基于时序像素跟踪算法的南伊内里切克冰川运动提取与特征分析

选用Sentinel-1A卫星TOPS模式下获取的8景升轨SAR数据,基于小基线集像素跟踪时序分析技术（Small BAseline Subset Pixel Tracking technique, SBAS-PT）,获取了南伊内里切克冰川2018年1月至2018年12月期间不同时段的表面流速分布及其时空变化特征。研究结果表明：2018年南伊内里切克冰川1月到3月整体运动速率较小,从4月起速率明显增加,7月到8月达到最高,9月份起运动速率开始放缓,10月到12月期间冰川表面运动速率较小,全年的平均表面流速约为30cm·d^-1。总体而言,南伊内里切克冰川中上游区域流速明显高于冰川下游,冰川下游冰川物质消融减薄和补给量减少以及表碛物增多等因素致使冰川末端区域逐渐趋于稳定。

South Inylchek Glacier Surface Motion Extraction and Analysis based on Time-series Pixel Tracking Algorithm

The 8 scenes SAR imagery acquired by Sentinel-1A satellite in TOPS mode are employed in surface motion extraction and analysis of South Inylchek Glacier during period from January to December in 2018 with Small Baseline Subset Pixel Tracking Technique （SBAS-PT）, which could overcome the limit of the temporal incoherence. The results show that its overall movement rate is relatively small during period from January to March. The ice motion increased significantly since April and reached the maximum during period between July and August, then the movement rate began to slow down from September. And the ice motion became slow again during the period between October and December. The average surface velocity of the whole year is about 30 cm·d^-1. In general, the ice motion rate in the upstream part of South Inylchek Glacier is significantly higher than that in the lower part of the glaciers. Both the reduction of the ice material supplement and the increase of moraine on glacier surface have made the ice gradually become to be stable in downstream part of the glacier.