Ground water investigation of a fractured basalt aquifer at Greenmount Landfill, Auckland, using downhole temperature measurements

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White, P.A. 1995 Ground water investigation of a fractured basalt aquifer at Greenmount Landfill, Auckland, using downhole temperature measurements . Lower Hutt: Institute of Geological & Nuclear Sciences Institute of Geological & Nuclear Sciences science report 95/02 36 p.

Abstract: Temperatures in the range of 16 degrees C to 36 degrees C were measured in the leachate and gas extraction wells within the Greenmount Landfill, Auckland. These temperatures are all higher than the mean annual temperature for Auckland city of 15.3 degrees C. Downhole temperatures measured in a series of wells around the Greenmount landfill were between 15.2 degrees and 19.7 degrees. Temperatures and vertical temperature gradients on the western and northern boundaries of the landfill were elevated relative to temperatures and temperature gradients on the eastern and southern boundaries of the landfill. Three mechanisms of heat transport to explain the observed temperature distribution were assessed. Insufficient data exists to determine whether a conductive only model or a convection only model or a combined conduction/convection model can best explain the observations. (auth)