Considering again the conditions specified in problem 15.10, recalculate the distances for the two assumed values for longitudinal dispersivity when there is no vertical mixing.
problem 15.10
A river has an initial suspended sediment concentration mo, at location x = 0, where x is the longitudinal coordinate. The river mean velocity is 0.7 m/s. Assuming that there is no resuspension and that the particles have an average settling speed of 10 m/day, calculate the distance downstream at which the average suspended concentration is one-half of mo. Compare the result when longitudinal dispersion is neglected and when it takes a value of 200 m2/s. In both cases it may be assumed that the particles are well mixed in the vertical direction.
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