Modelling of Solids Distribution in Sediment Laden Open Channel Flow: Laboratory Validation

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21110%2F22%3A00358371" target="_blank" >RIV/68407700:21110/22:00358371 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.3850/IAHR-39WC2521711920221037" target="_blank" >http://dx.doi.org/10.3850/IAHR-39WC2521711920221037</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.3850/IAHR-39WC2521711920221037" target="_blank" >10.3850/IAHR-39WC2521711920221037</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Modelling of Solids Distribution in Sediment Laden Open Channel Flow: Laboratory Validation

Popis výsledku v původním jazyce

Steady uniform open-channel flow with intense transport of combined load (suspended load and contact load) above plane mobile bed is modelled using a new developed transport model based on the kinetic theory of granular flow. The model is an extension of the recently developed model for collisional transport and the new model employs the mixing-length concept to incorporate a contribution of flow turbulence in supporting transported sediment particles additional to the dominating support contribution by interparticle contacts. The model predicts flow rates of water and sediment for a given combination of the channel depth and longitudinal slope and includes predictions of the solids distribution and flow velocity across the flow depth. Validation experiments with lightweight sediment in a laboratory tilting flume provide results for a comparison with new model predictions. The experiments include measurements of the distribution of the local sediment concentration using the camera-based laser stripe technique and measurements of the distribution of velocity of solids using the imaging technique based on Particle Tracking Velocimetry with two synchronized high-speed cameras. Furthermore, local velocities of water are obtained from Pitot-tube measurements. The paper presents results of the transport model and their comparison with results of the laboratory experiment for a relatively broad range of bed shear conditions (Shields parameter between 0.8 and 1.8 approximately). A discussion includes criteria and conditions for the local support of particles by turbulent eddies in the transport layer of the flow transporting combined load.

Název v anglickém jazyce

Modelling of Solids Distribution in Sediment Laden Open Channel Flow: Laboratory Validation

Popis výsledku anglicky

Steady uniform open-channel flow with intense transport of combined load (suspended load and contact load) above plane mobile bed is modelled using a new developed transport model based on the kinetic theory of granular flow. The model is an extension of the recently developed model for collisional transport and the new model employs the mixing-length concept to incorporate a contribution of flow turbulence in supporting transported sediment particles additional to the dominating support contribution by interparticle contacts. The model predicts flow rates of water and sediment for a given combination of the channel depth and longitudinal slope and includes predictions of the solids distribution and flow velocity across the flow depth. Validation experiments with lightweight sediment in a laboratory tilting flume provide results for a comparison with new model predictions. The experiments include measurements of the distribution of the local sediment concentration using the camera-based laser stripe technique and measurements of the distribution of velocity of solids using the imaging technique based on Particle Tracking Velocimetry with two synchronized high-speed cameras. Furthermore, local velocities of water are obtained from Pitot-tube measurements. The paper presents results of the transport model and their comparison with results of the laboratory experiment for a relatively broad range of bed shear conditions (Shields parameter between 0.8 and 1.8 approximately). A discussion includes criteria and conditions for the local support of particles by turbulent eddies in the transport layer of the flow transporting combined load.

Druh

D - Stať ve sborníku

CEP obor

—

OECD FORD obor

20101 - Civil engineering

Projekt

<a href="/cs/project/GA19-18411S" target="_blank" >GA19-18411S: Modelování intenzivního chodu směsi dnových a nesených splavenin</a><br>

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Rok uplatnění

2022

Kód důvěrnosti údajů

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Název statě ve sborníku

Proceedings of the 39th IAHR World Congress

ISBN

—

ISSN

2521-7119

e-ISSN

2521-7119

Počet stran výsledku

8

Strana od-do

616-623

Název nakladatele

Universidad de Granada

Místo vydání

Granada

Místo konání akce

Granada, Spain

Datum konání akce

19. 6. 2022

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

001070410600112