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TitleSEDTRANS96: the upgraded and better calibrated sediment-transport model for continental shelves
AuthorLi, M ZORCID logo; Amos, C L
SourceComputers and Geosciences vol. 27, issue 6, 2001 p. 619-645,
LinksAbstract - Résumé
LinksProgram code available online - Logiciel disponible en direct
Alt SeriesGeological Survey of Canada, Contribution Series 1998216
PublisherElsevier BV
Mediapaper; on-line; digital
File formatpdf
ProvinceEastern offshore region
AreaSable Island
Lat/Long WENS -60.8333 -60.1333 44.1667 43.6667
Subjectsmathematical and computational geology; sedimentology; erosion; sediment transport; deposition; sediment stability; coastal environment; continental shelf; computer applications; software; field data methods; modelling
Illustrationstables; formulae; location maps; graphs
ProgramProgram of Energy Research and Development (PERD)
AbstractThe sediment transport model SEDTRANS has been significantly upgraded based on new advances in both cohesive and non-cohesive sediment transport studies. For given input data of wave, current, and seabed conditions, the model applies the combined wave-current bottom boundary layer theories to derive the near-bed velocity profile and bed shear stresses, and then calculates sediment transport for currents only or combined waves and currents over either cohesive or non-cohesive sediments. Critical shear stresses for various sediment transport modes tested for combined waves and currents are adopted in SEDTRANS96. An explicit combined-flow ripple predictor is included in the model to provide time-dependent bed roughness prediction. SEDTRANS96 also predicts the vertical profiles of velocity and suspended sediment concentration and their product is integrated through depth to derive the suspended-load transport rate. More rigorous calibration of the model using measured sediment transport rates over fine and medium sands shows that the difference between the predicted and measured transport rates has been reduced from more than one order of magnitude to less than a factor of five. The proposed new cohesive sediment algorithm separates cohesive sediment transport into depositional, stable and erosional states. The applied shear stress, erosion/deposition time duration and the down-core profile of the critical shear stress for erosion are numerically integrated to predict the final erosion or deposition rate, suspension concentration and transport rate for cohesive sediment.

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