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Journal Article

Waiwera: evolving understanding for management of a New Zealand shallow and low enthalpy geothermal system

Authors
/persons/resource/mkuehn

Kühn,  M.
3.4 Fluid Systems Modelling, 3.0 Geochemistry, Departments, GFZ Publication Database, GFZ Helmholtz Centre for Geosciences;

Viskovic,  Graham Paul D.
External Organizations;

/persons/resource/timshoe

Schöne,  Tim
3.4 Fluid Systems Modelling, 3.0 Geochemistry, Departments, GFZ Publication Database, GFZ Helmholtz Centre for Geosciences;

Präg,  Melissa
External Organizations;

Ribacki,  Charlotte
External Organizations;

/persons/resource/grableo

Leonard,  Grabow       
3.4 Fluid Systems Modelling, 3.0 Geochemistry, Departments, GFZ Publication Database, GFZ Helmholtz Centre for Geosciences;

/persons/resource/kempka

Kempka,  T.       
3.4 Fluid Systems Modelling, 3.0 Geochemistry, Departments, GFZ Publication Database, GFZ Helmholtz Centre for Geosciences;

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5037252.pdf
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Citation

Kühn, M., Viskovic, G. P. D., Schöne, T., Präg, M., Ribacki, C., Leonard, G., Kempka, T. (2025): Waiwera: evolving understanding for management of a New Zealand shallow and low enthalpy geothermal system. - Advances in Geosciences, 67, 91-100.
https://doi.org/10.5194/adgeo-67-91-2025


Cite as: https://gfzpublic.gfz.de/pubman/item/item_5037252
Abstract
Waiwera in New Zealand is a small coastal village with a 50 °C warm reservoir of 400 m thickness directly underneath. Hydrogeological models support water management by providing insights into sustainable extraction from the system. It is artesian and the geothermal water is of meteoric origin percolating down to sufficient depth getting heated. It rises through a fault zone into the shallow and leaky aquifer. Therein the geothermal water mixes with cold fresh groundwater and sea water. The aim of the presented study is to summarise the scientific work over the past decades and the knowledge and progress in process understanding. New radiocarbon dating shows the geothermal water entering the reservoir to be >20 000 years old and underlines the topography driven recharge model. Water management plans helped curbing overproduction. Most recently the springs have restarted discharging geothermal water on the beach.