PREDICTING SEDIMENT TRANSPORT AND DEPOSITION PATTERNS IN MOBILE BAY, ALABAMA

The objective of this study is the application of hydrodynamic and material transport mathematical models for Mobile Bay in analysing the effect of channelisation and dredging activities on sediment distribution profiles. Of particular importance are the seasonal variations of sediment transport and deposition behaviour which are critically influenced by current patterns within the estuary. Results are presented for three cases corresponding to high (2800 cu m/s), medium (1100 cu m/s) and low (500 cu m/s) river flow rate conditions. The extent of sediment transport and deposition is assessed by determining the tidal cycle average velocity for various locations in the bay. A value of 0.06 m/s for this velocity correlates well with depositional patterns observed from bathimetric data over the past century. A comparison of the depositional patterns predicted if the Mobile ship channel had not been constructed with those developed in the present system is also presented for a river flow rate of 3500 cu m/s. Short term variations resulting from maintenance dredging activities are also analysed. Included in this study are the input of sediment from dredging discharge lines and the resultant transportation and deposition patterns established by the controlling current velocities in the area. Model trend results are verified with field data collected during May 1972.

  • Supplemental Notes:
    • Paper E-3 from BHRA Fluid Engineering Symposium, University of Kent, Canterbury, England.
  • Corporate Authors:

    British Hydromechanics Research Association

    Cranfield MK43 0AJ, Bedfordshire,   England 
  • Authors:
    • April, G C
    • Brett, C E
  • Publication Date: 1975-9

Subject/Index Terms

Filing Info

  • Accession Number: 00128426
  • Record Type: Publication
  • Source Agency: British Hydrodynamics Research Association
  • Files: TRIS
  • Created Date: Jan 14 1976 12:00AM