PREDICTION OF BOTTOM CURRENT VELOCITIES FROM SEDIMENT DEPOSITS ON THE SEA BED.
CALIFORNIA UNIV BERKELEY HYDRAULIC ENGINEERING LAB
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The questions of predicting bottom current velocities from the grain sizes of sediments deposited on the sea bed by them is analyzed. Equations for this purpose are derived from various considerations, such as energy equilibrium and momentum equilibrium. The equations so derived and those existing in the literature are critically evaluated and their defects and limitations described. Relationships for the determination of the thickness and concentration of a turbidity current are also developed. Computations have been made using the results of analyses of sediment samples from the Monterey Fan. The proposed current velocity vs. grain size relationship yields a range of velocities from 0.7 to 6.3 metressec for the turbidity current that might have passed through the Monterey Fan. The possibility of sediment transport by other mechanisms on the sea floor is also pointed out. Author
- Physical and Dynamic Oceanography