Explicit approximation for velocity and sediment flux above mobile sediment bed beneath current and asymmetric wave

2020 ◽  
Vol 157 ◽  
pp. 103635
Author(s):  
Xin Chen ◽  
Xinyu Hu
Keyword(s):  
Sediment Flux ◽  
Sediment Bed ◽  
Asymmetric Wave

scholarly journals The influence of turbulent bursting on sediment resuspension under fluvial unidirectional currents

2016 ◽  
Author(s):  
Sarik Salim ◽  
Charitha Pattiaratchi ◽  
Rafael Tinoco ◽  
Giovanni Coco ◽  
Yasha Hetzel ◽  
...  
Keyword(s):  
Critical Velocity ◽  
Sediment Resuspension ◽  
Three Dimensional ◽  
Sediment Concentration ◽  
Sediment Flux ◽  
Wall Turbulence ◽  
Experimental Conditions ◽  
Sediment Bed ◽  
Bursting Events

Abstract. Laboratory experiments were undertaken in a unidirectional current flume in order to examine the role of turbulence on incipient sediment motion. An acoustic Doppler velocimeter was used to measure the instantaneous three-dimensional velocity components and acoustic backscatter (related to suspended sediment concentration). The relationship between wall turbulence (in particular, the "bursting" phenomenon) and resuspension of a non-cohesive sediment bed was examined. The results within a range above and below the measured critical velocity suggested that: 1) the contribution of turbulent bursting events remained identical in both experimental conditions; 2) ejection and sweep events contributed more to the total sediment flux than up-acceleration and down-deceleration events; and 3) wavelet transform revealed a correlation between the momentum and sediment flux in both test conditions. Such similarities in conditions above and below the measured critical velocity highlighted the need to re-evaluate the accuracy of a single time-averaged critical velocity for the initiation of sediment entrainment.

Sediment Flux and Trapping on the Skagit Tidal Flats: Analysis and Modeling

2010 ◽  
Author(s):  
David K. Ralston ◽  
W. R. Geyer ◽  
Peter Traykovski
Keyword(s):  
Tidal Flats ◽  
Sediment Flux

Sediment Flux to the Coastal Zone: Predictions for the Navy

2001 ◽  
Author(s):  
James P. Syvitski ◽  
Charles J. Vorosmarty
Keyword(s):  
Coastal Zone ◽  
Sediment Flux

Design options for self-cleansing storm sewers

1996 ◽  
Vol 33 (9) ◽  
pp. 215-220 ◽  
Author(s):  
Chandramouli Nalluri ◽  
Aminuddin Ab. Ghani
Keyword(s):  
Cohesive Sediments ◽  
Stress Criterion ◽  
Sediment Bed ◽  
Sediment Size ◽  
Codes Of Practice ◽  
Design Charts ◽  
Design Options ◽  
Minimum Velocity ◽  
Limited Depth ◽  
Storm Sewers

A list of available codes of practice for self-cleansing sewers is presented and a review of appraisals of minimum velocity criterion is summarised. Comparisons of newly developed “minimum velocity” criteria and “minimum shear stress” criterion are presented. Some design charts are also given. These charts are applicable to non-cohesive sediments (typically storm sewers). It appears that sediment size and concentration need to be taken into account, and that a limited depth of sediment bed is recommended for large pipes (diameters > 1000 mm) to maximise their transport capacity.

scholarly journals Prestress-controlled asymmetric wave propagation and reciprocity-breaking in tensegrity metastructure

2020 ◽  
Vol 37 ◽  
pp. 100724 ◽  
Author(s):  
Yitian Wang ◽  
Weijia Zhao ◽  
Julian J. Rimoli ◽  
Rui Zhu ◽  
Gengkai Hu
Keyword(s):  
Wave Propagation ◽  
Asymmetric Wave

An Experimental Study on the Transport of Sediment in Sewer Pipes with a Permanent Deposit

1992 ◽  
Vol 25 (8) ◽  
pp. 115-122 ◽  
Author(s):  
G. S. Perrusquía
Keyword(s):  
Experimental Study ◽  
Critical Shear Stress ◽  
Side Wall ◽  
Bedload Transport ◽  
Flow Conditions ◽  
Sewer Pipes ◽  
Sediment Bed ◽  
Concrete Pipe ◽  
Geometric Factors ◽  
Particle Parameters

An experimental study of the transport of sediment in a part-full pipe was carried out in a concrete pipe. The experiments were confined to bedload transport. The purpose of this study was to analyze the flow conditions that characterize the stream traction in pipe channels and their relationship to flow resistance and sediment transport rate. Three procedures used in this kind of experimental study were tested and found valid: 1) the vertical velocity distribution near the sediment bed can be described by the velocity-defect law, 2) the side wall elimination procedure can be used to compute the hydraulic radius of the sediment bed, and 3) the critical shear stress of the sediment particles can be obtained by using Shields' diagram. A relationship to estimate bedload transport, based on dimensional analysis, was proposed. This was expressed in terms of both flow and particle parameters as well as geometric factors. Further experimental work is recommended before this relationship can be fully incorporated in a simulation model for the analysis of storm sewers.

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