Burden, C. A. Texas A&M University, cburden@ocean.tamu.edu
Gardner, W. A. Texas A&M University, wgardner@ocean.tamu.edu
Richardson, M. Texas A&M University, mrichardson@ocean.tamu.edu
Asper, V. L. University of Southern Mississippi, vernon.asper@usm.edu

Many submarine canyons are active sites of sediment accumulation and transport. V-shaped canyons have been found to focus internal tides, causing sediment to be resuspended and transported downslope. Canyons which are wider at the head show little evidence of resuspension and downslope transport. In this study of offshelf transport in the Mississippi Canyon, profiles of light transmission collected during October 1994 and May 1998 show that a particulate maxima extends from the shelf break into the canyon axis. These detached nepheloid layers were not observed on the slope to either side of the canyon. The temporal variability in currents, temperature, and particulate matter was measured at a station located at 300 m depth in the canyon axis during May-July 1998 and August-November 1998. Two moored current meters, one at 5 mab and one at 50 mab, recorded near-bottom flow, while thermographs, a light scattering sensor, and sediment traps gathered information about the characteristics of the flow. Video footage obtained from an ROV revealed differences in small-scale surface topography between the canyon axis and the walls of the canyon.
Day: Thursday, Feb. 4
Time: Poster
Location: Sweeney Center
Code: CS57TH0475S