Abstract
The longitudinal dispersion coefficient, D sub L, is evaluated on the basis of a one-dimensional analysis as affected by large bed roughness in a laboratory flume. The experimental results have shown that the dimensionless dispersion coefficient, D sub L/Yu*, in which Y is the water depth and u* is the bed shear velocity, is a function of the relative roughness height, Y/h, and the relative roughness spacing, X/Y. It is also found that D sub L/Yu* reaches a maximum value at a roughness density h/X = 0.111. The commonly used equation for estimating the longitudinal dispersion coefficient (D sub L = C Yu*) is also examined. It is found that this straight line relation between D sub L and Yu* is no longer valid of Yu* greater than 0.1 sq ft per sec (0.009 m sq/s).
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