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热惯量法在土壤水分反演中有着广泛的应用。以MODIS数据为基础,选用真实热惯量模型,反演得到了黑河流域的土壤热惯量,为进一步研究流域土壤水分提供可靠的方法和数据。利用地面实测数据对模型参数及反演结果进行了验证,并分析了地表昼夜最大温差、地表反照率及土壤热惯量的季节性变化规律,同时对比了真实热惯量模型与表观热惯量模型反演结果与土壤水分的相关性。结果表明:地表温差、地表反照率及土壤热惯量都具有明显的季节性变化特征;真实热惯量模型相对于表观热惯量模型更有利于土壤水分的反演,且具有广泛的适用性。
Thermal inertia method in soil moisture inversion has a wide range of applications. Based on MODIS data, the thermal inertia of the soil in the Heihe River basin was obtained by inversion using the real thermal inertia model, which provided a reliable method and data for further study on the soil moisture in the basin. The model parameters and inversion results were validated by using the measured data from the ground. The seasonal variations of the diurnal maximum temperature difference, the surface albedo and the soil thermal inertia were analyzed. Meanwhile, the real thermal inertia model and the apparent thermal inertia model were compared Correlation between the results and soil moisture. The results show that the surface temperature, surface albedo and soil thermal inertia have obvious seasonal variation characteristics. Compared with the apparent thermal inertia model, the real thermal inertia model is more conducive to the retrieval of soil moisture, and has a wide range of applicability.