The study of mechanisms that allow the formation of structures such as sand dunes and ripples at the bottom of a fluid flow plays a crucial role in the understanding of coastal dynamics. The modeling of these phenomena is particularly complex since we must not only solve the Navier-Stokes or Saint-Venant equations with equation for sediment transport, but also take into account the evolution of...

Although field observations of sudden spillway releases highlighted strong aeration of dam break wave flows, no study investigated these two-phase flow characteristics. New original experiments were conducted down a 24 m long stepped waterways. Dam break wave propagation showed an equivalent flow resistance similar to steady flow conditions (f ~ 0.05). Detailed unsteady air-water flow measureme...

The Saint-Lazare Hospital and its annexes are situated near the Gare de l'Est, more or less on the site of the old prison of Saint-Lazare which used to occupy number 107, Faubourg Saint-Denis. The buildings stretch from Faubourg Saint-Denis as far as La Cour de la Ferme Saint-Lazare. The front entrance is at 9, Cour de la Ferme Saint-Lazare. It is a magnificent modem building, built and planned...

Landscape genetics is being increasingly applied to elucidate the role of environmental features on the population structure of terrestrial organisms. However, the potential of this framework has been little explored in aquatic ecosystems such as large rivers. Here, we used a landscape genetics approach in order to (i) document the population structure of the yellow perch (Perca flavescens) by ...

Abstract: This paper proposes a sediment-transport model based on coupled Saint-Venant and Exner equations. A finite volume method of Godunov type with predictor-corrector steps is used to solve a set of coupled equations. An efficient combination of approximate Riemann solvers is proposed to compute fluxes associated with sediment-laden flow. In addition, a new method is proposed for computing...

Alexander Fradkov*. Olga Tomchina** Viktoria Galitskaya***. Dmitry Gorlatov****  * Institute of Problems of Mechanical Engineering, Russian Academy of Sciences, Saint Petersburg, Russia (Tel: 812-321-4410; e-mail: [email protected]) ** Saint Petersburg State Polytechnical University, Saint Petersburg, Russia (e-mail: [email protected]) *** Saint Petersburg State Polytechnical University, Saint P...

A one-dimensional model framework of unsteady free-surface flow through a blocking-drag region is developed, tested, and applied to understand the dam-break past rectangular building. This achieved by studying steady-state, adjustment response region. Three steady regimes are identified based on Froude number upstream downstream region: subcritical state, choked state with subcritical-supercrit...