Journal of Engineering and Applied Sciences
ISSN: Online 1818-7803ISSN: Print 1816-949x
Abstract
Groynes are ban impressive engineered methods that used to diverge the flow away from the banks to protect them from erosion, control the flood situations, improve the navigation and also decrease rivers dredging costs, since, their presence will regulate and increase the sediments transport rate through the river reach at the groynes location. In spite of the many advantages for construction the groynes but their presence lead to develop the local scour phenomena which in time cause a structural failure to the groynes body. This issue presents a need to find solutions that have the ability to lessen the scour process along with maintaining all the above benefits of the groynes. The present study introduced a creative solution which is using groynes having a C-shape that have the ability to reduce the scour around themselves through smoothing the water streamlines paths as much as possible to cause little disturbance and hence, less scour. Also the C-shape groynes are compared with the I-shape groynes. The number of groynes is studied also as a countermeasure for more reducing to the local scour phenomena. The study was performed through a laboratory flume with bed material having a median size (d50) equal to (0.7 mm). A polystyrene foam material was used to manufacture the physical models where they investigated under clear water conditions and steady subcritical flow. The results showed that using the C-shape groynes instead of the I-shape groynes for the same hydraulic conditions will reduce the maximum local scour depth with a great percentage. Based on the experimental data, an empirical formula that give good agreement between the observed results experimentally and the predicted ones from it were derived.
How to cite this article:
Saleh I. Khassaf and Hiba A. Abbas. Scouring Around Impermeable Curved Groynes.
DOI: https://doi.org/10.36478/jeasci.2019.5241.5249
URL: https://www.makhillpublications.co/view-article/1816-949x/jeasci.2019.5241.5249