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An empirical-conceptual gully evolution model for channelled sea cliffs

An empirical-conceptual gully evolution model for channelled sea cliffs
An empirical-conceptual gully evolution model for channelled sea cliffs
Incised coastal channels are a specific form of incised channel that are found in locations where stream channels flowing to cliffed coasts have the excess energy required to cut down through the cliff to reach the outlet water body. The southern coast of the Isle of Wight, southern England, comprises soft cliffs that vary in height between 15 and 100 m and which are retreating at rates ? 1.5 m a? 1, due to a combination of wave erosion and landslides. In several locations, river channels have cut through the cliffs to create deeply (? 45 m) incised gullies, known locally as ‘Chines’. The Chines are unusual in that their formation is associated with dynamic shoreline encroachment during a period of rising sea-level, whereas existing models of incised channel evolution emphasise the significance of base level lowering. This paper develops a conceptual model of Chine evolution by applying space for time substitution methods using empirical data gathered from Chine channel surveys and remotely sensed data. The model identifies a sequence of evolutionary stages, which are classified based on a suite of morphometric indices and associated processes. The extent to which individual Chines are in a state of growth or decay is estimated by determining the relative rates of shoreline retreat and knickpoint recession, the former via analysis of historical aerial images and the latter through the use of a stream power erosion model.
gully, coastal, knickpoint, channel evolution, erosion modelling, chines
0169-555X
419-434
Leyland, Julian
6b1bb9b9-f3d5-4f40-8dd3-232139510e15
Darby, Stephen E.
4c3e1c76-d404-4ff3-86f8-84e42fbb7970
Leyland, Julian
6b1bb9b9-f3d5-4f40-8dd3-232139510e15
Darby, Stephen E.
4c3e1c76-d404-4ff3-86f8-84e42fbb7970

Leyland, Julian and Darby, Stephen E. (2008) An empirical-conceptual gully evolution model for channelled sea cliffs. Geomorphology, 102 (3-4), 419-434. (doi:10.1016/j.geomorph.2008.04.017).

Record type: Article

Abstract

Incised coastal channels are a specific form of incised channel that are found in locations where stream channels flowing to cliffed coasts have the excess energy required to cut down through the cliff to reach the outlet water body. The southern coast of the Isle of Wight, southern England, comprises soft cliffs that vary in height between 15 and 100 m and which are retreating at rates ? 1.5 m a? 1, due to a combination of wave erosion and landslides. In several locations, river channels have cut through the cliffs to create deeply (? 45 m) incised gullies, known locally as ‘Chines’. The Chines are unusual in that their formation is associated with dynamic shoreline encroachment during a period of rising sea-level, whereas existing models of incised channel evolution emphasise the significance of base level lowering. This paper develops a conceptual model of Chine evolution by applying space for time substitution methods using empirical data gathered from Chine channel surveys and remotely sensed data. The model identifies a sequence of evolutionary stages, which are classified based on a suite of morphometric indices and associated processes. The extent to which individual Chines are in a state of growth or decay is estimated by determining the relative rates of shoreline retreat and knickpoint recession, the former via analysis of historical aerial images and the latter through the use of a stream power erosion model.

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More information

Published date: 15 December 2008
Keywords: gully, coastal, knickpoint, channel evolution, erosion modelling, chines

Identifiers

Local EPrints ID: 64301
URI: https://eprints.soton.ac.uk/id/eprint/64301
ISSN: 0169-555X
PURE UUID: c8e62311-fb85-4540-897e-13cd41e641e3
ORCID for Julian Leyland: ORCID iD orcid.org/0000-0002-3419-9949
ORCID for Stephen E. Darby: ORCID iD orcid.org/0000-0001-8778-4394

Catalogue record

Date deposited: 23 Dec 2008
Last modified: 14 Mar 2019 01:49

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