Downslope displacement rates of ploughing boulders in a mid‐alpine environment: finse, southern norway.

Abstract

Berthling, I., Eiken, T., Madsen, H. and Sollid, J.L., 2001: Downslope displacement rates of ploughing boulders in a mid-alpine environment: Finse, southern Norway. Geogr. Ann., 83 A (3): 103-116.ABSTRACT. Annual and seasonal displacements of ploughing boulders were investigated at Finse, southern Norway, by traditional surveying and differential carrier-phase global positioning system measurements. Annual displacement rates were mainly below 10 mm/year, although one particular season showed rates of 26 mm/year on average. There was a tendency for larger boulders to travel faster. Seasonal displacements were restricted to the annual freeze-thaw cycle. The frost heave seems to have a significant horizontal component, which does not necessarily point in the downslope direction. Thus, the concept of frost creep is not applicable to the investigated ploughing boulders. On the other hand, due to tilting of the boulders, a momentum may be gained during thaw consolidation that could induce downslope displacements. Such a process will work together with gelifluction.

Estimating velocity from noisy GPS data for investigating the temporal variability of slope movements

“…Roer et al, 2008;Arenson , 2003). In addition, thaw consolidation might have further increased the amount of surface lowering and the rotation of the boulder (Berthling et al, 2001), however, its contribution might be minor (Brommer et al, 2012).…”

Linking debris-flow hazard assessments with geomorphology

“…In addition to creep, downslope movement of single boulders might be important too. Downslope displacement rates of single boulders in southern Norway range from 5 to 7 mm per year, with maximum rates of 26 mm/yr (Berthling et al, 2001). In the Canadian Arctic, Washburn (1999) has measured over a 10-year period an average displacement of 28 mm/yr on a 78 slope.…”

Distribución Y Caracterización De Bloques Aradores en El Noroeste De La Península Ibérica: El Alto Sil Y El Macizo De Vizcodillo

“…Los bloques aradores se forman únicamente en ambientes periglaciares, bien sea por la existencia de permafrost o de hielo estacional (TUFNELL, 1972;CHATTOPADHYAY, 1983;BERTHLING et al, 2001a;2001b), si bien algunos autores consideran que, al menos en algunos casos, podrían estar asociados a procesos únicamente solifluidales (GARCÍA RUIZ et al, 1990;SERRANO CAÑADAS, 1998). De ahí que se puedan considerar indicadores de este tipo de ambientes, siempre que se pueda corroborar su actividad actual.…”

“…Al avanzar, los bloques tienden a alinearse lentamente en la orientación de las laderas, siguiendo la línea de máxima pendiente (BERTHLING et al 2001a;BALLANTYNE, 2001), aunque no faltan los bloques orientados transversalmente a la misma (CHATTOPADHYAY, 1983).…”