Morphological Changes Detection of a Large Earthflow Using Archived Images, LiDAR-Derived DTM, and UAV-Based Remote Sensing

Conforti, Massimo; Mercuri, Michele; Borrelli, Luigi

doi:10.3390/rs13010120

Cited by 37 publications

(17 citation statements)

References 76 publications

(109 reference statements)

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“…The results highlight that the SLs significantly control the present-day morphodynamic of the landscape (Figure 5b), and consequently are a great source of sediment delivered to streams (Roda-Boluda et al 2018;Borrelli et al 2019;Zhu et al 2019;Conforti et al 2021). Along the slopes, the occurrence of SLs was observed either isolated or clustered in groups of several landslides.…”

Section: Shallow Landslides and Their Relation With Geo-environmental Variablesmentioning

confidence: 82%

A refinement analysis of the shallow landslides susceptibility at regional scale supported by GIS-aided geo-database

Gullà

Conforti

Borrelli

2021

Geomatics, Natural Hazards and Risk

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Intense rainfall events often produce a great number of shallow landslides events, which in many cases can hits large areas or an entire regional territory. These slope instabilities cause damage to many roads, buildings, and infrastructures and often human loss. In these conditions, it is useful to refine shallow landslides susceptibility maps at regional scale progressively more reliable and efficacy. To take the highlighted goal it is opportune to promote the use of a circular approach that can considers knowledge (data, methods, models, solutions, etc.) constantly upgraded. To achieve this aims we propose a method that introduces structurally in a possible circular approach (progressive better results with constantly upgraded knowledge) the use of a comprehensive geo-database of shallow landslide events and related implemented through a collection and analysis of numerous sources, including published inventory maps, scientific literature, technical reports and newspapers, integrated by a multi-temporal interpretation of remote sensing images and several field surveys. The method is applied referring to the Calabria region, which is largely affected by this landslide category. The refined geo-database realized includes 22,028 shallow landslides, occurred between 1951 and 2017. The relationship between spatial pattern of the shallow landslides and the analyzed predisposing factors (lithological units, fault density, land use, drainage density, slope gradient, TWI, SPI and LS) showed that the high values of slope gradient, LS factor and drainage density, coupled to low values of TWI, displayed a strong control on the shallow landslide occurrence. The efficacy of the geo-database realization proves their usefulness in order to estimate and validate shallow landslide susceptibility map, which was optimally obtained applied a simple bivariate statistical method. The susceptibility map was classified into five classes and about 26% of the study area falls in high and very high susceptible classes and most of the shallow landslides mapped (76%) occur in the same classes. The AUC value of the prediction rate curve was 0.81, indicating a good prediction capability of the susceptibility map. The interaction between shallow landslide susceptibility map and road network map highlighted that the 20% of the roadways of the region area falls in high and very high ARTICLE HISTORY

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Section: Shallow Landslides and Their Relation With Geo-environmental Variablesmentioning

confidence: 82%

A refinement analysis of the shallow landslides susceptibility at regional scale supported by GIS-aided geo-database

Gullà

Conforti

Borrelli

2021

Geomatics, Natural Hazards and Risk

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“…Integrated analysis based on hydraulic modelling and nonstructural design [116,[124][125][126][127][128][129][130][131][132] Monitoring topography Repeated UAV surveys provide a unique opportunity to investigate geomorphic changes that result from an extreme event. The joint use of UAV and GIS methodologies proved to be a useful tool, not only for the rapid analysis of spatial data from a large population of sinkholes but also for providing an objective approach with consistent measurement and calculation processes.…”

Section: Monitoring Erosion or Landslide Activitymentioning

confidence: 99%

The Role of UAS–GIS in Digital Era Governance. A Systematic Literature Review

et al. 2021

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UAS (Unmanned Aircraft Systems) technologies, also known as UAV (Unmanned Aerial Vehicle), drones, or Remotely Piloted Aircraft System (RPAS) and GIS (Geographic Information System) are recognised for the value of the results that can be achieved by their combined use. However, their use and the results achieved are rarely framed within the context of Digital Era Governance (DEG), an undertaking that would significantly reduce the capabilities of knowledge transfer from the academic and/or private environment to the public domain. The purpose of this study was to highlight, by a bibliometric analysis, the areas of proposed use of this team of tools and the extent to which these can enter the sphere of interest of public administrations, especially local ones. From a methodological point of view, based on the 439 articles filtered from the Web of Science database where UAS/UAV and GIS technologies were used, several bibliometric analyses have emerged. VOSviewer and R (Bibliometrix tool) were used to conduct the bibliometric analyses. Most scientific publications that used UAV technology as a working tool have predominant applicability in photogrammetry, while GIS applications are found in publications dedicated to image processing, landslides, and cultural and archaeological heritage. We point out that from the point of view of international cooperation, at the level of institutions or countries, certain international organisations from the USA, China, and the central and northern European states have a high interest in this topic, and a low cooperation between academia and public administration is exhibited. The conclusion is represented by the apparent lack of framing of the results of UAS–GIS technologies usage into wider and more topical contexts, such as digital era governance, and also a reduced applicability of the research results.

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“…Since the 20th century, systematic aerial surveys have been conducted in many parts of the island every few years. These archives can be used to build historical ortho-photographs and digital surface model (DSM) and aid detection and quantification of ancient surface changes such as landslides, river incision and beach volumetric changes [24][25][26][27][28][29][30]. It has been demonstrated that a structure from motion and multi-view stereo (SFM-MVS) processing pipeline allows a high-resolution dense point cloud to be automatically and rapidly produced from digitalized archive aerial photographs [24,[29][30][31][32].…”

Section: Introductionmentioning

confidence: 99%

How Can the Morphometric Characteristics and Failure Conditions of a Historic Gully Caused by Intense Rainfall Be Reconstructed?

Rault¹,

Thiéry

Aunay³

et al. 2022

Earth

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In January 1980, during exceptional cyclonic rainfall, an atypical landslide, called déboulé, rapidly generated the permanent 700 m-long gully of the Ravine de l’Eglise on an inhabited plateau in Reunion Island (Indian Ocean). Retrieving the initial conditions that led to this historical process is both challenging and necessary for understanding the mechanism of gully incision and providing pointers for improving risk mitigation in relation to this phenomenon. In this study, we reconstruct the pre- and post-failure topographies using SFM (structure from motion) applied on archive aerial photographs. Based on the comparison of these digital elevation models, we estimate the volume of material eroded to be ca. 0.63 Mm3. Groundwater level increase, part of the triggering mechanism, is hindcast in the catchment of the gully using a lumped hydrological model. This model shows that in only a fortnight the groundwater level probably rose by 36 m, which could have caused a progressive increase in pore pressure and triggered formation of the gully by retrogressive landslides. We test this hypothesis by considering the pre-failure topography and the hindcast groundwater level in a deterministic model based on limit equilibrium equations to explore ground stability. The evolution of ground stability with a rise in the water table shows that the gully may have extended in a headward direction by retrogressive landslides. This is the first quantitative reconstruction of an exceptional historical event affecting the territory of Reunion Island. The methods used to investigate the Ravine de L’Eglise incision thus offer new complementary insights and challenges for understanding the mechanism and the temporality of gully formation.

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Morphological Changes Detection of a Large Earthflow Using Archived Images, LiDAR-Derived DTM, and UAV-Based Remote Sensing

Cited by 37 publications

References 76 publications

A refinement analysis of the shallow landslides susceptibility at regional scale supported by GIS-aided geo-database

A refinement analysis of the shallow landslides susceptibility at regional scale supported by GIS-aided geo-database

The Role of UAS–GIS in Digital Era Governance. A Systematic Literature Review

How Can the Morphometric Characteristics and Failure Conditions of a Historic Gully Caused by Intense Rainfall Be Reconstructed?

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