Borehole temperature array : installation at the Ruakura climate station site

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Atkinson, F.; Seward, A. 2014 Borehole temperature array : installation at the Ruakura climate station site. Lower Hutt, N.Z.: GNS Science. GNS Science report 2014/01 14 p.

Abstract: Long-term near-surface temperatures related to seasonal and diurnal variation are being studied by GNS Science (GNS) as part of the Low Enthalpy Geothermal Research Programme, to understand the effect of near-surface rock properties on efficiency of horizontal ground loops. Equipment was installed at the Raukura NIWA climate station site in Hamilton. The temperature sensors span a depth range of 0.05 to 9 m below ground surface level. Ten ECT soil/air temperature sensors attached to two EM50 data logger were installed at the site to record temperature measurements at 10 minute time intervals. Drilling and sensor installation work was carried out by Brown Brothers Drilling using a direct-push drilling method. The installation was completed successfully on 17th October 2013 to the target depth of 9 m. Core was not recovered during this drilling as previous core samples were collected from a site 1 m away and are assumed to be sufficient for geological record at the new drill site. The temperature data will be used to calculate thermal properties of the soil and monitor effects of climatic events. (auth)