
Philippe GrandjeanClaude Bernard University Lyon 1 | UCBL
Philippe Grandjean
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38
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Introduction
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Publications
Publications (38)
Although the Helvetic nappes of the Western Alps have been widely studied, their style, amount, and timing of deformation during the Alpine orogeny remain a subject of controversy. The discussion partly arises from various interpretations of the external crystalline massifs geometry and of the cover/basement relationships. Here, we apply structural...
Located 51.5°S in the vicinity of the Southern Patagonian Ice Field, Cerro Benítez and the glacial valley of Lago Sofía host several caves and rock shelters that were occupied by megafauna and humans during the Late Pleistocene, including the Mylodon Cave and two of the oldest archaeological sites in Patagonia. During the last glaciation, Cerro Ben...
Hyper-DRELIO (Hyperspectral DRone for Environmental and LIttoral Observations) is a custom, mini-UAV (unmanned aerial vehicle) platform (<20 kg), equipped with a light push broom hyperspectral sensor combined with a navigation module measuring position and orientation. Because of the particularities of UAV surveys (low flight altitude, small spatia...
The objective of this chapter is to understand the processes involved in the coastal dynamics. Nevertheless, the development of new miniaturized image sensors (digital cameras, thermal sensors, hyperspectral, Lidar, etc.) and positioning systems associated with the development of new platforms such as unmanned aerial vehicles (UAVs) have led to the...
On November 11, 2019, a Mw 4.9 earthquake hit the region close to Montelimar (lower Rhône Valley, France), on the eastern margin of the Massif Central close to the external part of the Alps. Occuring in a moderate seismicity area, this earthquake is remarkable for its very shallow focal depth (between 1 and 3 km), its magnitude, and the moderate to...
On November 11, 2019, a Mw 4.9 earthquake hit the region close to Montelimar (lower Rhône Valley, France), on the eastern margin of the Massif Central close to the external part of the Alps. Occuring in a moderate seismicity area, this earthquake is remarkable for its very shallow focal depth (between 1 and 3 km), its magnitude, and the moderate to...
A field experiment was conducted at a tropical microtidal intermediate sandy beach with a low tide terrace (Nha Trang, Vietnam) to investigate the short-term swash-zone hydrodynamics and morphodynamics under variable wave conditions. Continuous 2D Lidar scanner observations of wave height at the lower foreshore, subsequent run-up and swash-induced...
In the dual context of coastal hazard intensification and the growing number of stakes exposed to these hazards, coastal observatories are in demand to provide a structured framework dedicated to long-term monitoring. This article describes the drone-based photogrammetry monitoring performed since 2006 on Porsmilin Beach (Brittany, France) in the f...
UAVs are relevant for monitoring cliff faces. In this study, several flights are performed with various imaging angles (nadir, 20° 30° and 40° off-nadir) to assess the impact of the imaging angle on the 3D cliff face reconstruction. Occlusions issues arising with sub-vertical cliffs make nadir surveys nearly irrelevant. The results obtained with 20...
The Sillon de Talbert is situated on the Northern coast of Brittany; it is a large 3.5 km-long swash-aligned gravel spit barrier comprising a volume of sediment of 1.23x10 ⁶ m 3. Since 2002 a morphodynamic survey was carried out. It is based on annual DEMs and monthly beach proile measurements. Waves and water levels are also surveyed using modelli...
Owing to the combination of technological progress in Unmanned Aerial Vehicles (UAVs) and recent advances in photogrammetry processing with the development of the Structure-from-Motion (SfM) approach, UAV photogrammetry enables the rapid acquisition of high resolution topographic data at low cost. This method is particularly widely used for geomorp...
The Sillon de Talbert is a large swash-aligned gravel barrier spit of 3.5 km length, situated on the Northern coast of Brittany. Over the last decades, the spit experienced landward migration by rollover reaching 1.1 m yr⁻¹ at least since 1930, with maximum retreat rates of 1.35 m yr⁻¹ affecting the proximal section. This evolution has led to the c...
Tidally modulated shoreface (TMS) corresponds to peculiar costal environments. The general morphology and the expressed bedforms are provided by the interplay of both waves and tides. The recognition of TMS in the fossil record still remains a difficult task. The study of one mega-tidal modern TMS in the north of France (Berck-Plage) provides new k...
Hyperspectral imagery has proven its potential in many research applications, especially in the field of environmental sciences. Currently, hyperspectral imaging is generally performed by satellite or aircraft platforms, but mini-UAV (Unmanned Aerial Vehicle) platforms (<20 kg) are now emerging. On such platforms, payload restrictions are critical,...
This paper aims to compare models from terrestrial laser scanning (TLS), terrestrial photogrammetry (TP) and unmanned aerial vehicle photogrammetry (UAVP) surveys to evaluate their potential in cliff erosion monitoring. TLS has commonly been used to monitor cliff face erosion (monitoring since 2010 in Normandy) because it guarantees results of high...
Large clastic cliff-top storm deposits (called CTSDs) are one of the most remarkable signatures that characterizes extreme storm wave events on coastal cliffs. Hence, the study of CTSDs is of key importance for understanding and predicting the impacts of extreme storm wave events on rocky coasts or establishing proxies for storm intensity. The pres...
For monitoring purposes and in the context of geomorphological research, Unmanned Aerial Vehicles (UAV) appear to be a promising solution to provide multi-temporal Digital Surface Models (DSMs) and orthophotographs. There are a variety of photogrammetric software tools available for UAV-based data. The objective of this study is to investigate the...
Intertidal mudflats play a critical role in estuarine exchange, connecting marine and continental supplies of nutrients and sediments. However, their complex morphodynamics, associated with a wide range of physical and biological processes, are still poorly understood and require further field investigation. In addition, mudflats are challenging ar...
A field experiment was conducted on a sandy beach with a low tide terrace (Nha Trang, Vietnam) to investigate the swash zone hydro- and morphodynamics throughout different tide and wave conditions. A 2D Lidar was used to measure runup properties and bed level changes on the swash zone. An energetic monsoon wave event provided energetic conditions d...
Thermal infrared remote sensing can be worthwhile to highlight a spatial distribution of water temperature and to locate cold spots that can serve as thermal refuges for some species during summer. Three airborne campaigns were conducted on the lower Ain River (France) during the summers of 2010, 2011 and 2014. Based on these images, a large number...
Multitemporal topographic measurements are essential for monitoring municipal landfills for economic and security reasons. Accurate evaluation of the landfill volumes still to exploit and the extent of subsidence occurring in the closed plots are critical parameters in landfill management. A municipal landfill located in central Italy has been imag...
Braided rivers exhibit high spatial thermal heterogeneity that is difficult to understand using only in situ measurements. In this summer study, we used a drone and a powered paraglider to acquire very high spatial resolution 14–27 cm thermal infrared TIR images of nine braided reaches located in the French Alps. We applied atmospheric corrections...
Temporal and spatial temperature patterns of 9 braided rivers using very high resolution thermal infrared (TIR) images Analyse spatio-temporelle des patrons thermiques de 9 rivières en tresses par imagerie infrarouge thermique (IRT) très haute résolution RÉSUMÉ Les rivières en tresses présentent une très forte variabilité spatiale de leurs températ...
We report a new methodology to estimate the impact of extreme events on sediment transport in rivers. Our approach relies on two complementary instruments developed and tested during a 1.5 years field survey performed from june 2007 to january 2009 on the Capesterre river located on Basse-Terre island (Guadeloupe archipelago, Lesser Antilles Arc)....
We have modelled the formation and the layer-parallel shortening of layered (stromatic) migmatites. The model consists of thin superposed layers of partially molten microcrystalline wax. The melt (30 vol.%) has a negative buoyancy and a high viscosity contrast with its solid matrix. As soon as the shortening begins, melt-filled veins with high aspe...