W&M ScholarWorks VIMS Articles 2007 Sediment pumping by tidal asymmetry in a partially mixed estuary Malcolm Scully Carl T. Friedrichs Virginia Institute of Marine Science,
[email protected] Follow this and additional works at: https://scholarworks.wm.edu/vimsarticles Part of the Marine Biology Commons Recommended Citation Scully, Malcolm and Friedrichs, Carl T., "Sediment pumping by tidal asymmetry in a partially mixed estuary" (2007). VIMS Articles. 276. https://scholarworks.wm.edu/vimsarticles/276 This Article is brought to you for free and open access by W&M ScholarWorks. It has been accepted for inclusion in VIMS Articles by an authorized administrator of W&M ScholarWorks. For more information, please contact
[email protected]. JOURNAL OF GEOPHYSICAL RESEARCH, VOL. 112, C07028, doi:10.1029/2006JC003784, 2007 Sediment pumping by tidal asymmetry in a partially mixed estuary Malcolm E. Scully1 and Carl T. Friedrichs2 Received 28 June 2006; revised 22 February 2007; accepted 11 April 2007; published 28 July 2007. [1] Observations collected at two laterally adjacent locations are used to examine the processes driving sediment transport in the partially mixed York River Estuary. Estimates of sediment flux are decomposed into advective and pumping components, to evaluate the importance of tidal asymmetries in turbulent mixing. At the instrumented location in the estuarine channel, a strong asymmetry in internal mixing due to tidal straining is documented, with higher values of eddy viscosity occurring during the less-stratified flood tide. As a result of this asymmetry, more sediment is resuspended during the flood phase of the tide resulting in up-estuary pumping of sediment despite a net down-estuary advective flux.