Grégoire Guillet

Grégoire Guillet
University of Washington Seattle | UW · Department of Civil and Environmental Engineering

PhD - Glaciology

About

13
Publications
2,075
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29
Citations
Introduction
As a glaciologist at the University of St Andrews, I study recent (2000-present) changes in Himalayan cryosphere, with a emphasis on unstable glaciers (surging etc.). My current focus is on developing new physics-based probabilistic frameworks for uncertainty estimation of glacier mass changes based on DEM difference. Coupling glacier physics and data-related error modeling within a unified framework is crucial to better constrain glacier changes derived from remote sensing methods.

Publications

Publications (13)
Article
Knowledge about the occurrence and characteristics of surge-type glaciers is crucial due to the impact of surging on glacier melt and glacier-related hazards. One of the super-clusters of surge-type glaciers is High Mountain Asia (HMA). However, no consistent region-wide inventory of surge-type glaciers in HMA exists. We present a regionally resolv...
Preprint
Full-text available
Knowledge about the occurrence and characteristics of surge-type glaciers is crucial due to the impact of surging on glacier melt and glacier related hazards. One of the "super-clusters" of surge-type glaciers is the mountains of Asia. However, no consistent region-wide inventory of surge-type glaciers in High Mountain Asia exists. We present a reg...
Article
Full-text available
The current paper studies the dynamics and age of the Triangle du Tacul (TDT) ice apron, a massive ice volume lying on a steep high-mountain rock wall in the French side of the Mont-Blanc massif at an altitude close to 3640 m a.s.l. Three 60 cm long ice cores were drilled to bedrock (i.e. the rock wall) in 2018 and 2019 at the TDT ice apron. Textur...
Conference Paper
Full-text available
The intensity of the current climate change has strong consequences on high mountain tourism activities. Winter activities are currently the most studied (ski industry). However, the consequences of environmental changes are also strong in summer, as geomorphological processes are enhanced at high elevation. The Mont Blanc Massif (Western Alps) is...
Article
Full-text available
Deglaciation of high mountain rockwalls alters slope stability as rockwalls become more sensitive to modifications in environmental factors (e.g. seasonal temperature variations). In the past decades, increasing efforts focused on studying deglaciated Alpine rockwalls. Yet, currently deglaciating rockfaces remain unstudied. Here, we quantify surfac...
Article
Full-text available
Large collections of images have become readily available through modern digital catalogs, from sources as diverse as historical photographs, aerial surveys, or user-contributed pictures. Exploiting the quantitative information present in such wide-ranging collections can greatly benefit studies that follow the evolution of landscape features over...
Conference Paper
Full-text available
In the current context of climate change, with huge effects on high mountain areas, knowledge of emerging natural hazards as well as information and awareness policies on such hazards are priorities for local authorities who must manage these risks. Thus, with the objective of improving the resilience of mountain communities facing emerging risks,...
Conference Paper
Full-text available
Permafrost-affected rockwalls can suffer from mechanical fatigue related to thermo-cryogenic processes. However, these processes, the rock slope kinematics, and the links between both remain largely unclear. This study reports five years of crackmeter measurements at 2-hours resolution from six of the main perennially ice-filled rock clefts at the...
Conference Paper
The dynamics and mass balance of the major glaciers of the Mont Blanc massif have been thoroughly studied since the 20th century. Areas of ice/snow cover (ISCs) located on steep rock faces as part of the high mountain cryosphere have, so far, not been extensively studied, likely in part because of their in-accessibility. The study of ISCs is noneth...
Poster
Full-text available
Dynamics and evolution of the major glaciers of the Mont-Blanc massif have been vastly studied since the XXth century. Ice/snow covers on steep rock faces as part of the cryosphere however remain poorly studied with only qualitative descriptions existing. The study of ice/snow covers is primordial to further understand permafrost degradation throug...
Book
Full-text available
Unlike the superficial deposits in which the presence of permafrost is indicated by geomorphological evidences, its occurrence in the rock walls can only be suggested by the existence of perennial ice sheets or hanging glaciers. Everywhere else, only indirect (geophysics) or direct temperature measurements make it possible to verify its presence. I...

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Projects

Projects (2)
Project
Uncertainty is a primordial question in inverse problems. Mono-photogrammetry, or monoplotting, is an ill-posed inverse problem that aims at providing a spatial reference to a non-referenced image file, using a DEM. This problem is usually addressed using linearization of colinearity equations and least-square methods. This however does not provide insights on the uncertainty. The aim of this project is to provide a python code solving the monoplotting inverse problem by using a Bayesian framework in order to provide a complete uncertainty study. This code will later be used in order to study the evolution of high mountain ice-snow covers and hanging glaciers in the Mont-Blanc massif, France.