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- W2247660711 abstract "Abstract Validity of log-law distribution of velocity in vertical section for alluvial channel under different localized bed and flow conditions is studied in this paper. In this study a new dimensionless parameter, Hari’s Number (P h ), whose value is to be taken as Q/νh, is proposed to relate the same with numerical coefficients of log-law distribution. It was found that the values of numerical coefficients could satisfactorily be correlated to the proposed indicators P h . Value of Y (additive numerical coefficient) increases with increase in value of P h . At lower discharge and lower depth, the value of coefficient of determination is seen to decline, inferring that for lower P h values, the velocity distribution is more random. Keywords: Acoustic Doppler Velocimeter, Alluvial channel, Hari’s number, log-law distribution, Numerical coefficient *Author for Correspondence E-mail: haribit31@gmail.com INRODUCTION Rouse, Ince and Bray stated that one of the major problems in the field of hydraulics was ‘to estimate the velocity of river’ [1, 2]. For a small-scale roughness (the uniform flow depth is much higher than characteristic size of bed particles)condition and a two dimensional open channel flow [3–6], in the fully turbulent part of the inner region and in the outer region, the velocity profile can be described by the following logarithmic distribution given in Eq. (1). (1) where ‘v’ is the local velocity, u* is the shear velocity, z being the relative depth, X and Y are numerical coefficients based on experimental observations. Estimate of u* was obtained by taking the maximum value from the u'w' as stated by Steffler [5]. Bathurst’s for large relative roughness(R/d" @default.
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- W2247660711 date "2013-09-24" @default.
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- W2247660711 title "Introduction of New Flow Resistance Parameter for the Study Coefficients of Vertical Velocity Distribution" @default.
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