Author(s): H. Hayashida; Y. Muto; T. Tamura; S. Tazoe
Linked Author(s): Yasunori Muto
Keywords: Spur dykes; Longitudinal dykes; Experiment; Scour and deposition; Embayment
Abstract: Laboratory experiments regarding the design of spur dykes with longitudinal dykes were conducted in a straight flume with a movable bed. 3 types of the longitudinal dykes were considered, extending only upstream (LU-shape), only downstream (LD-shape) and toward both directions (T-shape), in addition to no longitudinal dyke (I-shape). 10 sets of spur dykes were installed only on one side of the flume, and 2 depth conditions were explored, i.e. non-submerged and submerged ones. Surface flow patterns and equilibrium bed configurations were measured. The results show that amount of deposition in the embayment fairly differs according to the shape and length of the longitudinal dykes. This sediment deposition also induces geometric diversity in the embayments. Among the tested types, LU-shape (only upstream) dykes captures sediments most effectively for both non-submerged and submerged cases.
Year: 2014