Secondary Flows and Sediment Problems near Coastal Marine Outfalls

The purpose of this study is to define the flow pattern of nearshore bottom currents driven by wave-current interaction and thus to confirm hydrodynamics mechanisms associated with morphological changes at open channel ocean outfalls at the shore. Use is made of an earlier study on the interaction of horizontal momentum jets and opposing shallow water eaves at a shore, and of an unpublished later laboratory study. The turbulent jet discharge was shore-normal, directed offshore, and the incident wave direction was shore-normal, traveling toward shore. The waves approaching shore were refracted by the horizontal shear of the jet. Flow visualization was used to determine the flow pattern in the jet and the induced circulation on both sides of the jet, for a range of wave and jet characteristics. The experimental data showed several distinct flow patterns regimes. Theoretical analyses were conducted to yield quantitative design parameters to characterize various flow pattern regimes. The observed flow regimes were found to depend on the ratio of the wave momentum action on the jet to the jet initial momentum. Confirmation of the obtained design parameters was obtained by comparison with field data for the formation of accretion shoals and erosion sports near marine outfalls.

Language

  • English

Media Info

  • Media Type: Print
  • Features: Figures; References; Tables;
  • Pagination: pp 764-776
  • Monograph Title: Coastal Structures 2003

Subject/Index Terms

Filing Info

  • Accession Number: 01004021
  • Record Type: Publication
  • ISBN: 0784407339
  • Files: TRIS
  • Created Date: Sep 2 2005 12:59PM