Author(s): H. Zhang; H. Mizutani; H. Nakagawa
Linked Author(s):
Keywords: Groyne; Non-uniform sediment; Sediment size distribution; Local scour; Bed topography
Abstract: This paper presented an experimental study on the impact of grain size distribution on the bed topography around an impermeable groyne. The importance of two governing parameters, i.e. the mean grain size D and the geometric standard deviation σg, was emphasized with quantitative evidences. It was found in the current experiments that with the increase of D, the maximum local scour depth decreased and the slope of the scour hole increased for a sediment bed with a uniform grain size distribution. The maximum local scour depth in a non-uniform sediment bed was smaller compared with that in a uniform one and generally decreased with the increase of σg.
Year: 2011