You are here:
RAO Home > Travel > Bhutan > Overview > Nature > Glaciers > Lunana's glaciers
Bhutan's nature
Global Warming
Bhutan's glaciers and glacial lakes
RAOnline Bhutan Site map Search RAOnline
Bhutan's Glaciers
Bhutan's Glaciers
Natural hazards Reports
previous pageend
Lakes in Lunana with high GLOF (glacial lake outburst flood) risks
Glacial Lake Outburst Floods (GLOF)

Nevertheless, experts say money is needed urgently to carry out similar work on scores of other glacial lakes if catastrophes are to be averted. "Part of our work is to help the governments of Nepal and Bhutan find and focus on potentially dangerous lakes, develop early warning systems, be able to warn communities of an impending Glacial Lake Outburst Flood (GLOF), and to carry out engineering works to reduce the threats. Some donor country governments are backing our efforts but much more aid is needed. Solving this problem is going to be costly because glacial lakes are situated in remote areas which are difficult to reach," said Mr Shrestha.

Surendra Shrestha, Regional Coordinator in Asia for UNEP's Division of Early Warning and Assessment, said: "Our findings indicate that 20 glacial lakes in Nepal and 24 in Bhutan have become potentially dangerous as a result of climate change. We have evidence that anyone of these could, unless urgent action is taken, burst its banks in five to 10 years time with potentially catastrophic results for people and property hundreds of kilometres downstream. These are the ones we know about. Who knows how many others, elsewhere in the Himalayas and across the world, are in a similar critical state?"

Nevertheless, experts say money is needed urgently to carry out similar work on scores of other glacial lakes if catastrophes are to be averted. "Part of our work is to help the governments of Nepal and Bhutan find and focus on potentially dangerous lakes, develop early warning systems, be able to warn communities of an impending Glacial Lake Outburst Flood (GLOF), and to carry out engineering works to reduce the threats. Some donor country governments are backing our efforts but much more aid is needed. Solving this problem is going to be costly because glacial lakes are situated in remote areas which are difficult to reach," said Mr Shrestha.

Klaus Toepfer, Executive Director of UNEP, said: "Mountains were once considered indomitable, unchanging and impregnable. But we are learning that they are as vulnerable as the world's oceans, grasslands and forests to environmental threats and insensitive, unfettered, development. Climate change is the biggest threat facing humankind with extreme weather events, droughts and rises in disease forecast for many parts of the globe over the coming decades". "The findings from our joint studies in the Himalayas, the roof of the world, reveals the extent of a new, and alarming, threat. It is not just the risk to human lives, agriculture and property that should worry us. Mountains are the world's water towers feeding the rivers and lakes upon which all life depends. If the glaciers continue to retreat at the rates being seen in places like the Himalayas, then many rivers and freshwater systems could run dry, threatening drinking water supplies as well as fisheries and wildlife. We now have another compelling reason to act to reduce emissions of carbon dioxide and other greenhouse gases," said Mr Toepfer.

Glacial Lake Outburst Floods (GLOFs) are not a new phenomenon but there is evidence that the frequency of such events has risen over the past three decades.

For example the Bhutan's Raphstreng Tsho glacial lake in the Pho Chhu River sub-basin measured 1.6 km long, 0.96 km wide and was 80 metres deep in 1986. The latest figures (1995) show the lake has swollen to be 1.94 km long, 1.13 km wide and has a depth of 107 metres. Its neighboring glacier could generate a GLOF up to two-and-a-half-times that which caused major devastation in October 1994. The 43 other glacial lakes, pin pointed in the survey and deemed to be in a dangerous state, show similar patterns

The filling of the lakes, and the threat of their mud and debris walls being breached, is as a result of rising temperatures melting the glaciers. Satellite, mapping and other surveys indicate that, for example, the glaciers in Bhutan are retreating at a rate of 30 to 40 metres a year

more

top

Information
Bhutan: Lunana's glaciers
Bhutan's glaciers are retreating
Raphstreng Tsho in Lunana
Bhutan's Glaciers Pictures
About Punakha and Wangdue Phodrang
River rafting Pho Chhu Valley (Photos)

Punakha: Traditional Bridges - Bazams
East-West Highway
Photo Galleries and Videos
East-West Highway: From Thimphu to Mongar
Punakha and Wangdue Phodrang Videos Punakha Dzong

top

Links
External links
GRID-Arendal News NASA's Global Change Master Directory United Nations Environment Programme World Glacier Monitoring Service International Centre for Integrated Mountain Development
top
previous page
Bhutan HOME