Field evaluation of some sand transport models

1983 ◽  
Vol 8 (2) ◽  
pp. 101-114 ◽  
Author(s):  
Neil H. Berg
Keyword(s):  
Field Evaluation ◽  
Sand Transport ◽  
Transport Models

Pesticide soil transport models: Model comparisons and field evaluation

1993 ◽  
Vol 40 (1-4) ◽  
pp. 71-81 ◽  
Author(s):  
Marco Trevisan ◽  
Ettore Capri ◽  
Attilio A.M. Del Re
Keyword(s):  
Field Evaluation ◽  
Transport Models ◽  
Model Comparisons ◽  
Soil Transport

scholarly journals MATERIAL PLACEMENT IN THE NEARSHORE: LABORATORY AND NUMERICAL MODEL INVESTIGATION

2012 ◽  
Vol 1 (33) ◽  
pp. 126 ◽  
Author(s):  
Bradley D. Johnson ◽  
Ernest R. Smith
Keyword(s):  
Correction Factor ◽  
Surf Zone ◽  
Diffusion Mechanism ◽  
Disposal Site ◽  
Sand Transport ◽  
Advective Transport ◽  
Transport Models ◽  
Gradient Diffusion ◽  
Analytical Correction ◽  
Suspended Layer

Typical practice for a century has been to transport dredged sand to an offshore disposal site in deep water where the sediment is lost from the littoral system. The alternative of nearshore placement can retain the sand, but the fate of the material is poorly understood. A set of laboratory experiments were conducted, using tracer sand, with the intent of quantifying the migration of material with alternative dredged mound placements within the surf zone. Conventional depth-integrated tracer sand transport models can utilize a correction factor or a gradient diffusion mechanism to represent the effects of the depth variation. In the surf zone, however, an analytical correction factor is not available and a gradient diffusion coefficient is arbitrary with no physical basis. An alternative simple advective transport sand model is introduced herein that explicitly predicts both the advection associated with the return current and the wave-related onshore transport. With a simple framework based on a suspended layer and a bedload layer of arbitrary transport directions, the Taylor dispersion of tracer sand is explicitly computed without any dependence on a diffusion mechanism. Both the modeled and measured results indicate transport directed offshore by the undertow, onshore by the wave asymmetry, and down-drift as forced by the longshore current.

scholarly journals Validation of a Novel, Shear Reynolds Number Based Bed Load Transport Calculation Method for Mixed Sediments against Field Measurements

Water ◽  
2019 ◽  
Vol 11 (10) ◽  
pp. 2051 ◽  
Author(s):  
Gergely T. Török ◽  
János Józsa ◽  
Sándor Baranya
Keyword(s):  
Sediment Transport ◽  
Calculation Method ◽  
Field Measurements ◽  
Sand Transport ◽  
The Novel ◽  
Transport Models ◽  
Meaningful Improvement ◽  
Transport Calculation ◽  
Load Transport ◽  
Bed Material

In this study, the field measurement-based validation of a novel sediment transport calculation method is presented. River sections with complex bed topography and inhomogeneous bed material composition highlight the need for an improved sediment transport calculation method. The complexity of the morphodynamic features (spatially and temporally varied bed material) can result in the simultaneous appearance of the gravel and finer sand dominated sediment transport (e.g., parallel bed armoring and siltation) at different regions within a shorter river reach. For the improvement purpose of sediment transport calculation in such complex river beds, a novel sediment transport method was elaborated. The base concept of it was the combined use of two already existing empirical sediment transport models. The method was already validated against laboratory measurements. The major goal of this study was the verification of the novel method with a real river case study. The combining of the two sediment transport models was based on the implementation of a recently presented classification method of the locally dominant sediment transport nature (gravel or sand transport dominates). The results were compared with measured bed change maps. The verification clearly referred to the meaningful improvement in the sediment transport calculation by the novel manner in the case of spatially varying bed content.

Recalibrating aeolian sand transport models

2012 ◽  
Vol 38 (2) ◽  
pp. 169-178 ◽  
Author(s):  
Douglas J. Sherman ◽  
Bailiang Li ◽  
Jean T. Ellis ◽  
Eugene J. Farrell ◽  
Luis Parente Maia ◽  
...  
Keyword(s):  
Sand Transport ◽  
Aeolian Sand ◽  
Transport Models ◽  
Aeolian Sand Transport

A Novel Approach to Subsea Multiphase Solid Transport

2011 ◽  
Vol 367 ◽  
pp. 413-420
Author(s):  
Kelani Bello ◽  
Babs Mufutau Oyeneyin ◽  
Gbenga Folorunso Oluyemi
Keyword(s):  
Multiphase Flow ◽  
Flow Patterns ◽  
Sand Transport ◽  
Operational Parameters ◽  
Flow Loop ◽  
Transport Models ◽  
Horizontal Pipe ◽  
Main Challenge ◽  
Three Phase ◽  
Solid Transport

Transportation of multiphase reservoir fluid through subsea tiebacks has gained considerable attention in recent years especially in the deep offshore and ultra deep offshore environments where there is increasing pressure on the operators to reduce development costs without compromising oil production. However, the main challenge associated with this means of transporting unprocessed reservoir fluids is the need to guarantee flow assurance and optimise production. Solids entrained in the fluid may drop off and settle at the bottom of horizontal pipe thereby reducing the space available to flow and causing erosion and corrosion of the pipeline. The problem has been largely attributed to insufficient flow velocity among other parameters required to keep the solids in suspension and prevent them from depositing in the pipe. The continuous changing flow patterns have introduced additional complexities dependent on gas and liquid flow rates. Acquisition of experimental data for model development and validation in multiphase flow has been largely focused on single and two phase flow. This has impeded our understanding of the behaviour and associated problems of three phase or four phase (oil, water, gas and solid) in pipes. The result is inappropriate solid transport models for three phase and four phase. In order to bridge this gap, the Well Engineering Research group at Robert Gordon University has initiated a project on integrated multiphase flow management system underpinned by comprehensive experimental investigation of multiphase solids transport. The project is aimed at developing precise/accurate sand transport models and an appropriate design and process optimisation simulator for subsea tiebacks. In this paper, the physics of the multiphase transport models being developed is presented. The models will allow for the prediction of key design and operational parameters such as flow patterns, phase velocity, pressure gradient, critical transport velocity, drag & lift forces, flow rate requirements and tiebacks sizing for transient multiphase flow. A new multiphase flow loop is being developed which will be used to generate experimental database for building and validating the theoretical models for use in a proposed integrated simulator for deepwater applications.

scholarly journals COMPARISON OF SEDIMENT TRANSPORT MODELS WITH IN-SITU SAND FLUX MEASUREMENTS AND BEACH MORPHODYNAMIC EVOLUTION

2012 ◽  
Vol 1 (33) ◽  
pp. 19
Author(s):  
Adrien Cartier ◽  
Philippe Larroudé ◽  
Arnaud Héquette
Keyword(s):  
Sediment Transport ◽  
Mediterranean Coast ◽  
Sand Transport ◽  
Transport Models ◽  
In Situ Data ◽  
Flux Measurements ◽  
Coastal Sediment Transport ◽  
Set Up ◽  
Sand Flux

The aim of this study is to set up a procedure of linking of three codes to be able to simulate realistic coastal sediment transport and associated morphological change. In order to calibrate sediment transport formulae, comparisons of our simulations were carried out with in-situ data of sand transport measured on macrotidal beaches of northern France on the shore of the English Channel and Dover Strait. This technique of simulation was then used to compare and investigate the efficiency of several sediment transport models on the site of Sète (microtidal beach on the Mediterranean coast) during two storms events.

Research Progress of Sand Transport Mechanism and Critical Conditions in Pipelines

2020 ◽  
Author(s):  
YuanPeng You ◽  
LiMin He ◽  
Xiaoming Luo ◽  
KaiYue Shi ◽  
JianPeng Su
Keyword(s):  
Petroleum Industry ◽  
Research Progress ◽  
Critical Conditions ◽  
Sand Transport ◽  
Transport Models ◽  
Particle Properties ◽  
Fluid Properties ◽  
Sand Flow ◽  
Pattern Transformation ◽  
Sand Deposition

Abstract Sand deposition and transportation in pipelines has become one of the major concerns for flow assurance in petroleum industry. However, research in this field is still in its infancy. This study describes the current development of sand deposition and sand transport in pipeline. The mechanism of particles deposition is described. The effects of particle properties, fluid properties and pipeline structure on the carrying capacity of single-phase and multiphase flow carrying sand are introduced, with emphasis on factors such as particle size, liquid viscosity, flow regime and pipeline inclination. As for modeling studies, the sand transport models can be classified to three categories based on the approach used to develop them: empirical, mechanistic, and semi-mechanistic. The methods for developing and extending models are illustrated in this study. Based on the experimental data, the prediction accuracy of four multiphase models for critical velocity in stratified flow is verified. Further researches should focus on the mechanisms and the establishment of the accurate model for sand flow pattern transformation boundary.

Intercomparison of research and practical sand transport models

2002 ◽  
Vol 46 (1) ◽  
pp. 1-23 ◽  
Author(s):  
A.G Davies ◽  
L.C van Rijn ◽  
J.S Damgaard ◽  
J van de Graaff ◽  
J.S Ribberink
Keyword(s):  
Sand Transport ◽  
Transport Models
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