A bed-load transport model for rough turbulent open-channel flows on plane beds

2006 ◽  
Vol 31 (7) ◽  
pp. 910-928 ◽  
Author(s):  
Athol D. Abrahams ◽  
Peng Gao
Keyword(s):  
Open Channel ◽  
Transport Model ◽  
Channel Flows ◽  
Bed Load ◽  
Open Channel Flows ◽  
Load Transport ◽  
Bed Load Transport

scholarly journals Evaluation of an acoustic Doppler technique for bed-load transport measurements in sand-bed Rivers

2018 ◽  
Vol 40 ◽  
pp. 02053 ◽  
Author(s):  
S. Conevski ◽  
A. Winterscheid ◽  
N. Ruther ◽  
M. Guerrero ◽  
C. Rennie
Keyword(s):  
Transport Model ◽  
Transport Rate ◽  
Qualitative Assessment ◽  
Bed Load ◽  
Apparent Velocity ◽  
Digital Cameras ◽  
Statistical Correlations ◽  
Hydraulic Conditions ◽  
Load Transport ◽  
Bed Load Transport

The bottom tracking (BT) feature of the acoustic Doppler current profilers (ADCP) have emerged as a promising technique in evaluating the bed load. Strong statistical correlations are reported between the ADCP BT velocity and the transport rate obtained by physical sampling or dune tracking; however, these relations are strictly site-specific and a local calibration is necessary. The direct physical sampling is very labor intensive and it is prone to high instrument uncertainty. The aim of this work is to develop a methodology for evaluating the bed load transport using commercial ADCPs without calibration with physical samples. Relatively long stationary measurements were performed in a sand-bed and sand gravel rivers, using three different ADCPs working at 3MHz, 1.2MHz and 0.6MHz. Simultaneously, bed load samples were collected with physical samplers, and the riverbed was closely observed with digital cameras mounted on the samplers. It is demonstrated that the kinematic transport model can yield a relatively good estimate of the transport rate by directly using filtered apparent velocity, the knowledge of the hydraulic conditions and instrument-related calibration coefficients. Additionally, the ADCP data can help in qualitative assessment of the physical sampling. Future investigation of the backscattering echo and further confirmation of the BT apparent velocity should be performed in laboratory-controlled conditions.

Physical and Mathematical Modeling of Solid-Liquid Flow at High Bed Shear in Steep Flume

2015 ◽  
Author(s):  
Václav Matoušek ◽  
Štěpán Zrostlík ◽  
Jan Krupička ◽  
Tomáš Picek ◽  
Vojtěch Bareš
Keyword(s):  
Mathematical Modeling ◽  
Flow Rate ◽  
Open Channel ◽  
Bed Load ◽  
Flow Depth ◽  
Load Transport ◽  
Bed Load Transport ◽  
Bed Slope ◽  
Solid Liquid ◽  
Bed Friction

The paper discusses new results of our experimental- and mathematical modeling of sediment-laden open-channel flows in the upper plane bed regime associated with intense transport of sediment. Our recent studies showed that bed-load transport and bed friction are interrelated and classical formulae for bed friction (Nikuradse formula) and bed-load transport (Meyer-Peter and Muller formula) need to be modified to account for the intense transport of sediment. The new results of our laboratory experiments in a tilting flume are presented and analyzed for different sediment fractions. The analysis is focused on the effect of solids density and size on the solid-liquid flow characteristics as the solids flow rate, flow depth, and bed slope for certain flow rate of water in a channel of given geometry. The experimental results are compared with outputs of our mathematical model simulating the observed phenomena. The simple 1-D model combines hydrodynamic- and sediment-transport equations and enables to use different transport- and friction formulae to predict the solids transport, flow depth and bed slope under the condition of (pseudo-) uniform flow of solid-water mixture in the open channel.

scholarly journals A Sediment Transport Model for Straight Alluvial Channels

1976 ◽  
Vol 7 (5) ◽  
pp. 293-306 ◽  
Author(s):  
Frank Engelund ◽  
Jørgen Fredsøe
Keyword(s):  
Sediment Transport ◽  
Transport Model ◽  
Suspended Load ◽  
Empirical Models ◽  
Bed Load ◽  
Alluvial Channels ◽  
Physical Processes ◽  
Sediment Transport Model ◽  
Load Transport ◽  
Bed Load Transport

The paper presents a simple mathematical model for sediment transport in straight alluvial channels. The model, which is based on physical ideas related to those introduced by Bagnold (1954), was originally developed in two steps, the first describing the bed load transport (Engelund 1975) and the second accounting for the suspended load (Fredsøe and Engelund 1976). The model is assumed to have two advantages as compared with empirical models, first it is based on a description of physical processes, secondly it gives some information about the quantity and size of the sand particles in suspension and the bed particles.

scholarly journals BED-LOAD TRANSPORT AND BED VARIATION IN AN OPEN CHANNEL WITH MULTIPLE ROWS OF CYLINDERS

1999 ◽  
Vol 43 ◽  
pp. 1109-1114 ◽  
Author(s):  
Muneo HIRANO ◽  
Haruyuki HASHIMOTO ◽  
Junichirou TAMAMATSU ◽  
Kichan PARK ◽  
Takafumi HIBAKO
Keyword(s):  
Open Channel ◽  
Bed Load ◽  
Load Transport ◽  
Bed Load Transport
Sign in / Sign up

Export Citation Format

Share Document