Désensablement d'un chenal de navigation en cul-de-sac par injection de débit d'eau

Dredging of sand of a cul-de-sac channel by water injection

Laboratoire de Constructions Hydrauliques, Ecole Polytechnique Fédérale de Lausanne, Suisse

Abstract

Most of the daily waste of the Genève Canton, in Switzerland, is transported by waterway along the Rhône river ; to the incineration plant. The barges are loaded in a cul-de-sac channel which is chronically silted up. Two or three annual dredgings are thus necessary to maintain a sufficient water depth for navigation. Three variants are studied to avoid solid transport inside the channel and to evacuate the sediment depositing : a water wall, a plunge jet and a surface discharge. The analysis of the silt up processes as well as the study of the variants' efficiency are based on laboratory tests with two models of the channel, at scale 1:25 and 1:10. A numerical model of the proposed solution confirms the feasibility of the system.