中文摘要：

在气候变化的影响下,喀喇昆仑山叶尔羌河冰川突发洪水近几年频繁发生。2009-05—09,利用中国环境减灾卫星（HJ-1A/1B）影像,对叶尔羌河上游冰川突发洪水的源头进行了动态监测。在克亚吉尔冰川末端发现了冰川阻塞湖,并监测到其不断扩大。2009-08初该处冰川湖突然消失,同期影像显示其消失后,河谷中残留大量冰体,与往年情况差异巨大。结合相关水文记录及历史资料分析认为,极有可能是冰川末端突然前进（跃动）使冰川坝遭到破坏,导致冰川阻塞湖泄水。由此推测克亚吉尔冰川发生了罕见跃动现象,但需要进一步研究验证。

英文摘要：

Under the influence of climate and glacier changes,Glacier Lake Outburst Floods（GLOFs） occurred frequently in Yarkant River,Karakorum,China,in recent years.Using China Environment and Natural Disaster Monitoring Satellite images（HJ-1A/1B）,source of floods in upstream Yarkant River was under dynamic monitoring from May to September in 2009.During this period,an expanding ice-dammed lake was found in the glacier terminus of Kyagar.However,in early August the ice-dammed lake suddenly disappeared,leaving a large number of ices in the river valley.This phenomenon is significant different from previous years.Related hydrological records and analysis of historical data show a sudden advancing of glacier terminus damaged the ice dam,leading to the leak out of ice-dammed lake.The results suggested that infrequent glacier surging occurred in Kyagar glacier,and further monitoring will be conducted near future.