APPRAISAL OF RADIOACTIVE TRACER TECHNIQUES IN DREDGING OPERATIONS

The cost of dredging can be minimized by reducing the distance to the dumping site. A balance must be established between the cost of transport and the eventual return of spoils to the deepened areas. The cost of transport is known but the efficiency of the dumping site is much more difficult to establish. Two fundamental processes must be studied; the transport of spoils in suspension during dumping and the transport or erosion from the bottom of the spoils by currents or waves. The transport of suspended sediments is characterized by particle direction and velocity, dispersion coefficients and siltation rate. Not much is known about dispersion coefficients and siltation rate, and field estimations are not easy to obtain. When fine sand is transported in suspension, its settling velocity is known and extrapolation to field conditions (high turbulence) is probably correct. But this is not the case when fine sediments are transported in suspension since their size and density depend on salinity and turbulence, and thus accurate extrapolations are not possible. This article reviews how radio-active tracer techniques can be used to follow the actual movement of sediments and give information about transport parameters in practice.

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  • Corporate Authors:

    International Association of Dredging Companies

    Duirweg 21
    The Hague 2011,   Netherlands 
  • Authors:
    • Sauzay, G
  • Publication Date: 1975

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Filing Info

  • Accession Number: 00131502
  • Record Type: Publication
  • Source Agency: International Association of Dredging Companies
  • Files: TRIS
  • Created Date: Apr 21 1976 12:00AM