A ground-based and heliborne survey was conducted immediately after the disaster that took place on 7^th February, 2021 in the Chamoli district of Uttarakhand. Based on these observations and freely available Google Earth imagery, we have arrived at plausible causes of this catastrophe as detachment of a sizeable rock mass and overlying hanging glacier in the Raunthi catchment that dammed the Rishiganga River and led to the devastation of roads, bridges and hydropower projects in downstream.

中文翻译：

---

印度Garhwal喜马拉雅山Nanda Devi生物圈保护区的Rishiganga-Dhauliganga山洪暴发的透视

2021年2月7^日，在北阿坎德邦乔莫利地区的灾难发生后，立即进行了陆基和直升机降落调查。根据这些观察结果和可免费获得的Google Earth图像，我们已经找到了造成这一灾难的合理原因，原因是大批岩体的分离和Raunthi集水区上悬的悬垂冰川，这些堤坝挡住了Rishiganga河并导致道路，桥梁和下游水电项目。