HR: 0800h
AN: H21B-0510    [Abstracts]
TI: Comparison of two years of snowmelt infiltration using electrical resistivity and TDR
AU: * French, H K
EM: helen.french@bioforsk.no
AF: Norwegian institute of Agriculture and Environmental Research (Bioforsk), Soil and Environment Division, Frederik A. Dahlsvei 20, Ås, 1432, Norway
AU: Binley, A
EM: a.binley@lancs.ac.uk
AF: Department of Environmental Science, Lancaster Environment Centre, Lancaster University, Lancaster, LA1 4YQ, United Kingdom
AU: Leijnse, A
EM: toonleijnse@gmail.com
AF: Department of Environmental Sciences, Division of Soil Science, Wageningen University, P.O. Box 47, Wageningen, 6700AA, Netherlands
AB: Infiltration during snowmelt can be highly heterogeneous due to the formation of ice on the ground surface below the snow cover. In cases where snow is contaminated such as e.g. along highways and airports due to de-icing agents and other contaminants, it is important to be able to predict the zone of infiltration since this will determine the potential for retention and degradation in the unsaturated zone. The infiltration processes was monitored using time-lapse electrical resistivity measured in shallow electrodes in a glacial deposit near Oslo airport. TDR measurements were used to calibrate changes in water contents with changes in electrical resistivity values. In the first snowmelting event (April, 2006) there was hardly any ground frost, while in the second event (March, 2007) ground frost caused redistribution of meltwater and focussed infiltration. The observed infiltration pattern is supported by numerical simulation of infiltration in a 2D unsaturated profile.
DE: 0545 Modeling (4255)
DE: 0704 Seasonally frozen ground
DE: 0740 Snowmelt
DE: 1838 Infiltration
DE: 1875 Vadose zone
SC: Hydrology [H]
MN: 2007 Fall Meeting