Search results for "meander"
showing 8 items of 38 documents
Flow-bed interactions analysis and application of automatic close range digital photogrammetric survey in a laboratory flume
2014
This paper reports on a laboratory study in which the automatic digital photogrammetric survey was applied to derive the high-resolution Digital Surface Model (DSM) of the bed topography, used for the flow-bed interactions analysis, in a large amplitude meandering laboratory flume. The analysis has been conducted with the aid of detailed data of three-dimensional flow field previously collected using the acoustic Doppler velocity profiler DOP2000. The applied surveying procedure has allowed the evaluation of the DSM with a resolution of ±0.5 mm. The detailed DSM has been compared with peculiar maps describing the flow velocity pattern (downstream and the crossstream flows) and the shear vel…
Cross-sectional flow and velocity redistribution in a meandering laboratory flume
2015
The role played by the cross-stream circulation could be important in the longitudinal flow velocity and bed shear stress redistributions, which determine the bed topography (Blanckaert et al., 2008). Recent experimental results obtained in a strongly curved channel (Blanckaert and Graf, 2001) and in a large amplitude meandering flume (Termini and Piraino, 2011) have highlighted that, besides the main central-region cell, a counter-rotating secondary circulation cell forms near the outer bank along the curved reaches of the channel. In this context, the present work aims at improving the understanding of the flow characteristics along a meandering bend. The analysis is based on detailed vel…
Numerical simulation of bed topography in large meadering channels
2002
Experimental investigation of flow turbulent structure in a high-amplitude vegetated meandering laboratory flume
2018
The present work focuses on high-curved channels which are characterized by a complex flow turbulent structure. The specific aim of work is to analyze the evolution of turbulent coherent motion in the pres-ence of vegetation on the bed.
Entropic model application to identify cross-sectional flow effect on velocity distribution in a large amplitude meandering channel
2020
Abstract Literature shows the application of the entropy concept in open channels flow. No existing research has been addressed to the application of the entropy concept for evaluating the effect of secondary flow which especially develops in curved channels. The purpose of this paper is to explore the possibility to evaluate the effect of the secondary flow on the stream-wise velocity distribution starting only from the knowledge of the surface velocity and the entropic concept application. The analysis is conducted with the aid of data collected in a large-amplitude meandering laboratory flume for two different values of the width-to-depth ratio. Results show that the location of the maxi…