Sizedistributions of saltating grains : an important variable in the production of suspended particles
Aeolian dust ; Aeolian features ; Aeolian transport ; California ; Grainsizedistribution ; Lake ; Loam ; Sand ; Soil properties ; United States of America
The AA. present newly developed sizedistribution information for saltating particles for experiments where the ratio Fa/q had been measured. The data may then be examined to see if any clear-cut behaviour of Fa/q with sizedistribution can
be observed. The results for the Owens Lake loam soil of Gillette et al. (1997) are used in the discussion for comparison. Soils from which the saltating particles originated (parent soils) were processed for sizedistributions in the same ways as the airborne
. Different sediments were used in order to study the effect of grainsize. The proposed relationship show considerable variations with grainsize and there is only a minor effect of rainfall on the transport capacity which also seems to be grainsize
by superparamagneic, single domain, and multidomain ferrimagnets at low temperatures and use these as a measure of the relative importance of these grain-size fractions in the magnetic enhancement of paleosols.
Grain-size sorting in meander bends containing large woody debris
Channel geometry ; Grainsizedistribution ; Illinois ; Meander ; Photointerpretation ; River bed ; Stream ; United States of America
This study examines the influence of large woody debris, LWD, on grain-size sorting in 3 meander bends in a low-gradient river in the Midwestern United States, in northern Illinois. The detailed nature of the modifications appears to be highly
Development of algebra algorithms for automated generation of grain-sizedistribution maps
Algorithm ; Automated mapping ; Connecticut ; Geographical information system ; Grainsizedistribution ; Italy ; Pool ; Sedimentology ; Spatial distribution ; Strait ; United States of America ; Veneto ; Venice
Algorithme ; Cartographie automatique ; Connecticut ; Distribution spatiale ; Détroit ; Etats-Unis ; Granulométrie ; Italie ; Lagune ; Système d'information géographique ; Sédimentologie ; Veneto ; Venezia
In this work, 4 map algebra (MA) algorthms are written in a GIS environment to automatically produce maps depicting the spatial distribution of sediment texture classes based on the most frequently used grainsize TDs : the Shepard classification
and Flemming classification for sand-silt-clay components, and the Folk et al. classification and Blair and McPherson classification for sand-gravel-mud components. The proposed method allows rapid assessments by producing map distributions of the parameters
Aeolian features ; Arid area ; Burkina ; Discriminant analysis ; Drought ; Eolian deflation ; Grainsizedistribution ; Land use ; Microstructure ; Sahel ; Sedimentology ; Wind erosion
The aim of this paper is to identify possible sources for the material found in nebkhas in northern Burkina Faso. Grain-sizedistributions of nebkhas sediments and five other subenvironments were analyzed using univariate and multivariate methods
. Quartz-grain surface textures were studied by Scanning Electron Microscopy (SEM). The SEM and grain-size analyses together indicate that the nebkhas have experienced considerable recent aeolian abrasion and sorting.
Downstream variation in grainsize along an Alpine river : analysis of controls and processes
Braided channel ; Grainsizedistribution ; Gravel ; Human impact ; Hydraulic works ; Italy ; River bed ; Sediment load ; Stream ; Trentino-Alto Adige
This study concerns downstream variation in bed material size along a 115-km reach of the Piave River in north-eastern Italy. This river drains a region producing high sediment yields (the Dolomites and the Prealps) and has a braided pattern along
half of its length. The A. analyses the changes of bed material size in the downstream direction and explains these changes in the light of both natural and anthropogenic factors.
to the intensity of dispersion using temporal variation and microscopic evidence. Problems in blending the results from 2 separate lenses are discussed and consideration is also given to subsampling bias and its contribution to the resultant grain-sizedistribution.
Distribution of organic carbon in bed sediments of Manoa stream, Oahu, Hawaii
Biogeochemistry ; Carbon ; Ecosystem ; Grainsizedistribution ; Hawaii ; Organic materials ; Sediment load ; Spatial distribution ; Stream ; Tropical zone ; Watershed
Bassin-versant ; Biogéochimie ; Carbone ; Charge solide ; Cours d'eau ; Distribution spatiale ; Ecosystème ; Granulométrie ; Hawaii ; Matière organique ; Zone intertropicale
sediment grainsize in a tropical perennial stream, to examine the influence of individual grainsize fractions on the mass of OC stored over a 6 km channel length, and to explore the longitudinal distribution of bed sediment grainsize and OC within Manoa
To evaluate the magnitude of variation in grainsizedistribution in the Krishna river, bed sediments and suspended sediments collected along the length of the river have been studied. There are both temporal and seasonal variation in the grainsize
distribution of suspended sediments. The statistical parameters show the change along the river in a non-linear fashion which may be due to human interference and due to different types of sediments contributed by tributaries to the Krishna river.
Statistical analysis of grainsizedistribution in Pleistocene sediments from Lake Biwa, Japan
Time series of grain-sizedistributions from Pleistocene sediments deposited in Lake Biwa during the past 550 millennia show dominant periods of 40,000 and 20,000 yr that are very close to those predicted by the Milankovitch theory, as well
The statistical analysis of the sand grainsizedistribution of Al Ubaylah barchan dunes, Northwestern Ar-Rub-Alkhali desert, Saudi Arabia in Saudi Arabia. (L'Arabie Saoudite)
Ar Rab' Al-Khali ; Arabie saoudite ; Barkhane ; Distribution statistique ; Dune ; Désert ; Eolien ; Granulométrie ; Géographie de l'Asie ; Sable
Validation of algorithms to retrieve snow grainsize and impurities using airborne multispectral scanner data of eastern Hokkaido
Albedo ; Cloud ; Data processing ; Grainsizedistribution ; Hokkaido ; Japan ; LANDSAT ; Pool ; Remote sensing ; Sea ice ; Snow ; Spectral reflectance
) in eastern Hokkaido, Japan. The algorithms using remote-sensing data to retrieve the snow grainsize and the concentration of snow impurities were used for a theoretical Bidirectional Reflectance Distribution Function (BRDF) model of the snow surface
Preliminary validation of algorithms to retrieve snow grainsize and impurities was conducted by applying them to Airborne Multispectral Scanner (AMSS) data at the flat snowfield (February 1998) and on sea ice in Saroma Lagoon (February 2001
Harmattan dust deposition and particle size in Ghana
Aeolian dust ; Aeolian features ; Agropedology ; Arid area ; Ghana ; Grainsizedistribution ; Loess ; Research technique ; Sampling ; Sediment transport
This paper describes the development of sampling techniques for monitoring the Harmattan dust deposition in Ghana. It compares 3 different methods to trap the Harmattan dust and describes the difference in amount and particle sizedistribution
Provenance and dispersion of fluvial, beach and shelf sands in the Bassa Maremma coastal system (central Italy): an integrated approach using Fourier shape analysis, grainsize and seismic data
This study is an analysis of geographically related surface samples from offshore, fluvial and sandybeach environments, along a section of coast northeast of Rome, Italy. It examines the potential of size and Fourier shape analysis to define
This paper focuses on the features of grain composition, based on data from various samples of debris flows in different regions and gullies, and their potential actions on debris flows. Samples are collected from gullies in Beijing, Gansu, Sichuan
The AA. determined the quantitative mineralogical compositions of various grainsize fractions of soil samples that were collected from 10-cm depth intervals. The results show that the grainsizedistribution curve of a given mineral is related
The aim of this study is, first, to determine if the effective particle sizedistribution measured by a laser diffractometer is comparable to the effective particle sizedistribution measured by the sieve-pipette method, and second, to determine
Mining soil databases for landscape-scale patterns in the abundance and sizedistribution of hillslope rock fragments
California ; Grainsizedistribution ; Hawaii ; Mining activity ; Precipitation ; Regolith ; Rock fragment ; Sierra Nevada ; Slope ; Slope dynamics ; Soil properties ; Statistical distribution ; United States of America ; Washington State
California ; Cascade Mountains ; Distribution statistique ; Dynamique de versant ; Etats-Unis ; Exploitation minière ; Fragment de roche ; Granulométrie ; Hawaii ; Météorisation ; Propriétés du sol ; Précipitation ; Régolithe ; Sierra Nevada
The AA. explored the utility of soil survey databases for data mining, with the goals of identifying landscape-scale patterns in the abundance and sizedistribution of rock fragments (diameter D>2mm) and potential controls on grainsize production
and transport, constructed depth-averaged grainsizedistributions and calculated the mass fraction of rock fragments and the median rock fragment grainsize. They also categorized as bimodal, sizedistributions with a clear ‘breakpoint’ between fine and coarse