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Sediment exchange between Amazon mudbanks and shore-fringing mangroves in French Guiana
 

Summary: Sediment exchange between Amazon mudbanks and shore-fringing
mangroves in French Guiana
Mead A. Allisona,*, Michael T. Leeb
a
Department of Earth and Environmental Sciences, Tulane University, New Orleans, LA 70118, USA
b
Department of Oceanography, Texas A and M University, 5007 Avenue U., Galveston, TX 77551, USA
Received 3 July 2002; accepted 14 April 2004
Abstract
Time-series remote sensing data, sediment cores, and water column profiles of fluid properties and suspended sediment
concentration were utilized to examine the mechanisms and volumes of sediment exchange between the mangrove fringe and
the coastal zone in French Guiana. Remote sensing estimates of sediment yield from mangrove shoreline erosion by wave attack
during the f 30-year periods when offshore Amazon mudbanks are not adjacent to a 30­40 km long section of the shoreline
are 6­23 million tons yearÀ 1
. 7
Be, 137
Cs, and 210
Pb inventories in sediment cores from inner ( < 5 m water depth) mudbank
areas suggest the mangrove erosion occurs primarily during the January­April period of high wave energy, and is responsible
for the bulk of sediment deposition on the leading edge of the mudbank. Remote sensing estimates of shoreline accretion

  

Source: Allison, Mead - Institute for Geophysics, University of Texas at Austin

 

Collections: Geosciences