Evidence of the Importance of Deposition and Winnowing of Surficial Sediments at a Continental Shelf Scale

K. P. Black

Abstract


Surficial sediment grain sizes in Bass Strait, southern Australia, vary widely across the Strait. When compared to a calibrated numerical hydrodynamic model of the M2 tidal circulation, this grain size variation was found to correspond with tidal current intensity. In particular, a correspondence between the sediment entrainment threshold velocity and the maximum tidal current was observed. The results highlight the importance of deposition and winnowing at a continental shelf scale while indicating that current strength is the dominant factor determining the nature of the modern sea bed throughout Bass Strait.


Keywords


Sediment dynamics; hydrodynamic model; tidal currents

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