CGRG Bibliography of Canadian Geomorphology
Author : Smith, D.J.
Date : 1987
Title : Observations of turf-banked solifluction lobe geomorphometry
Publication : Albertan Geographer
Issue : 23:
Page(s) : 45-55
The purpose of this paper is to present the results of an investigation into the morphometric relationships exhibited by turf-banked solifluction lobes located in the southern Canadian Rocky Mountains. Although previous researchers have presented evidence suggesting that the morphometric characteristics of solifluction landforms has a genetic underpinning (Hall 1981, Heilbroon and Walton 1984), there is little appreciation for this relationship to turf-banked solifluction lobe morphogenesis. In the present study a number of distinctive morphometric elements were measured at 58 sites to ascertain their morphogenetic significance. The results of these surveys draw attention to the fact that the distinctive morphology of these lobes may, in part, represent a consistent response to an interplay of competing morphodynamic parameters. Specifically, these results suggest that changes in the geometry of these lobes represents a systematic morphological adjustment to the steepness of the local slope. Despite the fact that a wide range of lobe sizes was included within the survey, correlation analysis confirmed that all of the lobes were basically similar in form and shared common locational characteristics. For instance, most of the lobes (86.2%) were found on moderately steep slopes (18.8o +/- 6.1o) and displayed relatively consistent length to width ratios (mean 1:1.16). The strong correlation between lobe size and slope which emerged from this analysis is similar to that reported by Hall (1981) in a survey of stone-banked lobes on sub-Antarctic Marion Island. As Hall (1981) observed, there is a pronounced decrease in lobe size with increasing slope. This relationship is manifested by reduced horizontal dimensions and, intriguingly, by a general thickening of the deposit. In conclusion, these findings imply that slope and solifluction processes interact in such a manner that solifluction morphology is related to the local slope gradient.
Bibliography of Canadian Geomorphology