Rates of stream incision in the middle part of the Arkansas River basin based on late Tertiary to mid-Pleistocene volcanic ash
Arid area ; Arkansas ; Fluvial erosion ; Lithology ; Pleistocene ; Pliocene ; River bed ; Stream ; Tephrochronology ; United States of America ; Volcanism ; Watershed
Ages and elevations of ash layers correlated with late Tertiary and Pleistocene eruptions in the western US and present stream elevations are used to calculate net rates of incision by streams in the middle reaches of the Arkansas River basin
in the south central US. Major influences on rate of stream incision in the study area include the arid to semi-arid climate of the region, the type of material being incised by streams, stream captures, and salt dissolution in the bedrock that underlies
This paper is a discussion of Rhoads and Kenworthy (1998) Time-averaged flow structure in the central region of a stream confluence, Earth Surface Processes and Landforms, 23, 171-191, that focuses upon the methods to identify secondary circulation
A method of analysing stream channel response to environmental change : gauge data for the Tully River
Australia ; Channel geometry ; Discharge ; Fluvial erosion ; Land use ; Queensland ; Sediment budget ; Stream ; Tropical zone
Gauging data are available from numerous streams throughout Australia, and these data provide a basis for historical analysis of geomorphic change in stream channels in response to both natural phenomena and human activities. The AA. present
Biogenic process ; Biogeography ; Dam ; Fluvial processes ; Montana ; National park ; Rodent ; Sediment budget ; Sedimentation ; Stream ; Stream flow ; United States of America
This study provides additional data on sedimentation and stream flow in order to better understand the efficacy of beaver dams to trap sediment and alter the flow regime of streams, respectively. Data are collected on sedimentation depth (thickness
) and volume, as well as stream velocity and discharge above and below beaver dams in eastern Glacier National Park (GNP), Montana. In addition, measurements of dam and pond morphology are examined in relation to sedimentation and flow alteration patterns.
Tributary-trunk stream relations in a cut-and-fill landscape : a case study from Wolumla catchment, new South Wales, Australia
Australia ; Ecosystem ; Fluvial erosion ; Human impact ; Hydrological regime ; New South Wales ; Sediment transport ; Stream ; Watershed
In this paper, the timing of incision and the relation between trunk stream and tributary streams are explained for Wolumla catchment on the south coast of New South Wales. To date, the linkage of tributary and trunk streams has been neglected
in studies of cut-and-fill landscapes, yet this has significant impacts on the within-catchment transfer of water and sediment. This study also records how human impacts on the character and behaviour of the trunk stream may have profound secondary impacts
During the course of research on soil-landform relationships on a three-dimensional hillslope in the Quantock Hills, Somerset, UK, distinctive patterns of Al distribution have been identified. While soil acidification and its influence on stream
water chemistry have not been studied in detail, the spatial patterns of Al appear to be closely connected with the delivery of soluble Al from a high acidified hillslope to the stream. The aims of this paper are : to investigate the spatial distribution
of Al oxides and exchangeable Al3+ on a podzolised hillslope; and to examine their possible connection with the hydrochemical response of the stream.
Cyclicity in precipitation and stream discharge in Georgia and relationships with the southern oscillation
Climate oscillation ; Discharge ; Georgia (USA) ; Ocean atmosphere interaction ; Precipitation ; Spectral analysis ; Stream ; Teleconnection ; Time series ; Twentieth Century ; United States of America ; Water cycle ; Watershed
The AA. examine both the cyclic and SO effects on precipitation and stream flow in Georgia with a view to better understanding the vagaries of hydrological conditions. To achieve these objectives, stream discharge at 10 U.S. Geological Survey stream
A pilot study on needle ice induced stream-bank erosion in the Mashai Valley, Lesotho Highlands
The likely impact of needle ice processes in the bank erosion system in Lesotho Highlands is examined. It was found that despite the significance of frost activity during winter, rain wash and stream discharge are more effective in sediment
mobilization on stream-banks than are needle ice plays an active role in sediment mobilization throughout much of winter and is an important indirect erosion agent by disaggregating earth materials for easy fluvial removal. - (AJC)
The morphologic structure of step-pools in mountain streams
California ; Channel geometry ; Discharge ; Fluvial dynamics ; Grain size distribution ; Longitudinal section ; Model ; Mountain ; River bed ; Stream ; United States of America
The purpose of this paper is to report a field-based investigation on the geometric structure of step-pools in the Santa Monica Mountain streams. The step-pool morphology is evaluated empirically in light of variations in a downstream direction
The particle size of the bed sediments in or on many natural streams, alluvial fans, laboratory flumes, irrigation canals and mine waste deltas varies exponentially with distance along the stream. A plot of the available worldwide exponential bed
particle size diminution coefficient data against stream length is presented which shows that all the data lie within a single narrow band extending over virtually the whole range of stream lengths and bed sediment particle sizes found on Earth.
Distribution of organic carbon in bed sediments of Manoa stream, Oahu, Hawaii
Biogeochemistry ; Carbon ; Ecosystem ; Grain size distribution ; Hawaii ; Organic materials ; Sediment load ; Spatial distribution ; Stream ; Tropical zone ; Watershed
sediment grain size in a tropical perennial stream, to examine the influence of individual grain size fractions on the mass of OC stored over a 6 km channel length, and to explore the longitudinal distribution of bed sediment grain size and OC within Manoa
In this response to Lane et al. (1999) Time averaged flow structure in the central region of a stream confluence : a discussion, Earth Surface Processes and Landforms, 24, 361-367, the AA. show that their method for decomposing the cross-stream
, helical motion to the pattern of cross-stream flow at confluences.
The use of tracers to study sediment sources in three streams in northeastern Oregon
Bank erosion ; Drainage network ; Land use ; Oregon ; Sediment load ; Stream ; Suspended load ; Tracer ; United States of America ; Watershed
This pilot study used sediment tracers to identify general source areas of channel bottom sediment within three tributaries of the Umatilla and upper Grande Ronde basins in northeastern Oregon. Land use in each stream was dominated by agriculture
, logging or grazing. The nuclear bomb-derived radionuclide Cs 137, carbon, and nitrogen were used as tracers to fingerprint sediment sources. Sediment was collected from the stream bottom inside the active channels and compared to samples from the surface
The distribution of solute processes on an acid hillslope and the delivery of solutes to a stream : I. exchangeable bases
This paper aims to identify the spatial distribution of exchangeable base cations in soils on an acid hillslope, (Quantock Hills, Somerset, UK), and to investigate possible cation release processes from slope soils to the stream. The basic
the activity of such faults involves variations or rotations of the preferential stream orientations. Two areas of Central Italy have been investigated.
Recently, it has been shown that a very strong worlwide correlation exists between exponential bed particle size diminution coefficients for mobile bed subaerial aqueous flows of all kinds and the lengths of the corresponding stream segments
correlations exist between these bed concavity coefficients and both the corresponding stream segment lengths and bed particle size diminution coefficients.
Determining the times and distances of particle transit in a mountain stream using fallout radionuclides
This study demonstrates a new technique which uses 7Be, 210Pb, and 137Cs to trace the movement of sediment from the landscape through the stream channel and to estimate residence time and transport distance. Five sampling sites were located along
The aim of this paper is to define the boundary conditions and the constraints of different approaches for the prediction of bedload transport in high gradient streams. The whole set of data measured on the Rio Cordon will be used for this purpose.