A short-lived flashflood in Rishi and Dhauli Ganga rivers on 7th February 2021, Uttarakhand Himalaya, killed 65 people with 141 reported missing (official estimate) and devastated two hydropower projects. Geomorphological observations supported by meteorological data suggest that the flood was triggered by a combination of avalanche and debris flow. The Dhauli Ganga valley has preserved ponded sedimentary sequences (laminated sand and silty-clay), suggesting that the valley is prone to episodic mega foods in the recent geological past. Considering that the receding glaciers in the higher Himalaya have left behind enormous sediment, unusual weather events are likely to generate such disasters more frequently as the climate becomes warmer. Thus, the study calls for not only incorporating the disaster risk assessment in the developmental planning of the Himalayan region but also recommends routine monitoring of the potential areas of structural failures in the glaciated valleys along with supra-glacial lakes.

2021年2月7日，在北阿坎德邦喜马拉雅山，Rishi和Dhauli Ganga河中发生了短暂的洪水，造成65人丧生，其中141人失踪（官方估计），并破坏了两个水电项目。气象数据支持的地貌观测表明，洪水是由雪崩和泥石流共同引发的。Dhauli Ganga山谷保留了池塘沉积序列（层积的沙子和粉质黏土），这表明该山谷在最近的地质历史中很容易出现大型食物。考虑到喜马拉雅山较高地区的后退冰川留下了巨大的沉积物，当气候变暖时，异常的天气事件可能会更频繁地引发此类灾害。因此，