DELAHAYE , Daniel

The aim of this article is to review the current knowledge on flash floods occurring at the end of the spring or during the summer on the loamy plateaus of the Parisian Basin, in northwestern France. Classically named 'muddy floods', such hydrological hazards are signif- icant as they cause losses of life and significant damage on buildings and...

Les indices morphométriques ont été les toutes premières mesures créées en géomorphologie pour comparer les caractéristiques morphologiques des bassins versants et pour quantifier leur comportement hydrologique potentiel. Alors que toutes ces méthodes se retrouvent aujourd'hui en préambule de nombreux ouvrages d'hydrologie, plusieurs auteurs en...

This paper proposes a method to synchronize traffic flow optimization and sector opening scheduling, with the aim of achieving flexible demand and capacity balancing (DCB). Delay assignment, trajectory options and sector collapsing are used to manage the traffic demand, while sector opening schemes are to affect the airspace capacity. Mixed...

This article aims to better assess the risk due to flash floods occurring at the end of the spring or during summer in the north of the Parisian Basin. Most of the hydrological studies focused in this area on classical floods as overflowing and water table rising but not on floods rarely occurring in dry valleys. Based on sensitive and relevant...

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This paper presents an application of a cellular automaton-based runoff model (RUICELLS) to a series of small dry valleys in the Seine-Maritime department, northern France, to better assess their susceptibility to flash flood. These muddy floods shortly follow high rainfall (50–100 mm in less than 6 h) and occur in very small areas (\20 km 2)....

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Ce travail propose de simuler l'apparition probable des crues rapides aux exutoires de nombreux bassins versants (148), de petite taille (<20 km2) en intégrant des données environnementales à échelle fine dans l'automate RUICELLS. Le mode de fonctionnement de ces crues est bien connu et pourtant, anticiper leur survenue demeure illusoire. Afin...

This paper presents a methodology to tackle the problem of strategic aircraft conflict detection and resolution, up to 60 minutes in advance, considering wind and temperature uncertainties. The problem of hundreds of en-route aircraft flying multi-segmented 2D trajectories is considered. The weather uncertainty is retrieved from Ensemble...

This paper focuses on the spatial coexistence between different hazards (strong west winds, beach sedimentary crisis and flash floods) in outlets of small catchments in a sedimentary basin. This study was carried out in the department of Upper Normandy located in north-western France. To anticipate possible future hazards and damages without...

This paper focuses on the spatial coexistence between different hazards (strong west winds, beach sedimentary crisis and flash floods) in outlets of small catchments in a sedimentary basin. This study was carried out in the department of Upper Normandy located in north-western France. To anticipate possible future hazards and damages without...

Hydrosedimentary fluxes that run from agricultural plots down to the water streams are currently associated with many social, economic and environmental issues such as diffuse pollution, soil infertility, soil loss, floods, etc. While the genesis of these transfers are well-known at the scale of the agricultural plot, flow dynamics occurring on...

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