Browsing by Author "Nielsen, AF"

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    Evolving role of radiotracers in coastal zone studies
    (Pergamon-Elsevier Science Ltd., 2003-03-01) Airey, PL; Hughes, CE; Kluss, T; Duran, EB; Miller, BM; Chiuenta, S; Nielsen, AF; Hollins, SE
    Recent advances in the off-shore radiotracing program in the Asia Pacific region are described with examples from the Philippines, Thailand, Hong Kong and Australia. Advances are driven by changing requirements from the user community which include: (1) the need to experimentally evaluate the output of numerical models underpinning engineering and environmental investigations; (2) the need to address increasingly sophisticated questions posed by researchers into coastal ecosystems; and (3) the need to respond to pressures from regulators to minimise the level of tracer released to the environment. Four stages in the recent evolution of tracer technology are identified. Crown Copyright © 2003 2003 Published by Elsevier Science Ltd.
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    Field verification of formulations for sand transport under wave and current action
    (Institution of Engineers, Australia,, 2001-10-05) Nielsen, AF; Kluss, T; Hughes, CE; Sojisuporn, P; Chueinta, S; Adamantidis, CA
    This paper presents and compares field and analytical data on the net transport of sand under wave and tidal current action as measured and computed at the entrance to a large estuary on the south-east coast of Thailand. The field data comprised time histories over six weeks of wind speed and direction, tidal stage variation and the direct measurement of sand transport at two locations in shallow water using radioisotope tracer techniques. Analytical formulations were used to estimate wave conditions, tidal current velocities and sediment transport rates. Comparison of results showed that the analytical formulations predicted very well the magnitude and direction of the net transport of sand at the two locations over the six-week period where the field measurements were made. © 2021 Informit