![]() In this way, instead of mechanical transportation, nature takes care of the sediment transport, making water injection dredging under certain conditions a very cost-efficient dredging technique. This process occurs with a minimum of disturbance to the equilibrium of the ecosystem. The aim of water injection dredging is to keep sediment out of the water column, moving material horizontally in the lower part of the waterway and restricting it to the vicinity of the seabed. With water injection dredging, sediments are not raised from the surface of the water and therefore no disposal takes place. Water injection dredging is a cost-effective, environmentally sound solution to some specific dredging operations. This fluidised sediment or slurry remains close to the river or channel bed, and through the slope of the seabed and water currents pulled by gravity flows down to deeper areas.įluidised soil is also sometimes referred to as fluid mud, fluid bed or density cloud, but since the sediment remains just above the bed, the term “fluidised soil layer” is generally agreed to be a more apt description. A density current is the fluidised soil layer “on the move”. ![]() This fluidises the sediment by effectively overcoming the cohesion in fine-grained, cohesive soils or the internal friction of coarse-grained, granular soils.īy fluidising the solid sediment layer into a density current, the material, under certain circumstances will flow out of the port basin. This is a specially developed vessel that uses pumps with a series of nozzles on a horizontal jetbar to spray water at a low pressure into the waterbed.
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