O&M Dredging Experience as Related to Channel Deepening for Coal Ports,
ARMY ENGINEER DISTRICT NORFOLK VA
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The Norfolk District, Corps of Engineers, has been involved in innovative channel design, dredging techniques, disposal operations, and environmental coordination which favorably impact on water quality. Innovative channel design for coal export shipping lanes will minimize dredging. The design will employ a computerized ship maneuvering simulator operated by the U.S. Maritime Association and their Computer Aided Operations Research Facility CAORF. A dredging demonstration with nationwide application in the removal of contaminated sediments is underway on the James River. The demonstration will document the advantages of dredging in a riverine system with different dredge heads a cutterhead and a dustpan head. Engineering studies indicate that a dustpan head will dredge at near in-place density and thereby reduce turbidity and disposal problems. The district, with the assistance of Federal and state environmental agencies, has made site specific studies to determine the propriety of seasonal dredging restrictions. In four cases the restrictions were found to be unnecessary.