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Determination of Friction Factor over a Pool Reach by Double-average Method

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TLDR
In this paper, a study was conducted in the Saymareh river in western Iran, where two reaches, with Froude number less than 1.0, were selected to investigate the contribution of the double-average method in determining friction factor.
Abstract
Bed-form characteristics have been investigated because of the close relation to hydraulic friction. Pool is one of the most important bed forms in coarse-bed rivers. The form friction factor should be considered in determining many river engineering projects including stable channel design, the scour depth along bank protection and at bridges piers. This study was conducted in the coarse-bed, Saymareh river, in western Iran. Two reaches, with Froude number less than 1.0, were selected to investigate the contribution of the double-average method in determining friction factor, one with pool bed form, range of Reynolds numberfrom 1.325×10

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Boundary layer theory

TL;DR: The flow laws of the actual flows at high Reynolds numbers differ considerably from those of the laminar flows treated in the preceding part, denoted as turbulence as discussed by the authors, and the actual flow is very different from that of the Poiseuille flow.
Journal ArticleDOI

A method of sampling coarse river‐bed material

TL;DR: In this paper, the size of material on the bed of a stream is determined based on an analysis of the relative area covered by particles of given sizes, which is applicable to those rivers which flow on coarse material and may be waded during periods of low water.
Journal ArticleDOI

Spatially averaged flow over a wavy surface

TL;DR: In this paper, velocity profiles obtained by averaging these flow data along lines of constant distance above the riverbed are examined, and it is shown that they can be constructed from well-known uniform flow results used in conjunction with a hypothesis about the structure of internal boundary layers.
Book

Fluvial Processes in River Engineering

TL;DR: The authors collects and collates the significant advances in analytical methods for alluvial channel design, river morphology, and mathematical simulation of river channel changes from an engineering point of view, and presents a complete analytical treatment of river morphology and its responses to environmental and human-made changes from the engineering perspective.
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