雷达层析成像对复垦土壤分层结构的探测
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摘要
土壤层次是反映土地复垦质量的重要指标,传统的挖剖面测量方法费时费力,无法满足大范围土壤层次检测的需要。探地雷达是一种快速、无损、准确的地球物理探测技术,目前使用较多的反射法探测由于反射信号能量不足导致成像分辨率低。为解决上述问题,提出了探地雷达层析成像探测方法,建立了含原状土、粗砂、细土和细砂的复垦土壤分层数字模型,对选定的剖面进行模拟层析探测,采用最小平方正交二乘算法反演计算,以节省内存和计算时间。仿真结果表明,重建图像中不同介质区域之间的界线明显,计算结果和仿真模型的数据相吻合,证实了改进方法用于复垦土壤分层结构探测的可行性和有效性,为大范围土壤层次检测提供了新的思路。
Layer Structure is an important indicator of quality of reclamation soil. Digging profiles takes time and energy and cannot satisfy the demand of large-scale soil layer detection. Ground Penetrating Radar( GPR) is noncontact,quick and accurate. Insufficient reflected signal energy aquired by GPR using traditional reflection method leads to low resolution. Aiming at above problems,tomography technology can be used in GPR detection for layer structure of mine reclamation soil. The model consists of undisturbed soil,coarse sand,soil and fine sand,from bottom to top. Inversion equations were established after dissecting the detected profile,and Least Square QR-factorization( LSQR) was employed to solve the equations. Inversion results show agreement with model data,and the difference between layers is clear in the contour plots. This verifies that the radar tomography technology is practical for detection for layer structure of mine reclamation soil,and provides a new way to large-scale soil layer detection.
Layer Structure is an important indicator of quality of reclamation soil. Digging profiles takes time and energy and cannot satisfy the demand of large-scale soil layer detection. Ground Penetrating Radar( GPR) is noncontact,quick and accurate. Insufficient reflected signal energy aquired by GPR using traditional reflection method leads to low resolution. Aiming at above problems,tomography technology can be used in GPR detection for layer structure of mine reclamation soil. The model consists of undisturbed soil,coarse sand,soil and fine sand,from bottom to top. Inversion equations were established after dissecting the detected profile,and Least Square QR-factorization( LSQR) was employed to solve the equations. Inversion results show agreement with model data,and the difference between layers is clear in the contour plots. This verifies that the radar tomography technology is practical for detection for layer structure of mine reclamation soil,and provides a new way to large-scale soil layer detection.
引文
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[17]李玉喜,刘四新.跨孔层析成像四种算法的研究[J].中国地理物理,2009-2.
[2]E Gloaguen,M Chouteau,D Marcotte,R Chapuis.Estimation of hydraulic conductivity of an unconfined aquifer using cokriging of GPR and hydrostratigraphical data[J].JAG,47,2001:135-52.
[3]T Corin,I Couchard,B Dethy,L Haleux,A Montjoie,T Richter.Radar tomography applied to foundation in a karstic environment.Modern geophysics in engineering geology[M].Geol.Soc.Eng.,Geol.Spec.Publ,1997.
[4]G Bellefleur,M C Chouteau,P Sénéchal.Potentials pitfalls for amplitude inversion revealed by overlapping radar surveys[C].Proc.of GPR'2000,Gold Coast,Australia,2000:126-131.
[5]A P Annan,J D Redman,J A Pilon,E W Gilson,G B Johnston.Cross hole GPR for engineering and environmental applications[M].pulse EKKO Tech.Rep.,2000.
[6]J Boll,et al.Using ground-penetrating radar to detect layers in a sandy field soil[J].Geoderma,1996,70:117-132.
[7]J Doolittle,P Fletcher,J Turenne.Estimating the thickness and volume of organic materials in cranberry bogs[J].Soil Surv.Horiz,1990,31(3):73-78.
[8]S F Shih,J A Doolittle.Using radar to investigate organic soil thickness in the Florida Everglades[J].Soil Sci.1984,48:651-656.
[9]J A Doolittle,L E Asmussen.Ten years of applications of groundpenetrating radar by the United States Department of Agriculture[C].4th Int.Conf.Ground Penetrating Radar,1992,16:139-147.
[10]D L Mokma,et al.Ground-penetrating radar study of ortstein continuity in some Michigan Haplaquods[J].Soil Sci.Soc.1990,54:936-938.
[11]K W Farrish,J A Doolittle,E E Gamble.Loamy sub-strata and forest productivity of sandy glacial drift soils in Michigan[J].Soil Sci.1990,70:181-187.
[12]于景邨,等.煤矿深部开采中的地球物理技术现状及展望[J].地球物理学进展,2007,(2):586-592.
[13]李华,等.钻孔雷达层析成像技术的研究与应用[J].地球物理学进展,2010,(5):1863-1869.
[14]D Baumgardt,et.al.地震和地质雷达层析成像的地质地球物理模拟在环境中的应用[J].世界地震译丛,2001,(6):67-75.
[15]吕远,邵芸.含水含盐土壤的微波介电特性分析研究[J].遥感信息,2001,3:19-23.
[16]杨薇,刘四新,冯彦谦.跨孔层析成像LSQR算法研究[J].物探与化探,2008,(2):199-202.
[17]李玉喜,刘四新.跨孔层析成像四种算法的研究[J].中国地理物理,2009-2.
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