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Rain and snow remote sensing in high mountain regions for improved water resources and hydrological risk assessment

par Encadrants de stages - 8 septembre 2017

Laboratoire de rattachement : Institut des Géosciences de l’Environnement, équipe HMCIS, Grenoble

Encadrant : Guy Delrieu (guy.delrieu@univ-grenoble-alpes.fr)

Téléphone : 04.76.63.54.62

Mots clés : hydrometeorology, weather radar, quantitative precipitation estimation, high mountain

Contexte et objectifs de la mission de stage :

This Master topic is proposed within a project aimed at developing advanced methods for snow and rain estimation in high mountain regions. It relies on a unique observation system composed of two X-band Doppler and polarimetric weather radars installed over an altitude gradient (200 and 1900 m ASL) in the region of Grenoble. The project is carried out by the HMCIS team in collaboration with Météo-France and LTE/EPFL (Lausanne, Switzerland).
The first objective is the characterization of the 4D structure of precipitation within the Grenoble intermount basin using volumetric multi-parameter radar measurements, as well as hydrometeor size and speed distribution sensors at ground level. Focus is given on the vertical position of the 0°C isotherm and the extension of the melting layer since they produce a specific signature for radar remote sensing (bright band) and determine the rain/snow occurrence at ground level.
The second objective is the quantitative assessment of the rain/snow estimates at ground level. Several aspects are studied, including (1) capability of the high-elevation radar to detect summer convective heavy rain events at the regional scale, (2) added value of the low-elevation radar for regular and heavy rainfall estimation in the Grenoble city, (3) radar capability for estimating winter snow accumulation at high altitudes. Such assessments rely on existing raingauge networks and the Météo France snow research station at Col de Porte (1160 m).
The MR2 topic will be precisely defined with the candidate to account for his/her interests and skills, as well as to account for the project advancement at the beginning of the training period (February 2018). A PhD funding, jointly by the French Ministry of Environment and Labex osug@2020, will be searched in 2017-2018 for the continuation of the Master work.

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