2 edition of Sediment transport and bed morphology at river channel confluences. found in the catalog.
Sediment transport and bed morphology at river channel confluences.
James L. Best
Written in English
|Series||Sedimentology -- v.35, no.3|
Sediment transport and bed morphology at river channel confluences Sediment transport and bed morphology at river channel confluences BEST, JAMES L. Department o Geology, University o Hull, Hull, HU6 7RX, U K f f ABSTRACT River channel confluences form important morphological elements of every river system, being points at which rapid changes in flow, sediment . In geography, a confluence (also: conflux) occurs where two or more flowing bodies of water join together to form a single channel. A confluence can occur in several configurations: at the point where a tributary joins a larger river (); or where two streams meet to become the source of a river of a new name (such as the confluence of the Monongahela and Allegheny rivers at Pittsburgh, forming.
hydrological events. Bed load sediment transport and bed morphology at low lands have been observed and measured in medium-size (Lane & Richards, ; Rhoads & Sukhodolov, ) and for large-scale river confluences (Rhoads, ; Parsons et al., ). However, no detailed description of these parameters could be found at alpine confluences. sediment, and morphology at a confluence, and its behaviors, differ greatly in tidal and non-tidal environments. Existing studies of the river junctions provide a good account of information about the hydrodynamics and bed morphology of the confluent areas, especially the unidirectional ones.
River bed and floodplain sediments are a direct reflection of river channel processes. This paper examines sediment transfer processes at river junctions, using as a case study the River Kas, a tributary of the River Mula, Godavari basin, Maharashtra, India. The distribution of the phosphorus (P) adsorption in a bed sediment at channel confluences is an important issue for understanding the transport of contaminants in channel networks. In this study, the flow structure and its effect on the P distribution in the bed sediment were investigated in a 90° confluence flume.
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James L. Best, "Flow Dynamics at River Channel Confluences: Implications for Sediment Transport and Bed Morphology", Recent Developments in Fluvial Sedimentology, Frank G.
Ethridge, Romeo M. Flores, Michael D. Harvey. A model of sediment transport and bed morphology links these features to the fluid dynamics of these sites. An understanding of confluence dynamics is important not only in considerations of channel morphology and design criteria but must form the basis for the interpretation of confluence sediments in the ancient by: River confluences are notable features in the drainage system with complex hydrodynamics, bed morphology, sediment transport, and mixing processes.
Junction planform plays a pivotal role in the. River channel confluences form important morphological elements of every river system, being points at which rapid changes in flow, sediment discharge and hydraulic geometry must be accommodated.
This article presents results of a quantitative. Book. Jan ; V.A. Vanoni All these results suggested that sediment transport, bed morphology and contaminant transport in the distorted shear layer at city channel confluences may differ.
Morphology, flow structure, and suspended bed sediment transport at two large braid-bar confluences Ricardo N. Szupiany,1 Mario L. Amsler,1 Daniel R.
Parsons,2 and James L. Best3 Received 9 July ; revised 6 February ; accepted 3 March ; published 19 May  Mid-channel bars and their associated confluences are key. Best () characterized the sediment transport and morphology channel confluence by a scour hole in center of the confluence, avalanche face and various deposition areas.
Fig. 2 shows the typical morphology of confluence. This study and some other works (e.g. Mosely, ; Ashmore & Parker, ; Biron et al., ; Shakibaeinia et al.,; Rhoads et al., ; Riley and.
Bed morphology and bed constitution Two investigated situations: 1) bed load transport in both rivers and 2) bed load transport only in the tributary Leclair and Roy  Moderate (ratio between the height of the step and the flow depth is around ) (1) – (2) – Bed morphology Measurements during the dry season.
The difference in height between the bed levels of the tributary and main channel and is highly influences the hydrodynamics of confluences. This discordance is commonly the result of the bars – due to sediment transport - at the mouth of each confluent channel.
Concordant Bed 18 Discordant Bed. Fig. 1 Planform geometry and bathymetry at the confluence of the Ebro River and the Segre River. The contours corresponds to lines of constant vertical elevation, z/D, where the free surface is situated at z/D = 0 and z is positive upwards.
Also shown are the cross-sections where the solution is analyzed - "Stratification effects on hydrodynamics and mixing at a river confluence with. T1 - Sediment transport and bed morphology at river channel confluences. AU - BEST, JAMES L.
PY - /1. Y1 - /1. N2 - River channel confluences form important morphological elements of every river system, being points at which rapid changes in flow, sediment discharge and hydraulic geometry must be accommodated. Secondary flow intensity and turbulence intensity are the main factors that lead to scour hole formation in confluences.
The junction angle primarily determines the bed morphology and sediment tran. River confluences play an important role in the drainage of a catchment and transport of sediments and pollutants within this area.
Riverbed morphology at these important nodes of the river drainage network might be very complex as shown by numerous laboratory studies in movable bed models and scarce bathymetric surveys in the field.
Different parameters were varied in laboratory confluences. The interactions between water and sediments conveyed by the converging channels largely govern the morphology of river confluences (Kennedy, ; Best, ; Boyer et al., ; Rhoads et al., ; Leite Ribeiro et al.,among others) but the effects of water discharge and sediment discharge have seldom been isolated from each other, either in nature or in the laboratory.
The knowledge of the dynamics of urban channel confluences is insufficient as most past studies have focused on natural river confluences. This paper reports experimental observations on bed morphology and hydrodynamics of the urban confluences and their dependence to the discharge ratio.
This work has had led to: (1) improved understanding of how the flow and upstream sediment supply interact with channel geometry and bed-sediment grain size, (2) improved and new methods for accurately measuring sediment transport over long timescales, (3) improved methods for serving and visualizing river flow and sediment data on the web.
Coherent Flow Structures in Open Channels presents the first integrated treatment, across a wide range of spatial and temporal scales, of the origins and characteristics of coherent fluid motions and their influence on sediment transport and bed morphology.
This book contains contributions from an international and interdisciplinary authorship who are responsible for many of the recent. 1D SEDIMENT TRANSPORT MORPHODYNAMICS.
with applications to. Effect of Hydrograph on Morphology of Gravel-bed Streams Aggradation and Degradation of Rivers: Backwater Formulation. Response of a Sand-bed River to a Dredge Slot. Morphodynamics of Recirculating and Sediment-Feed Flumes. River Confluences and the Fluvial Network brings together state of the art thinking on confluence dynamics tributary impacts and the links between processes at these scales and river network functions.
The book is unique in focus, content, scope and in bringing together engineering, ecological and geomorphological approaches to the three key. Channel confluences are important sites where adjustments in flow structure, sediment transport and channel morphology occur to accommodate the convergence of water and sediment from different branches [8,9].Common morphologic features often include a scour hole typically oriented along the direction of maximum velocity, avalanche faces at the mouth of each branch, sediment deposition.
Braided rivers are characterized by a large number of bars and islands confluences, constrictions and bifurcations of the flow (the so-called “nodes”) where occur a complex diversity of coherent flow structures interacting each other with the river bed and the sediment transport.River channel confluences play a major role in the dynamics of all fluvial systems, and yet our understanding of bed load routing at these sites is very sparse.
The dynamics of confluences are a function of the momentum ratio between the combining flows and the three-dimensional geometry of the junction. Recent experiments have shown that discordance in bed height between the confluent rivers.
Best, J.L.: Flow dynamics at river channel confluences: implication for sediment transport and bed morphology. In: Recent Development in Fluvial Sedimentology, SEPM Special Publication The Society of Economic Paleontologists and Mineralogists, Tulsa, Oklahoma, pp.
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