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Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
CRITICAL TRACTIVE STRESS IN STRAIGHT AND CURVED CHANNELS WITH NON-COHESIVE SOIL
Estimation of critical tractive stress in an open channel is important for finding bank stability and for the design of stable channels. It is also vitally needed for finding bed load transport. Shields' study is applicable for non-cohesive soil on flat surface. Lane made exhaustive study on critical tractive stress for both flat and inclined surfaces and contributed immensely for the design of stable channels. All these studies are, however, applicable for straight channels only. Starting from fundamentals, author has derived equations for critical tractive stresses both for straight and curved channels. It has been shown that the shear stress induced by secondary current in a typical curved channel e.g. in a meandering bend, reduces significantly the critical tractive stress on the outer side of bend. If the stress due to secondary current is very high due to strong flow curvature, critical tractive stress may vanish and the outer bed and bank may cave in even with insignificant forward drag.
CRITICAL TRACTIVE STRESS IN STRAIGHT AND CURVED CHANNELS WITH NON-COHESIVE SOIL
Estimation of critical tractive stress in an open channel is important for finding bank stability and for the design of stable channels. It is also vitally needed for finding bed load transport. Shields' study is applicable for non-cohesive soil on flat surface. Lane made exhaustive study on critical tractive stress for both flat and inclined surfaces and contributed immensely for the design of stable channels. All these studies are, however, applicable for straight channels only. Starting from fundamentals, author has derived equations for critical tractive stresses both for straight and curved channels. It has been shown that the shear stress induced by secondary current in a typical curved channel e.g. in a meandering bend, reduces significantly the critical tractive stress on the outer side of bend. If the stress due to secondary current is very high due to strong flow curvature, critical tractive stress may vanish and the outer bed and bank may cave in even with insignificant forward drag.
CRITICAL TRACTIVE STRESS IN STRAIGHT AND CURVED CHANNELS WITH NON-COHESIVE SOIL
Mazumder, S. K. (Autor:in)
ISH Journal of Hydraulic Engineering ; 16 ; 38-46
01.01.2010
9 pages
Aufsatz (Zeitschrift)
Elektronische Ressource
Unbekannt
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