期刊
GEOMORPHOLOGY
卷 306, 期 -, 页码 325-335出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.geomorph.2017.04.005
关键词
Rockwall retreat rate; Terrestrial cosmogenic nuclide (TCN); Terrestrial laser scanning (TLS); Rockfall
资金
- Universitat Politecnica de Catalunya-BarcelonaTech
- Spanish Economy and Competitiveness Ministry [BIA2013-42582-P]
- European Union [SOE1/P2/F157]
Cliff erosion may be a major problem in settled areas affecting populations and producing economic and ecological losses. In this paper we present a procedure to calculate the long-term retreat rate of a cliff affected by rockfalls in the Montsec Range, Eastern Pyrenees (Spain). It is composed of low, densely fractured limestones; and the rockwall is affected by rockfalls of different sizes. The rockfall scars are clearly distinguishable by their regular. boundaries and by their orange colour, which contrast with the greyish old reference surface (S-0) of the cliff face. We have dated different stepped surfaces of the rockwall, including S-0, using cosmogenic Cl-36. The total amount of material released by rockfall activity was calculated using a high definition point cloud of the slope face obtained with a terrestrial laser scanner (TLS). The present rockwall surface has been subtracted from the reconstructed old cliff surface. This has allowed the calculatidn of the total volume released by rockfalls and of the retreat rate. The latter ranges from 0.31 to 0.37 mm.a(-1). This value is of the same order of magnitude as that obtained by other researchers in neighbouring regions in Spain, having similar geology and affected by rockfalls. (C) 2017 Elsevier B.V. All rights
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