Mesure de la densité de la neige à partir de ses propriétés acoustiques
| Autor: | F. Touvier, O. Marco, P. Villemain |
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| Rok vydání: | 1998 |
| Předmět: | |
| Zdroj: | La Houille Blanche. 84:117-123 |
| ISSN: | 1958-5551 0018-6368 |
| DOI: | 10.1051/lhb/1998071 |
| Popis: | Today, it is possible to measure the density of the snow by different, ways; attenuation of gamma rays, absorption of electromagnetic waves... In this paper, we suggest a simple method to estimate the density of the snow from its acoustic properties. After some basic recalls about the propagation of the sound in a continuous medium, we show the links observed from laboratory experiment, between the density and the acoustic parameters of the snow. A good correlation is found between the density and the modulus of the impedance. The use of a mathematical model of the propagation of an acoustic wave through a porous medium allows us to calculate the density of the snow from its acoustic, porosity. Therefore, it will be easier for field measurements and more efficient to use a simple method based on the empirical relations which we obtained and we propose the principle of an acoustic sensor to estimate in the snow cover, the density of the snow. |
| Databáze: | OpenAIRE |
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