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1 October 2018 Geomorphic Evidence of Holocene Slope Dynamics on the Canadian Shield – a Study from Lac à l'Eau-Claire, Western Nunavik
Armelle Decaulne, Najat Bhiry, Julien Lebrun, Samuel Veilleux, Denis Sarrazin
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Abstract

We present the results of a study of the morphometric properties of a talus slope in subarctic Quebec (Nunavik) using field-based methods, including geomorphological, granulometric and plant distribution surveys, and statistical analyses. Slope processes are currently active, despite the limited altitudinal difference between the apical-to-distal parts of the slope and the imminent depletion of the debris supply. The near-rectilinear long profiles of the talus highlight the distribution of debris across the slope and demonstrate that free-fall of rock fragments is not the only process operating (redistribution is higher in the westernmost profile, which exhibits a clear concave shape). The spatial distribution of vegetation covering the screes highlights the recent age of parts of the talus, showing that present-day processes are still active, although limited. The short remaining apical rockwall highlights the shortage of debris following deglaciation, as debris are mostly supplied by freeze-thaw processes to the talus, and are then reworked by other processes which need to be better defined in subsequent research.

2018 Université Laval
Armelle Decaulne, Najat Bhiry, Julien Lebrun, Samuel Veilleux, and Denis Sarrazin "Geomorphic Evidence of Holocene Slope Dynamics on the Canadian Shield – a Study from Lac à l'Eau-Claire, Western Nunavik," Ecoscience 25(4), 343-357, (1 October 2018). https://doi.org/10.1080/11956860.2018.1431376
Received: 26 July 2017; Accepted: 18 January 2018; Published: 1 October 2018
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KEYWORDS
éboulis
gélifraction
Nunavik
scree
slope dynamics
Talus
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