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Transport of fine particulates discharged at the 106-Mile Municipal Sewage Sludge Dumpsite
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1992
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Description:"The 106-Mile Municipal Sewage Sludge Dump Site (106-Mile Site) is located over the continental slope roughly 190 km east of the New Jersey coast. A critical issue regarding fine-grained sludge discharged at this site is whether or not it is carried to the shelf region in significant quantities. Numerous hydrographic sections and current meter data from recent field programs have shown that slope water, which typically occupies the 106-Mile Site, often intrudes into the shelf water mass in relatively thin layers at depths greater than 20 m. Using statistical models and current meter data from a number of large-scale field projects, it was found that a fraction of the material released at the 106-Mile Site may be transported to the shelf within the first 10 days after its discharge. In agreement with the hydrographic observations cited above, the onshelf flux of this material was found to be maximum between depths of 20-40 m during the summer season. However, points on the shelf are expected to be visited very infrequently by sludge within 10 days after its discharge from the 106-Mile Site: about 1 % of the time at the shelf edge and 0.01 % of the time 12 km shoreward. Furthermore, only a small fraction of the sludge released at the site, order l°/oo, is expected to reside over the shelf. Calculations have also shown that heavy metal concentrations in sludge from the 106-Mile Site should not be distinguishable from background concentrations at locations over the shelf and upper slope."
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Rights Information:Public Domain
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Compliance:Library
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