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You are here : eLibrary : IAHR World Congress Proceedings : 32nd Congress - Venice (2007) : THEME A: Engineering and Management of Fresh-water Systems : On the time of development of the bed of alluvial meandering streams
On the time of development of the bed of alluvial meandering streams
Author : Ana Maria Ferreira da Silva, Andrew D. Binns
A method for the quantitative evaluation of the time of bed development in alluvial meandering streams is sought. In agreement with the prevailing approach, it is assumed that the stream centreline follows a sine-generated curve; the banks are rigid. The flow is turbulent and sub-critical, and the width-to-depth ratio is “large”. The movable bed is flat at time t =0; at t =Tb, the bed reaches its equilibrium or developed state. With the aid of dimensional and physical considerations, an expression is proposed for the duration of bed development Tb. According to this expression, Tb is proportional to the square of the flow width B and inversely proportional to the channel-averaged bed-load rate. The proportionality factor is found to be a function of the initial deflection angle θ0 alone. The present efforts of the authors to reveal this function are outlined.
File Size : 400,905 bytes
File Type : Adobe Acrobat Document
Chapter : IAHR World Congress Proceedings
Category : 32nd Congress - Venice (2007)
Article : THEME A: Engineering and Management of Fresh-water Systems
Date Published : 01/07/2007
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