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| Titel |
A geotechnical and GIS based method for evaluating risk exposition along coastal cliff environments: a case study of the chalk cliffs of southern England |
| VerfasserIn |
A. Stavrou, J. A. Lawrence, R. N. Mortimore, W. Murphy |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1561-8633
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| Digitales Dokument |
URL |
| Erschienen |
In: Natural Hazards and Earth System Science ; 11, no. 11 ; Nr. 11, no. 11 (2011-11-09), S.2997-3011 |
| Datensatznummer |
250009782
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| Publikation (Nr.) |
 copernicus.org/nhess-11-2997-2011.pdf |
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| Zusammenfassung |
| The present work has established a methodology that allows the
user to determine areas susceptible to shoreline recession and cliff
instability. This methodology includes the development of a qualitative loss
estimation system which utilizes geotechnical field mapping observations and
shoreline retreat predictions to estimate the exposition of critical
infrastructure to hazards posed by cliff collapse and retreat. The technique
identifies hazardous areas along coastal cliff environments. The assessment
was undertaken along the cliff section between Brighton Marina and
Portobello, East Sussex, UK. The cliff line was divided into 22 sections
according to the cliff's geology. Each of these sections was mapped and
described with respect to the lithology and possible failures that could
occur. Historical shoreline recession analysis was used for the prediction
of future shoreline positions. The prediction of future shorelines was
performed by using the Digital Shoreline Analysis System, extension of
ESRI's ArcView 9.x. The analysis was based on historical maps and aerial
photographs dating from 1873 to 2005. The long term average cliff recession
rates clearly show that cliff retreat has declined through time due to the
presence of coast protection and cliff stability measures. Although these
measures have delayed cliff recession to a great extent, they have not
eliminated it. |
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