Item: Test of a multiplex snow-depth sensor along a down slope
Title: Test of a multiplex snow-depth sensor along a down slope
Proceedings: Proceedings of the 1996 International Snow Science Workshop, Banff, Canada
Authors: G. Guyomarc'h, L. Merindol and M. Sudul, Meteo-France Centre d'Etudes de la Neige, 1441 rue de la piscine, F-38406 Saint Martin d'Heres Cedex, France, Phone: 33 0476637918 Fax 33047651 5346, e-mail: Gilbert.Guyomarch@meteo.fr
Abstract: For 2 years, the CEN (Centre d'Etudes de la Neige - Snow Study Centre) has been making snow depth measurements on a location of avalanche starting zone which undergoes snow transport by wind. The goal of this work is a refined study of the temporal evolution of a snow profile. The experimental site, already used for studies on blowing snow periods characteristics, is located in the French Alps near Grenoble, at an altitude of 2800 meters. A slope has been instrumented with a set of 7 snow-depth sensors using ultrasonic waves. These sensors have been set up between two pylons. The device delivers measurements every 15 minutes. Concurrently, monitoring of meteorological conditions is achieved on a nearby site. The first snow-depth records show that, in most cases, this equipment does not suffer from heavy snowfalls, hoar frost and strong wind velocity. However, statistical post-processing is needed to eliminate bad values. This experimental equipment is expected to provide a link between field observations of snow characteristics and our theoretical understanding of the necessary time to erode. or accumulate snow quantity according to snow-grain morphological features. This paper describes the development and experimental testing of the installation, then the observations used to correlate weather conditions, snow particles features with evolution of snow pack are presented.
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Keywords: automatic snow-depth profile, erosion rate, wind effect
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