Consider a region with average surface temperature T0 = 10

Consider a region with average surface temperature T0 = 10 C, annual fluctuations of ΔT = 30 C, and surface soil with a ≅ 2.4 × 10−7 m2/s, k ≅ 0.3W/mK. If the local upward heat flux from geothermal sources is 80mW/m2, compute the depth at which the heat flux from surface fluctuations is comparable. What is the answer if the area is geo thermally active and has a geothermal heat flux of 160mW/m2?

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