Arizona ; Experimental catchment ; Model ; Overland flow ; Plant canopy ; Sediment budget ; Sediment transport ; Slope gradient ; Splash ; United States of America ; Water erosion ; Watershed
Arizona ; Balance sedimentario ; Cubierta vegetal ; Cuenca experimental ; Cuenca hidrográfica ; Erosión hídrica ; Escorrentíasuperficial ; Estados Unidos ; Inclinación de la vertiente ; Modelo ; Splash ; Transporte sedimentario
The AA. propose a framework that integrates a geomorphic component into the physically-based and spatially distributed TIN-based Real-time Integrated Basin Simulator (tRIBS) model. The coupled model simulates main erosive processes of hillslopes
Gulch Experimental Watershed (Arizona, USA). It is demonstrated to be capable of reproducing main runoff and sediment yield events and accumulated volumes over the long term.
Discussion of some data obtained by GERETY and SLINGERLAND (1983) which is based on the hypothesis that classification of samples of aerosols above eroding surfaces should be based on terminal velocities rather than on measures of size
Bed scouring downstream of hydraulic structures under steady flow conditions : experimental analysis of space and time scales and implications for mathematical modeling
Experimentation ; Hydraulic works ; Impact ; Mathematical model ; River bed ; Scouring ; Sediment transport ; Simulation ; Stream
In this work, attention is paid to scouring process occurring downstream of the rigid basement of a hydraulic structure. The analysis is focused on transient bed profiles which are determined, under steady flow conditions, by a decrease
of the upstream sediment transport rate. For this purpose, movable-bed runs are carried out in a straight laboratory channel, for two values of the water discharge. During each run, the longitudinal bed profiles are measured at different times. Based
on experimental data, spatial scale factors of the bed scouring and of the bed load transport to reach the equilibrium conditions are defined. Particularly, it is found that the scour length varies especially during the first evolution phase and then it oscillates
Aeolian features ; Biogeography ; Duricrust ; Experimentation ; Micro-organism ; Sediment transport ; Wind erosion
This paper reports on a laboratory wind tunnel based comparison of the stability of mono-specific crusts formed by each of 3 selected photoautotrophs: Chlamydomonas acidophila, Lyngbya sp., and Nostoc commune. Only filamentous cyanobacteria
Coastal dynamics ; Coastal environment ; Experimentation ; Japan ; Model ; Sand bar ; Vortex
the vortices and bar formation in detail. Four process models on bar formation are constructed based on the action of vortices: they are models for break-point single bar, inshore single bar, successive multiple bars, and simultaneous multiple bars
This paper investigates the controls of the correction factors α and β and develop predictive models for these factors. The investigation is based on a set of 40 experiments conducted in a laboratory flume with a mobile sand bed. Simulated rainfall
behaviour. The results identify in mudrocks a transitional phase of behaviour in which creep-like movement will manifest itself at the base of a deep-seated landslide as the growth of microcracks. The microcracks may eventually coalesce to form a shear
Aeolian features ; Aeolian transport ; Concept ; Experimentation ; Grain size distribution ; Methodology ; Roughness ; Wind erosion
This paper deals with the temporal variation in the grain size of surface material using an analytical method based on the effective surface concept. This method is applied to data collected in 2 series of wind tunnel experiments. The results
Cours d'eau ; Débris de bois ; Erosion des berges ; Etats-Unis ; Expérimentation ; Géométrie hydraulique ; Lit fluvial ; Mississippi ; Modèle ; Sable
Bank erosion ; Channel geometry ; Experimentation ; Mississippi ; Model ; River bed ; Sand ; Stream ; United States of America
This paper presents the results of a movable-boundary, distorted, Froude-scaled hydraulic model based on Abiaca Creek, a sand-bedded channel in northern Mississippi. The model was used to examine the geomorphic and hydraulic impact of simplified
Based on experiments in 2 flumes with fixed and mobile plane beds and previously published data, an equation is developed that may be used to predict bedload transport resistance for both capacity and non-capacity flows. The variables
Ecoulement ; Erosion des sols ; Expérimentation ; Sel ; Simulation de pluie ; Sénégal ; Technique de recherche ; Traceur ; Vitesse d'écoulement
Experimentation ; Rainfall simulation ; Research technique ; Runoff ; Salt ; Senegal ; Soil erosion ; Tracer
; a laboratory-based flume experiment. This article demonstrates that a fixed value of the correction factor α is inappropriate, since the correction factor varies with velocity, diffusion and the length of the control section.
Albédo ; British Columbia ; Canada ; Expérimentation ; Lithologie ; Météorisation ; Radiation ; Température ; Température de la roche
Albedo ; British Columbia ; Canada ; Experimentation ; Lithology ; Radiation ; Temperature ; Weathering
, for 5 months, for the rock surface and the base of the rock, the blocks being set within a mass of local sediment. The results of the controlled experiment are presented and discussed.
Expérimentation en laboratoire à la base d'une falaise par les vagues chargées de débris. Cette étude révèle un effet doublé des abrasifs lorsque la limite entre la falaise et la plage est située au-dessus du niveau de l'eau au repos. La force
Décrire à grande échelle l’occupation des sols urbains par photo-interprétation. Réflexion méthodologique et expérimentation en Provence
Base de données ; Cadastre ; Espace urbain ; France ; Marseille ; Occupation du sol ; Parcellaire ; Photo-interprétation ; Provence-Alpes-Côte d'Azur ; Zonage ; Zone périurbaine
Cadastral survey ; Data base ; France ; Land utilisation ; Marseille ; Outer conurbation area ; Photointerpretation ; Plots of land ; Provence-Alpes-Côte d'Azur ; Urban area ; Zoning
Base de datos ; Catastro ; Espacio urbano ; Fotointerpretación ; Francia ; Ocupación del suelo ; Parcelario ; Zona periurbana ; Zonaje
L’objectif de cet article est de participer au débat sur la conception de bases de données d’occupation des sols à grande échelle sur les espaces urbains et périurbains. L’article porte sur la photo-interprétation de photographies aériennes et
propose une comparaison entre deux approches : l’une fondée sur l’identification puis la numérisation manuelle de zones homogènes d’occupation des sols en fonction d’une nomenclature déterminée ; l’autre basée sur l’affectation des classes de cette même
nomenclature à des entités spatiales déjà disponibles sous forme numérique, les parcelles cadastrales. Une expérimentation menée sur Gardanne, commune périurbaine située entre Marseille et Aix-en-Provence, permet de montrer l’intérêt de la première approche et
This study aimed to evaluate and to modify remotely-sensed DEMs for an improved quantification of initial sediment mass changes in an artificially-created catchment. DEMs were constructed from photogrammetry-based, airborne (ALS) and ground-based
-by-region for rill, interrill and alluvial areas, based on logical and hydro-geomorphological principles. Additional DEMs were constructed by combining multi-source, modified data. Models were evaluated by comparison with d-GPS reference data