Geochemical equilibria of iron in sediments of the Roaring River alluvial fan, Rocky Mountain National Park, Colorado
Colorado ; Cône alluvial ; Eau du sol ; Etats-Unis ; Fer ; Fluviatile ; Géochimie ; Matière organique ; Précipitation ; Rocky Mountains ; Variation spatio-temporelle
Alluvial cone ; Colorado ; Fluvial processes ; Geochemistry ; Iron ; Organic materials ; Precipitation ; Rocky Mountains ; Soil moisture;Soil water ; United States
Iron geochemistry of the sediments and interstitial waters of the Roaring River alluvial fan in the Rocky Mountain National Park, was studied using a chemical equilibria approach. The presence of a well-dated deposit with well-defined hydrological
conditions has enabled to investigate the chemical equilibria of iron in a field setting by sampling sediments, buried soils, stream, and interstitial waters using various chemical and mineralogical analyses.
The role of alluvial fans in the mountain fluvial systems of southeast Spain: implications of climatic change
Alluvial cone ; Alluvium ; Almería ; Arid area ; Climatic variation ; Fluvial dynamics ; Mountain ; Murcia ; Sediment transport ; Semi-arid area ; Spain
This paper deals with the mountain front alluvial fans in the semi-arid areas of Murcia and Almeria provinces. It attempts, by mapping the location of alluvial fans, then their classification into aggrading or dissecting fans, to identify the extent
to which the mountain fluvial systems are buffered by aggrading alluvial fans or exhibit channel continuity through the mountain front environment. It further considers the implications of climatically induced changes between aggradational and dissectional
Alluvion ; Cours d'eau ; Erosion des sols ; Estuaire ; Etats-Unis ; Fluviatile ; Minéralogie ; North Carolina ; Plaine alluviale ; Plaine côtière ; Sol alluvial ; Sédimentaire
Alluvial plain ; Alluvial soil ; Alluvium ; Coastal plain ; Estuary ; Fluvial processes ; Mineralogy ; North Carolina ; Sedimentary ; Soil erosion ; Stream ; United States
Despite high erosion rates in the North Carolina Piedmont and extensive sediment delivery to Coastal Plain reaches of Piedmont-draining streams, sediment budget studies and estuarine sedimentology suggest that relatively little Piedmont-derived
A cellular model of Holocene upland river basin and alluvial fan evolution
Alluvial cone ; Climatic variation ; Flood ; Holocene ; Land use ; Model ; Palaeogeography ; Sediment transport ; United Kingdom ; Watershed
flood over the last 9200 years, using a rainfall record reconstructed from a peat bog wetness indices and land cover history derived from palynological sources. Model results show that the simulated catchment sediment discharge above the alluvial fan
In this paper the CAESAR (Cellular Automaton Evolutionary Slope And River) model is used to simulate the Holocene development of a small upland catchment and the alluvial fan at its base. The model operates at a 3 m grid scale and simulates every
closely follows the climate signal, but with an increase in the amplitude of response after deforestation. The important effects of sediment storage and remobilization are shown.
Sediment entrainment potential in modified alluvial streams : implications for re-mobilization of stored in-channel sediment
Carrying capacity ; Channel geometry ; Deforestation ; Fluvial erosion ; Grain size distribution ; Human impact ; Land use ; Sediment load ; Spatial variation ; Stream ; Tennessee ; United States of America
This study examines spatial patterns of sediment entrainment potential in 3 alluvial streams in the Lower Hatchie River Basin of western Tennessee with a history of channelization and significant land use change (historic deforestation). The purpose
is to determine if the streams have enough energy to transport the volumes of material they receive via bank failure processes. The results suggest that there is great potential for in-channel sediment storage features to be reworked and to serve as secondary
Alluvial channel ; Carrying capacity ; Channel geometry ; Fluvial processes ; Illinois ; Model ; Sedimentology ; Stream flow ; United States
south of Champaign, Illinois. Data were collected on channel form, gradient, alternate bar dimensions, bar sediment size, and flow conditions over a two-year study period.
Alluvial plain ; Climatic variation ; England ; Fluvial processes ; Holocene ; Human impact ; Scotland ; United Kingdom
Episodes of regional and country-wide Holocene alluviation in British river basins are identified using information from 59 published sites that extend from northern Scotland to the south coast of England. Widespread synchrony of Holocene fluvial
episodes in Europe and USA, particularly over the last 5000 years, suggests that climate may have more directly controlled sedimentation and erosion in British rivers than hitherto been believed. Although prehistoric and historic forest clearance
Holocene alluvial fills in the south Loup valley, Nebraska
I is younger than 900 C 14 yr B.P. Regional contemporaneity of valley alluviation in the eastcentral Great Plains suggests that climate has controlled long-term sediment storage in the South Loup River valley.
Four holocene alluvial fills are present. Fill IV, the oldest and thickest, was deposited between 10 200 and 4 800 C 14 yr B.P.| Fill III has an age of about 3 000 C 14 yr B.P.| Fill II is younger than 2 100 and older than 900 C 14 yr B.P.| and Fill
Braided stream aggradation on an alluvial fan margin : Emerald Lake fan, British Columbia
Alluvial cone ; Braided channel ; British Columbia ; Canada ; Cold area ; Fluvial processes ; Grain size distribution ; Meltwater ; Pic discharge ; Sediment transport ; Stream flow ; Summer
Etude des processus de transport sédimentaire et de formation de chenaux anastomosés sur la marge distale d'un cône alluvial actif, Lac Emerald, Colombie Britanique, en période de débit maximum, mi-saison estivale.
Late Vistulian and Holocene fossil soils developed from aeolian and alluvialsediments of the Warsaw Basin
Stratotype profiles of fossil soils of the Late Vistulian and Holocene developed from alluvial and aeolian sediments were recognized. Different analyses and radiocarbon dating of organic substance enabled to distinguish diagnostic pedostratigraphic
horizons, what allowed to determine the age and produce a typology of soils. On the basis of soil dating, indirectly a precise determination of alluvial and aeolian processes in the Warsaw Basin was carried out. The bottom of organic substance of the oldest
among fossil soils in the Warsaw Basin was dated for 13,340 years B.P. The mineral sediments of this horizon are still older.
Persistent alluvial fanhead trenching resulting from large, infrequent sediment inputs
Alluvial cone ; Landslide ; Model ; Mountain ; New Zealand ; Precipitation ; Slope dynamics ; South Island ; Watershed
inputs of sediment from landslides in the mountain basins upstream, superimposed on a time-variant sequence of lesser sediment inputs from rainstorm-generated erosion. They embed their results in a dynamic equilibrium concept to underline
their significance for models of alluvial fan morphodynamics in general.
High Resolution DEMs for the analysis of fluvial and ancient anthropogenic landforms in the alluvial plain of Padua (Italy)
Alluvial plain ; Digital elevation model ; Human occupation ; Italy ; LiDAR ; Padua ; Palaeogeography ; Remote sensing ; Sedimentary ; Veneto
Italia ; LiDAR ; Llanura aluvial ; Modelo numérico de terreno ; Ocupación humana ; Padua ; Paleogeografía ; Sedimentario ; Teledetección ; Véneto
of the Brenta River, later occupied by a minor course, the Bacchiglione. Early archaeological evidence dates back to the final Bronze Age and the first urban settlement started in the Iron Age. The underground of the city centre consists of alluvialsediments
The alluvial plain around Padua results from the sedimentary activity of the Brenta and the Bacchiglione rivers since the last glaciation to the modern times. The inner and oldest part of the city developed on the banks of a former meander
This paper describes different conceptual facies models intervening in alluvial soil formation in the case of the Sarine River floodplain, a partially embanked floodplain situated in the northwest of the Swiss Alps. Alluvial soils are submitted
to processes of deposition and erosion and exhibit various characteristics reflecting the composition and properties of the material transported. Moreover, these processes of sedimentation and erosion vary in space and time and contribute thus
Arcilla mineral ; Geoquímica ; Grecia ; Llanura aluvial ; Mineralogía ; Pedogénesis ; Propiedades del suelo ; Régimen hídrico ; Taxonomía ; Vertisol
) is the dominant clay mineral and was mainly inherited from the parent sediments and by neoformation. The pedons located in the highest points of the alluvial plain were classified as Chromic Haploxererts and those in the lowest landscape were classified as Typic
Four pedons from the alluvial plain of Drama (NE Greece) were investigated in order to provide detailed information on their morphology, chemical, physical and mineralogical properties, classification and genesis. Smectite (montmorillonite
Haploxererts. The properties of these Vertisols reflect the impact of climate (alternating wet–dry periods), landscape position (alluvial plain; seasonally water saturated), and parent material (clayey, smectite-dominated fluvio-lacustrine, highly calcareous
Paleoclimatic significance of late Quaternary lacustrine and alluvial stratigraphy, Animas Valley, New Mexico
Datation C 14 ; Etats-Unis ; Holocène ; New Mexico ; Niveau lacustre ; Paléoclimat ; Quaternaire ; Stratigraphie ; Sédiment lacustre
C 14 dating ; Holocene ; Lacustrine sediment ; Lake level ; New Mexico ; Palaeoclimate ; Quaternary ; Stratigraphy ; United States of America
The purpose of this study is to use lacustrine and alluvial stratigraphy, landforms, soil evidence, and radiocarbon ages to econstruct the latest Quaternary geologic history of the southern Animas Valley, New Mexico. Because the late Quaternary
Absence of caesium-137 from recent sediments in eastern Australia. Indications of catchment processes?
Here the AA. report on a reconnaissance survey of the 137Cs content of recent alluvialsediments in the Hunter valley, N.S.W., Australia. They attribute the absence of 137Cs from recent sediments, in part, to the nature and magnitude
of the catchment processes associated with the entrainment and subsequent deposition of the sediments.
Dating recent alluvialsediments in the Wicklow Mountains
Modern floodplain sediments in the Wicklow Mountains display a stratigraphy and sedimentology that contrasts them with earlier Holocene alluvium. This paper presents the results of a C 14 dating programme the objects of which were to date : a) more
to a clearer understanding of the sourcing and dynamics of the modern style of sedimentation.