Predicting profiles of snowdrifts in topographic catchments

A regression model was developed that requires only terrain data to estimate snowdrift profiles. Results from sites in Wyoming and Colorado show drift slopes to be influenced by the terrain from 45 m (150 ft) upwind to an equal distance downwind of the catchment lip. Observed drift profiles are closely duplicated when the regression equation is used to predict the slope of successive profile increments. Results are compared to those of Finney's wind tunnel experiments.The Wyoming Highway Department is presently making this analysis a part of their earthwork computer program to help design drift-free roads. Among many other possible applications is the development of criteria for reshaping strip-mined terrain to maximize on-site retention of snowfall and regulate its areal distribution. A progam listing is given for the Hewlett-Packard 9820A calculator and 9862A plotter.