model. The method is then implemented in a Web-GIS system, considering influence of slope geometry features, geology parent material, and near-real-time rainfall intensity of the study area. It is verified that this method is computationally efficient and reliable for gentle slopes and short rainfall durations. Moreover, an extensive parameter study shows that the two commonly used coefficients in the intensity-duration equation are both correlated to rainfall inter-event time via exponential functions, and rainfall event time via power functions. The primary influential factor for regional landslides is the initial water content, followed by the rainfall duration and intensity, and least by soil thickness.
dc.language	en
dc.publisher	Springer (part of Springer Nature)
dc.relation.ispartof	Landslides
dc.relation.isbasedon	10.1007/s10346-019-01307-3
dc.rights	info:eu-repo/semantics/restrictedAccess
dc.subject	0406 Physical Geography and Environmental Geoscience, 0905 Civil Engineering
dc.subject.classification	Strategic, Defence & Security Studies
dc.title	A computationally efficient system for assessing near-real-time instability of regional unsaturated soil slopes under rainfall
dc.type	Journal Article
utslib.citation.volume	17
utslib.for	0905 Civil Engineering
utslib.for	0406 Physical Geography and Environmental Geoscience
utslib.for	0406 Physical Geography and Environmental Geoscience
utslib.for	0905 Civil Engineering
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology
pubs.organisational-group	/University of Technology Sydney/Faculty of Engineering and Information Technology/School of Civil and Environmental Engineering
pubs.organisational-group	/University of Technology Sydney
utslib.copyright.status	closed_access	*
pubs.consider-herdc	true
dc.date.updated	2020-10-15T07:03:10Z
pubs.issue	4
pubs.publication-status	Published
pubs.volume	17
utslib.citation.issue	4

Abstract:

© 2019, Springer-Verlag GmbH Germany, part of Springer Nature. The objective of this paper is to obtain an applicable assessment method and a Web-GIS-based prediction system for regional landslides. The traditional Richards function is reconstructed using the soil-water characteristic curve (SWCC) and the coordinate transformation technique. The analytical pore pressure for a slope model is derived by solving the modified Richard equation via the Green function and Fourier transformation. The obtained transient pore pressure field is then incorporated with Brakensiek’s matric suction theory, to build a conceptual model for rainfall-induced shallow landslides. The safety factor is obtained by solving the limit equilibrium equation of the conceptual model. The method is then implemented in a Web-GIS system, considering influence of slope geometry features, geology parent material, and near-real-time rainfall intensity of the study area. It is verified that this method is computationally efficient and reliable for gentle slopes and short rainfall durations. Moreover, an extensive parameter study shows that the two commonly used coefficients in the intensity-duration equation are both correlated to rainfall inter-event time via exponential functions, and rainfall event time via power functions. The primary influential factor for regional landslides is the initial water content, followed by the rainfall duration and intensity, and least by soil thickness.

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http://hdl.handle.net/10453/143266