sediment transport Articles
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FORUM: Similarity between the processes of sediment transport and human life cycle
This forum muses on how we cannot live without interacting with the soils and the land, and how sediment processes and transport may be likened to the human experience.Keywords: sediment transport, sediment processes, ...
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Flow and high sediment yield from the Huangfuchuan watershed
This study deals with general features of sediment transport in the Huangfuchuan river, an important branch river of the Yellow river, draining the Loess Plateau in China. The long-term precipitation records at 3 climate stations near the watershed have been used to assess the changes in precipitation in this region. By introducing metrics for runoff and sediment transport, long-term observations ...
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Jökulhlaups and sediment transport in Watson River, Kangerlussuaq, West Greenland
For 3 years, during a 4-year observation period (2007–2010), jökulhlaups were observed from a lake at the northern margin of Russells Gletscher. At a gauging station located on a bedrock sill near the outlet of Watson River into Sdr Strømfjord, discharge and sediment transport was monitored during the jökulhlaups. The stage rose up to 5.3 m and a maximum discharge of ...
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Particle velocity and sediment transport at the limit of deposition in sewers
This paper focuses on the sediment particle while it is transported at the limit of deposition in storm sewers, i.e. as bed load at the limit of concentration that leads to sediment deposition. Although many empirical sediment transport equations are known in the literature, there is only limited knowledge concerning particle velocity. Sediment particle and sphere velocity measurements were ...
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Sea wave propagation from offshore to Maputo's coast. Application to longshore sediment transport assessment
This study aims to characterize the wave climate near the coastal region of Maputo (Mozambique), and to provide a first assessment of the sediment transport load in this area. A time-series of 13 years' worth of offshore wave data, obtained from reanalysis products, was propagated to the coast. Wave propagation was performed using Linear Wave theory and the numerical model, Simulating ...
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Prediction of local scour depth at bridge piers under clear-water and live-bed conditions: comparison of literature formulae and artificial neural networks
The scouring effect of the flowing water around bridge piers may undermine the stability of the structure, leading to extremely high direct and indirect costs and, in extreme cases, the loss of human lives. The use of Artificial Neural Network (ANN) models has been recently proposed in the literature for estimating the maximum scour depth around bridge piers: this study aims at further ...
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SediLink radio modem on a SediMeter
The SediLink radio modem can be mounted directly on a SediMeter SM3A for lab use. This is useful for instance in a physical model of an engineering project where the objective is to study sediment transport. Later the same equipment can be used to verify the predictions in the field, but with an extension cable between the SediMeter and the radio modem—and a buoy so it gets up above the ...
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Continuous simulation of suspended sediment through a stream section
This paper presents the development of a one–dimensional stream water quality model for the continuous simulation of suspended sediment transport and deposition processes along a particular stream section. The model integrates stream hydraulics and suspended sediment transport and deposition processes. The stream hydraulic model was developed using the Muskingum–Cunge method of channel routing. ...
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Influence of wave and current flow on sediment-carrying capacity and sediment flux at the water–sediment interface
In nearshore waters, spatial and temporal scales of waves, tidal currents, and circulation patterns vary greatly. It is, therefore, difficult to combine these factors’ effects when trying to predict sediment transport processes. This paper proposes the concept of significant wave velocity, which combines the effects of waves, tides, and ocean currents using the horizontal kinetic energy ...
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Prediction of non-cohesive sediment transport in circular channels in deposition and limit of deposition states using SVM
Sedimentation in sewer pipes has a negative impact on the performance of sewerage systems. However, due to the complex nature of sedimentation, determining the governing equations is difficult and the results of the available classic models for computing bedload transport rate often differ from each other. This paper focuses on the capability of a support vector machine (SVM) as a meta-model ...
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River flow and sediment transport simulation based on a curvilinear and rectilinear grid modelling approach – a comparison study
In the present work, a two-dimensional (2D) hydraulic model was used for the simulation of river flow and sediment transport in the downstream section of the Koiliaris River Basin in Crete, Greece, based on two different structured grids. Specifically, an important goal of the present study was the comparison of a curvilinear grid model with a rectilinear grid model. The MIKE 21C model has ...
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The use of plastic media in a movable bed model to study sedimentary processes in rivers
The use of plastic media was evaluated for modelling sedimentary processes in rivers using a movable bed model (MBM). From gradations within the range of 0.17–2 mm, the size of the thermoset plastic media was colour coded in order to better visualise complex flow processes. Equations developed by Engelund–Hansen and Schoklitsch were used to predict sediment transport and establish the type of bed ...
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Modelling the erosive effects of sewer flushing using different sediment transport formulae
A numerical investigation to simulate the cleaning effects of successive flushes over sediment beds in prismatic channels is presented in this paper. The 1D De Saint Venant-Exner equations were used to describe the temporal evolution of the sediment bed after each flush. The predictive capacity of two sediment transport formulae was explored against experimental results from laboratory tests. ...
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A nonlinear simulation method based on a combination of multilayer perceptron and decision trees for predicting non-deposition sediment transport
This article presents a fast and powerful new hybrid decision tree (DT) method based on multilayer perceptron neural networks (MLP-NN) to determine the limiting velocity in sediment transport for preventing solid matter deposition. The parameters with the greatest influence on limiting-velocity prediction are exploited from the literature in order to present the MLP-DT-based model in this ...
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An expert system with radial basis function neural network based on decision trees for predicting sediment transport in sewers
In this study, an expert system with a radial basis function neural network (RBF-NN) based on decision trees (DT) is designed to predict sediment transport in sewer pipes at the limit of deposition. First, sensitivity analysis is carried out to investigate the effect of each parameter on predicting the densimetric Froude number (Fr). The results indicate that utilizing the ratio of the median ...
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A support vector regression-firefly algorithm-based model for limiting velocity prediction in sewer pipes
Sediment transport without deposition is an essential consideration in the optimum design of sewer pipes. In this study, a novel method based on a combination of support vector regression (SVR) and the firefly algorithm (FFA) is proposed to predict the minimum velocity required to avoid sediment settling in pipe channels, which is expressed as the densimetric Froude number (Fr). The ...
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Pollution wash-off modelling on impervious surfaces: calibration, validation, transposition
ABSTRACTThis paper presents the modification and the application of the conceptual wash-off model initially proposed by the SWMM on five separate urban catchments with very different characteristics and during a lot of rainfall events. To allow measurements on real sites to be considered, this model was incorporated in an overall model including simulation build-up, sediment transport in ...
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Sediment Budget Template applied to Aberdeen Pool
This work creates a Sediment Budget Template (SBT) with Aberdeen Pool on the Tennessee-Tombigbee Waterway as the demonstration site. USGS data are the basis for the Power Curve Program which defines the sediment behaviour in terms of a power function. The second program, Tier 1 Program, uses the power curve coefficients along with the bankfull discharge to define the sediment fluxes. Thirdly, the ...
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Regionalization of sediment rating curve for sediment yield prediction in ungauged catchments
The main objective of this research is to regionalize the sediment rating curve (SRC) for subsequent sediment yield prediction in ungauged catchments (UCs) in the Lower Mekong Basin. Firstly, a power function-based SRC was fitted for 17 catchments located in different parts of the basin. According to physical characteristics of the fitted SRCs, the sediment amount observed at the catchment ...
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Braided rivers: structure, types and hydrological effects
Braided rivers have been intensively analyzed mostly by geomorphologists. In the present study the approach to recognize braided channel types and effects with the special emphasis on flow partitioning has been applied. It is assumed that each braided channel represents the reach which is initiated with dividing of the single channel and completed below the confluence of the total multiplicity ...
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