. Bulletin. Science; Natural history; Natural history. 1973 CLOD-CARD MI:.\sui<l:MENT (il WATER MOTlOh â II iâr "iâr "iâr iâr [ii,i w.' to cr UJ. 1 i- *2 +1 0 -I -2 -3 -4 -5 -6 -7 -8 -9 -10 -II -12 -13 -14 -15 -16 -17 -18 -19 -20 -21 CLOD CARD CHANGE («) 0 6 12 18 24 30 36 42 48 54 60 66 72 78 84 90 96 102 108 114 120 126 SEDIMENT TRAPPED (°) GRAMS Figure I. Weight change of clod-cards and amount of trapped sediment plotted as a function depth. Data shown are from one 24-hour exposure period. Above the m level, all sediment traps and some clod-cards were damaged by a boa
. Bulletin. Science; Natural history; Natural history. 1973 CLOD-CARD MI:.\sui<l:MENT (il WATER MOTlOh â II iâr "iâr "iâr iâr [ii,i w.' to cr UJ. 1 i- *2 +1 0 -I -2 -3 -4 -5 -6 -7 -8 -9 -10 -II -12 -13 -14 -15 -16 -17 -18 -19 -20 -21 CLOD CARD CHANGE («) 0 6 12 18 24 30 36 42 48 54 60 66 72 78 84 90 96 102 108 114 120 126 SEDIMENT TRAPPED (°) GRAMS Figure I. Weight change of clod-cards and amount of trapped sediment plotted as a function depth. Data shown are from one 24-hour exposure period. Above the m level, all sediment traps and some clod-cards were damaged by a boat in this run of the experiment. The positions of curves were determined by eye. The two types of instruments, the clod-cards and the sediment traps, were mounted at intervals along a 24-foot long, 1-inch by 2-inch wooden board. At each interval a sediment trap and a clod-card were fastened on the stringer with masking tape, so that they were opposite one an- other and at the same elevation. The distance between successive positions was varied to pro- vide a more intense measurement series in certain "critical" segments of the transect. Thus, the intervals were 3 inch for the bottom 2 ft, then 6 inch for the next 2% ft. The maximum interval of one foot was in mid-water; then, near the surface, the interval was again 6 inch. In use this string of instruments was positioned so the to- and-fro surging motion of the water was parallel to the long axis of the sediment traps and the short axis of the clod-cards. The wooden stringer with the instruments attached was then strapped vertically to a piling on Goleta pier near the Santa Barbara, California, campus of the Univer- sity of California. Only the more complete of two experiments is described here. After 24 hours the instruments were retrieved. The weight lost from each of the clod-cards and the amount of sediment in each of the traps was measured (Fig. 1) and their values compared. The lack of values at severa
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