Skills

Scientific programming
Working with datasets with millions of data, I developed a specific tool to manage varied raw data sources and aggregate them into an unified framework. Such database has then be exploited with multiple numerical, statistical and probabilistic approaches. Modeling and signal processing were performed as well. I mainly coded in Python (22,000 lines) and Matlab (7,000 lines) but I have a basic knowledge of R, HTML and PHP languages.
Hydro-sedimentary monitoring
Good science equals good data. In order to study glacial erosion, I measured hydro-sedimentary parameters in the vicity of a glacier. In this kind of challenging environment, I participated in the installation of 3 hydro-sedimentary monitoring stations. Data acquired by these data-loggers were transmitted back to the lab and allowed checking their good functioning on a day-to-day basis. Some of these stations have been maintened for 5 years.
Sediment tracking
Estimating erosion fluxes requires to determine sediment sources and transfer times. During my thesis, I deciphered the origin of the fine-grained glacial sediment by measuring cosmogenic nuclide concentrations. My work also showed that coarse particle transport mechanisms can be investigated using radio-frequency identified (RFID) pebbles. Such tracers have been monitored using mobile and static antennas in difficult field conditions.

Research interests

During my PhD thesis, I studied what processes control present-day erosion in a glaciated catchment. Answering this scientific question provides insight for sediment flux during the Quaternary glacial cycles as well as a predictive information for present-day global climate change and the associated glacial retreat. I focused on deciphering erosion processes within one particular catchment in Mont-Blanc massif and quantified erosion from rockwalls above the glacier, from substratum beneath the ice and from the hillslopes and alluvial area downstream from the glacial tongue. This works relied on a combination of various methods : high-resolution monitoring of sediment flux, radio-frequency identification of pebble, cosmogenic nuclides content and probabilistic approaches. I am now seeking a post-doctoral fellowship in order to investigate one of the following topic :
PARAGLACIAL SEDIMENT DYNAMICS
What are the characteristic time scales for the storage and release of sediments in proglacial areas? What is the role of extreme events in such paraglacial remobilization? At the decadal timescale, what processes control the evolution of sediment fluxes in proglacial environments?
SUBGLACIAL EROSION PROCESSES
How does the seasonal development of the drainage system beneath a glacier control the subglacial erosion processes? At a short timescale, how do ice dynamics relate to subglacial erosion?
STOCHASTIC BEDLOAD TRANSPORT
Can the long term flux of coarse grained sediment be constrained from a probabilistic model of bedload transport? From tracer positions measured in a natural setting, how can the entrainment probability be linked to hydrodynamic parameters?

Teaching

During two years, I was recruited as a teaching assistant for the Physics department of Université Savoie Mont-Blanc. I taught directed sessions and lab works to first and second years engineering students as well as to college undergraduates. I was involved in teaching the following topics : Newtonian mechanics, continuum mechanics, geophysics and thermodynamics. As an additional work, I wrote two syllabus of 70 and 110 pages, respectively. Each contained detailed exercises corrections and supplementary material to help students overcome some of the issues they encountered. Finally, I produced exam subjects, participated to the pedagogical discussions with the physics department members, graded exams and lab works, and supervised 4 undergraduate internships.

Contact

Hervé Guillon
Hervé Guillon

Research Scholar at the University of California, Davis (USA)

herve@guillon.xyz