摘要
为查明2004年和2005年夏季在中印边界附近发生的滑坡堰塞湖溃坝灾害,采用高分辨率为主的多时相卫星图像和"数字滑坡"技术对帕里河中段从形成堰塞湖到溃坝的整个过程进行了监测。监测结果表明位于喜马拉雅山脉西段的帕里湖为高原山地萎缩湖盆,滑坡筑坝形成堰塞湖至溃坝可分为4个阶段,估算溃坝前湖面的最大高程、最大面积和最大水量分别达3907m、1.75km2和6144×104m3,2005-06-26溃坝的下泄洪水量为3738×104m3。预测未来汛期帕里湖下游仍然存在崩塌滑坡活动及短暂堵江形成堰塞湖的可能性,但其规模将大多小于2004～2005年的灾害。在本次遥感监测的基础上,定期进行遥感监测,当帕里湖水面面积≥1.6km2时,即通知下游作好撤离等避灾准备,是目前最经济有效的预警防灾措施。
for investigating the disaster occurred near the boundary of China-India in Summer 2004 - 2004, taking multi temporal high resolution satellite data as the main information resources and adopting ＂Digital Landslide Technique＂ the process from the Barrier Lake formed to burst in the middle reach of the Pali river Tibet have been monitoring. The monitoring results show the Pali lake is an atrophic lake basin in Qinghai-Xizang Plateau Mountain, the process can be divided into 4 steps. The highest level, largest water area and biggest impoundment of the barrier lake before bursting are estimated are 3 907 m, 1.75 km^2 and 6 144×10^4 m^3, and the burst flood is calculated as 3 738×10^4 m^3. It is forecast that rock fall and landslide activities distributed in the lower reach of the lake will occur and blockage the river channel at any time of the rain season, but their scales would be smaller than the disaster occurred in 2004 - 2005. Routine remote sensing monitoring will be the most reasonable and effective measures for disaster pre-warning in this high mountain narrow canyon area of the Himalaya, that while the water surface ≥ 1. 6 km^2, the villager lived in the lower reach will be immediately informed and asked doing something to avoid disaster.
出处
《山地学报》
CSCD
北大核心
2009年第2期240-247,共8页
Mountain Research
关键词
帕里湖
卫星遥感监测
数字滑坡技术
堰塞湖溃坝
灾害
the Pali lake satellite monitoring
digital landslide technique
Barrier Lake bursting disaster
