不同水分条件下粗砂土剖面中目标物的GPR图像特征及其解译  

Ground Penetrating Radar Image Characteristics and Interpretation of Gritty Soil Under Different Water Conditions

作　　者：刘恒柏[1,2] 朱安宁[1] 张佳宝[1] 刘建立[1] 信秀丽[1,2] 

机构地区：[1]封丘农田生态系统国家试验站,土壤与农业可持续发展国家重点实验室(中国科学院南京土壤研究所),南京210008 [2]中国科学院研究生院,北京100049

出　　处：《土壤》2009年第1期112-117,共6页Soils

基　　金：国家自然科学基金项目(40571069);国家高技术研究发展计划(863)课题项目(2006AA10Z208);国家重点基础研究发展计划(973计划)项目(2005CB121103)资助

摘　　要：通过粗砂土人工土槽试验,研究了不同水分处理下土壤剖面中目标物探地雷达波形态特征的变化及其解译。结果表明,采用500MHz中心频率天线采集GPR数据,可以获取不同水分条件下粗砂土1m土体内介电性质异常的目标物较高分辨率的形态特征和位置信息数据;土壤含水量的增加会导致土壤中目标物界面反射信号强度减弱、双程走时增加以及目标物GPR图像形态特征的变化;在土壤性质、水分条件较均一的情况下,利用GPR数据通过时间-深度转换可以准确地确定目标物的埋藏深度。Based on ground penetrating radar practice on one gritty soil trough under different water disposals, the paper analyzed the variations of radar waveform characteristics. The results showed： using 500 MHz centre frequency antenna, we could get morphological characteristics and location of the dielectric anomaly object with well resolution in 1 m gritty soil pedon under different water treatments; the increase of soil moisture could decrease reflecting wave strength of the objects, lengthen two way travel time of the objects＇ reflecting wave, and accordingly influence ground penetrating radargram; ground penetrating radar could accurately detect the location and depth of uncharted object through time-depth conversion on the precondition of radar wave velocity accurately obtained under homogeneous soil texture and moisture.

关 键 词：探地雷达 粗砂土 土壤水分 解译 

分 类 号：S152[农业科学—土壤学]