An experimental study of the profiles of wind speed, shearing stress and turbulence at the crest of a large hill
atmosphérique ; Profilvertical ; Sol ; Topoclimat ; Turbulence ; Vent ; Vitesse du vent
Présentation d'observations réalisées entre juin et octobre 1977 sur le profilvertical du vent au-dessus d'une colline d'altitude relative h=170mètres (Black Mountain, 811m, à proximité de Canberra, Australie). Un maximum local de vitesse (jet) est
Through investigating 11 profiles of the bar, two types of vertical depositional sections are recognized, one dominated by large trough cross-bedding and the other by opposite inclined bedding. The point bar is divided into six sub-facies according
Sensitivity of bed shear stress estimated from vertical velocity profiles : the problem of sampling resolution
stress of varying 1) the range of flow depths from which observations are obtained, and 2) the lowest elevation of a measurement point above the bed, are examined. These issues are investigated using a high vertical definition of velocity measurements
Granulometric investigations of loess profiles in Hungary
The A. investigates the applicability of granulometric indices for the reconstruction of past environments. This paper concentrates primarily on the study of variation in the verticalprofile of deposits. Along with other indices, fineness grade
The soil erosion bridge: a device for micro-profiling soil surfaces
The soil erosion bridge is a simple, robust, cheap, lightweight device comprising a bar which, when mounted on two stakes, provides a stable datum for micro-profiling the soil surface beneath. Its main advantage over similar devices is the unique
combination of mounting clamps, which allow for variation in the distance and angle with respect to the vertical of the mounting stakes without loss of accuracy. The design, installation and measurement procedures are described. Applications and limitations
Near-bed mass flux profiles in aeolian sand transport : high-resolution measurements in a wind tunnel
Verticalprofiles of the streamwise mass flux of blown sand in the near-bed (
flux and mean velocity profiles throughout the boundary layer depth (0.17 m) using passive, chambered sand traps of small dimensions and armoured thermal anemometers, respectively. The data permit a preliminary analysis of the relations between
the observed forms of the profiles of near-bed fluid stress and horizontal mass flux within a carefully conditioned boundary layer.
vary with flow discharge. In parallel, an attempt is made to relate average vertical velocity profiles and derived estimates of the components of shear stress to the generally used average reach values derived from energy gradient and mean flow depth.
The main objectives of this study were, therefore : to determine average characteristics of velocity profiles above pools and riffles in an attempt to differentiate between grain and form-related stress, and to determine how these characteristics
On overlapping sections and drill cores of an autochthonous paleosoil and the saprolite underneath, the morphological, geochemical and mineralogical zonation of a complete profile of the weathering mantle has been reconstructed. The data indicate
Floodplain ; Fluvial deposit ; Fluvial hydrology ; Fluvial processes ; Geomorphology ; River bed ; Vertical movement
Critères morphologiques de l'accumulation sédimentaire directionnelle provoquant la transformation du profil longitudinal du cours d'eau. Evaluation des mouvements verticaux du lit par des processus fluviatiles, de la structure du lit et de la
This study attempts to apply pedology to resolve the factors controlling the geomorphic evolution of terraces in the Pakua tableland. In this study, the weighted mean profile development index (PDI or WPDI) and the amounts of Fe and Al in soils
Seismic data have been collected along 4 dense wide-aperture profiles, that run SW-NE for a total length of ~6 km in the hangingwall of the Paganica-S. Demetrio Fault, source of the 6th April 2009 L’Aquila normal-faulting earthquake. Seismic
. In the Paganica area, Vp images unravel large steps in the substratum related to 2 unreported SW-dipping buried strands, synthetic to the Paganica Fault, with ~250 m associated total vertical throw. This finding has important implications on the long-term history
of the Paganica- S. Demetrio Fault system, whose total vertical displacement has been previously underestimated. An additional ~250 m vertical offset along this complex Quaternary extensional structure should therefore be considered. - (NF)
This paper describes a quantitative floodplain growth model based on the unsteady nature of the vertically accreting channel-expansion floodplains along the Powder River. This river is one of the few relatively large unregulated rivers in the United
, Italy) present some features that are intermediate between shore platforms and plunging cliffs. Four types of profile have been identified ; they have near-horizontal to steep surfaces, often showing an almost vertical step in the seaward margin
isobarique 850 mb ; Northwestern Australia ; Perturbation cinématique ; Perturbation tropicale ; Profilvertical ; Satellite GMS ; Télédétection ; Vent ; Vitesse du vent ; Zone intertropicale
(1980) ; Australie ; Circulation atmosphérique ; Cisaillement vertical ; Cyclone tropical ; Dynamique de l'atmosphère ; Eté ; Géographie physique ; Image satellite ; Ligne de flux ; Mousson ; Mousson australienne ; Niveau isobarique 200 mb ; Niveau
. L'évolution s'explique par l'environnement synoptique: un flux d'est rapide en altitude et un fort cisaillement vertical suffisent à inhiber l'intensification de la dépression. (JPB).
. La plupart des tornades se développent dans un rayon de 100 km autour du centre du cyclone, dans un secteur d'intense convergence et de fort cisaillement vertical. L'existence de vents beaucoup plus forts au niveau 850 mb qu'en surface constitue une
Spatial distribution of rock fragments in cultivated soils in northern Ethiopia as affected by lateral and vertical displacement processes
of rock fragment cover along catenas, and the vertical variations in volumetric rock fragment content in soil profiles in the highlands of Tigray, northern Ethiopia. Natural and anthropogenic processes inducing these patterns are assessed.