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Saltmarsh creek bank stability: Biostabilisation and consolidation with depth

Saltmarsh creek bank stability: Biostabilisation and consolidation with depth
Saltmarsh creek bank stability: Biostabilisation and consolidation with depth
The stability of cohesive sediments of a saltmarsh in Southern England was measured in the field and the laboratory using a Cohesive Strength Meter (CSM) and a shear vane apparatus. Cores and sediment samples were collected from two tidal creek banks, covered by Atriplex portulacoides (Sea Purslane) and Juncus maritimus (Sea Rush), respectively. The objectives of the study were to examine the variation of sediment stability throughout banks with cantilevers present and investigate the influence of roots and downcore consolidation on bank stability. Data on erosion threshold and shear strength were interpreted with reference to bank depth, sediment properties and biological influences. The higher average erosion threshold was from the Sea Purslane bank whilst the Sea Rush bank showed higher average vane shear strength. The vertical variation in core sediment stability was mainly affected by roots and downcore consolidation with depth. The data obtained from the bank faces revealed that vertical variations in both erosion threshold and vane shear strength were affected primarily by roots and algae. A quantitative estimate of the relative contributions of roots and downcore consolidation to bank sediment stability was undertaken using the bank stability data and sediment density data. This showed that roots contributed more to the Sea Purslane bank stability than downcore consolidation, whilst downcore consolidation has more pronounced effects on the Sea Rush bank stability.
Erosion threshold, Shear strength, Roots, Consolidation, CSM
0278-4343
64-74
Chen, Y.
aa3aa967-2aa4-499c-9265-8e6a7e7fb9e5
Thompson, C.E.L.
2a304aa6-761e-4d99-b227-cedb67129bfb
Collins, M.B.
3b70278b-0004-45e0-b3c9-0debdf0a9351
Chen, Y.
aa3aa967-2aa4-499c-9265-8e6a7e7fb9e5
Thompson, C.E.L.
2a304aa6-761e-4d99-b227-cedb67129bfb
Collins, M.B.
3b70278b-0004-45e0-b3c9-0debdf0a9351

Chen, Y., Thompson, C.E.L. and Collins, M.B. (2012) Saltmarsh creek bank stability: Biostabilisation and consolidation with depth. Continental Shelf Research, 35, 64-74. (doi:10.1016/j.csr.2011.12.009).

Record type: Article

Abstract

The stability of cohesive sediments of a saltmarsh in Southern England was measured in the field and the laboratory using a Cohesive Strength Meter (CSM) and a shear vane apparatus. Cores and sediment samples were collected from two tidal creek banks, covered by Atriplex portulacoides (Sea Purslane) and Juncus maritimus (Sea Rush), respectively. The objectives of the study were to examine the variation of sediment stability throughout banks with cantilevers present and investigate the influence of roots and downcore consolidation on bank stability. Data on erosion threshold and shear strength were interpreted with reference to bank depth, sediment properties and biological influences. The higher average erosion threshold was from the Sea Purslane bank whilst the Sea Rush bank showed higher average vane shear strength. The vertical variation in core sediment stability was mainly affected by roots and downcore consolidation with depth. The data obtained from the bank faces revealed that vertical variations in both erosion threshold and vane shear strength were affected primarily by roots and algae. A quantitative estimate of the relative contributions of roots and downcore consolidation to bank sediment stability was undertaken using the bank stability data and sediment density data. This showed that roots contributed more to the Sea Purslane bank stability than downcore consolidation, whilst downcore consolidation has more pronounced effects on the Sea Rush bank stability.

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More information

Published date: 1 March 2012
Keywords: Erosion threshold, Shear strength, Roots, Consolidation, CSM
Organisations: Coastal & Shelf Research

Identifiers

Local EPrints ID: 335892
URI: https://eprints.soton.ac.uk/id/eprint/335892
ISSN: 0278-4343
PURE UUID: a635d6b8-c9f9-40f6-960e-e39507f64801

Catalogue record

Date deposited: 13 Mar 2012 16:56
Last modified: 18 Jul 2017 06:10

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