Wind patterns are crucial factors to be considered in the design of artificial clearings in the forest to trap and retain snow. Winds at Marmot Creek during snowfall are predominantly southeasterly but are quite light; over 80% of the snow falls with winds less than 4.5 m/s. Maximum winds occur between snowfalls, and favor the southwest to northwest quadrant. The average maximum hourly wind per month is less than 7 m/s in the lower reaches but increases with elevation to 16 m/s at treeline.
For a 19-day period in July 1967, daily estimates of evapotranspiration were obtained from hourly calculations of the Bowen ratio above the forest canopy. The estimates ranged from 7.9 mm to 1.5 mm. The Bowen ratio was found to be very dependent on wind direction, sky condition, and basin aspect, which was a significant factor. Although the area is unhomogeneous, the results appear reasonable when compared with other estimates of evapotranspiration.
The meteorology of a mountainous watershed in the Alberta Rockies is shown to be strongly influenced by upslope‐downslope diurnal wind circulations during rain‐free periods of observation in August, 1965. The evapotranspiration from the forest is inferred from measurements of net radiation above the canopy and from vertical temperature gradients obtained from an 80‐ft tower. The forest water loss during August rain‐free periods is estimated to be between 0.15 and 0.6 gm/cm2/day with high confidence, or between 0.25 and 0.48 gm/cm2 with somewhat less confidence. A ‘best’ engineering estimate of evapotranspiration is 0.3 gm/cm2/day.
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