Dr. Antoine LUCAS

CNRS Researcher

Earth & Planetary System Science

Research

My research is focused on understanding the evolution of surfaces and near surfaces of the Earth and other planets, including lakes on Titan, landslides on Mars and icy satellites as well as aeolian transport on Mars, Venus and Titan. Other planets allow us to test our understanding of geological and climate processes under a wide range of conditions. By combining observations from planetary exploration missions with image processing and numerical modeling, I try to understand what controls the evolution of continental surfaces (including planetary counterparts) and more specifically mass wasting, aeolian and hydrology processes.

Publications

Opportunity

Undergrad's Degree internship in Earth & System Sciences is always possible. If you are a post-doc, there are plenty of options around the corner we can discuss. Interested individuals should contact me.

Highlights

Research updates

See my publication page and track on ORCID, Scholar and ResearchGate

Press & Media

Press release and social networks.

LabEX UnivEarthS

EROSAT - ERosion from geOchemistry and remote Sensing of lAndslides in the Tropics.

As a major agent of erosion and sediment supply to rivers, mass wasting are one of the most efficient physical processes shaping the Earth’s surface and is thus critical to landscape evolution. They promote the percolation of surface runoff in highly fragmented rock debris thereby creating favorable conditions for chemical weathering that is a major atmospheric carbon dioxide sink. EROSAT project aims to evaluate the role of slope instability in sediment and solute fluxes from watersheds, and to study their impact on the critical zone in tropical islands of Guadeloupe, where erosion and weathering rates are among the highest on Earth. By a combining an innovative multidisciplinary approach based on ObsEra data, geochemical analysis and multi-scale remote-sensing, EROSAT will lead to an analytical scaling between mass wasting and sediment/solute load in the river. Ultimately, EROSAT will deliver a quantitative modeling of the sediment and solute transport driven by mass wasting.

IPGP BQR

RainForeST – RAdiatIve traNsfert FOR assEssing Sediment Transport.

It is important first of all to have a good understanding of how sediment transport takes place in rivers. We know that fine particles represent an important fraction of the transported sediment mass (Syvitski & Saito, 2007). Suspended load is therefore an important factor in erosion. However, recent field measurements show that suspended fine particles interact with the bed (Misset et al., 2019). Based on this observation, it is therefore possible to develop a formalism of suspended transport that explicitly takes into account the exchange of fine particles between the bed and the water column. This approach makes use of three parameters which are : (1) a threshold water level above which the flow begins to erode the bed, (2) an erosion rate which characterises the intensity of sediment entrainment and (3) a characteristic sedimentation time. However, if river flow and turbidity are measured with a 5-minute time step, measurements of suspended solids concentration are sporadic since they require field sampling of sufficient water during a flood event to collect sufficient material transported by the river. The sediment (turbidity) load of a river or water body is measured using a laser light emitter/receiver instrument. The manufacturer is responsible for providing the calibration curves of its instrument (turbidity versus received intensity) and the user has no control over this calibration, nor can the user directly relate the true concentration of suspended matter to the turbidity measurement. Thus, until now, we have had to convert the turbidity signal into a suspended solids concentration from an empirical calibration curve that we have obtained from river samples (Fig. 1). However, such an approach does not take into account variations in the granulometry of the suspended matter since it integrates all the measurements made regardless of the collection period. Moreover, its non-linear nature implies a high uncertainty towards small values. We therefore propose to reproduce in the laboratory the measurement conditions in the field in order to establish a calibration based on physical considerations. This study could be completed by modelling the radiative transfer (Mobley, 2001).

Landbox

Vitae

Antoine LUCAS

Antoine LUCAS

Since 2017 CNRS Junior Research Scientist
2017 Research fellowship at IPGP 2015--2016 Research fellow at CEA 2013--2014 Post-Doc CNES 2010--2012 Post-Doc Caltech 2010 Ph.D Geophysics, IPGP

Highlights

Welcome to a highly talented post-doc

It is with great honour that we welcome Léa Bonnefoy, awarded of the 2020 L’Oréal-UNESCO Young Talents France Prize For Women in Science to our team @IPGP_officiel, @Univ_Paris. She will work on the preparation of the next mission on Titan, the @DragonflyTitan UAV.

Job Offer
Engineer in optical photogrammetry

As part of the LabEx UnivEarthS, the EROSAT "young team" project aims at evaluating on erosion induced sediment flux is highly steep regions such as tropical islands and mountainous areas. We seek for a research engineer, starting in January 21' for one year and working.
Interested individual should contact me.

New results on Titan's landscape

Chloé Daudon, a young researcher at @IPGP_officiel, has implemented a new photogrammetry approach for the reconstruction of the DTM at Huygens landing site, near Titan's equator.

This work is published in AGU's Earth and Space Science,
DOI: 10.1029/2020EA001127.

Say hello

Lamarck Office

Université de Paris Institut de physique du globe de Paris Planétologie et Sciences Spatiales

35 rue Hélène Brion
75013 Paris, France
contact - lucas @ ipgp . fr