Abstract The estimation of ground thermal conductivity using indicator kriging and surrounding borehole data at 5-m intervals to a depth of 200 m on regular 0.5-km cells of Japan was demonstrated. The probabilities of occurrence of eight soil/rock types were estimated for their most likely thicknesses and used as weights for estimation of ground thermal conductivity. Individual thermal conductivity of each soil/rock type is determined to obtain sufficient agreements of ground thermal conductivities between estimates and in-situ measurements. The estimation was performed over the land with 46 thousand borehole data. Local maps of Kanto showed the relation of soil/rock types and ground thermal conductivities with five topographic categories. Averaged 10-km-cell maps of Japan indicated the sudden changes of ground thermal conductivity even among adjacent cells due to geologic complexity. Vertical increases of ground thermal conductivity were statistically observed in all topographic categories, and the vertical profile of each location followed a logarithmic curve without or with a peak.

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通过指示克里金法估算地热导率：日本的国家级应用和垂直剖面分析

摘要 证明了使用指示克里金法和周围钻孔数据在日本常规 0.5 公里单元上以 5 米为间隔到 200 米深的地面热导率估计。8 种土壤/岩石类型的发生概率被估计为它们最可能的厚度，并用作估计地热导率的权重。确定每种土壤/岩石类型的单独热导率，以获得估算值和原位测量值之间的地面热导率的充分一致性。估计是在陆地上进行的，有 46,000 个钻孔数据。关东的当地地图显示了土壤/岩石类型和地面热导率与五个地形类别的关系。日本的平均 10 公里单元图表明，由于地质复杂性，即使相邻单元之间的地面热导率也发生了突然变化。在所有地形类别中统计地观察到地面热导率的垂直增加，并且每个位置的垂直剖面遵循对数曲线，没有或有峰值。