Dongfang 8 inch water injection dredger to pump sand

Water Injection Dredging is a technique in which a specially developed Water Injection Dredger injects large volumes of water at a low pressure into the sediment, using pumps with a series of nozzles on a horizontal jetbar.
This fluidises the sediment by effectively overcoming the cohesion in fine-grained (cohesive) soils or internal friction of coarse-grained (granular) soils.
This fluidised sediment then remains close to the river or channel bed, flowing down to deeper areas.
Fluidised 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.
Staying close to the bed creates a density current that then, either by the force of gravity or through a natural or artificially created slope, flows downwards to deeper water.
This all occurs with a minimum of disturbance to the equilibrium of the ecosystem. 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.