. Collected reprints / Atlantic Oceanographic and Meteorological Laboratories [and] Pacific Oceanographic Laboratories. Oceanography 20 % TRANSPORT 0 5 J">VJV>W. ° n DAY 3 RIST DROP i—i—i—r 10 DAY 69. % TRANSPORT 0 10 % TRANSPORT 0 20 THRESHOLD VELOCITY =20 OCM/SEC ~r~~i—i—"i—r—i—i—r^—n—r—i—i—i—i—i—i—^^n—i—i-"i—i—i—i—'—i—i— 20 J DAY 22 i i 30 % TRANSPORT 0 20 40 "i—r 50 ~i 1 r 60 DAY 48 o 30 £ O 0 O FIGURE 3 5. Time sequence oj dispersal oj radioisotope- labeled sand, south shore of Long Island, April 22-July 2, 1974- (A) Background radioactivity in arbi
. Collected reprints / Atlantic Oceanographic and Meteorological Laboratories [and] Pacific Oceanographic Laboratories. Oceanography 20 % TRANSPORT 0 5 J">VJV>W. ° n DAY 3 RIST DROP i—i—i—r 10 DAY 69. % TRANSPORT 0 10 % TRANSPORT 0 20 THRESHOLD VELOCITY =20 OCM/SEC ~r~~i—i—"i—r—i—i—r^—n—r—i—i—i—i—i—i—^^n—i—i-"i—i—i—i—'—i—i— 20 J DAY 22 i i 30 % TRANSPORT 0 20 40 "i—r 50 ~i 1 r 60 DAY 48 o 30 £ O 0 O FIGURE 3 5. Time sequence oj dispersal oj radioisotope- labeled sand, south shore of Long Island, April 22-July 2, 1974- (A) Background radioactivity in arbitrary units. Heavy black line is line oj emplacement oj sand labeled with ruthenium-105. (B-F) Maximum extent oj detectable signal ajter removal oj background on successive mapping days. Data have been corrected jor decay. Bottom panel: time-velocity record {jagged line). Height oj vertical bars indicates percentage oj total bed load transported, as determined from a normalized sediment transport index, Vioo — Vr- Width oj vertical bars indicates duration oj transport event. Rose diagrams indicate direction oj transport. Length oj radial bar indicates percentage oj transport during that event; width is proportional to direc- tion and intensity. Velocity was sampled every 10 minutes. Unpublished data oj Lavelle et al., Atlantic Oceanographic and Meteorologic Laboratories, Miami, Florida. tions as a consequence of the fashion in which the bed is built; the main subpopulation (A population) com- prises the framework of the deposit. A fine B population is interstitial; a coarse C population is the consequence of "traction ; The A:B:C ratio varies with the flow regime. Bed forms are irregularities in the particulate sub- strate of a fluid flow. Sheared flow is innately unstable, and tends to develop repeated patterns of velocity vari- ation, either parallel or normal to the flow direction. Such instabilities
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