Abstract
A heat flow probe, with which both temperature gradient and in situ thermal conductivity in sediments can be measured, is described. The relevant theory and design requirements are presented. Results of thermal conductivity measurements on sediments in Wellington Harbour are given and compared with values from a needle probe and from a standard divided bar apparatus. It is concluded that the accuracy of the in situ thermal conductivity measurement is comparable to that from the divided bar and that the instrument permits heat flow measurements to be made more reliably and conveniently than by any other method.