Bank accretion and the development of vegetated depositionalsurfaces along modified alluvial channels
The purposes of this paper are to describe and interpret the initiation and development of bank-depositionalsurfaces and associated revegetation in relation to fluvial recovery from channelization. Special emphasis is given to variation in bank
Sédiments du delta et sols : stratigraphie du delta, profil de sol. Problème de pente de surface opposée : hypothèse de réavancement glaciaire, hypothèse de rebondissement, hypothèse néotectonique, hypothèse de dépôt original. Niveau marin relatif
Effect of rock fragment embedding on the aeolian deposition of dust on stone-covered surfaces
This study investigates how the deposition of dust is affected when rock fragments become gradually more embedded in the ground or, inversely, become more concentrated on the surface. Experiments were executed in an aeolian dust wind tunnel with 8
different types of pebbles. Aerodynamic flow separation and diverging and converging airflow play an important role in the process of dust deposition on stone-covered surfaces.
Wet snow avalanche deposits in the French Alps : structure and sedimentology
Alps (The) ; Avalanche ; Earth surface processes ; France ; Grain size distribution ; Mountain ; Periglacial features ; Sedimentology ; Slope deposit ; Snow
The aim of this paper is to provide some informations on wet snow avalanche dynamics and debris transport through the analysis of 25 snow avalanche deposits on alpine screes in the Ecrins Massif, and in the Devoluy and the Vanoise massifs.
The effect of surface curvature of the deposition of loess : a physical model
The model is tested in a sedimentation experiment with a symmetrical hill (with length axis perpendicular to the flow direction) in a wind tunnel. It appears both from the model and the experiment that loess deposition will occur preferably
Aeolian deposits on a scottish mountain summit : characteristics, provenance, history and significance
Aeolian features ; C 14 dating ; Grain size distribution ; Holocene ; Palynology ; Sand ; Scotland ; Sedimentology ; Surfacedeposits ; United Kingdom
and pollen analysis of buried and intercalated organic horizons, and 3) on determining the origin and provenance of these deposits. The wider significance of this site for understanding the evolution of high-level aeolian deposits is then assessed.
Surficial patterns of debris flow deposition on alluvial fans in Death Valley, CA using airborne laser swath mapping data
depositional zones is an oversimplification of the complex, nonlinear processes acting upon these surfaces.
The AA. utilize fine-scale morphometric measurements to map debris flow deposition and determine if the 2 zones of deposition are consistent between multiple alluvial fans in Death Valley, California. They postulate that the current assertion of 2
Derivation of the chalk superficial deposits of the North Downs, England : an application of discriminant analysis
Cenozoic ; Chalk ; Discriminant analysis ; England ; Grain size distribution ; Heavy minerals ; Model ; Sedimentology ; Surfacedeposits ; United Kingdom
samples, including 39 from published sources, to distinguish between Palaeocene and Plio-Pleistocene deposits, found above the Cretaceous Chalk in southeast England, and to determine parent materials of the soils and superficial deposits of the central
Sky view and weather controls on nocturnal surface moisture deposition on grass at urban sites
In this paper, sky view and weather controls on nocturnal surface moisture deposition are explored using data collected in Vancouver, British Columbia, Canada, during the summers of 1993 and 1996. The study focuses on residential (suburban) areas
Les surfaces géomorphologiques du Piédmont des Mohave Mountains (Arizona), se sont formées sur des dépôts sédimentaires datant du Miocène moyen au Pléistocène et sur des ganglomérats d'origine locale. Les surfaces sont interprétées comme des
Radiocarbon ages and environments of deposition of the Wono and Trego hot springs tephra layers in the Pyramid Lake subbasin, Nevada
This paper presents new information on the age and environment of deposition of the Trego Hot Springs (THS) and Wono layers that indicate the surface of Pyramid Lake lay well below the Sqaw Creek site when the Trego tephra layer was deposited
. The studies indicate that the surface elevation of Pyramid Lake was at or below its spill point to Winnemucca Lake subbasin (1177 m) when the THS layer was deposited and was at its spill point to the Smoke Creek-Black Rock Desert subbasin (1207 m) when
Pollen dispersal and deposition on the Quelccaya Ice Cap, Peru
This study attempts to utilize 15 surface snow samples, taken on the Quelccaya Ice Cap, southern Peru, in late August of 2000, to help answer some basic questions of pollen dispersal and deposition on tropical Andean ice caps.
Effect of rock fragments on eolian deposition of atmospheric dust
Rock fragments in soil: surface dynamics
The effect of rock fragment cover on the deposition of airborne dust was examined in a wind tunnel. Four parameters were studied: pebble size, pebble flattening, cover density and wind speed. The effect of these parameters on the deposition of dust
on the pebbles, on the deposition of dust between and underneath the pebbles, and on total dust deposition was measured separately. Air flow separation seems to play a primary role in the spatial distribution of dust deposition within a rock fragment field
Sub-surface colluviation : an example from West Sussex, UK
Reported here is an unusual type of colluvial deposit whose associated transport pathway involves a substantial subsurface component. The deposit represents the downslope transfer of nitrogen-enriched agricultural soil into a semi-natural woodland
Afrique ; Afrique du Sud-Est ; Aplanissement ; Carte ; Datation ; Géographie de l'Afrique ; Plaine d'accumulation ; Relief tectonique ; Surface d'érosion ; Tectonique
Mesozoic planation surface. Both African and post-African surfaces are widely spread only within areas of loose Mesozoic and Cenozoic deposits. (Ed.).
The age of planation surfaces of SE Africa has been revised. The dominant surface cutting Pre-Cambrian and Lower Paleozoic rocks which L. King considered to be of post-African (locally African) Cenozoic age has been proved to be post-Gondvanian
Model of deposition of loess in central part of the Polish Flysch Carpathians during the last cold stage
Carpathian Mountains ; Eolian features ; Lateglacial ; Loess ; Model ; Poland ; Quaternary ; Surfacedeposits ; Wind
containing lacustrine-boggy deposits of Allerød-Holocene age, as well as on the occurrence of ventifacts and covers of radiocarbon dated Plenivistulian anemoclastic silty-clayey sediments, a dozen metres thick.
Late Cenozoic surficial deposits and valley evolution of unglaciated northern New Jersey
Cenozoic ; Climatic cycle ; Earth surface processes ; Eolian features ; Erosion cycle ; Glacial features ; Interglacial ; New Jersey ; Palaeogeography ; Sea level ; United States ; Valley
This paper describes the surficial deposits and their associated erosional landforms, and the erosional and depositional events and drainage diversions they represent. The paper proposes that the landscape of the study area was shaped by both
Textural features of fluvial and aeolian deposits in the Mark River valley (Belgium)
The valley of the river Mark (Belgium) is filled with deposits of fluvial and aeolian origin accumulated during the Pleniglacial or the beginning of the Late Glacial, not later than 12.000 yr BP. The aim of the investigations was to determine those
textural features of the deposits that would best differentiate them into fluvial and aeolian ones. The analyses of granulometric composition, of the quartz grain abrasion, and of heavy mineral composition were performed as well as the analysis of quartz
grain surface in the scanning electron microscope.
Floodplain sedimentation : a preliminary investigation of contemporary deposition within the lower reaches of the River Culm, Devon, UK
Direct measurements of floodplain sedimentation using plastic grass sediment traps evidence both macro- and microscale spatial variations in deposition which can be related to the duration of inundation, the topography of the floodplain surface
and the flow velocity of the inundating water. Rates of deposition have been estimated from conveyance losses and these have been compared with data obtained from the sediment traps.