基于地基合成孔径边坡雷达监测技术的卡若拉冰川变形规律研究

Study on deformation law of Karuola glacier based on monitoring technology of ground-based synthetic aperture radar for slope

为分析卡若拉冰川的稳定性情况,从而得出其变形基本规律,通过边坡雷达对卡若拉冰川在线监测147 d,基于合成孔径雷达差分干涉测量技术获取被测区域变形信息,采用无人机对卡若拉冰川东、西冰舌进行了航测,获取卡若拉冰川表面影像数据和数字高程模型,将SAR图像与地形数据进行几何映射三维匹配。结果表明:卡若拉冰川总体的变形形态呈条纹状,即较大变形带由下而上交替出现,东、西冰舌均有较大的变形值,且分布范围大;水文气象环境是影响卡若拉冰川变形的主控因素;重点监测区域1是相对危险区域,易发生局部小面积垮塌。将边坡雷达用于冰川监测在国内尚无先例,研究成果将有助于填补我国边坡雷达在冰川监测领域的空白,为后续研究冰川表面变形规律和机理积累宝贵经验。

In order to analyze the stability of Karuola glacier and obtain its basic deformation,the Karola glacier was monitored online by slope radar for 147 days,and the deformation information of the measured area was obtained based on the differential interferometry technology of synthetic aperture radar.The UAV was used to conduct aerial survey on the East and West ice tongues of the Karuola glacier to obtain the surface image data and digital elevation model of the Karuola glacier.Geometric mapping and 3 D matching of SAR image and terrain data are carried.The results show that:the overall deformation shape of the Karuola glacier was striped,that is,the large deformation zone appeared alternately from bottom to top,and the deformation values of the East ice tongue and the West ice tongue were large,and the distribution range was large.Hydrological and meteorological environment is the main controlling factor affecting the deformation of Karola glacier.Key monitoring area 1 is a relatively dangerous area,prone to local small-area collapse.However,the application of slope radar to glacier monitoring is the first try in China.Based on the above research results,it is helpful to fill the gap of slope radar in the field of glacier monitoring in China.Valuable experience has been accumulated for the follow-up study of the law and mechanism of glacier surface deformation.