Title: A Simple Model of Turbulence Intensity and Turbulence Scale Distribution in Gravel Bed Rivers
Abstract: Turbulence intensity is a simple and widely investigated river turbulence characteristic. It is often used in both basic research and practical applications. Many researchers have tried to find some universal functions for describing its vertical distribution in open channel flows. In most cases the attempts were empirical (Grinvald, 1974; Iwasa and Asano, 1980, among others). At the same time some semi-empirical models were developed by Nakagawa, Nezu, and Ueda (1975), Li, Schall, and Simons (1980), and Nezu and Nakagawa (1993). The latter derived their relationships on the basis of the K-ε turbulence model and an assumption that the turbulent energy is in local equilibrium (turbulence generation G = turbulence dissipation ε). Also, Nezu and Nakagawa (1993) recognize that the eddy viscosity vertical distribution in their model differs somewhat from the parabolic distribution that follows from the logarithmic velocity law.
Publication Year: 1996
Publication Date: 1996-01-01
Language: en
Type: book-chapter
Indexed In: ['crossref']
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Cited By Count: 1
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