应用SAR特征匹配方法估计音苏盖提冰川表面流速

Using Feature-Tracking of ALOS PALSAR Images to Acquire the Yengisogat Glacier Surface Velocities

喀喇昆仑山区冰川因位于高海拔地区且远离人类正常活动的区域,使得连续的表面流速的地面观测很难实施,因此,对该区域冰川运动机理研究相对比较少.采用日本高级陆地观测卫星携带的相控阵型L波段合成孔径雷达(Advanced Land Observing Satellite,Phase Array L-band Synthetic Aper-ture Radar,ALOS PALSAR)特征匹配方法(Feature-Tracking)获取了音苏盖提冰川的季节表面流速,并对误差进行了分析.结果表明:季节和年均表面流速分布图上都存在两条明显快速运动的冰流;南分支冰川-斯嘎姆里冰川(Skamri Glacier)夏季的流速大于其他季节,冰流横截面流速特征表明,该分支存在明显的块体运动现象,很可能正处于跃动期.

In this paper,the surface velocities of Yengisogat Glacier in the Karakoram were acquired using Feature-Tracking of the Japan Advanced Land Observing Satellite（ALOS） Phased Array type L-band Synthetic Aperture Radar（PALSAR） images.Four pairs of ALOS PALSAR images were processed and then the annual average velocities were calculated.The accuracy of calculation was discussed,and the results were compared with the previous measurements and found that they are well consistent.Two fast moving glacier flows are found.From the glacier surface flow velocity field,one can see that the south tributary（Skamri Glacier） contributes to the main flow of the glacier more in summer and were putting the glacier trunk forward.The features of the transverse profile velocity exhibit that the south tributary had evident block slide,which is an important sign of surging.The reason is probably the glacier response to precipitation increasing in winter and temperature decreasing in summer.