Review of Innovative Sediment Delivery Systems
CORPS OF ENGINEERS FORT SHAFTER HI HONOLULU ENGINEER DISTRICT
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Conventional sediment delivery methods used for beach nourishment or dredging projects typically fall into two categories 1 vehicular transport e.g., dump trucks, or 2 piped slurry transport systems. Truck hauling operations can transport wet or dry sediment from point to point, but often have problems accessing confined work areas. Trucks are often seen as disruptive to the general public and surroundings due to the continuous traffic and loud noises associated with construction vehicles. Damage resulting from the creation of access roads and from the continual heavy truck traffic often creates the need for significant site restoration after construction activities are complete. By contrast, pipeline systems transport the dredged sediment in the form of a sand-and-water mixture known as a slurry. The sediment fraction is usually on the order of 10 to 20 by weight of the slurry, which creates a significant dewatering issue at the discharge location. Recently developed sand transport and delivery methods use advanced air blowing techniques to convey the sediment through a pipeline system without the addition of water. Similarly, covered conveyor belt systems allow wet or dry sand to be transferred along narrow easements and to be discharged directly to the stockpile or placement area. Other technologies currently being developed, that are currently either not yet being fully employed or are being minimally used for sand transport, show great potential for effective use as sediment delivery systems. This RSM Technical Note describes the conventional state-of-the-art of beach sediment transport technology and reviews innovative sediment delivery systems presently under development. Information contained here is based on both a review of the technical literature and on direct input from private sector contractors and developers.
- Geology, Geochemistry and Mineralogy
- Surface Transportation and Equipment