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Home / Bay of Plenty Times

Western Bay District Council invests in Omokoroa landslide research

Bay of Plenty Times
2 Nov, 2017 10:16 PM2 mins to read

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Francesca Spinardi and Tom Robertson will be working on the Omokoroa landslide research project. Photo/Supplied

Francesca Spinardi and Tom Robertson will be working on the Omokoroa landslide research project. Photo/Supplied

Research into why Omokoroa cliffs are prone to slips is getting a financial boost.

The Western Bay of Plenty District Council will contribute funds over the next three years towards Omokoroa landslide research, with University of Waikato Doctoral students believing they might have found a way to stabilise the sensitive soils and reduce the number of landslides.

The Council will contribute $10,000 annually over the next three years towards a University of Waikato Doctoral Research Project on Omokoroa's geology, centred on soil stabilisation.

Omokoroa landslide. Photo/ Sonya Bateson
Omokoroa landslide. Photo/ Sonya Bateson

The project, led by Earth Sciences senior lecturer Dr Vicki Moon and undertaken by doctoral student Tom Robertson, is focused on discovering how to improve the stability of the material in the sensitive soils that make Omokoroa's peninsula cliffs prone to slippage.

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Dr Moon and her colleague Dr Willem de Lange, presented an update of their research to Council's operations committee this week.

The team has been studying Omokoroa's landslides since 2009, focusing on the Bramley Drive landslide that occurred in 1979.

Dr Moon said their attention was on the failure of the sensitive soils at the base of landslides.

Dr Moon said initial laboratory testing showed huge promise with a big uptake of the salt and a near-doubling of the peak strength of the soil. However, more testing is required over a wide range of stresses to confirm the early results.

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A small field trial in Omokoroa will be carried out when possible to install soil-mixed columns and monitor how quickly concentrations of the salt can be achieved.

On-site research has been stalled since Cyclone Debbie caused further slippages in April this year, making the cliff sites unsafe for researchers.

The Omokoroa Bramley slip. Photo/Supplied
The Omokoroa Bramley slip. Photo/Supplied

Omokoroa has two types of landslides

Translational and flow slides - the most damaging are the flow slides due to the fragility of the sensitive soils. These soils are mainly made up of halloysite - a mineral that forms in old volcanic ashes typical to Omokoroa.

The latest findings of the research project indicate a form of salt can act as a stabiliser in halloysite-rich soils by 'locking up' the soils over a period of time.

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