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Records of change in salt marshes: a radiochronological study of three Westerschelde (SW Netherlands) marshes

Records of change in salt marshes: a radiochronological study of three Westerschelde (SW Netherlands) marshes
Records of change in salt marshes: a radiochronological study of three Westerschelde (SW Netherlands) marshes
Three salt marshes on a 50-km transect along the north bank of the Westerschelde Estuary were investigated to determine whether salt marshes in the estuary had responded to shipping channel modifications in recent decades. Marsh accretion rates were estimated mainly from 137Cs profiles with further evidence from 241Am because changes in both rate of deposition and nature of the accreting material precluded use of standard 210Pbexcess dating models. The 137Cs profiles usually show peaks corresponding to atmospheric deposition from the 1963 fallout maximum and sometimes from the Chernobyl accident, although intervening enhanced 137Cs activities derived from the nuclear reprocessing marine discharges of Sellafield and La Hague are clearly discernible. In all three marshes (Ritthem at the mouth of the estuary and Zuidgors and Waarde at 20 and 45 km upstream), a marked, near-coincident change in the rate of accumulation and in the grain size of material deposited occurred around 1980. This may be related to a combination of channel deepening and straightening operations undertaken in the mid-1970s and/or natural changes in winter wave climate.
0013-936X
854-861
Dyer, F.M.
2721130a-874e-439f-b24b-96652e95ec10
Thomson, J.
3395054f-e507-4841-9758-a06ed37f7d6b
Croudace, I.W.
24deb068-d096-485e-8a23-a32b7a68afaf
Cox, R.
5e66a2a5-d3fe-40e5-9bfe-3b9841b9d324
Wadsworth, R.A.
de637e9b-1e7a-4dc2-afb6-9f8b52b05aff
Dyer, F.M.
2721130a-874e-439f-b24b-96652e95ec10
Thomson, J.
3395054f-e507-4841-9758-a06ed37f7d6b
Croudace, I.W.
24deb068-d096-485e-8a23-a32b7a68afaf
Cox, R.
5e66a2a5-d3fe-40e5-9bfe-3b9841b9d324
Wadsworth, R.A.
de637e9b-1e7a-4dc2-afb6-9f8b52b05aff

Dyer, F.M., Thomson, J., Croudace, I.W., Cox, R. and Wadsworth, R.A. (2002) Records of change in salt marshes: a radiochronological study of three Westerschelde (SW Netherlands) marshes. Environmental Science & Technology, 36 (5), 854-861. (doi:10.1021/es0110527).

Record type: Article

Abstract

Three salt marshes on a 50-km transect along the north bank of the Westerschelde Estuary were investigated to determine whether salt marshes in the estuary had responded to shipping channel modifications in recent decades. Marsh accretion rates were estimated mainly from 137Cs profiles with further evidence from 241Am because changes in both rate of deposition and nature of the accreting material precluded use of standard 210Pbexcess dating models. The 137Cs profiles usually show peaks corresponding to atmospheric deposition from the 1963 fallout maximum and sometimes from the Chernobyl accident, although intervening enhanced 137Cs activities derived from the nuclear reprocessing marine discharges of Sellafield and La Hague are clearly discernible. In all three marshes (Ritthem at the mouth of the estuary and Zuidgors and Waarde at 20 and 45 km upstream), a marked, near-coincident change in the rate of accumulation and in the grain size of material deposited occurred around 1980. This may be related to a combination of channel deepening and straightening operations undertaken in the mid-1970s and/or natural changes in winter wave climate.

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Published date: 1 March 2002

Identifiers

Local EPrints ID: 12627
URI: http://eprints.soton.ac.uk/id/eprint/12627
ISSN: 0013-936X
PURE UUID: 8ba0c1ec-de61-48ca-b803-f6648989e7e0

Catalogue record

Date deposited: 26 Nov 2004
Last modified: 06 Nov 2019 17:31

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