The effect of topography, latitude, and lithology on rock glacier distribution in the Lemhi Range, central Idaho, USA

Johnson, Bradley G.; Thackray, Glenn D.; Kirk, Robert Van

doi:10.1016/j.geomorph.2007.01.023

Cited by 65 publications

(58 citation statements)

References 25 publications

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“…One surprising result was the population of G&PS in Idaho. The mountain ranges were glaciated during the last ice age, and rock glaciers are common (Butler, 1988;Hostetler and Clark, 1997;Thackray et al, 2004;Johnson et al, 2007). A review of the scientific literature revealed that Meier and Post (1962) identified six glaciers in the Sawtooth Range, close to our estimate of seven glaciers.…”

Section: Discussionsupporting

confidence: 73%

Twentieth Century Glacier Change on Mount Adams, Washington, USA

2010

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Section: Discussionsupporting

confidence: 73%

Twentieth Century Glacier Change on Mount Adams, Washington, USA

2010

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“…Previous similar studies, such as Johnson et al (2007), propose that lithology could affect rock glacier distribution through influences on hydrology and thermal ventilation, which is a possibility to consider for the studied area. French (2007) considers the geological information an important factor, because lithology controls the capacity of rock glaciers to develop or conserve; while Ikeda and Matsuoka (2006) show that pebbly and boulder material has an influence on the degree of ridges and furrows developed on periglacial landforms surfaces.…”

Section: Discussionmentioning

confidence: 90%

“…Periglacial environment (Tricart, 1968;French, 2007) is particularly frequent and well developed in dry and continental mountain areas (Brenning and Trombotto, 2006). Their distribution has been studied by several authors (Brenning et al, 2007;Johnson et al, 2007;Esper Angillieri, 2010). The impact of climatic factors upon a periglacial environment, mainly temperature and precipitation, has been studied by Brazier et al (1998); Humlum (1998); Brenning (2005); Brenning and Trombotto (2006) and Azócar et al (2016).…”

Section: Introductionmentioning

confidence: 99%

Impact of natural parameters on rock glacier development and conservation in subtropical mountain ranges. Northern sector of the Argentine Central Andes

Forte

Villarroel

Angillieri

2016

Preprint

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Abstract. This paper presents a detailed rock glacier inventory used in determining how the various natural parameters 10 affect a mountain periglacial environment. This study was undertaken in a northernmost sector of the central Argentine Andes, in an area stretching between 31°02´and 31°22´S latitude. This is a high and arid subtropical region where permafrost and cryogenic processes are predominant, featuring as well as a large number of rock glaciers and associated periglacial landforms. Rock glaciers inventory was based on geomorphological characterization with optical remote sensing data and field description information. The study region covers 630 km 2 , with 3,25 % of this area showing 402 rock glaciers 15 and protalus rampart features. In total, 172 rock glaciers have been identified, 48 of which are considered active. In such a sector, the protalus rampart range shows the largest landform occurrences, though fossil and inactive rock glaciers are usually larger and are developed over a larger attitudinal distribution. Based on previous studies, we have considered that the study of active rock glaciers is an effective approach to assess the current state of periglacial environment evolution. the annual potential solar radiation show high values but there is not any significant difference between landform and, therefore, it is scarcely influential. The research is carried out over a high mountain area where poor accessibility hindered the chances for obtaining systematic data on weather and environment. A simple and low coast methodology was used to analyse an area where no studies on rock glacier distribution had been made before. This information gains special importance because Argentina has recently instituted a national law for glacial and periglacial environment protection and 30The Cryosphere Discuss.,

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“…Lithological influences on rock glacier distribution have been identified by many authors (e.g., Johnson et al, 2007). Matsuoka and Ikeda (2001) observed that crystalline rockwalls tend to produce coarser debris, resulting in "blocky" rock glaciers, while shales rockwalls produce finer debris, resulting in "pebbly" rock glaciers.…”

Section: Lithological Influencementioning

confidence: 99%

Permafrost Favorability Index: Spatial Modeling in the French Alps Using a Rock Glacier Inventory

et al. 2017

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In the present study we used the first rock glacier inventory for the entire French Alps to model spatial permafrost distribution in the region. Climatic and topographic data evaluated at the rock glacier locations were used as predictor variables in a Generalized Linear Model. Model performances are strong, suggesting that, in agreement with several previous studies, this methodology is able to model accurately rock glacier distribution. A methodology to estimate model uncertainties is proposed, revealing that the subjectivity in the interpretation of rock glacier activity and contours may substantially bias the model. The model highlights a North-South trend in the regional pattern of permafrost distribution which is attributed to the climatic influences of the Atlantic and Mediterranean climates. Further analysis suggest that lower amounts of precipitation in the early winter and a thinner snow cover, as typically found in the Mediterranean area, could contribute to the existence of permafrost at higher temperatures compared to the Northern Alps. A comparison with the Alpine Permafrost Index Map (APIM) shows no major differences with our model, highlighting the very good predictive power of the APIM despite its tendency to slightly overestimate permafrost extension with respect to our database. The use of rock glaciers as indicators of permafrost existence despite their time response to climate change is discussed and an interpretation key is proposed in order to ensure the proper use of the model for research as well as for operational purposes.

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The effect of topography, latitude, and lithology on rock glacier distribution in the Lemhi Range, central Idaho, USA

Cited by 65 publications

References 25 publications

Twentieth Century Glacier Change on Mount Adams, Washington, USA

Twentieth Century Glacier Change on Mount Adams, Washington, USA

Impact of natural parameters on rock glacier development and conservation in subtropical mountain ranges. Northern sector of the Argentine Central Andes

Permafrost Favorability Index: Spatial Modeling in the French Alps Using a Rock Glacier Inventory

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