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《Advances in Earth Science》 2011-06
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Structural Characteristics of the No.12 Glacier in Laohugou Valley,Qilian Mountain Based on the Ground Penetrating Radar Combined with FDTD Simulation

Wu Zhen1,Zhang Shiqiang1,Liu Shiyin1,Du Wentao(1,2)(1.State Key Laboratory of Cryospheric Science,Cold and Arid Regions Environmental and Engineering Research,Institute,Chinese Academy of Sciences,Lanzhou 730000,China;2.Qilian Mountain Station of Glaciology and Ecologic Environmental of State Key Laboratory of Cryospheric Science,Cold and Arid Regions Environmental and Engineering Research,Institute,Chinese Academy of Sciences,Lanzhou 730000,China)  
The use of ground penetration radar(GPR)for surveying glacial structure and ice thickness is a common method of monitoring glacial variation,but how to extract accurately the information and ice thickness is often more concerned about data interpretation.In this paper,we have run a Finite-Difference Time-Domain(FDTD) model that solves Maxwell′s equations in two dimensions,by comparison simulated image and the results of measured radar,and analyzed several reflection characteristics within several profiles,such as crevasses,melting cave,and temperate ice and so on.Comparison results show that GPR reflection image is affected by many factors,such as medium thickness,morphology,roughness and other factors as well in addition to dielectric constant.The survey result also shows that the ice-body temperature at Lao hugou valley No.12 glacier as polar continental glacier presents a higher trend.Meteorological and historical data indicate that the retreat and ablation of glaciers have been aggravated in recent years.Meanwhile,GPR combined with FDTD simulation provides good analytical tools for monitoring glacial variation along with climate change in our future.
【Fund】: 科技部基础性工作专项项目“中国冰川资源及其变化调查”(编号:2006FY110200);; 中国科学院知识创新工程重要方向项目“冰碛湖耦合关系及对冰碛湖溃决机理影响研究”(编号:KZCX2-YW-Q03-04);中国科学院知识创新工程项目“中国冰川资源及其变化调查”(编号:KZCX2-YW-GJ04)资助
【CateGory Index】: P343.6
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