Rippled scour depressions on the inner continental shelf off central California

Journal of Sedimentary Petrology
By: , and 

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Abstract

Side-scan sonar records taken during the recent Coastal Ocean Dynamics Experiment (CODE) show elongate, shore-normal tippled depressions of low relief on the inner continental shelf off central California between Bodega Bay and Point Arena. These features extend up to 2 kin from the coast into water depths of up to 65 m. The proposed mechanism for their generation is storm- generated bottom currents associated with coastal downwelling during the late fall and winter which scour the surficial fine-sand sediment and expose the coarser-sand substrate in the depressions. The zones of most intense erosion and the irregular spacing of the features may be controlled by submerged rock ledges and other prominent coastal features. The large straight-crested ripples within the depres- sions (heights to 40 cm; wavelengths to 1.7 m) are probably formed by large-amplitude, long-period surface waves generated by winter storms.

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Additional publication details

Publication type Article
Publication Subtype Journal Article
Title Rippled scour depressions on the inner continental shelf off central California
Series title Journal of Sedimentary Petrology
Volume 54
Issue 4
Year Published 1984
Language English
Publisher The Society of Economic Paleontologists and Mineralogists
Description 12 p.
Larger Work Type Article
Larger Work Subtype Journal Article
Larger Work Title Journal of Sedimentary Petrology
First page 1280
Last page 1291
Country United States
State California