Thaw Depth Progression in Response to Vehicle Disturbance
Steve Rewa
Relative plot locations and plot microtopography - Barrow, Alaska 2001. (Microtopography measured in meters above the lowest point. Points on plots represent sampling points. Map is unprojected).
Microtopography was measured at each of the grid points in mid June using a surveyor's level. Heights were recorded in meters above the lowest measured point.
Thaw depth for each point was recorded at 4 times during the summer of 2001 at July 13, July 23, Aug. 2, and Aug 12. Measurements were taken by forcing a metal shaft through the ground surface until permafrost was encountered. Depths were recorded in meters below the ground surface.
Thaw depth response to track presence was analyzed by calculating difference of means between on- and off-track points for the Aug. 12 measurement using a student's t-test.
Correlation between average end of season thaw depth per plot and average elevation per plot was conducted to determine the relationship of elevation and thaw depth at the plot level. Correlation between elevation and thaw depth for each point was calculated for all four measurements to determine the relationship between elevation and thaw depth at the point level and the change throughout the season.
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