Reconstructing past flood events from geomorphological and historical data. The Giétro outburst flood in 1818

C. Lambiel, E. Reynard, P. Corboz, E. Bardou, C. Payot and B. Deslarzes

Journal of Maps, 2020, vol. 16, issue 2, 500-511

Abstract: The 16th of June 1818, the failure of the Giétro glacier in the Swiss Alps provoked an outburst flood that devastated the Bagnes valley, causing 34 deaths and major damages to buildings, road system, hydraulic infrastructures and crops. This disaster had a major impact on the economy of the valley and created a great movement of solidarity. It remains today a well-known historical natural disaster. In order to reconstruct the course of the wave and to map the flood, we used an interdisciplinary approach by crossing historical and geomorphological data. We first compiled and mapped the large number of historical data available in the local and state archives. These data were then completed by geomorphological observations made on the field and on numerical documents. The resulting map presents the spatial extent of the flood and water depths. This article shows the validity of interdisciplinary approaches for reconstructing past natural disasters.

Date: 2020
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DOI: 10.1080/17445647.2020.1763487

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