Acthys Diffusion

Biviers, France

Acthys Diffusion

Biviers, France
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Boudou M.,IRSTEA | Lang M.,IRSTEA | Vinet F.,University of Montpellier 3 Paul Valery | Coeur D.,Acthys Diffusion
E3S Web of Conferences | Year: 2016

Evolution of flood mortality is complex as several opposite factors come into play. On one side, flood risk has been aggravated due to an increase of the number of inhabitants within the area at risk, and to an increasing of simple-storey houses without safe area. On the other side, flood risk is better managed due to a better efficiency of warning offices and civil protection actors. It is intended to demonstrate the potential of historical information on past flood events to give a better understanding of the main factors leading to mortality during flood events. This paper focuses on a set of six fatal floods from 1930 to 2010 in France, with a variable number of fatalities (from 25 to 423). Information was gathered on the main characteristics of past flood mortality: number of fatalities, death location, date and time of death, death circumstances, age and gender of victims. Based on the six flood events, the paper shows contrasted patterns on flood mortality in terms of spatial distribution, death location (inside/outside buildings), age of flood victims. The main factors leading to flood mortality are considered, such as population exposed to violent and sudden flooding, vulnerable built environment, inadequate behaviour of individuals and warning failures. © 2016 The Authors, published by EDP Sciences.


Lang M.,IRSTEA | Coeur D.,Acthys Diffusion | Audouard A.,University Grenoble Alpes | Audouard A.,French National Center for Scientific Research | And 3 more authors.
E3S Web of Conferences | Year: 2016

The paper describes the various features of the BDHI database (objects, functions, content). This document database provides document sheets on historical floods from various sources: technical reports from water authorities, scientific accounts (meteorology, hydrology, hydraulics...), post-disaster reports, newspapers or book extracts... It is complemented by fact sheets on flood events, which provide a summary text on significant past floods: location, date and duration, type of flood, extent, probability, adverse consequences A search engine is provided for information search based on time (specific date or period), on location (district, basin, city) or thematic topic (document type, flood type, flood magnitude, flood impact...). We conclude by some future challenges in relation to the next cycle of the Floods Directive (2016-2022), with the inventory of past floods which had significant adverse impacts. What are the flood events that need to be integrated (new ones later than 2011 and/or previous floods that had not yet been selected)? How can the process of historical data integration be extended at a local scale, with an adequate process of validation? How to promote the use of BDHI database in relation with the development of the culture of risk? © 2016 The Authors, published by EDP Sciences.


Neppel L.,Montpellier University | Renard B.,IRSTEA | Lang M.,IRSTEA | Ayral P.,Ecole des Mines d'Ales | And 6 more authors.
Hydrological Sciences Journal | Year: 2010

Flood frequency analysis based on a set of systematic data and a set of historical floods is applied to several Mediterranean catchments. After identification and collection of data on historical floods, several hydraulic models were constructed to account for geomorphological changes. Recent and historical rating curves were constructed and applied to reconstruct flood discharge series, together with their uncertainty. This uncertainty stems from two types of error: (a) random errors related to the water-level readings; and (b) systematic errors related to over- or under-estimation of the rating curve. A Bayesian frequency analysis is performed to take both sources of uncertainty into account. It is shown that the uncertainty affecting discharges should be carefully evaluated and taken into account in the flood frequency analysis, as it can increase the quantiles confidence interval. The quantiles are found to be consistent with those obtained with empirical methods, for two out of four of the catchments. © 2010 IAHS Press.


Lang M.,IRSTEA | Coeur D.,Acthys Diffusion | Bard A.,Acthys Diffusion | Bacq B.,Acthys Diffusion | And 7 more authors.
Houille Blanche | Year: 2013

An inventory of about 2000 French flood events has been achieved in 2011, in the framework of the Preliminary Flood Risk Assessment of the European Flood Directive. In collaboration with local authorities, a set of about 300 significant past floods has been documented with a short presentation (1 to 2 pages) of the hydro-meteorological conditions and the adverse consequences. The paper presents the methodological framework for data collection and significant flood selection. Then ten extreme flood events are presented: 1910, 1930, 1940, 1947-48, 1959, 1980, 1999, 2000-01, 2001 and 2010. Some perspectives are addressed to improve the knowledge of past floods. © 2013 Société Hydrotechnique de France.

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