Friday, 19 December 2014
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Tsunami generator copies wave behaviour

A unique wave-generating machine that mimics the activity of real-life tsunamis with unprecedented realism has been used successfully in an Oxfordshire laboratory.

The simulator has copied the behaviour of the first massive wave of the 2004 Boxing Day tsunami.

Developed and built with Engineering and Physical Sciences Research Council (EPSRC) funding, the tsunami generator will improve understanding of how tsunamis behave. This will aid the development of more effective evacuation guidelines for parts of the world potentially at risk from future tsunamis. It will also help improve the design of buildings in susceptible areas so they are better able to withstand the impact of such events.

The new facility has been developed jointly by EPICENTRE (the Earthquake and People Interaction Centre), based at University College London (UCL), and consulting engineering company HR Wallingford, at whose headquarters it is located.

Mounted in a 45m-long wave channel, the tsunami generator uses a pneumatic system to suck up water into a tank and then release it in a controlled way. This makes the facility fundamentally different from all other wave simulators worldwide, which generally use pistons to produce waves.

The new pneumatic technique has a range of advantages over a piston-based approach. In particular, tests by UCL researchers at HR Wallingford have shown that it can reproduce the draw-down phenomenon that is characteristic of ’trough-led’ tsunamis, where the sea is sucked out first before rushing back towards the shoreline.

Within the wave channel, or ’flume’, the waves created by the tsunami generator are directed over a model coastal slope, enabling their behaviour and effects to be studied in detail.

Specifically, tests with this facility will be used to enhance understanding of the water flows and forces unleashed by tsunamis. This will enable buildings and infrastructure in vulnerable parts of the world to be designed and built in ways that help them withstand these destructive events.

Moreover, because this understanding will make it easier to predict the behaviour of tsunamis at shorelines and when they move inland, the tsunami generator will make it possible to strengthen emergency and contingency planning at a regional, national and individual community level.

’Although the basic concept is actually quite simple, this is the only facility that has ever been able to replicate the draw-down phenomenon in the laboratory,’ said Dr Tiziana Rossetto, EPICENTRE’s director.

’We’ve already used the generator to mimic the 2004 Indian Ocean tsunami at a 1:75 scale. The data gathered should be validated and then made available to the scientific community within the next two years.’

The tsunami generator was designed, built and tested between 2007 and 2009. EPSRC support was supplemented by additional funding from HR Wallingford and a studentship supported by consulting engineering company Arup.

The aim is to make the tsunami generator available for use by other researchers from all over the world.

Tsunami Generator before being lowered into the flume. The waffles (the horizontal blue bars) stop sloshing inside the tank which gives better control of the generation of the wave

The tsunami generator before being lowered into the flume. The waffles (the horizontal blue bars) stop sloshing inside the tank, which gives better control of the generation of the wave

 


Readers' comments (4)

  • This type of work was being done at Stanford University in mid-1960s under leadership of Dr. Robert L. Street.

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  • Generically this type of work has been done before. However, considering the better data feedback from actual sites both in quantum and resolution is expected to provide a much improved validation. Hence output for the end user is expected to be better ,faster.

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  • If available I would like to introduce all the related customers in our market Korea..Could I get the price information with specifications, brocures or photos.
    Thank you.
    Haekeon Corporation
    CPO Box 6472 Seoul South korea

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  • I am sure a number of academics will tell us that they've already done this, but the truth is that never before has a major international hydraulics laboratory created a wave maker that can generate both the very long wavelengthsof a tusnami, and create leading "trough" waves. Details have already been given in papers to the "Breakwaters" conference, Beijing and Turkish Earthquakes Conference and other places. Naysayers are welcome to come and use the machine to run their own experiments.

    William Allsop
    Technical Director, HR Wallingford;
    Visiting Professor, University of Southampton.

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