Print Email Facebook Twitter Value of information in retrofitting of flood defenses Title Value of information in retrofitting of flood defenses Author Schweckendiek, T. Vrouwenvelder, A.C.W.M. Faculty Civil Engineering and Geosciences Department Hydraulic Engineering Date 2015-07-12 Abstract Dikes and levees play a crucial role in flood protection. The main causes of levee failures are of geotechnical nature; geotechnical failure modes are also the main contributors to the probability of failure of flood defences due to the typically large uncertainties in ground conditions. Hence, information on ground conditions and soil properties is crucial in safety assessments and retrofitting designs of levees. The present paper demonstrates how we can reduce these uncertainties and how we can provide input for rational decision making on investments in monitoring and site investigation. If working in a framework with an explicit target reliability, the value of such information can be expressed in terms of the savings that can be achieved in retrofitting costs. The key ingredients of the approach are Bayesian posterior analysis for reliability updating by incorporating the information from various sources and Bayesian (pre-posterior) decision analysis for estimating the uncertainty and expected values of the consequences and costs of the considered decision options. The optimal strategy is the one with the least expected cost to meet the pre-set reliability target (e.g. by a safety standard). Several examples and case studies addressing different sources of information, such as field observations and piezometer monitoring during floods or site investigation by Cone Penetration Tests (CPT), illustrate the impact of reliability updating and suggest that investments in inspection and monitoring are often worthwhile, especially when the prior uncertainties are large. To reference this document use: http://resolver.tudelft.nl/uuid:8370d274-78a1-4171-95a3-4fe7ccba4ebf Embargo date 2015-07-12 Source ICASP12: 12th International Conference on Applications of Statistics and Probability in Civil Engineering, Vancouver, Canada, 12-15 July 2015 Part of collection Institutional Repository Document type conference paper Rights (c) 2015 The Author(s) Files PDF 317307.pdf 407.33 KB Close viewer /islandora/object/uuid%3A8370d274-78a1-4171-95a3-4fe7ccba4ebf/datastream/OBJ/view