Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
Eine Plattform für die Wissenschaft: Bauingenieurwesen, Architektur und Urbanistik
In free-surface flow, the component of the weight of water in the downstream direction causes acceleration of flow, whereas the shear stress at the channel bottom and sides offers resistance to flow. Depending upon the relative magnitude of the accelerating and decelerating forces, the flow may accelerate or decelerate. Flow in which the flow depth does not change with distance is called uniform flow and its corresponding flow depth is called the normal depth.
In this chapter, uniform flow and normal depth are discussed. Equations relating the bottom shear stress to different flow variables are first derived using common resistance equations, such as Chezy equation, Manning equation, and Strickler equation. Then, typical values for the Manning coefficients are presented. A number of procedures for computing the normal depth in a given channel for a specified discharge are discussed. Estimating the normal depth in compound channel cross section and the use of equivalent Manning constant are outlined. The chapter concludes by deriving expressions for the energy coefficient and for the slope of the energy grade line in a compound channel section.
In free-surface flow, the component of the weight of water in the downstream direction causes acceleration of flow, whereas the shear stress at the channel bottom and sides offers resistance to flow. Depending upon the relative magnitude of the accelerating and decelerating forces, the flow may accelerate or decelerate. Flow in which the flow depth does not change with distance is called uniform flow and its corresponding flow depth is called the normal depth.
In this chapter, uniform flow and normal depth are discussed. Equations relating the bottom shear stress to different flow variables are first derived using common resistance equations, such as Chezy equation, Manning equation, and Strickler equation. Then, typical values for the Manning coefficients are presented. A number of procedures for computing the normal depth in a given channel for a specified discharge are discussed. Estimating the normal depth in compound channel cross section and the use of equivalent Manning constant are outlined. The chapter concludes by deriving expressions for the energy coefficient and for the slope of the energy grade line in a compound channel section.
UNIFORM FLOW
Chaudhry, M. Hanif (Autor:in)
Open-Channel Flow ; Kapitel: 4 ; 93-123
01.01.2022
31 pages
Aufsatz/Kapitel (Buch)
Elektronische Ressource
Englisch
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