Last edited by Kikinos
Sunday, July 19, 2020 | History

3 edition of Subsidence prediction in New Zealand geothermal fields found in the catalog.

Subsidence prediction in New Zealand geothermal fields

R. G. Allis

Subsidence prediction in New Zealand geothermal fields

by R. G. Allis

  • 262 Want to read
  • 27 Currently reading

Published by Institute of Geological & Nuclear Sciences Limited in Lower Hutt, N.Z .
Written in English

    Subjects:
  • Subsidences (Earth movements),
  • Geothermal resources -- New Zealand.,
  • Geothermal engineering -- New Zealand.,
  • Geology -- New Zealand.

  • Edition Notes

    StatementR.G. Allis, X. Zhan.
    SeriesInstitute of Geological & Nuclear Sciences science report -- 98/8, Institute of Geological & Nuclear Sciences science report -- 98/8.
    ContributionsZhan, X., Institute of Geological & Nuclear Sciences Limited.
    Classifications
    LC ClassificationsQE600.3.N48 A45 1998
    The Physical Object
    Pagination1 v. in various pagings :
    ID Numbers
    Open LibraryOL19589859M
    ISBN 100478096186
    OCLC/WorldCa50752396

    geothermal fields’ location and size are relatively well-known, in comparison with other forms of renewables such as wind or marine. These reports have been gathered and analysed to produce short and long term forecasts of New Zealand’s geothermal generation. From this study, it was found that New Zealand has abundant geothermal resources. Geothermal Resource Management /70s - Geothermal investigations by government Resource Management Act - Use and allocation Late s – partial privatisation of energy companies Regulated by Regional Councils – 75% in Waikato Region National perspective: • Geothermal is defined in law as a renewable resource • Gov’t target – 90% of NZ’s electricity from .

    New Zealand’s largest geothermal plant is now up and running, and better than advertised. After nearly three years of construction with zero lost-time injuries, Te Ahi O Maui geothermal plant came online in October and will deliver at least 24 megawatts of electricity (MWe), and likely The Ngawha geothermal field is located approximately 5 km east of Kaikohe. It covers an area of between 25 to 50 km2, and is the only high temperature geothermal field in New Zealand outside of the Taupo Volcanic Zone. Figure 1: Map of Ngawha geothermal field. The geothermal field lies within a small topographic basin and is centred on the town of.

    In New Zealand, Wairakei and Broadlands geothermal fields are examples of geothermal systems that are being exploited for power production. Wairakei is an example of a liquid-dominated hydrothermal field and hot water and steam are extracted. New Zealand Botanical Society Newsletter Burns BR Vegetation change along a geothermal stress gradient at the Te Kopia steamfield. Journal of the Royal Society of New Zealand Cody AD Geodiversity of geothermal fields in the Taupo Volcanic Zone DOC Research & Development Series Wellington, Department of.


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Subsidence prediction in New Zealand geothermal fields by R. G. Allis Download PDF EPUB FB2

Many geothermal fields, including The Geysers (Mossop & Segall ), Svartsengi (Eysteinsson ) and Cerro Prieto (Glowacka et al. ), but at rates that are typically an order of magnitude smaller than at Wairakei-Tauhara. Accordingly, little modelling or future prediction has been applied to geothermal subsidence outside of New by: 9.

The Tauhara geothermal field is located within the Taupo Volcanic Zone, New Zealand and has undergone subsidence in three localized areas referred to Author: Christopher Bromley.

Single-phase and two-phase geothermal reservoirs are currently being exploited for power production in Italy, Mexico, New Zealand, the United States, and elsewhere. Vertical ground displacements of up to m and horizontal ground displacements of up to m have been observed at Wairakei, New Zealand, that are clearly attributable to the.

F Civilini, M K Savage, J Townend, Shear wave velocity changes induced by earthquakes and rainfall at the Rotokawa and Ngatamariki geothermal fields, Taupō Volcanic Zone, New Zealand, Geophysical Journal International, /gji/ggz,1, (), ().Cited by: At Wairakei geothermal field in New Zealand, subsidence has occurred since the onset of production in the 's.

A good understanding of the stress-deformation behaviour of materials is important. The same explanation applies to the Ohaaki subsidence bowl, the Tauhara subsidence anomaly (Allis and Zhan, ), and possibly also to the subsidence area at Kawerau geothermal field (Allis, ).

Reasons for the high compressibility mudstone being restricted to a 1 km 2 area of the field are likely to be related to the proximity of this area.

New Zealand Geothermal Workshop Proceedings November Auckland, New Zealand GEOTECHNICAL INVESTIGATIONS OF SUBSIDENCE IN THE WAIRAKEI-TAUHARA GEOTHERMAL FIELD Graham Ramsay1,Trystan Glynn-Morris2, Michael Pender3 and Melvyn Griffiths4 1Beca Infrastructure Limited P O Box WellingtonNew Zealand @ In regard to geothermal subsidence, in as much as very limited field data is currently Stilwell, W.B., W.K.

Hall and J. Tawhai, Ground Movements in New Zealand Geothermal Fields, Proceedings of the Second United Nations Symposium on the Development and Use of Geothermal Resources, vol. 2, pp. May e c Q t. L, QI I. Abstract. Kawerau is located in the Bay of Plenty on the north-east coast of the North Island, New Zealand.

Kawerau is an active geothermal field where fluids have been extracted for energy use since the ’s when a pulp and paper mill was constructed due to the close proximity to forestry areas and the geothermal energy source.

Geothermal power in New Zealand is a small but significant part of the energy generation capacity of the country, providing approximately 17% of the country's electricity with installed capacity of over MW.

New Zealand, like only a small number of other countries worldwide, has numerous geothermal sites that could be developed for exploitation, and also boasts some of the earliest large.

Figure 1 shows the annual subsidence rate as meas- * Ministry of Works, Wairakei, New Zealand ured in (the pattern for other years has been sim- ilar). The maximum subsidence rate of approximately feet per annum suggests that the total subsidence to date exceeds 10.

This map shows the total subsidence, measured over almost 50 years, from to The contour interval is 1 metre. The greatest subsidence, up to 14 metres, is in the immediate area of the borefield.

A larger area has subsided by over a metre, indicating that extraction of geothermal fluid may affect a large area in the long term.

At five of these sites in California, Texas, and New Zealand, these predictions are compared to measured subsidence. Agreement between predicted and observed subsidence is good.

If field measurements of water-level fluctuations and the resulting time-dependent compression and expansion of geologic strata are locally available, use of a more.

Geothermal systems can be found in many parts of New Zealand, but mainly in the North Island. Information and locations of these geothermal fields can be found on the following websites.

New Zealand Geothermal Association (external link) Energy Efficiency and Conservation Authority (external link) GNS (external link) Waikato Regional Council.

geothermal projects. New Zealand is located in a volcanic region and is blessed with geothermal resources; as such, it started have caused various environmental problems such as land subsidence and the disappearance of geysers. To overcome these problems, New Zealand has developed a unique institutional framework for natural.

New Zealand’s geothermal resources have been used for many years. Geothermal areas are important to Māori, who use the heated waters for cooking, washing, bathing, warmth, preserving, ceremonial use and healing. Māori also use geothermal minerals as paints, wood preservatives and dyes.

In recent years, Māori have become significant players in the geothermal space with [ ]. The emissions factors for geothermal power stations in New Zealand for the calendar year are given in the table and figures below. These are the emissions of CO 2 (eq) released from the geothermal fluid during operation of the plant.

This geothermal area features a number of exhilarating mud pools, geysers and sulphur pools. View the stunning Champagne Pool or marvel at the force of the Lady Knox Geyser. Craters of the Moon.

The Craters of the Moon is a geothermal walk located just north of Taupo. The walk features mud craters that steam with geothermal activity. Whakarewarewa. Rotorua is a volcanic wonderland with extraordinary landscapes and incredible geothermal attractions - each with their own unique features, rare flora and fauna, and all rich in Maori history and folklore.

Sitting within the Pacific Rim of Fire, the region has one of the world’s most active geothermal fields. The legendary Pohutu Geyser in Te Puia, just five minutes from Rotorua city. Given its water chemistry, and its geology, the Ngawha geothermal field is quite different to other geothermal fields in New Zealand.

The earliest phase of geothermal exploration at Ngawha concluded in with one deep bore being drilled (NG1) (Gibson, ). The former Ministry of Works drilled more exploration deep wells from to.

Geothermal subsidence and land movement is a natural phenomenon in geothermal areas which can be exacerbated by operating geothermal generation facilities. Subsidence is caused by pressure decline in compressible geological formations, and has been observed in the Wairakei-Tauhara geothermal system since the early s.Just per cent of that came from geothermal energy - and around the same proportion came from non-renewable sources.

"New Zealand is using non-renewables at the same rate as geothermal, when.Geothermal areas record a noteworthy number of disasters, especially due to landslide and subsidence.

Therefore, a proper multi-risk assessment along the geothermal pipeline is required, particularly for these two types of hazard.

This is also to mention that the impact on human fatality and injury is not presently discussed here.