LOCAL SCOUR AROUND T-SHAPE SUBMERGED GROYNES IN CLEARWATER CONDITIONS

Abstract

A series of failures due to bank erosion have rekindled our understanding of the scour
phenomena. One of the methods to improve the bank's protection against scour are river training structures,
such as submerged groynes, where installed in a river to relieve erosion in the outer bank in two consecutive
bends. Under clear water conditions, the maximum scour depth based on laboratory experiments around T-
shape submerged groynes was investigated, and the most parameters that reduce the scour around these
obstructions were also investigated. The result of T-shape submerged groynes showed that decreasing of scour
depth ratio due to the increasing submerged ratio, and the number of groynes. The scour hole geometry will
increase with the Froude number, flow intensity, and the spacing between groynes. A new empirical equation
was derived and showed a correlation between the predicted results with the observed experiments.