Author(s): Luis Ayala
Linked Author(s):
Keywords: No Keywords
Abstract: Laboratory tests carried out under conditions of high Froude Number flows over graded coarse sediment beds, provide information which is used to verify and make applicable to mountain streams existing methods for flow resistance, pavement coat size distribution and bedload rate prediction. It is shown that a logarithmic type hydraulic relation fits the experimental data if D_p50 of the pavement layer is used as representative grain diameter. On the other hand, making use of GesslerTmethod the pavement size distribution is predicted assuming that the probability for bed sediments of a given size to remain on the bed surface is Lognormal distributed. Finally, bedload predictors are reviewed and analyzed by comparing theoretical results with the laboratory data obtained in the present study. These comparisons enable to introduce in the methods hiding factors with which a better prediction can be attained for coarse sediment.
Year: 1993