{"id":37483,"date":"2021-04-23T14:17:35","date_gmt":"2021-04-23T14:17:35","guid":{"rendered":"https:\/\/blogs.agu.org\/landslideblog\/?p=37483"},"modified":"2021-04-23T14:17:35","modified_gmt":"2021-04-23T14:17:35","slug":"phong-dien-1","status":"publish","type":"post","link":"https:\/\/blogs.agu.org\/landslideblog\/2021\/04\/23\/phong-dien-1\/","title":{"rendered":"The 13 October 2020 landslide in Phong Dien, Vietnam, triggered by an extraordinary rainfall event"},"content":{"rendered":"

The 13 October 2020 landslide in Phong Dien, Vietnam, triggered by an extraordinary rainfall event<\/h4>\n

On 13 October 2020 heavy rainfall triggered a rapid landslide at Phong Dien in Thua Thien Hue, Vietnam.\u00a0 I covered this event at the time – it was a double tragedy as the landslide killed 13 members of a rescue team en route to another landslide accident<\/a>.\u00a0 A paper (Van Tien et al.<\/em> 2021<\/a>) has just been published in the journal Landslides<\/em><\/a> that provides a description of this event.<\/p>\n

The events started with a landslide at the construction site of the Rao Trang-3 hydropower plant<\/a> on 12 October 2020.\u00a0 This landslide killed 17 people.\u00a0 A rescue team was dispatched to assist in the rescue and recovery operation.\u00a0 The team stopped for the night at a location that is described as Ranger Station-7, situated in Phong Dien, c.10 km from the Rao Trang-3 site.<\/p>\n

Van Tien et al.<\/em> (2021)<\/a> describe an extraordinary amount of rainfall.\u00a0 At the nearby A Luoi rainfall station, a total of 2190.2 mm was recorded in the period 6-12 October 2020.\u00a0 The landslide at Ranger Station-7 occurred at midnight on 13 October.\u00a0 The landslide is located at 16.434\u00b0, 107.311\u00b0. The Google Earth image below, collected in February 2021, shows the aftermath of the landslide:-<\/p>\n

\"Google

Google Earth image of the 13 October 2020, deadly landslide in Phong Dien, Vietnam.<\/p><\/div>\n

.<\/p>\n

Perhaps surprisingly, Van Tien et al.<\/em> (2021)<\/a> describe the initial failure, at the top of the slope, as being rotational:<\/p>\n

The landslide was characterized as a rotational type with a visible sliding surface, head scarp, and flanks in the upper slope area. The landslide took place on an average slope of 21\u00b0 with a poor vegetation cover. The lower slope is quite gentle, with an angle of 18\u00b0, while the slope angle of the upper part is 27\u00b0. <\/em><\/p>\n

The landslide length was 546 m, with a volume of 81,500 m3<\/sup>.<\/p>\n

The authors suggest that failure occurred initially in a block downslope of the final crown of the landslide – a section that they call Block I:-<\/p>\n

\"The

The failure process of the 13 October 2020, deadly landslide in Phong Dien, Vietnam. Diagram from Van Tien et al.<\/em> (2021)<\/a>.<\/p><\/div>\n

 <\/p>\n

.<\/p>\n

About 5 minutes later Block II failed due to the loss of toe support.\u00a0 Van Tien et al.<\/em> (2021)<\/a> suggest that the landslide was highly mobile, moving at 29 m\/sec.\u00a0 Only eight of the 21 people in the Ranger Station survived, all with injuries.<\/p>\n

This extraordinary rainfall event triggered many other landslides in the Phong Dien area, as the image below shows.\u00a0 Some appear to have had quite high mobility:-<\/p>\n

\"Google

Google Earth image of landslides triggered by the October 2020 rain event in Phong Dien, Vietnam.<\/p><\/div>\n

.<\/p>\n

Reference<\/h4>\n

Van Tien, P., Trinh, P.T., Luong, L.H.\u00a0et al. <\/i>2021.\u00a0The October 13, 2020, deadly rapid landslide triggered by heavy rainfall in Phong Dien, Thua Thien Hue, Vietnam<\/a>.\u00a0Landslides<\/i>. https:\/\/doi.org\/10.1007\/s10346-021-01663-z<\/p>\n","protected":false},"excerpt":{"rendered":"

The 13 October 2020, deadly landslide in Phong Dien, Vietnam, which was triggered by an extraordinary rainfall event <\/p>\n","protected":false},"author":22,"featured_media":37486,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[544],"tags":[469,959,30632,314,272],"class_list":["post-37483","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-review-of-a-paper","tag-featured","tag-landslide-report","tag-recview-of-a-paper","tag-se-asia","tag-vietnam"],"_links":{"self":[{"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/posts\/37483","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=37483"}],"version-history":[{"count":0,"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/posts\/37483\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/media\/37486"}],"wp:attachment":[{"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/media?parent=37483"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/categories?post=37483"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/tags?post=37483"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}