Please use this identifier to cite or link to this item: http://hdl.handle.net/1893/7392
Appears in Collections:Biological and Environmental Sciences Journal Articles
Peer Review Status: Refereed
Title: Effect of forest edges on deposition of radioactive aerosols
Authors: Ould-Dada, Zitouni
Copplestone, David
Toal, Mark E
Shaw, Graeme
Contact Email: david.copplestone@stir.ac.uk
Keywords: radionuclides
radioactive aerosols
forest edge
deposition
wind tunnel
field study
Issue Date: Dec-2002
Publisher: Elsevier
Citation: Ould-Dada Z, Copplestone D, Toal ME & Shaw G (2002) Effect of forest edges on deposition of radioactive aerosols, Atmospheric Environment, 36 (36-37), pp. 5595-5606.
Abstract: The possible enhancement of aerosol deposition at forest edges was investigated in a wind tunnel and in the field. The wind tunnel study was carried out using 0.82 μm mass median aerodynamic diameter uranium particles and a composite canopy of rye grass and spruce saplings. The field study was undertaken at a coniferous woodland near to BNFL Sellafield, Cumbria, UK. Two transects were set through the woodland to determine the influence of the forest edge on atmospheric deposition of radionuclides released under authorisation from the Sellafield site. Results from the wind tunnel study showed that the deposition flux of uranium particles decreased with distance downwind from the grass–tree edge towards the interior of the canopy. The deposition flux at the edge was maximal at about 4×10−7 μg of U cm−2 s−1. This was 3 times higher than that observed over grass where a constant flux of about 1.32×10−7 μg of U cm−2 s−1 occurred. Results from the field study showed a clear influence of the forest edge on the atmospheric deposition of 241Am and 137Cs. Activity depositions of around 4750 and 230 Bqm−2 for 137Cs and 241Am, respectively, were measured in front of the woodland. Activity deposition inside the forest edge, however, rose to levels of between 20,200 and 50,900 Bq m−2 and 1100 and 3200 Bq m−2 for 137Cs and 241Am, respectively, depending upon the transect. Similar activity concentrations were measured in the pasture to the front and behind Lady Wood. Results from these studies corroborate those obtained from various studies on air pollutants including radionuclides. This underlines the importance of deposition at the edge of forests and its contribution to the overall canopy deposition. The edge effect is therefore an important factor that should be considered in the assessment of fallout impact, whether this is to be made by either direct
Type: Journal Article
URI: http://hdl.handle.net/1893/7392
DOI Link: http://dx.doi.org/10.1016/S1352-2310(02)00699-4
Rights: The publisher does not allow this work to be made publicly available in this Repository. Please use the Request a Copy feature at the foot of the Repository record to request a copy directly from the author. You can only request a copy if you wish to use this work for your own research or private study.
Affiliation: Food Standards Agency
Biological and Environmental Sciences
University of Liverpool
Imperial College London

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