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Improved condition characterisation of coastal defences

Lookup NU author(s): Professor Richard Dawson, Professor Jim Hall


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A condition characterisation provides information on the performance of a coastal defence. It is proposed that condition characterisation should be brought within a probabilistic framework so that it is directly compatible with risk-based planning, investment, operational and maintenance decision-making. This can be achieved by using a fragility function to describe the defence condition. However, fully probabilistic analysis of real defences is seldom practical because of the need for detailed measurements, which it may be uneconomical or indeed impossible to obtain. The information that is available may not be in a format that is directly applicable to probabilistic analysis. A new method has been developed that can use vague or partial information in probabilistic reliability analysis to generate imprecise assessments of the conditional probability of defence failure. Degradation of a defence is represented by declining values of relevant state variables, using information from defence inspections.

Publication metadata

Author(s): Dawson RJ, Hall JW

Editor(s): Allsop, NWH

Publication type: Conference Proceedings (inc. Abstract)

Publication status: Published

Conference Name: Breakwaters, Coastal Structures and Coastlines: Proceedings of the International Conference Organized by the Institution of Civil Engineers

Year of Conference: 2002

Pages: 123-134

ISSN: 9780727730428

Publisher: London: Thomas Telford