Geo-Marine Letters

, Volume 21, Issue 2, pp 66-74

First online:

Modern sediment supply to the lower delta plain of the Ganges-Brahmaputra River in Bangladesh

  •  M. AllisonAffiliated withDepartment of Geology, Dinwiddie Hall, Tulane University, New Orleans LA 70118, USA
  • ,  E. KeppleAffiliated withDepartment of Geology and Marine Sciences, University of South Carolina, Columbia SC 29208, USA

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Abstract.

Vibracores and auger samples collected from the lower (tidal) delta plain of the Ganges-Brahmaputra River in Bangladesh were examined to determine whether the area is a significant sink for riverine sediments. Measurements of 137Cs activity and radiocarbon in the sediments indicate sediment accumulation is taking place on decadal and millennial time scales at rates reaching 1.1 cm/year. The sediment of the lower delta plain is primarily derived from an offshore source after having originally been supplied by the Ganges-Brahmaputra river system, carried westward by prevailing currents and advected inland by monsoonal coastal setup and cyclonic events.