【摘要】 为了快速、有效的测定复垦区农田尺度上土壤含水率变化以及空间分布特征,评价探地雷达对土壤含水率的探测精度,通过研究雷达信号属性振幅与土壤含水率的关系,采用振幅包络平均值（AEA）法对复垦区农田地块土壤含水率进行反演,并与雷达测线上时域反射仪（TDR）法测量所得土壤含水率结果进行对比。结果表明:探地雷达振幅信号属性与土壤含水率有着显著的关系,在研究的四种关系模型中对数模型的拟合结果最好,R²达到0.995,根据拟合的曲线得知,振幅越大,含水率越小,只要获取地下相应位置雷达信号的振幅值,就可通过本试验拟合的关系式计算出该位置的土壤含水率。通过对比发现,AEA法所得土壤含水率要高于TDR法所测土壤含水率,两者平均相对误差为0.023 cm³cm^-3,两种方法所得土壤含水率变化趋势基本一致,相关系数达到0.98。研究表明,使用探地雷达AEA法用于黄土高原矿区复垦农田浅部地层土壤含水率的探测,可以获得更加连续、准确的土壤含水率分布图。更多还原

【Abstract】 In order to quickly and effectively determine the change in soil water content and the spatial distribution characteristics of farmland in reclamation areas, we evaluated the accuracy of ground penetrating radar in detecting the surface soil water content, and analyzed the relationship between amplitude of radar signal attributes and soil water content. The soil water content of field parcel in the reclamation areas was inverted by using the radar wave average envelope amplitude（AEA） method, and then was compared with that derived by time domain reflectometry（TDR）method on the radar survey line. The results showed that GPR early-time amplitude had a strong correlation with soil water content. Among the four relational models, the logarithmic model had the best fitting result with R² value of 0.995. According to the fitted curve, the greater the amplitude was, the smaller the water content was observed. If we obtained the amplitude value of the GPR signal at the corresponding position in the underground, the soil water content was calculated by the relational expressions which were found in the experiment. The soil water content obtained by AEA method was higher than that measured by TDR method, and the mean relative error of the two methods was 0.023 cm³ cm^-3. The AEA method got the similar soil water content with TDR method, and the correlation coefficient was 0.98. The results indicated that it is feasible to detect soil water content of the shallow stratum in reclamation farmland of mining area, the Loess Plateau, by using the method of early-time GPR signal AEA, which can get a distribution map of soil water content for large area continuously and accurately.更多还原