利用气象地温资料反演大地热流

利用气象台记录的深度为0.8m,1.6m和3.2m的月平均地温资料,进行Fourier频谱分析,得到定常波和子谐波（变化波）两部分.同时取地表以下为水平分层的均匀双层介质,建立数学模型,根据线性热传导和最优化理论对定常波以及子谐波的振幅谱和相位谱进行联合反演,计算气象台地表附近的定常地温梯度以及地表土壤的热扩散系数等物性参数,并据此计算该地的大地热流值.初步计算结果表明,上述方法得到的某些地区的大地热流值与传统的通过钻孔测量法得到的大地热流值符合得相当好.

CALCULATION OF HEAT FLOW FROM METEOROLOGICAL DATA

In this paper, Fourier transformation is applied to the analysis of long-term meteorological data of subsurface temperature, Fourier coefficient of both the constant term and the harmonic terms are obtained. A two-layered thermal model is developed to analyze the variation of subsurface temperature with depth and time. Based on optimization theory, inverse is made to get both the regional heat flow and the subsurface harmonic geothermal waves. As an example, the method provides stable and rapidly convergent solutions of heat flow and other geothermal parameters in Huailai county area, Hebei province.It is found that the computational results of regional heat flow are consistent with borehole heat flow measurement.