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    <copyright>Copyright © 2026. National Academy of Sciences. All rights reserved.</copyright>
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    <managingEditor>tris-trb@nas.edu (Bill McLeod)</managingEditor>
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      <title>DREDGING</title>
      <link>https://trid.trb.org/View/157267</link>
      <description><![CDATA[A wide-ranging review which discusses developments in dredging technology and their application in the field.  It covers a history of dredging; dredging and siltation--cause and effect; the behaviour of the dredged area of Walney Channel; the investigation of spoil movement in the Firth of Forth using radioactive tracers; the use of tracers to determine infill rates in projected dredged channels; the development of The River Tees--deepening, widening, and extension of the navigable channel; recent research developments in hydraulic dredging; reclamation dredging and instrumentation; towards automation in inshore hydrographic surveying.]]></description>
      <pubDate>Fri, 06 Feb 1981 00:00:00 GMT</pubDate>
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      <title>APPRAISAL OF RADIOACTIVE TRACER TECHNIQUES IN DREDGING OPERATIONS</title>
      <link>https://trid.trb.org/View/37225</link>
      <description><![CDATA[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.]]></description>
      <pubDate>Wed, 21 Apr 1976 00:00:00 GMT</pubDate>
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