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Integration of multi-archive datasets towards the development of a four-dimensional paleoflood model in alpine catchments

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Both natural and documentary evidence of severe and catastrophic floods are of tremendous value for completing multidimensional flood calendars, as well as for mapping the most extreme riverine flooding phenomena in a river basin, over centennial and millennial time scales. Here, the integration of multi-archive flood series from the Hasli-Aare, Lütschine, Kander, Simme, Lombach, and Eistlenbach catchments in the Bernese Alps constitutes a unique approach to the reconstruction of flooding events over the last six centuries and to the development of a temporal-spatial model of past flood behavior. Different types of flood archive, be they of natural or anthropogenic origin, record different processes and legacies of these physical phenomena. In this study, paleoflood records obtained from floodplains (four flood series) and lake sediments (four series), together with documentary data (six series), were analyzed and compared with instrumental measurements (four series) and the profiles of lichenometric-dated flood heights (four series) to i) determine common flood pulses, ii) identify events that are out-of-phase, iii) investigate the sensitivity of the different natural archives to flood drivers and forcing, iv) locate past flooding in an alpine region of 2117 km2, and v) simulate atmospheric modes of climate variability during flood-rich periods from 1400 to 2005 CE. Asynchronous flood response across the sites is attributed to differences in their local hydrologic regimes, influenced by (i) their physiographic parameters, including size, altitude, storage capacity and connectivity of basins, and (ii) their climate parameters, including type, spatial distribution, duration, and intensity of precipitation.

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Global and Planetary Change, 2019, vol. 180, p. 66-88

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Articles publicats en revistes (Geografia)

# metadata.dc.title[].value
Integration of multi-archive datasets towards the development of a four-dimensional paleoflood model in alpine catchments