摘要
为了快速、高效地探测中国西部地区土地整治后砂壤的物理特性,该研究使用探地雷达对砂壤进行探测,利用自回归移动平均(auto regressive and moving average,ARMA)功率谱估计方法处理数据,建立砂壤物理模型,分析对比不同含水率和紧实度砂壤的功率谱分布特征,分别建立与含水率和紧实度具有最优拟合度的关系模型。结果表明:在频率670 MHz时,低频功率谱能量占全部功率谱能量比值(L/(H+L))与砂壤含水率相关性最强,相关系数达0.952;频率为1 000 MHz时,高频功率谱能量占全部功率谱能量比值(H/(H+L))与紧实度倒数的相关性最强,相关系数达到0.947。通过实际探测验证,该模型可以获得连续、准确、高效的砂壤含水率和紧实度数据,为土地整治工程的质量检测提供技术支持。
In land reclamation project of western China, the sandy loam is very fragile for erosion in its ecosystem. The main purposes of the sandy loam soil remediation are the anti-desertification and the improvement of vegetation growth ability. Since water content of sandy loam soil and degree of compacting are two important physical parameters, which have great influences on the vegetation growth, a fast and accurate detection method is needed to determine these parameters. 〈br〉 In the land quality evaluation, the sampling method is important. The remote sensing method is based on big surface elements, which is not suitable for the micro examinations. The method of taking soil samples in the field and then oven-drying in the laboratory can yield good precision in the tests, but very inefficient and destructive to soil ecosystem. The other methods as Time Domain Reflectometry （TDR）,γ-ray, et al. have the common disadvantages of discontinuity and inaccuracy. The ground penetrating radar （GPR） technique with fast, convenient, precise and nondestructive characteristics is widely used in quality test of engineering projects. The GPR transmits and receives high-frequency electromagnetic waves through the antenna for the accomplishment of detections. This study focused on sandy loam soil collected from a research area in Inner Mongolia where the land consolidation project had just finished. The research started with sandy loam soil samples gathering from the research area. Then a wooden container was built, which was filled with sandy loam soil samples as a physical model. After calibrating water contents and degrees of compactness of the sample in the model, a GPR system with 900MHz antenna was then used for determining soil water content and compaction. The GPR hardware in this study was the‘GR’ radar system which was designed and built by China University of Coal Mining technology, Beijing. 〈br〉 The Cadzow analysis was used in the Auto-Regressive and Moving Average （ARMA） power spectral recognitio
出处
《农业工程学报》
EI
CAS
CSCD
北大核心
2014年第16期99-105,共7页
Transactions of the Chinese Society of Agricultural Engineering
基金
煤炭资源与安全开采国家重点实验室自主研究课题基金(2013CRSMZZ03)
关键词
雷达
含水率
功率谱
探地雷达
紧实度
radar
water content
power spectrum
ground penetrating radar （GPR）
degree of compactness
