Browsing by Author "Bandeira, JV"

Now showing 1 - 4 of 4
  • Thumbnail Image
    Item
    Applications and impact of radiotracers and nucleonic measurement systems for investigation of sediment transport
    (American Nuclear Society, 2014-08-28) Bandeira, JV; Salim, LH; Brisset, P; Hughes, CE
    Not available.
  • Thumbnail Image
    Item
    Artificial radiotracer applications in aquatic environment
    (International Atomic Energy Agency, 2015-01-01) Bandeira, JV; Hughes, CE
    The use of artificial radiotracers in the environment is analogous to their use in the human body. In both domains they provide data on flow rates and pathways, on exchange with materials and on their final discharge from the studied system. Artificially injected radiotracers have been used to investigate flow in natural waters since the 1950's. Identification of flow paths, diagnosis of blockages or leakage, measurement of flow rates, dispersion and exchange processes, such as biological uptake or sorption, are all aspects to which a wide range of artificial radioactive tracers have been applied. Increasingly radiotracers are used in combination with numerical modelling to improve confidence in the predictive capacity of models used in the management of our water resources and to extend their spatial applicability. In turn this allows us to use less and less tracer and demonstrate that the human and environmental impact of modern radiotracer studies is minimal. © The authors.
  • No Thumbnail Available
    Item
    Nuclear techniques for monitoring sediment dynamics in the coastal zone
    (Springer, 2014-01) Bandeira, JV; Salim, LH; Bomtempo, VL; Moreira, RM; Brisset, P; Hughes, CE; Wörman, A
    The knowledge of sediment transport in the coastal region is of vital importance to the management of this critical interface between land and sea, where most of the world population lives. For the assessment of sediment behaviour, hydraulic and sediment measurements, bathymetric survey, mathematical and physical models, are applied. Sediment tracers provide a unique capability for understanding sediment transport assisting in sediment management which cannot be obtained any other way, whether conventional monitoring or physical and numerical models because tracers integrate all the hydrodynamic actions in time and space. Computational fluid dynamics (CFD) is now an essential tool for the management of the natural systems and is increasingly used to study the fate and behaviour of particulates and contaminants. Tracer techniques are often employed to validate hydrodynamic models to enhance confidence in the predictive value of the models. In-situ detection afforded by the use of a radioactive tracer allows accurate quantitative determination of the rate of sediment transport, compared with other tracer methods. Also, it is cost effective and safe: its radiological impact to the environment is minimal. Several case studies, performed in different regions of the world, are presented. 2014, Springer International Switzerland.
  • Thumbnail Image
    Item
    Radiotracer applications: case studies from four continents
    (International Atomic Energy Agency, 2015-01-01) Jung, SH; Bandeira, JV; Brisset, P; Wörman, A; Airey, PL; Hughes, CE
    Case studies are a simple way to demonstrate how radiotracers can be successfully used in the environment in addressing water resources contaminant transport and coastal management issues. This paper presents ten case studies from Korea, France, Brazil, Hong Kong, Australia, Belgium and Sweden using a variety of radiotracers including 99mTc, 198Au, 3H, 82Br, 32P, 175+181Hf, 160Tb, 51Cr(III), 65Zn, 54Mn and 35S. These studies address physical transport processes such as dispersion and mixing, reactive transport and adsorption and contaminant uptake. Traced components include water, effluent, nutrients, contaminants and mud in rivers, lakes, wetlands and coastal waters.