ICCE 2012 Cover Image


bed reworking
cohesive sediment
muddy clinoform
ocean waves

How to Cite

COUPLED WAVE-BED DYNAMICS, ATCHAFALAYA SHELF, LOUISIANA. (2012). Coastal Engineering Proceedings, 1(33), sediment.116.


Observations of waves, currents, suspended sediment concentration and acoustic backscatter are used to re-investigate the interaction between the combined wave-current flow and cohesive sediments on the muddy Atchafalaya inner shelf. Observations support the previously proposed bed reworking cycle by waves of mobilization and resuspension of bed sediment, erosion, deposition with fluid mud formation and consolidation. Suspended sediment concentration profiles are estimated based on the acoustic backscatter of a current profiler. A one-dimensional vertical bottom boundary model is used to reconstruct the vertical structure of the flow characteristics, and estimate parameters difficult to observe directly, such as bottom shear stress. Estimated bed position, concentration profiles and computed bottom stresses remarkably support the previous findings on the bottom stress-resuspension relation, critical shear stress for erosion and bed density variation throughout a storm.


Allison M.A., G.C. Kineke, E.S. Gordon, and M.A. Goni. 2000. Development and reworking of a seasonal flood deposit on the inner continental shelf off the Atchafalaya River, Cont. Shelf Res., 20, 2267-2294.

Hsu, T.-J., C.E. Ozdemir, and P.A. Traykovski. 2009. High resolution numerical modeling of wave supported gravity driven mudflows, J. Geophys. Res., 114, C5, doi:10.1029/2008JC005006.

Jaramillo, S., A. Sheremet, M.A. Allison, A.T. Reed, and K.T. Holland. 2009. Wave-mud interactions over the muddy Atchafalaya subaqueous clinoform, Louisiana, USA: Wave-driven sediment transport, J. Geophys. Res., 114, C04002, doi: 10.1029/2008JC004821.

Kineke, G.C., E.E. Higgins, K. Hart, and D. Velasco. 2006. Fine-sediment transport associated with cold-front passages on the shallow shelf, Gulf of Mexico, Cont. Shelf Res., 26, 2073-2091.

Safak, I., A. Sheremet, M.A. Allison, and T.J. Hsu. 2010. Bottom turbulence on the muddy Atchafalaya Shelf, Louisiana, USA, J. Geophys. Res., 115, doi:10.1029/2010JC006157.

Safak, I., C. Sahin, J.M. Kaihatu, and A. Sheremet, under review, Modeling wave-mud interaction on the central chenier-plain coast, western Louisiana Shelf, USA. Sahin, C., I. Safak, T.-J. Hsu, and A. Sheremet. under review. Observations of sediment stratification on the muddy Atchafalaya Shelf, Louisiana, USA.

Sahin, C., I. Safak, A. Sheremet, and A.J. Mehta. 2012. Observations on cohesive bed reworking by waves: Atchafalaya Shelf, Louisiana, J. Geophys. Res., doi:10.1029/2011JC007821.

Sheremet A., and G.W. Stone. 2003. Observations of nearshore wave dissipation over muddy sea beds, J. Geophys. Res., 108, C11, 24, doi: 10.1029/2003JC001885.

Sheremet A., A.J. Mehta, B. Liu, and G.W. Stone. 2005. Wave-sediment interaction on a muddy inner shelf during Hurricane Claudette, Est. Coas. Shelf Sci., 63, 225-233.

Sheremet A., S. Jaramillo, S.-F. Hsu, M.A. Allison, and K.T. Holland. 2011. Wave-mud interactions over the muddy Atchafalaya subaqueous clinoform, Louisiana, United States: Wave processes, J. Geophys. Res., 116, C06005, doi: 10.1029/2010JC006644.

Thorne, P.D., and D.M. Hanes. 2002. A review of acoustic measurement of small-scale sediment processes, Con. Shelf. Res., 28, 309-317.

Traykovski, P., P.L. Wiberg, and W.R. Geyer. 2007. Observations and modeling of wave supportedsediment gravity flows on the Po prodelta and comparison to prior observations from the Eel shelf, Cont. Shelf Res., 27, 375-399.

Authors retain copyright and grant the Proceedings right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this Proceedings.