Home > Publications . Search All . Browse All . Country . Browse PSC Pubs . PSC Report Series

PSC In The News

RSS Feed icon

Sastry's 10-year study of New Orleans Katrina evacuees shows demographic differences between returning and nonreturning

Stafford says less educated, smaller investors more likely to sell off stock and lock in losses during market downturn

Chen says job fit, job happiness can be achieved over time

Highlights

Deirdre Bloome wins ASA award for work on racial inequality and intergenerational transmission

Bob Willis awarded 2015 Jacob Mincer Award for Lifetime Contributions to the Field of Labor Economics

David Lam is new director of Institute for Social Research

Elizabeth Bruch wins Robert Merton Prize for paper in analytic sociology

Next Brown Bag

Monday, Oct 12
Joe Grengs, Policy & Planning for Social Equity in Transportation

Solifluction Steps and Risers, Lee Ridge, Glacier National park, Montana, USA: A Scale and Pattern Analysis

Publication Abstract

Walsh, S.J., L. Bian, S. McKnight, Daniel Brown, and E.S. Hammer. 2003. "Solifluction Steps and Risers, Lee Ridge, Glacier National park, Montana, USA: A Scale and Pattern Analysis." Geomorphology, 55(1-4): 381-398.

Solifluction patterns on Lee Ridge, Glacier National Park, Montana, USA, were characterized through a combination of field transects, enhanced, digital aircraft data, and geostatistics. The objectives were to (i) assess the role of high spatial resolution digital imagery for mapping the areal extent and spatial pattern of solifluction steps and risers through digital enhancements [i.e., principal components analysis (PCA) and wavelet transforms (WTFs)] of ADAR-5500 aircraft imagery; (ii) describe the pattern of solifluction steps and risers through the placement of twelve 50-m field transects oriented normal to the steps and risers and organized along an elevational gradient extending from highest to lowest positions along the ridge; (iii) define scale dependent relationships of the solifluction steps and risers mapped along one-dimensional field transects and two-dimensional remote sensing images using indicator semivariograms to define the structure of the spatial data across a range of sampled scales; and (iv) relate the solifluction patterns observed through the transects and the remote sensing interpretations to topographic trends associated with distance from the dominant peak, a proxy for elevation change along Lee Ridge. Findings suggest that the semivariance pattern of the transects changes with elevation, that is the semivariograms of the lower transects show smaller amplitudes and shorter wavelengths than those at higher elevations, and the pattern of steps and risers from the enhanced ADAR-5500 images indicate less variation in the semivariance with elevation than represented in the field transects.

DOI:10.1016/S0169-555X(03)00151-X (Full Text)

Browse | Search : All Pubs | Next