Unstable hanging glaciers on steep mountain slopes pose serious risks. A new study focusing on the Central Himalayas highlights the dangers these glaciers present, especially to communities below.
Researchers from major Indian institutions studied the Alaknanda basin in Uttarakhand, a key region that feeds the Ganga River. They found that rapid development in high-altitude areas has increased human exposure to these glaciers, which cling to valley walls and can break apart suddenly.
The study identified 219 hanging glaciers, covering around 72 square kilometers, with an ice volume of about 2.39 cubic kilometers. Alarmingly, nearly one-third of these glaciers are unstable, meaning they could collapse at any moment.
Rising Temperatures and Accelerated Retreat
According to the study, glaciers in the Himalayas are warming faster than the global average. This increase in temperature has led to the retreat of these glaciers, destabilizing them. As they melt, they can trigger avalanches, which become dangerous when they occur near populated areas.
The Alaknanda basin is particularly vulnerable, with elevations ranging from 400 to 7,800 meters. It’s not just a natural wonder; it’s filled with towns, roads, and pilgrimage routes like Badrinath and Kedarnath, making it densely populated and geologically fragile.
Potential Devastation Ahead
Using advanced technology like satellite imagery and simulations, researchers projected the reach and impact of potential ice avalanches. Worst-case scenarios suggest that these avalanches could reach major settlements, including Mana and Badrinath. Some areas could see avalanche debris piling up to 50 meters high, which could block rivers and form unstable lakes, resulting in catastrophic floods downstream.
Recent history shows just how real these threats are. The 2021 Chamoli disaster, caused by glacier-related collapses, led to severe damage, emphasizing the urgency of monitoring these precarious ice forms.
A Spiking Population at Risk
The study revealed a troubling trend: areas at risk from glacier-related disasters are rapidly expanding. Built-up areas have grown from 8,000 square meters in 2000 to a projected 150,000 square meters by 2030. The population in these vulnerable regions could increase from fewer than 400 to over 8,500 in the same period.
This growth is especially pronounced along the Badrinath-Mana stretch, where infrastructure increasingly creeps closer to glacier slopes, putting more lives at risk.
Not All Glaciers Are Equal
Importantly, not every hanging glacier poses the same threat. Some are positioned safely away from populated areas, while others are directly above towns and rivers. A collapse from these could have devastating consequences.
The study notes a critical gap in monitoring these glaciers in the Himalayas compared to regions like the Alps, where advanced radar systems and early-warning mechanisms are in place. Researchers stress the need for targeted monitoring in high-risk areas. Identifying the most dangerous glaciers and allocating resources effectively could help mitigate future risks.
In summary, as climate change accelerates, the stability of hanging glaciers becomes even more crucial for the safety of communities in the Himalayas. Understanding their dynamics can help prepare for the potential dangers ahead. For further details, you can explore the research published in npj Natural Hazards.
Source link
unstable hanging glaciers study,study on Central Himalaya hanging glaciers,hanging glaciers risk Central Himalayas
