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通过分层控制土壤含水率,利用加拿大Pulse-EKKO探地雷达进行了土壤含水率与雷达信号属性的关系研究,重点探讨了不同土壤含水率对应的雷达振幅,讨论从雷达波形中提取反射系数并研究其与含水率的变化之间的关系。结果表明:探地雷达的振幅受到含水率变化的影响显著,含水率越高,振幅越小;上下两层土壤含水率的差值与其分界面处的反射系数存在线性关系,且含水率的差值越大,反射系数越大。最后指出,探地雷达信号属性确实能有效反映土壤含水率的信息,若能获取土壤表层的含水率信息,则可以运用本实验得出的关系推算得到地表以下雷达可测深度范围内各层土壤的含水率,因此利用探地雷达信号属性来定量研究土壤含水率的方法是可行的。
By stratified control of soil moisture content, using Canadian Pulse-EKKO GPR to study the relationship between soil moisture content and radar signal attributes, focusing on different soil moisture content of the corresponding radar amplitude, discuss the extraction of the reflection coefficient from the radar waveform and Study the relationship between water content and its change. The results show that the amplitude of ground penetrating radar is significantly affected by the change of water cut. The higher the water cut, the smaller the amplitude. The difference of soil water content of the upper and lower layers has a linear relationship with the reflection coefficient at the interface. The larger the value, the greater the reflection coefficient. Finally, it is pointed out that the signal properties of GPR can indeed effectively reflect the information of soil moisture content. If the information of moisture content of soil surface can be obtained, the soil depths within the measurable depth of radar below ground surface can be calculated by using the relations obtained in this experiment Therefore, it is feasible to use the GPR signal attributes to quantitatively study the soil moisture content.