(a) four sizes of riverbed material
(b) three sizes of rivers
Figure B.7. Plotting V*/ωi and f(V*/ωi) for data from Group 1 with Laursen's Equation.
Accordingly, the validity of the assumption that total discharge for a given particle size can be
determined by the proposed parameters is questionable. Lane (1955) and Bagnold (1966)
first proposed the concept that stream power has a strong correlation which bed material
discharge. Yang (1996) identified stream power, τV, as an independent variable with a strong
correlation with bed material discharge. Furthermore, Yang suggested that unit stream
power, VS, has a stronger relationship to bed-material discharge than stream power. Other
researchers suggested that the stream power relations could be utilized in straight channels
as well as channels that are in the process of changing their patterns from straight to
meandering or braiding (Yang 1977 and 1996) (Vanoni 1978) (Yang and Molinas 1982). It is
important to note that dimensionless unit stream power, VS/ω, further improved the
correlation with bed material discharge (Yang and Kong 1991). Kodoatie et al. 1999 verified
that VS/ω has a stronger correlation with bed-material discharge than other stream power
parameters.
B.23
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