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Geodynamic processes on sandy slope gullies in central Spain field observations, methods and measurements in a singular system

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Lucía Vela, Ana and Laronne, Jonathan and Martín Duque, José Francisco (2011) Geodynamic processes on sandy slope gullies in central Spain field observations, methods and measurements in a singular system. Geodinámica acta, 24 (2). pp. 61-79. ISSN 0985-3111

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Official URL: http://www.tandfonline.com/toc/tgda20/current



Abstract

Gullies developed on sandy lithologies are scarce and few studies have been reported on these landscapes. This paper presents an approach
to study such singular landforms. The studied gullies appear on the slopes of a group of mesas and cuestas of Upper Cretaceous sediments
located in the Northern piedmont of the Guadarrama Mountains, Spain.
Landforms of these gullied areas were catalogued, characterized and quantified with reconnaissance methods, providing information
about the most active geomorphic processes. These are being monitored in a 1.32 ha representative gullied catchment, the Barranca de los
Pinos. In its high gradient slopes, where mass movements occur, high resolution topographical surveys are being carried out by Terrestrial
Laser Scanning (TLS). On low gradient slopes, runoff and rain splash are being monitored in micro plots; and in the main channel, sediment
transport and water discharge are being measured.
This ensemble of methods, some of them novel, is providing patterns of sediment movement within the gully system, and a hypothesis of
high activity rates has been confirmed. High gradient sand slopes without carbonate caprock erode fourfold compared to the capped slopes.
In the low gradient slopes, those ungullied produce more runoff while exposed sands yield more sediment; sands covered by litter produce
the least runoff and sediment. Notably, this catchment yields mainly bedload.


Item Type:Article
Uncontrolled Keywords:Soil, Size distribution, Wind erosion, Tunisia
Subjects:Sciences > Geology > Geodynamics
ID Code:20397
Deposited On:12 Mar 2013 13:31
Last Modified:12 Mar 2013 13:31

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