Physicochemical changes in sediments at Orplands Farm,Essex, UK following 8 years of managed realignment |
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| Authors: | KL Spencer AB Cundy S Davies-Hearn R Hughes S Turner CL MacLeod |
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| Institution: | 1. Department of Geography, Queen Mary, University of London, Mile End Road, London E1 4NS, UK;2. School of the Environment, University of Brighton, Brighton BN2 4GJ, UK;3. RPS Health, Safety and Environment, Opus House, Manor Court, Herriard, Basingstoke, Hampshire RG25 2PH, UK;4. School of Biological and Chemical Sciences, Queen Mary, University of London, Mile End Road, London E1 4NS, UK;5. ECRC, Department of Geography, University College London, Gower Street, London WC1E 6BT, UK;6. Arcadis Geraghty & Miller International Ltd., 2 Craven Court, Willie Snaith Road, Newmarket, Suffolk CB8 7FA, UK |
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| Abstract: | Managed realignment (MR) is a ‘soft’ engineering technique that involves the deliberate landwards retreat of the existing line of coastal defence and subsequent tidal inundation of land. Managed realignment has been established worldwide for over 30 years and its goals may include habitat restoration, recovery of biodiversity and sustainable coastal defence. In southeast England in particular, an increasing number of MR sites (20–110 ha) have been commissioned in the last decade in response to increasing coastal habitat loss and sea-level rise. Following initial sea wall breaching and site flooding, monitoring of these sites is usually carried out for a period of 5 years and during this time changes in ecosystem structure can be easily observed. However, there is a poor understanding of the long-term effects of flooding on soil physicochemical parameters including sediment geochemistry and geochemical cycling, nutrient fluxes and soil maturation processes. Such physical and chemical changes may continue to take place over time-scales exceeding 5 years and therefore current monitoring practices may not be sufficient. |
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| Keywords: | managed realignment ecosystem management sediment chemistry saltmarshes UK Essex Blackwater Estuary Orplands Farm |
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