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首页> 外文会议>23rd New Zealand Geothermal Workshop 2001, 2001, Auckland >THERMAL PROPERTIES OF STEAMING GROUND (WAIRAKEI FIELD, NZ)
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THERMAL PROPERTIES OF STEAMING GROUND (WAIRAKEI FIELD, NZ)

机译：地热的热学性质（新西兰瓦拉基油田）

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摘要

Shallow temperature monitoring and soil sampling in areas of steaming ground at Wairakei and Tauhara have revealed that the thermal diffusivity of these pumice soils averages about 0.4 E-6 m~2/s. The thermal conductivity varies between 0.4 and 1.4 W/mK, in response to variations in moisture content of 100 to 700 kg/m~3. Vertical temperature gradients, and therefore conductive heat losses, are linearly related to the temperature above ambient, by a factor that decreases with depth. Convective heat transfer dominates above about 70℃. Twice-daily temperature pulses rising towards the surface are triggered by steam from subsurface boiling caused by periodic pressure waves originating in the upper atmosphere. These merge with downward pulses of diurnal solar heating, complicating the assessment of soil diffusivity.
机译：怀拉基和陶哈拉气田的浅层温度监测和土壤采样表明，这些浮石土壤的热扩散率平均约为0.4 E-6 m〜2 / s。响应于水分含量在100至700 kg / m〜3之间的变化，热导率在0.4至1.4 W / mK之间变化。垂直温度梯度以及因此的传导性热损失与环境温度以上呈线性关系，其系数随深度而减小。在约70℃以上，对流传热占主导。地下表面沸腾的蒸汽触发了每天两次向表面上升的温度脉冲，地下蒸汽是由高层大气发出的周期性压力波引起的。这些与日间太阳加热的下降脉冲合并，使土壤扩散系数的评估变得复杂。

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