A geomorphological approach to the strategic management of river bank erosion
A geomorphological approach to the strategic management of river bank erosion
The river channel evolution of the Afon Dyfi (N. Wales) is characterised by a complex system of lateral and vertical channel change where bank failure and subsequent collapse leads to land loss throughout the main river system.
Cartographic analysis of the Afon Dyfi has been undertaken from map based data spanning 100 years to determine the rates, locations and patterns of channel change. This information has been manipulated within a GIS by creating overlays of the digitised maps. These overlays highlight discrete areas of relative instability and stability within the river system. To determine why, when and how this instability/stability takes place, and to understand the processes and mechanisms that drives it, fieldwork was undertaken. This fieldwork involved a collection of field reconnaissance techniques enabling identification and measurement of factors influencing bank stability. The merging of the historical data and present conditions of the river system allows an understanding of the long-term stability of the system and its present stability. It enables areas to be determined which are both stable in the past and present; areas both unstable in the past and present; areas stable in the past but unstable at present; and areas unstable in the past and stable in the present.
A challenge to the analysis such as this includes the merging of historical and contemporary data over relatively large areas, coupled with the need to establish spatially contiguous relationships between dates and styles of channel activity. This thesis will explore how such problems can be addressed using GIS analysis and spatial statistics, in particular, Geographically Weighted Regression and thereafter how to inform non-specialists connected with the management of dynamic natural systems. Specifically, Management Units will be determined, based on the protocol developed in Shoreline Management Plans, with a mind to implementation by the Environment Agency.
University of Southampton
German, Sally Eloise
75c0f459-e37c-4229-98f3-07d30b3c1e76
2000
German, Sally Eloise
75c0f459-e37c-4229-98f3-07d30b3c1e76
German, Sally Eloise
(2000)
A geomorphological approach to the strategic management of river bank erosion.
University of Southampton, Doctoral Thesis.
Record type:
Thesis
(Doctoral)
Abstract
The river channel evolution of the Afon Dyfi (N. Wales) is characterised by a complex system of lateral and vertical channel change where bank failure and subsequent collapse leads to land loss throughout the main river system.
Cartographic analysis of the Afon Dyfi has been undertaken from map based data spanning 100 years to determine the rates, locations and patterns of channel change. This information has been manipulated within a GIS by creating overlays of the digitised maps. These overlays highlight discrete areas of relative instability and stability within the river system. To determine why, when and how this instability/stability takes place, and to understand the processes and mechanisms that drives it, fieldwork was undertaken. This fieldwork involved a collection of field reconnaissance techniques enabling identification and measurement of factors influencing bank stability. The merging of the historical data and present conditions of the river system allows an understanding of the long-term stability of the system and its present stability. It enables areas to be determined which are both stable in the past and present; areas both unstable in the past and present; areas stable in the past but unstable at present; and areas unstable in the past and stable in the present.
A challenge to the analysis such as this includes the merging of historical and contemporary data over relatively large areas, coupled with the need to establish spatially contiguous relationships between dates and styles of channel activity. This thesis will explore how such problems can be addressed using GIS analysis and spatial statistics, in particular, Geographically Weighted Regression and thereafter how to inform non-specialists connected with the management of dynamic natural systems. Specifically, Management Units will be determined, based on the protocol developed in Shoreline Management Plans, with a mind to implementation by the Environment Agency.
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Published date: 2000
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Local EPrints ID: 464243
URI: http://eprints.soton.ac.uk/id/eprint/464243
PURE UUID: 32ca71e0-9981-456c-9f7c-799a0afc39c7
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Date deposited: 04 Jul 2022 21:43
Last modified: 16 Mar 2024 19:21
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Author:
Sally Eloise German
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