title: Assessing mobility and redistribution patterns of sand and oil agglomerates in the surf zone.
abstract: Heavier-than-water sand and oil agglomerates that formed in the surf zone following the Deepwater Horizon oil spill continued to cause beach re-oiling 3years after initial stranding. To understand this phenomena and inform operational response now and for future spills, a numerical method to assess the mobility and alongshore movement of these "surface residual balls" (SRBs) was developed and applied to the Alabama and western Florida coasts. Alongshore flow and SRB mobility and potential flux were used to identify likely patterns of transport and deposition. Results indicate that under typical calm conditions, cm-size SRBs are unlikely to move alongshore, whereas mobility and transport is likely during storms. The greater mobility of sand compared to SRBs makes burial and exhumation of SRBs likely, and inlets were identified as probable SRB traps. Analysis of field data supports these model results.
authors: U.S. Geological Survey, St. Petersburg Coastal and Marine Science Center, 600 4th Street South, Saint Petersburg, FL 33704, United States. Electronic address: sdalyander@usgs.gov.
authors: P Soupy
authors: PS
authors: Dalyander
authors: U.S. Geological Survey, St. Petersburg Coastal and Marine Science Center, 600 4th Street South, Saint Petersburg, FL 33704, United States.
authors: Joseph W
authors: JW
authors: Long
authors: U.S. Geological Survey, St. Petersburg Coastal and Marine Science Center, 600 4th Street South, Saint Petersburg, FL 33704, United States.
authors: Nathaniel G
authors: NG
authors: Plant
authors: U.S. Geological Survey, St. Petersburg Coastal and Marine Science Center, 600 4th Street South, Saint Petersburg, FL 33704, United States.
authors: David M
authors: DM
authors: Thompson
mesh_terms: D000407:Alabama; D061006:Bays / Q000737:chemistry; D004784:Environmental Monitoring; D005431:Florida; D019015:Geologic Sediments / Q000737:chemistry; D008956:Models, Chemical; D010578:Petroleum / Q000032:analysis*; D059392:Petroleum Pollution / Q000032:analysis* / Q000706:statistics & numerical data; D012822:Silicon Dioxide / Q000737:chemistry; D014872:Water Movements; D014874:Water Pollutants, Chemical / Q000032:analysis*
chemical_list: D010578:Petroleum; D014874:Water Pollutants, Chemical; D012822:Silicon Dioxide
keywords: Deepwater Horizon; Gulf of Mexico; Oil spill; Surf zone; Surface residual balls; Tarballs