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Sedimentary response of Pagham Harbour, southern England to barrier breaching in AD 1910

Sedimentary response of Pagham Harbour, southern England to barrier breaching in AD 1910
Sedimentary response of Pagham Harbour, southern England to barrier breaching in AD 1910
This paper examines the evolution of Pagham Harbour, southern England following storm-induced breaching of a protective barrier in AD 1910. Stratigraphic studies of sediments collected from intertidal areas show the presence of a distinct stratigraphic horizon in the northeast of Pagham Harbour at ca. 0 to +1.0 m ordnance datum (OD). Radiometric data indicate that this horizon is a ‘reclamation surface’ formed after land claim in AD 1846. Following marine flooding in AD 1910, sediment has accreted relatively rapidly (at a broadly constant rate of between 4 and 8 mm a?1), wave and/or tidal energy have decreased and extensive marshes have developed. An asymptotic reduction in sediment accretion rate through time, as predicted in various theoretical models of salt marsh accretion, is not observed. Over the entire Pagham Harbour area, the period between AD 1948 and AD 1986 has seen an average marsh loss of 0.0087 km2 a?1, which is relatively small in comparison with other more exposed sites in the local area. Historically breached sites such as Pagham Harbour are common around European coasts, and these provide important natural laboratories within which the medium-term (decadal to centennial) coastal response to barrier breaching, and to managed-realignment coastal protection schemes, can be assessed.
Sea-level rise, 210Pb and 137Cs dating, Diatoms, Barrier breaching, Salt marshes, Coastal management
0169-555X
163-176
Cundy, A.B.
994fdc96-2dce-40f4-b74b-dc638286eb08
Long, A.J.
75e4be96-0621-47a1-98b3-46cfd97e2ca2
Hill, C.T.
4e849779-d912-4398-900c-34e1a55ef5af
Spencer, C.
bbc2c729-8b43-435a-a8d8-8585fa0e388a
Croudace, I.W.
24deb068-d096-485e-8a23-a32b7a68afaf
Cundy, A.B.
994fdc96-2dce-40f4-b74b-dc638286eb08
Long, A.J.
75e4be96-0621-47a1-98b3-46cfd97e2ca2
Hill, C.T.
4e849779-d912-4398-900c-34e1a55ef5af
Spencer, C.
bbc2c729-8b43-435a-a8d8-8585fa0e388a
Croudace, I.W.
24deb068-d096-485e-8a23-a32b7a68afaf

Cundy, A.B., Long, A.J., Hill, C.T., Spencer, C. and Croudace, I.W. (2002) Sedimentary response of Pagham Harbour, southern England to barrier breaching in AD 1910. Geomorphology, 46, 163-176. (doi:10.1016/S0169-555X(02)00060-0).

Record type: Article

Abstract

This paper examines the evolution of Pagham Harbour, southern England following storm-induced breaching of a protective barrier in AD 1910. Stratigraphic studies of sediments collected from intertidal areas show the presence of a distinct stratigraphic horizon in the northeast of Pagham Harbour at ca. 0 to +1.0 m ordnance datum (OD). Radiometric data indicate that this horizon is a ‘reclamation surface’ formed after land claim in AD 1846. Following marine flooding in AD 1910, sediment has accreted relatively rapidly (at a broadly constant rate of between 4 and 8 mm a?1), wave and/or tidal energy have decreased and extensive marshes have developed. An asymptotic reduction in sediment accretion rate through time, as predicted in various theoretical models of salt marsh accretion, is not observed. Over the entire Pagham Harbour area, the period between AD 1948 and AD 1986 has seen an average marsh loss of 0.0087 km2 a?1, which is relatively small in comparison with other more exposed sites in the local area. Historically breached sites such as Pagham Harbour are common around European coasts, and these provide important natural laboratories within which the medium-term (decadal to centennial) coastal response to barrier breaching, and to managed-realignment coastal protection schemes, can be assessed.

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More information

Published date: 2002
Keywords: Sea-level rise, 210Pb and 137Cs dating, Diatoms, Barrier breaching, Salt marshes, Coastal management

Identifiers

Local EPrints ID: 12624
URI: https://eprints.soton.ac.uk/id/eprint/12624
ISSN: 0169-555X
PURE UUID: 28f45781-fafc-4c25-9bdf-64d969607100
ORCID for A.B. Cundy: ORCID iD orcid.org/0000-0003-4368-2569

Catalogue record

Date deposited: 26 Nov 2004
Last modified: 17 Jul 2017 17:02

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Contributors

Author: A.B. Cundy ORCID iD
Author: A.J. Long
Author: C.T. Hill
Author: C. Spencer
Author: I.W. Croudace

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