Item: Liquid water distribution at the snow-soil interface
Title: Liquid water distribution at the snow-soil interface
Proceedings: Proceedings of the 1994 International Snow Science Workshop, Snowbird, Utah, USA
Authors: Denoth A., Eller J., and A. Gschnitzer, Institute of Experimental Physics, University ofInnsbruck, A-6020 Innsbruck, Phone: (#43) 512-218-6317; Fax: (#43) 5J2-218-2921
Abstract: Hydraulic 'permeability changes drastically at the snow-soil interface and this affects significantly the amount and distribution of liquid water in the adjacent regions, Snow wetness has been measured using flat (plate-like) capacitive sensors with a spatial resolution of ±1.3 cm; the water content in the soil has been determined using a recently developed capacitive sensor with a fork-like geometry. This new wetness sensor can easily be inserted even in compact and hard types of soils. The spatial resolution of the soil wetness sensor is approximately ±1.5 cm; wetness is measured in a volume of =50 cm3. In order to be more or less independent on the type of soil, a relative high frequency of 32.0 MHz for sensor operation has been selected. At this high frequency a simple relation between volumetric soil wetness and dielectric permittivity has been found experimentally, whereby soil wetness has been measured using the standard thermo-gravimetric method. The snow wetness sensors, however, are operated at a frequency of 20.0 MHz. Measurements of high-resolution vertical profiles of snow and soil wetness and wetness gradients near the snow-soil interface are reported.
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Keywords: snow wetness, soil, calibration
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