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Sediment transport by tropical cyclones recorded in a submarine canyon off Bangladesh

(2018) GEO-MARINE LETTERS. 38(6). p.481-496
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Abstract
Frequent cyclones originating in the Bay of Bengal landfall on the delta coast of the Ganges and Brahmaputra rivers. The cyclones are well recorded in the sediments of a canyon that is deeply incised into the shelf offshore Bangladesh. The large mud supply by the two rivers forms temporary deposits on the innermost shelf, where they are mobilized by waves and currents during the passage of cyclones. The resulting, highly concentrated fine sand-silt-clay suspension is moved by wind-induced currents and eventually plunges into the shelf canyon. These gravity flows are deposited as graded beds on the broad canyon floor. In a 362-cm-long section of a dated sediment core covering the period from 2006 to 1985, nearly all 59 graded beds can be correlated with 42 cyclones observed in that period. The threefold decrease in the sedimentation rate of the last decade compared to the period from 1994 to 1954 is due to the decreased number and power of cyclones. Compared to the sediment transfer by cyclones, the input by local sediment slumps, tidal currents, and monsoonal floods is small. Thus, cyclones dominate the mobilization and distribution of sediment on the Bangladesh shelf. This sediment dispersal mechanism is probably also typical for other shelf areas crossed by tropical cyclones.
Keywords
GANGES-BRAHMAPUTRA DELTA, NO GROUND BAY, CONTINENTAL SHELVES, RIVER SYSTEM, SUBAQUEOUS DELTA, MUD DEPOCENTERS, BENGAL FAN, SEA, OCEAN, HURRICANE

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Chicago
Kudrass, Hermann R, Björn Machalett, Luisa Palamenghi, Inka Meyer, and Wenyan Zhang. 2018. “Sediment Transport by Tropical Cyclones Recorded in a Submarine Canyon Off Bangladesh.” Geo-marine Letters 38 (6): 481–496.
APA
Kudrass, H. R., Machalett, B., Palamenghi, L., Meyer, I., & Zhang, W. (2018). Sediment transport by tropical cyclones recorded in a submarine canyon off Bangladesh. GEO-MARINE LETTERS, 38(6), 481–496.
Vancouver
1.
Kudrass HR, Machalett B, Palamenghi L, Meyer I, Zhang W. Sediment transport by tropical cyclones recorded in a submarine canyon off Bangladesh. GEO-MARINE LETTERS. 2018;38(6):481–96.
MLA
Kudrass, Hermann R, Björn Machalett, Luisa Palamenghi, et al. “Sediment Transport by Tropical Cyclones Recorded in a Submarine Canyon Off Bangladesh.” GEO-MARINE LETTERS 38.6 (2018): 481–496. Print.
@article{8587316,
  abstract     = {Frequent cyclones originating in the Bay of Bengal landfall on the delta coast of the Ganges and Brahmaputra rivers. The cyclones are well recorded in the sediments of a canyon that is deeply incised into the shelf offshore Bangladesh. The large mud supply by the two rivers forms temporary deposits on the innermost shelf, where they are mobilized by waves and currents during the passage of cyclones. The resulting, highly concentrated fine sand-silt-clay suspension is moved by wind-induced currents and eventually plunges into the shelf canyon. These gravity flows are deposited as graded beds on the broad canyon floor. In a 362-cm-long section of a dated sediment core covering the period from 2006 to 1985, nearly all 59 graded beds can be correlated with 42 cyclones observed in that period. The threefold decrease in the sedimentation rate of the last decade compared to the period from 1994 to 1954 is due to the decreased number and power of cyclones. Compared to the sediment transfer by cyclones, the input by local sediment slumps, tidal currents, and monsoonal floods is small. Thus, cyclones dominate the mobilization and distribution of sediment on the Bangladesh shelf. This sediment dispersal mechanism is probably also typical for other shelf areas crossed by tropical cyclones.},
  author       = {Kudrass, Hermann R and Machalett, Björn and Palamenghi, Luisa and Meyer, Inka and Zhang, Wenyan},
  issn         = {0276-0460},
  journal      = {GEO-MARINE LETTERS},
  keywords     = {GANGES-BRAHMAPUTRA DELTA,NO GROUND BAY,CONTINENTAL SHELVES,RIVER SYSTEM,SUBAQUEOUS DELTA,MUD DEPOCENTERS,BENGAL FAN,SEA,OCEAN,HURRICANE},
  language     = {eng},
  number       = {6},
  pages        = {481--496},
  title        = {Sediment transport by tropical cyclones recorded in a submarine canyon off Bangladesh},
  url          = {http://dx.doi.org/10.1007/s00367-018-0550-x},
  volume       = {38},
  year         = {2018},
}

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