Dario Carrea

Dario Carrea
University of Lausanne | UNIL · Institute of Earth Sciences (ISTE)

MSc

About

50
Publications
15,420
Reads
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406
Citations
Citations since 2016
7 Research Items
367 Citations
2016201720182019202020212022020406080
2016201720182019202020212022020406080
2016201720182019202020212022020406080
2016201720182019202020212022020406080
Additional affiliations
May 2010 - present
University of Lausanne
Position
  • PhD Student

Publications

Publications (50)
Article
Full-text available
The use of 3D point clouds to improve the understanding of natural phenomena is currently applied in natural hazard investigations, including the quantification of rockfall activity. However, 3D point cloud treatment is typically accomplished using nondedicated (and not optimal) software. To fill this gap, we present an open-source, specific rockfa...
Article
Full-text available
This paper presents an overview of existing methods developed to characterize initial landslide failure surfaces and compute volumes based on surface information, when it is buried. This paper reviews the simplest models, such as volume estimation based on ellipsoids, and the information that can be obtained from surface displacement and morphology...
Article
Full-text available
This experimental work focuses on the cratering response of granular layers induced by liquid droplet impacts. A droplet impact results in severe granular layer deformation, crater formation and deposits in the vicinity of the impact center. High-precision three-dimensional imaging of the granular layer surface revealed important characteristics of...
Article
Full-text available
Rockfalls strongly influence the evolution of steep rocky landscapes and represent a significant hazard in mountainous areas. Defining the most probable future rockfall source areas is of primary importance for both geomorphological investigations and hazard assessment. Thus, a need exists to understand which areas of a steep cliff are more likely...
Article
Full-text available
Monitoring landslides with terrestrial laser scanning (TLS) is currently a well-known technique. One problem often encountered is the vegetation that produces shadow areas on the scans. Indeed, the points behind a given obstacle are hidden and thus occluded on the point cloud. Thereby, locations monitored with terrestrial laser scanner are mostly r...
Article
Full-text available
Ground-based LiDAR has been traditionally used for surveying purposes via 3D point clouds. In addition to XYZ coordinates, an intensity value is also recorded by LiDAR devices. The intensity of the backscattered signal can be a significant source of information for various applications in geosciences. Previous attempts to account for the scattering...
Article
Full-text available
The detection and characterisation of geological layers, as well as the precise quantification of their geometrical properties, is of primary interest in several domains of geology. Nevertheless, geological data gathering is commonly limited by access issues during fieldwork investigations. Here we present complementary and alternative tools aimed...
Article
Full-text available
An experiment has been carried out to find a reliable method to map 3D geological contacts using high-resolution Digital Elevation Models (DEMs) and pictures. Various airborne and ground-based photos, and a classical geological map, have been draped by several users on DEMs of the Scex Rouge Mountain (Vaud, Swiss Alps) producing several 3D textured...
Article
Geological mapping in vertical rock faces is extremely challenging because of access difficulties and limited possibilities of recognition, localization and measurement of features at large distance with traditional tools. Moreover, vertical areas can be of primary interest since they often display good quality outcrops and relevant geological info...
Conference Paper
Full-text available
Granular impacts have been extensively studied but much remains to be investigated regarding the complex topic of liquid-to-granular impact. Its applications to Geosciences are of interest regarding recent advances in the investigation of the raindrop erosion or the sediment flux. In our study, we focus on the quantification of both the excavated a...
Conference Paper
Full-text available
2) Posiva Oy, Eurajoki, Finland The Onkalo site has been selected as final deep geological repository for the disposal of nuclear waste in Finland. Several exploratory boreholes, similar to those that will host the nuclear waste, are currently under construction in order to analyse various technical aspects of the disposal. Among them, an accurate...
Conference Paper
Full-text available
Multiple sources of geological data exist nowadays, most of them are in 2D (e.g. geological maps, geological panoramic sketch), and only a few are in 3D (e.g. block diagram). One of the current challenges in geological map-ping consists not only in providing a more consistent 3D data, but also in pursuing a gathering and a harmonisation of the geol...
Article
Full-text available
Integrated in a wide research assessing destabilizing and triggering factors to model cliff dynamic along the Dieppe’s shoreline in High Normandy, this study aims at testing boat-based mobile LiDAR capabilities by scanning 3D point clouds of the unstable coastal cliffs. Two acquisition campaigns were performed in September 2012 and September 2013,...
Conference Paper
Full-text available
The acquisition of dense terrain information using well-established 3D techniques (e.g. LiDAR, phtogrammetry) and the use of new mobile platforms (e.g. Unmanned Aerial Vehicles) together with the increasingly efficient post-processing workflows for image treatment (e.g. Structure From Motion) are opening up new possibilities for analysing, modeling...
Conference Paper
Full-text available
Terrestrial Laser Scanning (TLS) technique allows acquiring high density and high precision measurements for landslide surface monitoring. Thanks to this 3D data, it is possible to increase accuracy in collapsed volumes estimation between two temporal acquisitions, from small events (dm 3) to large rock slope failures (1000 m 3). Some examples incl...
Conference Paper
Full-text available
Landslides are complex natural systems with non-linear and time variant response to a given input rainfall rate. Although landslide response (e.g. rate of displacement) is normally assumed uniform along time for a constant input (e.g. rainfall rate), we show how the use of adaptive moving windows for parameter's calibration may lead to a better pre...
Poster
Full-text available
The modelling of rock cliff erosion rates through rockfall magnitude-frequency is a well-known technique extensively carried out before by many authors (e.g. Dussauge-Peisser et al., 2002; Brunetti et al., 2009; Barlow et al., 2012; Guerin et al., 2014). These studies show how the relation between frequency (F) and magnitude (M) of rockfalls is wel...
Conference Paper
Full-text available
The modelling of rock cliff erosion rates through rockfall magnitude-frequency is a well-known technique extensively carried out before by many authors (e.g. Barlow et al., 2012; Guerin et al., 2014). These studies show how the relation between frequency (F) and magnitude (M) of rockfalls is well fitted by a negative power law [F = a* Mˆhe value of...
Conference Paper
Full-text available
Landslides are complex phenomena affected by many different processes and factors. The identification of the relative importance of these factors can be complicated, due to difficulties in accurately quantifying every parameter and in process repeatability. In this study, we used laboratory scale experiments through a sandbox for creating artificia...
Conference Paper
Full-text available
The morphology of the Swiss Plateau is modeled by numerous steep cliffs of Molasse. These cliffs are mainly composed of sub-horizontal alternated layers of sandstone, shale and conglomerates deposed in the Alps foreland basin during the Tertiary period. These Molasse cliffs are affected by erosion processes inducing numerous rockfall events. Thus,...
Article
Full-text available
Integrated in a wider research that plans to assess destabilizing and triggering factors for cliff dynamic modelling, this study aimed to test boat-based mobile LiDAR in the Channel water by acquiring 3D point clouds along Dieppe's unstable coastal cliffs. The precision of the acquired data is small enough to map geomorphological features at decime...
Technical Report
Full-text available
The present document reports the observations and analyses made at the University of Lausanne (UNIL) on the point cloud datasets from the test deposition holes of the ONKALO facility (Olkiluoto, Finland). This study has revealed that an artificial distortion due to the acquisition procedure affects part of the data (up to 6 mm shift). This distorti...
Conference Paper
Full-text available
In Yosemite Valley rockfall hazard and risk are high due to the presence of tall, steep granitic cliffs and to the large number of visitors. The main information needed to assess rockfall hazard is the location of the most probable rockfall source areas and the establishment of the frequency of activity from these areas. Terrestrial Laser Scanning...
Article
Full-text available
Dieppe coastal cliffs, in Normandy, France, are mainly formed by sub-horizontal deposits of chalk and flintstone. Largely destabilized by an intense weathering and the Channel sea erosion, small and large rockfalls are regularly observed and contribute to retrogressive cliff processes. During autumn 2012, cliff and intertidal topographies have been...
Article
Full-text available
The quarry of Bocheresse is located in the Val de Bagnes, in the Valais County (Switzerland) and was quarried for the soapstone used for the production of ovens. As the operation of the quarry is stopped nowadays, it is now a place of historical interest. Before its opening to visitors, a detailed study for the stability and movement detections was...
Conference Paper
Full-text available
The present study focuses on the rock slope of Montset, a 2622 m high summit in the Penninic Alps, in Switzerland. Different features (morpho-structure, size of the phenomenon, present-day rate of displacement, and ancient collapse of the lower part of the slope) suggest that it is a deep-seated slope deformation (DSGSD). The detection and the moni...
Conference Paper
Full-text available
In recent years laser scanning use has increased in different geosciences fields especially in natural hazards. Landslides can be monitored by laser scanning technique using sequential time scan comparison. Current challenges in landslide forecasting are focused in better quantifying the real 3D deformation of the slope, in order to understand glob...
Conference Paper
Full-text available
On October 10th 2012 a massive rockfall of several thousands of cubic meters occurred in a quarry in western Switzerland. The detection and quantification of pre- and post-failure deformation represent important tasks to understand the failure mechanisms and the geometry of the rock slope failure, aiming ultimately to assess its stability. Terrestr...
Article
Full-text available
We present a model for ground displacements prediction using a transfer function. Model was mainly tested at the Barmasse rockslide (Valais, Switzerland) which is an active structurally-controlled instability formed by intensively deformed and metamorphosed mica schists. The kinematics of the slide, which currently threatens roads and inhabitants o...
Article
Full-text available
Laser scanner techniques (also referred to as LiDAR) have recently allowed the acquisition of high accuracy and high resolution 3D geometry of the terrain. A large set of geomorphological applications currently deal with precise recognition of changes on different environments as riverside erosion, rock cliff deformation, landslide evolution, etc.,...
Poster
Full-text available
Monitoring landslides with terrestrial LiDAR is currently a well-known technique. One problem often encountered is the vegetation that produces shadow areas on the scans. Indeed, the points behind the obstacle are hidden and are absent from the point cloud. Thereby, locations monitored with terrestrial laser scanner are mostly rock instabilities an...
Conference Paper
Full-text available
The area of Montatuay (Val Ferret, Valais) is known for numerous instabilities affecting its mountain sides. The February 10th 2011 a sudden rockslide of ~200 m high and ~1'000 m3 happened on western flank of Montatuay which results in obstructing the river. The rockslide morphology is divided in two zones. An active zone in the upper part producin...
Conference Paper
Full-text available
Current challenges in landslide forecasting include the development of new techniques to predict rockfalls in natural slopes using a certain precursory indicator as precursory rockfalls leading to larger failures, micro-seismic events, precursory deformation, etc. Regarding small scale pre-failure deformation leading to larger failures, current tec...
Article
Full-text available
Little is known about the characteristics (magnitude, frequency, spatial location, etc) of precursory rockfalls leading to larger failures. In order to better understand this phenomena, we investigated the spatial location of precursory rockfalls and how these events tends to concentrate along the cracks that define the boundaries of the area were...
Article
Full-text available
Rock cliffs analysis from terrestrial Lidar data requires frequently to merge multiple scans or to compare successive scans to detect cm changes or displacements. This processing step is known by the name of alignment. The presence of vegetation in between the sensor and the rock face may strongly impair the accuracy of alignment. It is then recom...
Article
Full-text available
Rockfall hazard in Yosemite Valley is especially high owing to the great cliff heights (~1 km), the fracturing of the steep granitic cliffs, and the widespread occurrence of surface parallel sheeting or exfoliation joints. Between 1857 and 2011, 890 documented rockfalls and other slope movements caused 15 fatalities and at least 82 injuries. The fi...
Conference Paper
Full-text available
In numerical rockfall simulation, the runout of rockfall is highly dependent of the restitution coefficients which are one of the key parameters to estimate the energy and simulate the rebounds of the blocks during their travel. Restitution coefficients values derived from literature may however not be adapted to every rockfall area as they do not...
Conference Paper
Full-text available
The Monte Generoso rockfall testing area is a mountainside located in the canton of Ticino (southern Switzerland) above an important highway that links Italy to Northern Europe. The slope is steep and consists of two high fractured limestone cliffs situated one above the other and divided by a sparse forest. The highway is potentially affected by r...
Chapter
Full-text available
Long-range terrestrial laser scanning (TLS) is widely used in studies on rock slope instabilities. TLS point clouds allow the creation of high-resolution digital elevation models for detailed mapping of landslide morphologies and the measurement of the orientation of main discontinuities. Multi-temporal TLS datasets enable the quantification of slo...
Conference Paper
Full-text available
The terrestrial laser scanning (TLS) is an active remote sensing technique providing high resolution point clouds of the topography. The high resolution digital elevations models (HRDEM) derived of these point clouds are an important tool for the stability analysis of slopes. The LYNX Mobile Mapper is a new TLS generation developed by Optech. Its p...
Conference Paper
Full-text available
The unstable rock slope area around Stampa in Flåmsdalen is one of the largest actively deforming rockslide areas in Western Norway (Domaas et al., 2002). It covers an area of up to 11 km² that extends 7 km N-S and 2 km W-E and shows signs of active and postglacial gravitational deformation. As the consequence of a failure could be high, an intensi...

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