Temperature Survey in 5m Holes Across the Whitford Warm Water Prospect (South Auckland)

Abstract

Constant temperature gradients have been observed in deeper wells which penetrate the almost m thick Tertiary cover at Whitford. The gradients vary between 0.02 and An attempt has been made to obtain the undisturbed near-surface gradient from repeated temperature measurement in a series of shallow, 5 m deep holes, allowing for an iterative reduction procedure described by Risk and Hochstein (1973).Results show that representativenear-surfacetemperature gradientscan be obtained which, together with best fit values of the mean thermal diffusivity, allow an assessmentof the vertical heat flux at shallow depths.