Floods and climate_ Emerging perspectives for flood risk assessment and management

Merz, B. and Aerts, J. and Arnbjerg-Nielsen, K. and Baldi, M. and Becker, A. and Bichet, A. and Bl"oschl, G. and Bouwer, L. M. and Brauer, A. and Cioffi, F. and Delgado, J. M. and Gocht, M. and Guzzetti, F. and Harrigan, S. and Hirschboeck, K. and Kilsby, C. and Kron, W. and Kwon, H.-H. and Lall, U. and Merz, R. and Nissen, K. and Salvatti, P. and Swierczynski, T. and Ulbrich, U. and Viglione, A. and Ward, P. J. and Weiler, M. and Wilhelm, B. and Nied, M., 2014, Floods and climate_ Emerging perspectives for flood risk assessment and management, Natural hazards and earth system sciences (Print) 14 (2014): 1921–1942. doi_10.5194/nhess-14-1921-2014,
URL: http://www.cnr.it/prodotto/i/295571

Flood estimation and flood management have traditionally been the domain of hydrologists, water resources engineers and statisticians, and disciplinary approaches abound. Dominant views have been shaped; one example is the catchment perspective_ floods are formed and influenced by the interaction of local, catchment-specific characteristics, such as meteorology, topography and geology. These traditional views have been beneficial, but they have a narrow framing. In this paper we contrast traditional views with broader perspectives that are emerging from an improved understanding of the climatic context of floods. We come to the following conclusions_ (1) extending the traditional system boundaries (local catchment, recent decades, hydrological/hydraulic processes) opens up exciting possibilities for better understanding and improved tools for flood risk assessment and management. (2) Statistical approaches in flood estimation need to be complemented by the search for the causal mechanisms and dominant processes in the atmosphere, catchment and river system that leave their fingerprints on flood characteristics. (3) Natural climate variability leads to time-varying flood characteristics, and this variation may be partially quantifiable and predictable, with the perspective of dynamic, climate-informed flood risk management. (4) Efforts are needed to fully account for factors that contribute to changes in all three risk components (hazard, exposure, vulnerability) and to better understand the interactions between society and floods. (5) Given the global scale and societal importance, we call for the organization of an international multidisciplinary collaboration and data-sharing initiative to further understand the links between climate and flooding and to advance flood research. © Author(s) 2014.

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