{"id":20069927,"date":"2021-04-06T12:30:00","date_gmt":"2021-04-06T07:00:00","guid":{"rendered":"https:\/\/www.thethirdpole.net\/?p=69927"},"modified":"2021-04-12T23:41:52","modified_gmt":"2021-04-12T18:11:52","slug":"glofs-himalayas","status":"publish","type":"post","link":"https:\/\/dialogue.earth\/en\/climate\/glofs-himalayas\/","title":{"rendered":"From Ladakh to Everest, risk of floods from glacial lakes grows"},"content":{"rendered":"\n<p>Glacial lakes in the Himalayas are becoming increasingly unstable and at risk of flooding, a trend evident in regions as far apart and different as the Everest area and Ladakh\u2019s arid upland deserts, two recent studies have found.<\/p>\n\n\n\n<div class=\"wp-block-cd-accordion block--accordion\"><span class=\"block--accordion__title\">What are Glacial lake outburst floods (GLOFs)?<\/span><div class=\"block--accordion__content\"><div class=\"block--accordion__content__inner\"><p>Glacial lake outburst floods (GLOFs) happen when glacial meltwater breaches the natural dams that a lake sits behind.<\/p><\/div><\/div><\/div>\n\n\n\n<p><a href=\"https:\/\/www.pnas.org\/content\/117\/2\/907\">According to researchers<\/a> at the University of Potsdam, \u201cSustained glacier melt in the Himalayas has gradually spawned more than 5,000 glacier lakes that are dammed by potentially unstable moraines.\u201d\u00a0<\/p>\n\n\n\n<p>GLOFs are extremely unpredictable, as they can be triggered by sudden pulses of meltwater. They can also be highly destructive as they surge downhill carrying rubble that destroys lives, homes and the fragile landscapes that locals and wildlife depend upon.<\/p>\n\n\n\n<p>Furthermore, climate change is increasing the number of supra-glacial lakes, small bodies of water that sit on top of glaciers, hemmed in by rock debris, and which tend to exacerbate the overall instability of the ice.<\/p>\n\n\n\n<div class=\"wp-block-cd-article-image aligncenter block--article-image\" itemscope itemtype=\"http:\/\/schema.org\/ImageObject\"><div class=\"block--article-image__column\"><div class=\"block--article-image__image\"><img class=\"lazy\" data-src=\"https:\/\/dialogue.earth\/content\/uploads\/2021\/04\/F1.large_.jpg\" data-srcset=\"https:\/\/dialogue.earth\/content\/uploads\/2021\/04\/F1.large_-768x447.jpg 768w, https:\/\/dialogue.earth\/content\/uploads\/2021\/04\/F1.large_-1024x596.jpg 1024w, https:\/\/dialogue.earth\/content\/uploads\/2021\/04\/F1.large_.jpg 1280w\" data-sizes=\"(max-width: 600px) 768px, (max-width: 1024px) 1024px, 1280px\" alt=\"Glacier lakes, Himalayas, PNAS\"\/><\/div><div class=\"block--article-image__content\"><div itemprop=\"caption\" class=\"block--article-image__caption\">Moraine-dammed lakes in the Himalayas. Bubbles are scaled to the total lake area, and colour-coded to abundance. Reported GLOFs (yellow triangles) have occurred most frequently in the past eight decades in Himalayan regions where glacier lakes are largest (Image: &#8216;Hazard from Himalayan glacier lake outburst floods&#8217;, PNAS, www.pnas.org\/content\/117\/2\/907_)<\/div><\/div><\/div><meta itemprop=\"contentUrl\" content=\"https:\/\/dialogue.earth\/content\/uploads\/2021\/04\/F1.large_.jpg\"\/><meta itemprop=\"contentSize\" content=\"253 KB\"\/><meta itemprop=\"height\" content=\"745\"\/><meta itemprop=\"width\" content=\"1280\"\/><meta itemprop=\"author\"\/><meta itemprop=\"representativeOfPage\" content=\"true\"\/><\/div>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-anatomy-of-a-glof-in-ladakh\">Anatomy of a GLOF in Ladakh<\/h2>\n\n\n\n<p>The <a href=\"https:\/\/www.sciencedirect.com\/science\/article\/abs\/pii\/S0048969720375392?via%3Dihub\">first of the two new studies<\/a> assessed changes over time to the Gya glacier in Ladakh, in northwest India. In 2014, this was the site of a GLOF when the glacier\u2019s lake burst, hitting Gya village, carrying away a bridge and destroying houses and farmland 14 kilometres downstream. Fortunately there were no fatalities, although other GLOFs <a href=\"https:\/\/dialogue.earth\/en\/climate\/surveying-bhutans-most-dangerous-glacial-lakes\/?utm_source=rss&amp;utm_medium=rss\">have taken lives<\/a>.<\/p>\n\n\n\n<p>Researchers from the University of Kashmir, Srinagar, analysed satellite data from 1969 to 2019. Using this, and interviews with villagers, they reconstructed the August 6, 2014 flood with computer modelling.<\/p>\n\n\n\n<div class=\"wp-block-cd-pullout-stat alignright undefined block--pullout-stat\"><p class=\"block--pullout-stat__title\">5,000<\/p><div class=\"block--pullout-stat__content\"><p>Glacial lakes that are dammed by potentially unstable moraines in the Himalayas<\/p><\/div><\/div>\n\n\n\n<p>They found that the total glacier area shrank by 45.6% in the 50 years to 2019, while the Gya lake nearly quadrupled in size from 3 hectares to roughly 11 hectares in the same period.<\/p>\n\n\n\n<p>Roughly 25% of the Gya glacial lake\u2019s waters poured out in the 2014 flood, inundating about 4 square kilometres around the village. However, \u201ca future worst-case GLOF could be 5.5 times larger than the 2014 event,\u201d said Irfan Rashid, senior assistant professor at the University of Kashmir\u2019s department of geoinformatics, and one of the authors of the study.<\/p>\n\n\n\n<p>The team\u2019s modelling shows that in the worst outburst scenario, up to 60% of the current lake water could be released, reaching Gya village in less than 20 minutes. \u201cThis study could be useful not only in planning disaster-resilient infrastructure around proglacial lake environments in the cold-arid Ladakh but also in framing mitigation plans to reduce risk for vulnerable downstream communities,\u201d Rashid said.<\/p>\n\n\n\n<p>The team\u2019s findings add weight to an earlier <a href=\"https:\/\/essd.copernicus.org\/articles\/12\/1245\/2020\/\">study of the western Himalayas<\/a> by the Wadia Institute of Himalayan Geology at Dehradun, which used satellite photos of the 252 glaciers in the Suru sub-basin in Jammu and Kashmir from 1971 to 2017. It found glaciers in the area had been degenerating over the 46 years studied. However, the process accelerated after 2000, leading to glacier shrinkage, plus more exposed rock debris \u2013&nbsp;which can increase the destructiveness of GLOFs.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-eastern-himalayas-a-glof-hazard-hotspot\">Eastern Himalayas a GLOF hazard hotspot<\/h2>\n\n\n\n<p>However, the risk of GLOFs from degenerating glaciers is greatest in the eastern Himalayas: the risk is three times higher than in any other Himalayan region, according to the <a href=\"https:\/\/www.pnas.org\/content\/117\/2\/907\">researchers from the University of Potsdam<\/a>.<\/p>\n\n\n\n<p>A second recent <a href=\"https:\/\/www.sciencedirect.com\/science\/article\/abs\/pii\/S0048969720351159\">study on glacial lakes<\/a> revealed a dramatic increase in supra-glacial lakes, ponds of water that sit on the surface of glaciers. Scientists at the Indian Institute of Technology (IIT), Kharagpur looked at supra-glacial lakes distributed among 17 glaciers within the Everest Himalaya. Supra-glacial lakes are common on debris-covered glaciers. They are mostly small \u2013 0.005 sq km in size, but no less hazardous.&nbsp;As well as accelerating the melting of glaciers\u2019 surfaces, the water from supra-glacial lakes can can seep through the glacier ice, lubricating the glacier-bed and sometimes resulting in glacier surges (sudden advances of glacier ice).<\/p>\n\n\n\n<div class=\"wp-block-cd-pullout-stat alignleft undefined block--pullout-stat\"><p class=\"block--pullout-stat__title\">Fewer than 7%<\/p><div class=\"block--pullout-stat__content\"><p>Of glacial lakes studied in the Everest Himalayas were found to be constant<\/p><\/div><\/div>\n\n\n\n<p>They also used satellite imagery to measure the number of supra-glacial lakes in the Everest Himalaya between 2010 and 2019, and found the overall water surface expanded by roughly 0.08 sq km a year.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-why-are-glofs-increasing-in-the-himalayas\">Why are GLOFs increasing in the Himalayas?<\/h2>\n\n\n\n<p>The increases are due to global warming, glacial ice melting and changes in snowfall patterns, said Sabyasachi Maiti, assistant professor of geology at IIT in Kharagpur.<\/p>\n\n\n\n<p>\u201cThe monitoring of such lakes is challenging, as they are dynamic [or shifting],\u201d he told <a href=\"https:\/\/dialogue.earth\/en\/\">The Third Pole<\/a>. Out of 2,424 lakes studied, only 161 were found to be constant. These lakes are continuously increasing in size and may join to form bigger lakes, the IIT team found. They observed clusters of lakes forming at higher levels, due to increasing temperatures, and decreasing glacier slope and ice thickness.<\/p>\n\n\n\n<a class=\"wp-block-cd-related-news alignright block--related-news loading\" data-post-id=\"20036676\"><div class=\"block--related-news__image\"><\/div><div class=\"block--related-news__content\"><span class=\"block--related-news__heading\">Recommended<\/span><span class=\"block--related-news__title\"><\/span><\/div><\/a>\n\n\n\n<p>The more consistent lakes are concentrated mostly in the lower part of the lower areas or \u201cablation zones\u201d, where there is a net loss of ice (that is, more ice is being lost due to melting than is being added).<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-everest-more-perilous\">Everest more perilous<\/h2>\n\n\n\n<p>In practical terms, travellers and mountain tours to Everest may have difficulties locating their fixed base camps because of the lakes, Maiti said. The implications of this are significant, given Everest expeditions generate <a href=\"https:\/\/www.bloomberg.com\/graphics\/2020-everest-reopening-sherpa-supply-chain\/\">more than USD 300 million a year<\/a> for Nepal.<\/p>\n\n\n\n<p>\u201cIn the short term, this study can be a guide to the Nepali government for deciding the most stable and safe location for Everest base camp, considering the immense demands of sports activities. Most of the large glaciers of the Himalaya are debris-dominated and supra-glacial lake formation is prevalent,\u201d he said.<\/p>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-9d6595d7 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<a class=\"wp-block-cd-related-news alignright block--related-news loading\" data-post-id=\"20017505\"><div class=\"block--related-news__image\"><\/div><div class=\"block--related-news__content\"><span class=\"block--related-news__heading\">Recommended<\/span><span class=\"block--related-news__title\"><\/span><\/div><\/a>\n<\/div>\n\n\n\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\">\n<a class=\"wp-block-cd-related-news block--related-news loading\" data-post-id=\"20034607\"><div class=\"block--related-news__image\"><\/div><div class=\"block--related-news__content\"><span class=\"block--related-news__heading\">Recommended<\/span><span class=\"block--related-news__title\"><\/span><\/div><\/a>\n<\/div>\n<\/div>\n\n\n\n<p>The IIT study also found that immediately after the 2015 Nepal earthquake, the number of supra-glacial lakes increased. \u201cIndirectly, this indicates that the combination of global warming and earthquakes may cause a future severe hazard in foothills areas. More studies would be required for future policy implementation,\u201d he said.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"h-need-for-more-monitoring\">Need for more monitoring<\/h2>\n\n\n\n<p>Rashid said that out of more than 50,000 glaciers in the Himalayan ranges, only 24 glaciers have their mass balance monitored in-situ.<\/p>\n\n\n\n<p>For the northwest Himalayan region, there are no long-term mass balance records, he said.<\/p>\n\n\n\n<div class=\"wp-block-cd-accordion block--accordion\"><span class=\"block--accordion__title\">What is mass balance?<\/span><div class=\"block--accordion__content\"><div class=\"block--accordion__content__inner\"><p>The difference between the snow a glacier accumulates over the winter and the snow and ice that melts over the summer.<\/p><\/div><\/div><\/div>\n\n\n\n<p>And although several scientific studies&nbsp;have previously reported the expansion of glacial lakes and the formation of new ones, only two Himalayan glacial lakes have any kind of continuous monitoring mechanism: South Lhonak in Sikkim in India and Imja in Nepal. Rashid added that GLOFs in the Indian Himalayas have been studied less than those elsewhere in the Himalayan arc.<\/p>\n\n\n\n<p>Other scientists are also calling for more monitoring networks. A March 2020 report on the <a href=\"https:\/\/www.nature.com\/articles\/s41598-020-61277-8\">hazardous surge of the Shispare glacier in the Karakorum range<\/a> between 2017 and 2019 (it formed an ice-dammed lake and created a small GLOF), recommends regular monitoring for potential GLOF warnings. \u201cThe absence of in-situ observations leads to poor understanding of the processes that translate into a disaster like GLOFs and their downstream impacts,\u201d leading to a greater degree of uncertainty,&nbsp;said Rashid.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Scientists say shrinking glaciers and bigger meltwater lakes are growing dangers for people and landscapes across the Himalayan region, with more monitoring needed to avert future tragedies<\/p>\n","protected":false},"author":20000286,"featured_media":20069929,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[761],"tags":[20000192,50040713,50040707],"hashtags":[],"country":[20000111,20000113],"class_list":["post-20069927","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-climate","tag-disasters","tag-glaciers","tag-the-third-pole","country-india","country-nepal"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v26.0 (Yoast SEO v26.0) - 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