. Collected reprints / Atlantic Oceanographic and Meteorological Laboratories [and] Pacific Oceanographic Laboratories. Oceanography 6o4 W. L. Stubblefield, R. W. Permenter & P. Swift Grab sampling in the vicinity of the sewage sludge dumpsite reveals only clean sand. Bottom photographs taken in the adjacent Christiaensen Basin [Plate V (d)] reveal in some areas a 'fluff' of comminuted organic material resting on the bottom. Such a 'fluff' would escape the grab sampler. The material may consist of the coarser portion of sewage sludge. However, such dark organic fluffs m
. Collected reprints / Atlantic Oceanographic and Meteorological Laboratories [and] Pacific Oceanographic Laboratories. Oceanography 6o4 W. L. Stubblefield, R. W. Permenter & P. Swift Grab sampling in the vicinity of the sewage sludge dumpsite reveals only clean sand. Bottom photographs taken in the adjacent Christiaensen Basin [Plate V (d)] reveal in some areas a 'fluff' of comminuted organic material resting on the bottom. Such a 'fluff' would escape the grab sampler. The material may consist of the coarser portion of sewage sludge. However, such dark organic fluffs may occur naturally on quiet bottoms, > Temporal distribution Repeated grab sampling and sidescan sonar examination of the two transects reveals a remark- able degree of bottom stability. In general, it appears that the bottom is in a state of textural equilibrium with the hydraulic climate. The envelopes of grain size transects in Figures 4 and 40»35' 40''3tf 40''25'. 74"»00' 73»55' 73050' 73''45 Figure 6. Location map for figures presented in this paper. 5 show no systematic seasonal variation, and their spread appears to be due primarily to small positioning areas. The banded bottoms revealed by sidescan sonar are in general quite stable. A broad band of coarse sand or sandy gravel near the Long Island shore underwent no visible change during the year of observation (Plate VI; Figure 5, 8-5 km). Other areas have undergone minor change. We have particularly good control of bottom changes in the patchy texture east of the dredge spoil dumpsite because the transect passes over a wreck which appears in successive sidescan records. Changes in the shape of bottom sediment patches were observed in the year of observation (Plate VII). At the very northern end of the north-south transect a series of light and dark bands increased in number (Plate VIII). W. Harris of Brooklyn College has independently sampled nearshore portions of the north- south transect during 1974 and 19
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