NH23D-07
Hurricane Sandy Washover Deposits on Southern Long Beach Island, NJ
Tuesday, 15 December 2015: 15:10
309 (Moscone South)
James M Bishop1, Bruce M Richmond2, Haunani H Kane3 and Brent Lunghino2,4, (1)University of Hawaii at Manoa, Department of Geology and Geophysics, Honolulu, HI, United States, (2)USGS, Pacific Coastal and Marine Geology Science Center, Santa Cruz, CA, United States, (3)University of Hawaii at Manoa, Honolulu, HI, United States, (4)Stanford University, Department of Computational and Mathematical Engineering, Stanford, CA, United States
Abstract:
Hurricane Sandy washover deposits were investigated at Forsyth National Wildlife Refuge (FNWR) on Southern Long Beach Island, New Jersey in order to map deposit thickness and characterize the sedimentary deposits. FNWR was chosen as a field area because there has been relatively little anthropogenic shoreline modification since washover deposition from Hurricane Sandy. Sediment, elevation, and geophysical data were collected during the April 2015 field campaign, approximately two and a half years after the storm. Sediment deposit data included trenches, stratigraphic descriptions, bulk sediment samples, push cores, Russian cores, and photos. Computed tomography (CT) scanning was conducted on push cores in order to acquire high resolution imaging of density, grain size, and sedimentary structure. Profiles of washover elevation were measured using Differential GPS with Real Time Kinematic processing. Ground Penetrating Radar data was collected to image the depth of the deposit and identify sedimentary structures. These data sets are compared to pre- and post -Sandy lidar surveys in order to determine post-Sandy modification in the two and a half years following the hurricane. We compare sediment thickness and sedimentary characteristics to hurricane Sandy deposits elsewhere along the U.S. eastern seaboard and to tsunami deposits.
