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

PSC In The News

RSS Feed icon

COSSA makes 10 suggestions to next Administration for supporting and using social science research

Thompson says US prison population is 'staggeringly high' at about 1.5 million, despite 2% drop for 2015

Levy et al. find Michigan's Medicaid expansion boosted state's economy while increasing number of insured

More News

Highlights

2017 PAA Annual Meeting, April 27-29, Chicago

NIH funding opportunity: Etiology of Health Disparities and Health Advantages among Immigrant Populations (R01 and R21), open Jan 2017

Russell Sage 2017 Summer Institute in Computational Social Science, June 18-July 1. Application deadline Feb 17.

Russell Sage 2-week workshop on social science genomics, June 11-23, 2017, Santa Barbara

More Highlights

Next Brown Bag

Mon, Jan 23, 2017 at noon:
Decline of cash assistance and child well-being, Luke Shaefer

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 G. 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