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Sedimentation Control to Reduce Maintenance Dredging of Navigational Facilities in Estuaries Report and Symposium Proceedings (1987) / Chapter Skim
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Overview of Symposium Technical Sessions
Pages 8-24

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From page 12...
... The hybrid approach makes optimal use of both physical and mathematical modeling by using the physical model to obtain the current field and the numerical model of suspended sediment transport to predict sedimentation rates. This method, pioneered by the Waterways Experiment Station, has been used to study both the Columbia River estuary and Kings Bay, Georgia.
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From page 16...
... Environmental Considerations Environmental considerations during dredging operations are numerous and include the nature and location of the material to be dredged, whether materials are contaminated and if so with what, potential resuspension during dredging operations-, movement and subsequent redeposition of resuspended sediments, use of the habitat involved by humans and animals, type of dredging equipment available, and method of disposal of the dredged material. Reports by the Waterways Experiment Station on results obtained during the Dredged Material Research Program (DMRP)
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From page 17...
... Roberts, Session Chair The presentations in this session covered information about location, methods, effects, and regulation of dredged material disposal. Case histories of material disposal in San Francisco Bay and Tampa Bay reveal problems of land and estuary disposal.
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From page 18...
... The absence of available sites emphasizes the need for establishment of a water disposal site in lower San Francisco Bay, and an expansion of the definition of water-dependent use to include dredged material disposal. Diminishing land disposal capacity also reinforces the desirability of reserving such capacity for Serial that cannot be safely or legally placed in open water.
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From page 19...
... An example of the impasse that these considerations create is exemplified in the Alafia and Big Bend channel projects, which require the disposal of 11 million yd~ of silt, sand, and rock. Eight potential land disposal sites were considered, but high costs made the proj ect infeasible .
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From page 23...
... Minimizing sedimentation races by designing facilities Chat enhance continued transport of sediments through the facilities can be achieved by minimizing obstruction of currents, providing gradual transitions in ache bed in the direction of the currents, orienting wharves parallel to the dominant currents, and presenting the minimum cross section of wharf facilities to the currents. Prevention of sediment-laden waters from entering a dredged basin in regions with weak currents usually requires construction of a watertight enclosure, as described previously.
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Key Terms

  • maintenance dredging
  • sediment transport
  • sedimentation rates
  • material disposal
  • transport processes

  • francisco bay
  • disposal sites
  • advance maintenance
  • land disposal
  • waterways experiment

  • experiment station
  • tampa bay
  • hydrographic surveys
  • reduce maintenance
  • predictive techniques

  • dredging equipment
  • numerical models
  • session chair
  • usually requires
  • dredged materials

  • dredging operations
  • suspended solids
  • estuarial sediment
  • contaminated dredged
  • related facilities

  • extrapolate shoaling
  • minimum cross
  • army engineer
  • dredged basin
  • advocates tend


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