I n s t r u m e n t s

a n d

M e t h o d s

FIRST OBSERVATIONS ON THE CORRELATIONWITH SNOW TRANSPORT BY WIND

relationbetween thedurationofsnowerosion(oraccu-
mulation)andtheweather parameters(essentiallywind
speed anddirection). As an example, the following graphs^{accumulation of snow and 4 & 5 for erosion. These phases}
represent a ten-day period,a typical accumulation due to^{are characterized by:}
snowfall and a period of erosion due to wind transport of^{1.The strengtheningof wind speed (blowing from South}
the snow. The curves of the 4 snow depth sensors are dis-^{Southwest) during the day of April 19th and the begin-}
playedonthefigure5.Concurrently,onfigure6,the^{ning of a snowfall.}
strengtheningof wind velocity and the shift of wind direc-^{2.During the night between April 19thand 20th,the tem-}
tion can be observed. The latter is strongly correlated with^{porary weakening of wind speed while a weak snow-}
the slope aspect to determine the wind velocity efficiency^{fall persists.}
on the snow pack.
During this period (between the middle of April 19 ^thand
the end of April 22^nd ),here are 5 main phases, 1,2 & 3 for

Figure 5: These first snow depth data display a snow transport period of 48 hours.

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