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针对尼泊尔4·25Gorkha地震诱发山地灾害的现象,基于多源光学遥感数据,使用目视解译方法分析了震前和震后地物特征的变化,调查了Rasuwa区影响抗震救灾的公路沿线滑坡、堰塞湖的空间分布。结果表明:本次地震新形成的大型滑坡较少,大部分为中小型滑坡、浅层滑坡及碎屑流、崩塌和落石等灾害,并有堰塞湖。而在影像上能清晰识别的灾害点有15处,其中3处危害较大,分别为Langtang滑坡、Resuo滑坡和1处堰塞湖。Langtang滑坡造成了严重的破坏。
According to the multi-source optical remote sensing data, this paper analyzes the changes of the features before and after the earthquake based on the multi-source optical remote sensing data, and investigates the landslides along the highway affected by the earthquake disaster in Rasuwa District, Barrier lake spatial distribution. The results show that there are few large landslides newly formed by this earthquake, most of them are small and medium-sized landslides, shallow landslides and debris flows, landslides and rockfalls, and dammed lakes. In the image can clearly identify the disaster points 15, of which three are more harmful, namely Langtang landslide, Resuo landslide and a barrier lake. Langtang landslide caused serious damage.