NDLI: Landslide Kinematical Analysis through Inverse Numerical Modelling and Differential SAR Interferometry

Content Provider	Springer Nature Link
Author	Castaldo, R. Tizzani, P. Lolli, P. Calò, F. Ardizzone, F. Lanari, R. Guzzetti, F. Manunta, M.
Copyright Year	2014
Abstract	The aim of this paper is to propose a methodology to perform inverse numerical modelling of slow landslides that combines the potentialities of both numerical approaches and well-known remote-sensing satellite techniques. In particular, through an optimization procedure based on a genetic algorithm, we minimize, with respect to a proper penalty function, the difference between the modelled displacement field and differential synthetic aperture radar interferometry (DInSAR) deformation time series. The proposed methodology allows us to automatically search for the physical parameters that characterize the landslide behaviour. To validate the presented approach, we focus our analysis on the slow Ivancich landslide (Assisi, central Italy). The kinematical evolution of the unstable slope is investigated via long-term DInSAR analysis, by exploiting about 20 years of ERS-1/2 and ENVISAT satellite acquisitions. The landslide is driven by the presence of a shear band, whose behaviour is simulated through a two-dimensional time-dependent finite element model, in two different physical scenarios, i.e. Newtonian viscous flow and a deviatoric creep model. Comparison between the model results and DInSAR measurements reveals that the deviatoric creep model is more suitable to describe the kinematical evolution of the landslide. This finding is also confirmed by comparing the model results with the available independent inclinometer measurements. Our analysis emphasizes that integration of different data, within inverse numerical models, allows deep investigation of the kinematical behaviour of slow active landslides and discrimination of the driving forces that govern their deformation processes.
Starting Page	3067
Ending Page	3080
Page Count	14
File Format	PDF
ISSN	00334553
Journal	Pure and applied geophysics
Volume Number	172
Issue Number	11
e-ISSN	14209136
Language	English
Publisher	Springer Basel
Publisher Date	2014-12-23
Publisher Place	Basel
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Numerical modelling optimization procedure differential SAR interferometry slow landslide Geophysics/Geodesy
Content Type	Text
Resource Type	Article
Subject	Geochemistry and Petrology Geophysics

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