Structural Monitoring and Maintenance

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Time-dependent reliability analysis of coastal defences subjected to changing environments

  • Received : 2015.01.25
  • Accepted : 2015.03.05
  • Published : 2015.03.25
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Abstract

This paper presents a method for assessing the risk of wave run-up and overtopping of existing coastal defences and for analysing the probability of failure of the structures under future hydraulic conditions. The recent UK climate projections are employed in the investigations of the influence of changing environments on the long-term performance of sea defences. In order to reduce the risk of wave run-up and overtopping caused by rising sea level and to maintain the present-day allowances for wave run-up height and overtopping discharge, the future necessary increase in crest level of existing structures is investigated. Various critical failure mechanisms are considered for reliability analysis, i.e., erosion of crest by wave overtopping, failure of seaside revetment, and internal erosions within earth sea dykes. The time-dependent reliability of sea dykes is analysed to give probability of failure with time. The results for an example earth dyke section show that the necessary increase in crest level is approximately double of sea level rise to maintain the current allowances. The probability of failure for various failure modes of the earth dyke has a significant increase with time under future hydraulic conditions.

Keywords

Acknowledgement

Supported by : Institution of Civil Engineers

References

  1. Allsop, W., Bruce, T., Pearson, J. and Besley, P. (2005), "Wave overtopping at vertical and steep seawalls", Proceedings of the Institution of Civil Engineers, Maritime Engineering, 158(3), 103-114. https://doi.org/10.1680/maen.2005.158.3.103
  2. Allsop, W., Kortenhaus, A. and Morris, M. (2007), Failure Mechanisms for Flood Defence Structures, HR Wallingford, Wallingford, Report T04-06-01.
  3. Buijs, F., Gouldby, B. and Sayers, P. (2006), Preliminary Reliability Analysis on the Thames Estuary, HR Wallingford, Wallingford, Report T07-06-07.
  4. Chen H.P. (2012), "Life-cycle performance assessment and cost-effective maintenance of sea defence structures due to changing environments", Proceedings of the 1st International Conference on Performance based and Life-cycle Structural Engineering (PLSE 2012), Hong Kong, China.
  5. Chen H.P. (2014), "Maintenance of earth sea dykes in changing environmental and structural conditions", Proceedings of the 4th International Symposium on Life-Cycle Civil Engineering (IALCCE 2014), Japan.
  6. Chen, H.P. and Alani, A.M. (2012a), "Reliability and optimised maintenance for sea defences", Proceedings of the ICE: Maritime Engineering, 165(2), 51-64. https://doi.org/10.1680/maen.2010.37
  7. Chen, H.P. and Alani, A.M. (2012b), "Optimised repair strategy for cracking concrete structures caused by reinforcement corrosion", ACI Struct. J., 110(2), 229-238.
  8. Chen, H.P. and Bicanic, N. (2010), "Identification of structural damage in buildings using iterative procedure and regularisation method", Eng. Comput., 27(8), 930-950. https://doi.org/10.1108/02644401011082962
  9. Chen, H.P. and Maung. T.S. (2014), "Regularised finite element model updating using measured incomplete modal data", J. Sound Vib., 333(21), 5566-5582. https://doi.org/10.1016/j.jsv.2014.05.051
  10. Chen, H.P. and Nepal, J. (2015), "Stochastic modelling and lifecycle performance assessment of bond strength of corroded reinforcement in concrete", Struct. Mech. Eng., 54(2), in press.
  11. Chen, H.P. and Xiao, N. (2015), "Symptom-based reliability analyses and performance assessment of corroded reinforced concrete structures", Struct.Mech. Eng., 53(6), 1183-1200. https://doi.org/10.12989/sem.2015.53.6.1183
  12. Construction Industry Research and Information Association (CIRIA) (2007), The Rock Manual. The use of rock in hydraulic engineering, (2nd Ed.), CIRIA, London, Report C683.
  13. Department of Communities and Local Government (DCLG) (2006), Planning Policy Statement 25: Development and Flood Risk, DCLG, London, The Stationary Office.
  14. Foster, M., Fell, R. and Spannagle, M. (2000), "A method for assessing the relative likelihood of failure of embankment dams by piping", Can. Geotech. J., 37, 1025-1061. https://doi.org/10.1139/t00-029
  15. Ghodoosi, F., Bagchi, A., Zayed, T. and Zaki, A.R. (2014), "Reliability-based condition assessment of a deteriorated concrete bridge", Struct. Monit. Maint., 1(4), 357-369. https://doi.org/10.12989/smm.2014.1.4.357
  16. Hall, J.W., Sayers, P.B., Walkden, M.J.A. and Panzeri, M. (2006), "Impacts of climate change on coastal flood risk in England and Wales: 2030-2100", Philos. T. R. Soc. A, 364, 1027-1049. https://doi.org/10.1098/rsta.2006.1752
  17. Hawkes, P., Surendran, S. and Richardson, D. (2003), "Use of UKCIP02 climate-change scenarios in flood and coastal defence", Water Environ. J., 17(4), 214-219. https://doi.org/10.1111/j.1747-6593.2003.tb00471.x
  18. Hussaarts, M., Vrijling, J.K., van Gelder, P., de Looff, H. and Blonk, C. (1999), "The probabilistic optimisation of the revetment on the dikes along the Frisian coast", (Ed. Losada I.J.), Proceedings of Coastal Structures.
  19. Jenkins, G.J., Murphy, J.M., Sexton, D.M.H., Lowe, J.A., Jones, P. and Kilsby, C.G. (2009), UK Climate Projections: Briefing report, Met Office Hadley Centre, Exeter, UK.
  20. Melchers, R.E. (1999), Structural Reliability: Analysis and Prediction, Chichester UK, John Wiley and Sons.
  21. Reis, M.T., Hedges, T.S., Williams, A. and Keating, K. (2006), "Specifying seawall crest levels using a probabilistic method", Proceedings of the Institution of Civil Engineers, Maritime Engineering, 159(4), 137-145. https://doi.org/10.1680/maen.2006.159.4.137
  22. Sutherland, J. and Gouldby, B. (2003), "Vulnerability of coastal defences to climate change", Proceedings of the Institution of Civil Engineers, Maritime Engineering, 156(2), 137-145.
  23. Tee, K.F., Khan, L.R. and Chen, H.P. (2013), "Probabilistic failure analysis of underground flexible pipes", Struct. Eng. Mech., 47(2), 167-183. https://doi.org/10.12989/sem.2013.47.2.167
  24. United Kingdom Climate Impacts Programme (UKCIP) (2002), Climate Change Scenarios for the United Kingdom: The UKCIP02 Scientific Report, University of East Anglia, Norwich, UK.
  25. Van der Meer, J.W. (1990), Reliability Analysis of Flood Defence Systems, Delft Hydraulics, Delft, Report H198.
  26. Van Gelder, P. (2008), Reliability Analysis of Flood Defence Systems, HR Wallingford, Wallingford, Report T07-09-20.
  27. Weijers, J.B.A. and Sellmeijer, J.B. (1992), "A new model to deal with the piping mechanism", Proceedings of the Filters in Geotechnical and Hydraulic Engineering, Proceedings of the 1st International Conference, Rotterdam, Holland.

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