四川汶川“5.12”地震滑坡堰塞湖遥感监测分析

Using Remote Sensing Data to Monitor Landslide-dammed Lakes Caused by Wenchuan Earthquake

运用可见光、雷达和航片等不同空间分辨率的多源遥感数据,对四川汶川"5.12"地震灾区因地震诱发形成的大型堰塞湖进行了遥感监测,对堰塞湖发生的地点、数量以及空间分布规律进行了讨论。重点对唐家山堰塞湖进行了动态监测,提取了其堰塞湖回水长度、水面面积与水量等信息,并对这一结果进行了详细分析,为地震滑坡堰塞湖科学处置与减灾决策提供了科学依据。

There happened a scale of 8 on the Richter calculations earthquake in Wenchuan County, Sichuan Province on May 12^th of 2008. It caused a lot of landslides in Beiehuan County and many landslide-dammed lakes had been formed, some of the lakes are at very urgent risk of dam breaking and would threaten downstream people. Results of an investigation on landslide-dammed lakes are analyzed after Wenchuan earthquake using various types of remote sensing data including aerial, visual, and SAR satellite data. This paper discusses the general role of distribution and variation of landslide-dammed lakes. The dynamics of the Tangjiashan landslide-dammed Lake, which is the largest one, is analyzed in detail. Area changes of the Tangjiashan landslide-dammed lake in different periods, including the course length and the water surface area of inundated region are obtained from images between May 14^th and 26^th. The course length and the water surface area were about 7.39km and 1.14 km^2 on 14^th May, respectively. By 26th May, the course length and the water surface area reached 17.6km and 4. 09km^2, respectively. The results provided basic information for disaster reduction of the landslide-dammed lakes in this region.