Author(s): Katherine Heays
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Abstract: The evolution and equilibrium dimensions of scour holes downstream of bed sills were investigated under different flow rates and sediment supply. Seven experiments were conducted in The University of Auckland Hydraulics Laboratory using well sorted gravel on a sloping bed. The objectives of these experiments were; to determine the effect of an upstream sediment supply on equilibrium scour dimensions, to compare the results obtained with the predicted values obtained using the formulae developed by previous authors, and to develop a general relationship for maximum scour depth using the results from the present experiments combined with other published data. This investigation found there was a large variation between the various predictive formulae, indicating a need for a general formula. Using regression analysis a general formula was developed, however there still remains significant scatter in the results. This study found the presence of an upstream sediment supply does not significantly affect the maximum scour depth.
Year: 2009