Please use this identifier to cite or link to this item: http://hdl.handle.net/10553/44200
Title: Correlation of aeolian sediment transport measured by sand traps and fluorescent tracers
Authors: Cabrera, Laura L. 
Alonso, Ignacio 
UNESCO Clasification: 250618 Sedimentología
251010 Procesos litorales o sublitorales
250607 Geomorfología
Keywords: Transport rate
Sand traps
Fluorescent tracer
Wind speed
Nebkha
Issue Date: 2010
Journal: Journal of Marine Systems 
Conference: 1st International Symposium on Marine Sciences 
Abstract: Two different methods, fluorescent tracers and vertical sand traps, were simultaneously used to carry out an aeolian sediment transport study designed to test the goodness of fluorescent tracers in aeolian environments. Field experiments were performed in a nebkha field close to Famara beach at Lanzarote Island (Canary Islands, Spain) in a sector where the dunes were between 0.5 and 0.8 m height and 1–2 m wide and the vegetal cover was approximately 22%. In this dune field the sediment supply comes from Famara beach and is blown by trade winds toward the south, where the vegetation acts as natural sediment traps. Wind data were obtained by means of four Aanderaa wind speed sensors and one Aanderaa vane, all them distributed in a vertical array from 0.1 to 4 m height for 27 h. The average velocity at 1 m height during the experiment was 5.26 m s− 1 with the wind direction from the north. The tracer was under wind influence for 90 min at midday. During this period two series of sand traps (T1 and T2) N, S, E and W oriented were used. Resultant transport rates were 0.0131 and 0.0184 kg m− 1 min− 1 respectively. Tracer collection was performed with a sticky tape to sample only surface sediments. Tagged grains were visually counted under UV light. The transport rate was computed from the centroid displacement, that moved 0.875 m southwards, and the depth of the active layer considered was the size of one single grain. Taking into account these data the transport rate was 0.0072 kg m− 1 min− 1. The discrepancy in results between both methods is related to several factors, such as the thickness of the active layer and the grain size difference between the tagged and the native material.
URI: http://hdl.handle.net/10553/44200
ISSN: 0924-7963
DOI: 10.1016/j.jmarsys.2009.10.012
Source: Journal of Marine Systems [ISSN 0924-7963], v. 80 (3-4), p. 235-242
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