{"id":17135,"date":"2015-12-14T17:10:26","date_gmt":"2015-12-14T17:10:26","guid":{"rendered":"http:\/\/blogs.agu.org\/landslideblog\/?p=17135"},"modified":"2015-12-14T17:10:26","modified_gmt":"2015-12-14T17:10:26","slug":"fort-mcpherson-a-catastrophic-mudflow-in-canada","status":"publish","type":"post","link":"https:\/\/blogs.agu.org\/landslideblog\/2015\/12\/14\/fort-mcpherson-a-catastrophic-mudflow-in-canada\/","title":{"rendered":"Fort McPherson: a catastrophic mudflow in Canada"},"content":{"rendered":"<h5>Fort McPherson mudslide in Canada<\/h5>\n<p>In Canada near to Fort McPherson in the Northwest Territories (NWT), a mudslide has been slowly eroding the barrier that retained a small but far from insignificant lake.\u00a0 This situation has been developing for a number of months, and back in June the NWT Geological Survey released a warning that the lake would fail catastrophically by the end of the year.\u00a0 This image, taken by <a href=\"http:\/\/scottzolkos.weebly.com\/blog\">Scott Zolkos of the University of Alberta<\/a>, illustrates rather clearly why this was a site that was causing much concern:-<\/p>\n<div id=\"attachment_17137\" style=\"width: 630px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/blogs.agu.org\/landslideblog\/files\/2015\/12\/15_12-McPherson-1.jpg\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-17137\" class=\"size-full wp-image-17137\" src=\"https:\/\/blogs.agu.org\/landslideblog\/files\/2015\/12\/15_12-McPherson-1.jpg\" alt=\"Fort McPherson mudslide\" width=\"620\" height=\"360\" srcset=\"https:\/\/blogs.agu.org\/landslideblog\/files\/2015\/12\/15_12-McPherson-1.jpg 620w, https:\/\/blogs.agu.org\/landslideblog\/files\/2015\/12\/15_12-McPherson-1-300x174.jpg 300w\" sizes=\"auto, (max-width: 620px) 100vw, 620px\" \/><\/a><p id=\"caption-attachment-17137\" class=\"wp-caption-text\">Fort McPherson mudslide, picture by Scott Zolkos, University of Alberta<\/p><\/div>\n<p>.<\/p>\n<p>Last week it was announced that the landslide retrogressed to the point that the barrier partially breached on 15th July .\u00a0 The event was reported in some detail in an <a href=\"https:\/\/news.vice.com\/article\/that-lake-that-was-going-to-fall-off-a-cliff-in-canada-actually-did?utm_source=vicenewstwitter\">article this week in Vice News<\/a>, which notes that:<\/p>\n<blockquote><p>On July 15, between 8 and 9 pm, the slumping permafrost that held back the unnamed lake finally gave way. The ensuing cascade gushed roughly 30,000 cubic meters of water in a flow that could have filled a dozen Olympic swimming pools. Although remote camera&#8217;s captured the event, the extreme isolation of Fort McPherson, which sits roughly 1,800 miles due north of Vancouver, meant that news of the flood would not reach those studying the lake until weeks later.<\/p><\/blockquote>\n<p>Interestingly, the movement of the mudslide was captured in time-lapse footage by a web cam at the site.\u00a0 <a href=\"https:\/\/www.youtube.com\/watch?v=5FjrRDDnLIw\">That footage is now on Youtube<\/a>:<\/p>\n<p><iframe loading=\"lazy\" src=\"https:\/\/www.youtube.com\/embed\/5FjrRDDnLIw?rel=0\" width=\"640\" height=\"360\" frameborder=\"0\" allowfullscreen=\"allowfullscreen\"><\/iframe><\/p>\n<p>.<\/p>\n<p>The mudflow is very interesting, not least the way that the mass accelerates as the water permeates through the debris.\u00a0 The partial breach has of course greatly reduced the hazard.\u00a0 However, the main point here is not this comparatively small if dramatic breach event near to Fort McPherson, but the way that warming temperatures is driving increasing amounts of thawing in these glacial deposits, triggering rising numbers of permafrost landslides like this one.\u00a0 As the <a href=\"https:\/\/news.vice.com\/article\/that-lake-that-was-going-to-fall-off-a-cliff-in-canada-actually-did?utm_source=vicenewstwitter\">Vice News article<\/a> wisely observes:<\/p>\n<blockquote><p>Many other slumps throughout the region continue to alter the landscape and are clouding and clogging waterways with loads of sediment that scientists have found to have strong negative effects on aquatic ecology. According to Pisaric, these changes have provoked deep anxiety among the Gwich&#8217;ins of Fort McPherson, worries he said are shared among many communities across Canada&#8217;s north.<\/p><\/blockquote>\n<p>Scott Zolkos has some <a href=\"http:\/\/scottzolkos.weebly.com\/blog\">amazing images of these landslides on his blog<\/a>.<\/p>\n<!-- AddThis Advanced Settings generic via filter on the_content --><!-- AddThis Share Buttons generic via filter on the_content -->","protected":false},"excerpt":{"rendered":"<p>In the summer a permafrost mudslide caused the partial breach, caught on video, of a small lake near Fort McPherson in Canada.   <!-- AddThis Advanced Settings generic via filter on wp_trim_excerpt --><!-- AddThis Share Buttons generic via filter on wp_trim_excerpt --><\/p>\n","protected":false},"author":22,"featured_media":17137,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[79,4,469,959,725,218],"class_list":["post-17135","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-uncategorized","tag-breach","tag-canada","tag-featured","tag-landslide-report","tag-north-america","tag-permafrost"],"_links":{"self":[{"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/posts\/17135","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/users\/22"}],"replies":[{"embeddable":true,"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/comments?post=17135"}],"version-history":[{"count":0,"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/posts\/17135\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/media\/17137"}],"wp:attachment":[{"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/media?parent=17135"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/categories?post=17135"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/tags?post=17135"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}