Skip to Main Content
Book Chapter

Wave-Current Dispersal of Fine-Grained Fluvial Sediments Across Continental Shelves: the Significance of Hyperpycnal Plumes

By
Samuel J. Bentley, Sr.
Samuel J. Bentley, Sr.
Search for other works by this author on:
Published:
January 01, 2003

Abstract

Recent studies of fluvial-marine sediment dispersal have demonstrated that, under conditions of adequate sediment supply and intense turbulence in the bottom- boundary layer, wave-enhanced gravity flows can develop on shelves with gradients <0.7°. These conditions can exist seasonally on many continental shelves proximal to river mouths. Therefore, such flows (and resultant deposits) are probably more widespread than previously thought. Examples from a high-energy active-margin setting (Eel Shelf, California) and a lower energy passive margin (Atchafalaya River/Louisiana Inner Shelf) indicate that similar bedding can be produced by high- concentration near bed flows in apparently contrasting depositional settings, due to the occurrence of similar physical processes in the bottom boundary layer. Because such hyperpycnal flows can carry much more sediment mass than can buoyant plumes of suspended sediment, and can move at velocities on the order of cm s-1, such benthic sediment flows on shelves could represent a significant and previously underestimated transport mechanism for fine sediment across continental shelves.

You do not currently have access to this article.

Figures & Tables

Contents

SEPM Miscellaneous Publication

Siltstones, Mudstones and Shales: Depositional Processes and Characteristics

Erik D. Scott
Erik D. Scott
Shell International Exploration & Production, 200 North Dairy Ashford, Houston, Texas 77079
Search for other works by this author on:
Arnold H. Bouma
Arnold H. Bouma
Dept. of Geology & Geophysics, Louisiana State University, Baton Rouge, Louisiana 70803
Search for other works by this author on:
William R. Bryant
William R. Bryant
Dept. of Oceanography, Texas A&M University, College Station, Texas 77843
Search for other works by this author on:
SEPM Society for Sedimentary Geology
Volume
1
ISBN electronic:
9781565760943
Publication date:
January 01, 2003

GeoRef

References

Related

Citing Books via

Close Modal
This Feature Is Available To Subscribers Only

Sign In or Create an Account

Close Modal
Close Modal