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Controls on creek margin stability by the root systems of saltmarsh vegetation, Beaulieu estuary, southern England

Controls on creek margin stability by the root systems of saltmarsh vegetation, Beaulieu estuary, southern England
Controls on creek margin stability by the root systems of saltmarsh vegetation, Beaulieu estuary, southern England
The retreat of cliffs (lateral expansion) within tidal creeks results in a net loss of saltmarshes, but this retreat process can be retarded by root systems. In order to understand the interaction between root presence and bank sediment, quantitative measurements of two saltmarsh species root systems (Atriplex portulacoides and Juncus maritima) were carried out in a saltmarsh in Southern England, and their relationships with bank stability were examined. Computed Tomography (CT) Scanning techniques were used to investigate three dimensional root architecture. The data obtained, e.g. root volume, diameter and distribution patterns of roots, were examined alongside more traditional root density measurements. The volumetric percentage, ratio between horizontal (lateral) and vertical roots (H/V ratio), and root diameter distribution are discussed in relation to their influence on bank sediment erosion threshold and shear strength. The results suggest that Atriplex portulacoides is more effective than Juncus maritimus, in stabilising banks. This is because root systems which provide a high resistance to flow-induced erosion are better than those which provide a high resistance to gravity-induced erosion in stabilising cliff banks. This conclusion is relevant to future saltmarsh protection and re-establishment.
2561-4150
21-38
Chen, Yining
9bd0c98e-117f-4e81-b9cf-49a621abb63c
Thompson, Charlotte
2a304aa6-761e-4d99-b227-cedb67129bfb
Collins, Michael
3b70278b-0004-45e0-b3c9-0debdf0a9351
Chen, Yining
9bd0c98e-117f-4e81-b9cf-49a621abb63c
Thompson, Charlotte
2a304aa6-761e-4d99-b227-cedb67129bfb
Collins, Michael
3b70278b-0004-45e0-b3c9-0debdf0a9351

Chen, Yining, Thompson, Charlotte and Collins, Michael (2019) Controls on creek margin stability by the root systems of saltmarsh vegetation, Beaulieu estuary, southern England. Anthropocene Coasts, 2 (1), 21-38. (doi:10.1139/anc-2018-0005).

Record type: Article

Abstract

The retreat of cliffs (lateral expansion) within tidal creeks results in a net loss of saltmarshes, but this retreat process can be retarded by root systems. In order to understand the interaction between root presence and bank sediment, quantitative measurements of two saltmarsh species root systems (Atriplex portulacoides and Juncus maritima) were carried out in a saltmarsh in Southern England, and their relationships with bank stability were examined. Computed Tomography (CT) Scanning techniques were used to investigate three dimensional root architecture. The data obtained, e.g. root volume, diameter and distribution patterns of roots, were examined alongside more traditional root density measurements. The volumetric percentage, ratio between horizontal (lateral) and vertical roots (H/V ratio), and root diameter distribution are discussed in relation to their influence on bank sediment erosion threshold and shear strength. The results suggest that Atriplex portulacoides is more effective than Juncus maritimus, in stabilising banks. This is because root systems which provide a high resistance to flow-induced erosion are better than those which provide a high resistance to gravity-induced erosion in stabilising cliff banks. This conclusion is relevant to future saltmarsh protection and re-establishment.

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ChenThompsonCollins_Anthropocene Coasts - Accepted Manuscript
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Accepted/In Press date: 12 December 2018
e-pub ahead of print date: 10 May 2019

Identifiers

Local EPrints ID: 426845
URI: http://eprints.soton.ac.uk/id/eprint/426845
ISSN: 2561-4150
PURE UUID: 6cb1a196-7527-4ee5-874a-935da749c6fb
ORCID for Charlotte Thompson: ORCID iD orcid.org/0000-0003-1105-6838

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Date deposited: 13 Dec 2018 17:30
Last modified: 28 Apr 2022 06:05

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Author: Yining Chen
Author: Michael Collins

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