<abstract xmlns="http://www.w3.org/1999/xhtml"><p>Gravity-driven open-channel flows carrying coarse sediment over an erodible granular deposit are studied. Results of laboratory experiments with artificial sediments in a rectangular tilting flume are described and analyzed. Besides integral quantities such as flow rate of mixture, transport concentration of sediment and hydraulic gradient, the experiments include measurements of the one-dimensional velocity distribution across the flow. A vertical profile of the longitudinal component of local velocity is measured across the vertical axis of symmetry of a flume cross section using three independent measuring methods. Due to strong flow stratification, the velocity profile covers regions of very different local concentrations of sediment from virtually zero concentration to the maximum concentration of bed packing. The layered character of the flow results in a velocity distribution which tends to be different in the transport layer above the bed and in the sediment-free region between the top of the transport layer and the water surface. Velocity profiles and integral flow quantities are analyzed with the aim of evaluating the layered structure of the flow and identifying interfaces in the flow with a developed transport layer above the upper plane bed.</p></abstract>

Gravity-driven open-channel flows carrying coarse sediment over an erodible granular deposit are studied. Results of laboratory experiments with artificial sediments in a rectangular tilting flume are described and analyzed. Besides integral quantities such as flow rate of mixture, transport concentration of sediment and hydraulic gradient, the experiments include measurements of the one-dimensional velocity distribution across the flow. A vertical profile of the longitudinal component of local velocity is measured across the vertical axis of symmetry of a flume cross section using three independent measuring methods. Due to strong flow stratification, the velocity profile covers regions of very different local concentrations of sediment from virtually zero concentration to the maximum concentration of bed packing. The layered character of the flow results in a velocity distribution which tends to be different in the transport layer above the bed and in the sediment-free region between the top of the transport layer and the water surface. Velocity profiles and integral flow quantities are analyzed with the aim of evaluating the layered structure of the flow and identifying interfaces in the flow with a developed transport layer above the upper plane bed.

Experimental investigation of internal structure of open-channel flow with intense transport of sediment

Czech Technical University in Prague, Faculty of Civil Engineering, Thákurova 7, 166 29 Prague 6, Czech Republic

Journal of Hydrology and Hydromechanics

This chapter is distributed under the terms of the Creative Commons Attribution 4.0 Public License.

Gravity-driven open-channel flows carrying coarse sediment over an erodible granular deposit are studied. Results of laboratory experiments with artificial...

Experimental investigation of internal structure of open-channel flow with intense transport of sediment

Publié en ligne: 20 oct. 2015

Pages: 318 - 326

Reçu: 12 juin 2015

Accepté: 04 juil. 2015

DOI: https://doi.org/10.1515/johh-2015-0035

Mots clés
Acoustic anemometry, Plane bed, Solid-liquid flow, Tilting flume experiment

© 2015 Václav Matoušek et al., published by De Gruyter Open

This chapter is distributed under the terms of the Creative Commons Attribution 4.0 Public License.

Experimental investigation of internal structure of open-channel flow with intense transport of sediment

Publié en ligne: 20 oct. 2015

Pages: 318 - 326

Reçu: 12 juin 2015

Accepté: 04 juil. 2015

DOI: https://doi.org/10.1515/johh-2015-0035

Mots clésAcoustic anemometry, Plane bed, Solid-liquid flow, Tilting flume experiment

© 2015 Václav Matoušek et al., published by De Gruyter Open

This chapter is distributed under the terms of the Creative Commons Attribution 4.0 Public License.

Mots clés
Acoustic anemometry, Plane bed, Solid-liquid flow, Tilting flume experiment