祁连山老虎沟12号冰川冰下形态特征分析  

Structural Characteristics of the No.12 Glacier in Laohugou Valley,Qilian Mountain Based on the Ground Penetrating Radar Sounding

作　　者：武震[1] 刘时银[1] 张世强[1] 

机构地区：[1]中国科学院寒区旱区环境与工程研究所冰冻圈科学国家重点试验室,甘肃兰州730000

出　　处：《地球科学进展》2009年第10期1149-1158,共10页Advances in Earth Science

基　　金：中国科学院重要研究方向项目"西部冰川变化监测及其影响评估方法研究"(编号:KZCX2-yw-301);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);国家自然科学基金项目"典型海洋性冰川海螺沟冰川冰内及冰下水系演化示踪研究"(编号:40801030)资助

摘　　要：利用探地雷达对老虎沟12号冰川进行了多个剖面观测,分析了雷达图像反映的冰川内部特征。结果表明通过分析雷达图像中的纹理和位置,雷达波形的振幅和极性变化等信息能够有效的辅助识别冰川内部介质的变化界面位置和估算其规模。在老虎沟12号冰川的部分剖面内部存在冰内空洞、冰内融水空洞、冰下裂隙、冰下河等地貌形态,在冰岩界面和冰川边缘存在规模不等的碎屑层。这说明即使在典型的大陆型冰川,冰川内部结构也可能较为复杂,在冰岩界面处可能存在较强的冰川作用。The inner-structure of glacier was analyzed from the profile images of ground-penetrating radar at No. 12 Glacier in Laohugou Qilian Mountain western China. By calculating the difference of dielectric constants a- mong water, air, bedrock, debris and ice, integrated with changes in radar wave polarity and velocity, the geomor- phic character within the glacier was described and caves, caves with water, channels beneath the ice, the interface between glacier and bedrock were identified and positioned, with the comparison of wave patterns introduced in some literatures. The results suggest that there exist debris layers between ice-bedrock interfaces indicating that strong basal erosional processes may even prevail in certain part of a glacier of the continental characteristic, contrary to the early knowledge about this kind of glaciers.

关 键 词：探地雷达 祁连山 老虎沟12号冰川 冰下形态 岩屑层 

分 类 号：P512.4[天文地球—地质学]