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Reference : UMR5001-VALLAN0-031
Workplace : ST MARTIN D HERES
Date of publication : Wednesday, February 12, 2020
Type of Contract : FTC Scientist
Contract Period : 12 months
Expected date of employment : 1 April 2020
Proportion of work : Full time
Remuneration : 2617 € minimum (experience desired from 0 to 2 years).
Desired level of education : PhD
Experience required : 1 to 4 years
Characterizing the atmospheric scenarios governing torrential floods and debris flows in the Northern French Alps.
The HYDRODEMO project is a collaborative research project between INRAE (Grenoble/Aix en Provence) and IGE (Grenoble). It aims at better understanding the risks associated with torrential floods and debris flows in the Northern French Alps in order to be able to better protect against them. Torrential phenomena are dangerous both due to the very sudden reaction of the rivers and due to their load of solid material. However, there is a critical lack of knowledge about this type of hazard, which has the particularity of occurring on very local scales (catchment areas of 1 to 100 km2). The various actions of HYDRODEMO should make it possible to model the hydrology, hydrometeorology and solid transport related to this type of hazard for all the small catchment areas of the territory. This new scientific knowledge will enable a better understanding of the phenomena associated with torrential hazards, as well as a better prevention and improved warning to the population.
The project proposed here aims to characterize the atmospheric scenarios that have caused the most severe torrential floods in the Grenoble region these last decades.
The analysis of atmospheric sequences will first be based on pressure fields over south-western Europe. It will provide a synthetic description of the pressure fields preceding the torrential reactions by two ways:
1. by relating the reaction dates to the EDF weather types (Garavaglia et al 2010) which have been established specifically for the description of extreme rainfall in the south of France and for which a chronology going back to 1948 is available.
2. by relating the reaction dates to synoptic patterns. This approach proposes to use the shape and speed of deformation of pressure fields that strongly condition extreme cumulative rainfall over the Isère basin in Grenoble (Blanchet et al., 2018, Blanchet et al. 2020). It will be studied whether these parameters are also discriminating for extreme rainfall events on a smaller spatio-temporal scale.
In a second step, it will be assessed whether the consideration of other synoptic variables such as moisture fluxes can improve the discrimination of extreme accumulations at different spatial scales.
Finally, it will be investigated to what extent the frequencies of these generating atmospheric situations explain the frequencies of torrential reactions in different types of watersheds, based on a typology of watersheds in the region produced within the HYDRODEMO project.
Blanchet, J., Stalla, S., Creutin, J.D., 2018. Analogy of multiday sequences of atmospheric circulation favoring large rainfall accumulation over the French Alps. Atmospheric Science Letters, 19(3).
Blanchet, J., Creutin, J.D., 2020. 'Explaining rainfall accumulations over several days in the French Alps using low-dimensional atmospheric predictors based on analogy', Journal of Allpied Meteorology and Climatology, à paraître.
Garavaglia, F.; Gailhard, J.; Paquet, E.; Lang, M.; Garcon, R. & Bernardara, P. (2010), 'Introducing a rainfall compound distribution model based on weather patterns sub-sampling', Hydrology and Earth System Sciences 14(6), 951—964.
PhD in earth or climate sciences, with a good knowledge of climatology and statistics. A good knowledge of the software R is also required.
The Institut des Géosciences de l'Environnement (IGE) is a public research laboratory under the supervision of CNRS/INSU, IRD, Grenoble Alpes University (UGA) and Grenoble-INP.
It brings together about 240 people, including 145 permanent members (researchers, teacher-researchers, engineers) and about 95 doctoral students, post-doctoral fellows and staff on fixed-term contracts. The laboratory also welcomes several dozen trainees and scientific visitors every year. The laboratory is located on three sites of the Grenoble University Campus (Molière, OSUG-B, and Bergès sites).
The IGE is one of the main laboratories of the Observatoire des Sciences de l'Univers de Grenoble (OSUG) which is a federative structure of the INSU.
Constraints and risks
The research will be conducted in either French or English, however it is expected that the non-French speaking candidate will make his or her best to learn the basics of French in order to facilitate communication and integration into the laboratory.
An increase in salary may be considered based on the candidate's experience.
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