热惯量法在监测土壤表层水分变化中的研究

The Application of Thermal Inertia Method the Monitoring of Soil Moisture of North China Plain Based on NOAA-AVHRR Data

利用遥感方法监测一定层深土壤水分变化 ,关键是建立卫星数据与地表水热变化的关系。该文对遥感定量反演土壤水热变化的数值模拟系统及热惯量法在其边界、初始条件确定中所起的作用进行了简述 ,并介绍了热惯量法求解表层水分含量的发展概况。为进一步提高定量化监测方法的实时性及计算精度 ,该文发展了地表能量平衡方程的一种新的化简方法。经过这样的处理 ,可从遥感图象数据直接得到真实热惯量值 ,进而得到土壤水分含量分布。通过野外实验 ,我们对相关参量间关系进行确定 ,对热惯量方法的精度进行分析 ,认为此方法具有良好的计算精度。

After an introduction of the development and the trend of dynamic monitoring of the soil moisture based on the NOAA-AVHRR remote sensing data,the paper gives a full and particular account of soil moisture retrieving method Based on the study of energy exchange at airsoil interface,the parameters of thermal equation are divided into 3 parts:micrometeorological parameter,soil physical parameter and soil surface temperature parameter;from which an improved method of retrieving soil surface thermal inertia from satellite data is developed Results are given at the end of this paper