Search Results: “” — Page 1

Steven E Pells, Philip J N Pells, William L. Peirson; Kurt Douglas and Robin Fell

The method of Annandale (1995) is widely used by Australian practitioners for the assessment of erosion in unlined spillways. This method is based on comparison to various case studies, where the geology at each site is characterised using the Kirsten index (a rock mass index previously developed to assess the rippability of rock), and the hydraulic conditions are characterised using the unit stream power dissipation. In this paper, the historical development of this comparative design technique is traced and is critically reviewed against the original geotechnical and hydraulic data, and against a new, independent, dataset gained from unlined spillways in fractured rock in Australia, South Africa and the USA. It is shown that, while erosion can be usefully correlated against rock-mass indices and hydraulic indices, this ‘comparative’ design technique has been promoted beyond its reach – the data do not support the inference of an erosion ‘threshold’ as presented by Annandale (1995). It is argued that this type of analysis should be used only as an initial ‘first indication of erosion potential’, as originally proposed by van Schalkwyk (1994b).
Keywords: scour; erosion; spillways.

Now showing all 6 search results

  • $15.00
    2015  Papers

    2015 – Erosion of unlined spillways in rock – does a ‘scour threshold’ exist?

    Learn more
    Learn more
  • $15.00
    2017  Papers

    2017 – Spillway Concrete Scour Detection and Repair at the Base of an 84m High Arch Dam

    Learn more
    Learn more
  • $15.00
    2018  Papers

    2018 – Localised Repairs of Spillway Concrete Scour at the Base of a 42 m High Arch Dam

    Learn more
    Learn more
  • $15.00
    2021  Papers

    2021 – Mundaring Weir, Stilling Basin and Outlet Works Risk Assessment

    Learn more
    Learn more
  • $15.00
    2008  Papers

    2008 – Application of procedures for estimation of rock erosion for overflow of dams – illustrated by application to Julius Dam, Queensland

    Learn more
    Learn more
  • $15.00
    2010  Papers

    2010 – A Unique and Holistic Approach to the Erodibility Assessment of Dam Foundations

    Learn more
    Learn more