Modeling cap placement at New York Mud Dump site
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abstract
Dioxin contaminated dredged material was placed in the southwest section of the New York Mud Dump disposal site in a water depth of approximately 25 m (80 ft) and capped with 1 m (3.3 ft) of clean medium sand. The objective of this paper is to discuss the modeling of the capping operation. The short term fate model STFATE was modified to simulate the several capping scenarios and used to evaluate spacing between vessel tracks, width and thickness of coverage for each pass and effects of vessel speed and time of discharge. In the case of a hopper barge, it is shown that the optimum disposal technique is to discharge the cap material through two pumpdown discharge pipes located on each side of the vessel with the flow directed in the same direction (counter flow) as the vessel motion. For a smaller capacity split-hull hopper dredge, constraining the cracked hull opening to 0.305 m (1 ft) produced the optimal disposal method.
