Sources and timing of anthropogenic pollution in the Ensenada de San Simón (inner Ría de Vigo), Galicia, NW Spain: an application of mixture-modelling and nonlinear optimization to recent sedimentation

Howarth, R.J., Evans, G., Croudace, I.W. and Cundy, A.B. (2005) Sources and timing of anthropogenic pollution in the Ensenada de San Simón (inner Ría de Vigo), Galicia, NW Spain: an application of mixture-modelling and nonlinear optimization to recent sedimentation Science of the Total Environment, 340 (1-3). pp. 149-176.

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Abstract

The Ensenada de San Simón is the inner part of the Ría de Vigo, one of the major mesotidal rías of the Galician coast, NW Spain. The geochemistry of its bottom sediments can be accounted for in terms of both natural and anthropogenic sources. Mixture-modelling enables much of the Cr, Ni, V, Cu, Pb and Zn concentrations of the bottom and subaqueous sediments to be explained by sediment input from the river systems and faecal matter from manmade mussel rafts. The compositions and relative contributions of additional, unknown, sources of anomalous heavy-metal concentrations are quantified using constrained nonlinear optimization. The pattern of metal enrichment is attributed to: material carried in solution and suspension in marine water entering the Ensenada from the polluted industrial areas of the adjacent Ría de Vigo; wind-borne urban dusts and/or vehicular emissions from the surrounding network of roads and a motorway road-bridge over the Estrecho de Rande; industrial and agricultural pollution from the R. Redondela; and waste from a former ceramics factory near the mouth of the combined R. Oitabén and R. Verdugo. Using 137Cs dating, it is suggested that heavy metal build-up in the sediments since the late 1970s followed development of inshore fisheries and introduction of the mussel rafts (ca. 1960) and increasing industrialisation.

Item Type: Journal article
Uncontrolled Keywords: Subaqueous sediments; Ensenada de San Simón; Ría de Vigo; NW Spain; Cr; Cu; Ni; Pb; V; Zn; Anthropogenic pollution; Mussel rafts; Urban dusts; Highway dusts; Mixture-modelling; Nonlinear optimization; 137Cs dating
Subjects: F000 Physical Sciences > F600 Geology
DOI (a stable link to the resource): 10.1016/j.scitotenv.2004.08.001
Faculties: Faculty of Science and Engineering > School of Environment and Technology > Applied Geosciences
Faculty of Science and Engineering > School of Environment and Technology > Ecology, Landscape and Pollution Management
Faculty of Science and Engineering > School of Environment and Technology
Depositing User: editor environment
Date Deposited: 06 Oct 2006
Last Modified: 31 Jan 2014 13:51
URI: http://eprints.brighton.ac.uk/id/eprint/157

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