{"id":40400,"date":"2022-03-15T07:34:42","date_gmt":"2022-03-15T07:34:42","guid":{"rendered":"https:\/\/blogs.agu.org\/landslideblog\/?p=40400"},"modified":"2022-03-15T07:34:42","modified_gmt":"2022-03-15T07:34:42","slug":"lyneham-2","status":"publish","type":"post","link":"https:\/\/blogs.agu.org\/landslideblog\/2022\/03\/15\/lyneham-2\/","title":{"rendered":"A drone video of the B4069 Lyneham landslide"},"content":{"rendered":"<h4>A drone video of the B4069 Lyneham landslide<\/h4>\n<p>On 25 February <a href=\"https:\/\/blogs.agu.org\/landslideblog\/2022\/02\/25\/lyneham-1\/\">I blogged about the Lyneham landslide<\/a>, a substantial failure on the B4069 road at Dauntsey Banks in Wiltshire, in southern England.\u00a0 With thanks to <a href=\"https:\/\/blogs.agu.org\/landslideblog\/2022\/02\/25\/lyneham-1\/#comment-239958\">Stuart Lewis, who highlighted in a comment to that original post<\/a>\u00a0that <a href=\"https:\/\/www.youtube.com\/watch?v=jh1OAb_i39Q\">a video has now been posted to Youtube that provides drone footage of the landslide<\/a>:-<\/p>\n<iframe loading=\"lazy\" title=\"Destroyed Road B4069, Dauntsey Banks, Wiltshire\" width=\"800\" height=\"450\" src=\"https:\/\/www.youtube.com\/embed\/jh1OAb_i39Q?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture\" allowfullscreen><\/iframe>\n<p>.<\/p>\n<p>The video, which was collected on 8 March 2022, provides both aerial views and static shots of this most interesting landslide.\u00a0 In my original post I noted that there appears to have been construction activity in the field directly upslope of the road.\u00a0 The video provides clarification on this.\u00a0 The image below is a still from the video &#8211; it is most interesting:-<\/p>\n<div id=\"attachment_40405\" style=\"width: 810px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-40405\" class=\" wp-image-40405\" src=\"https:\/\/blogs.agu.org\/landslideblog\/files\/2022\/03\/22_03-Lyneham-1.jpg\" alt=\"The Lyneham landslide, showing construction activity in the field upslope of the road. \" width=\"800\" height=\"415\" srcset=\"https:\/\/blogs.agu.org\/landslideblog\/files\/2022\/03\/22_03-Lyneham-1.jpg 1176w, https:\/\/blogs.agu.org\/landslideblog\/files\/2022\/03\/22_03-Lyneham-1-300x156.jpg 300w, https:\/\/blogs.agu.org\/landslideblog\/files\/2022\/03\/22_03-Lyneham-1-1024x531.jpg 1024w, https:\/\/blogs.agu.org\/landslideblog\/files\/2022\/03\/22_03-Lyneham-1-768x398.jpg 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><p id=\"caption-attachment-40405\" class=\"wp-caption-text\">The Lyneham landslide, showing construction activity in the field upslope of the road. <a href=\"https:\/\/www.youtube.com\/watch?v=jh1OAb_i39Q\">Still from a video posted to Youtube<\/a>.<\/p><\/div>\n<p>.<\/p>\n<p>Here is another view of the site:-<\/p>\n<div id=\"attachment_40407\" style=\"width: 810px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-40407\" class=\" wp-image-40407\" src=\"https:\/\/blogs.agu.org\/landslideblog\/files\/2022\/03\/22_03-Lyneham-2.jpg\" alt=\"The Lyneham landslide, showing construction activity in the field upslope of the road. Still from a video posted to Youtube.\" width=\"800\" height=\"415\" srcset=\"https:\/\/blogs.agu.org\/landslideblog\/files\/2022\/03\/22_03-Lyneham-2.jpg 1166w, https:\/\/blogs.agu.org\/landslideblog\/files\/2022\/03\/22_03-Lyneham-2-300x156.jpg 300w, https:\/\/blogs.agu.org\/landslideblog\/files\/2022\/03\/22_03-Lyneham-2-1024x531.jpg 1024w, https:\/\/blogs.agu.org\/landslideblog\/files\/2022\/03\/22_03-Lyneham-2-768x398.jpg 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><p id=\"caption-attachment-40407\" class=\"wp-caption-text\">The Lyneham landslide, showing construction activity in the field upslope of the road. <a href=\"https:\/\/www.youtube.com\/watch?v=jh1OAb_i39Q\">Still from a video posted to Youtube<\/a>.<\/p><\/div>\n<p>.<\/p>\n<p>I think there are a few things to note here.\u00a0 First, the landslide has extended most of the way through this field, with the largest rear scarp area being located adjacent to the pad on which the new buildings are being constructed.\u00a0 Second, the failed section of road corresponds very closely to the eastern boundaries of the field in which construction was being undertaken.\u00a0 This is particularly evident in the first of the two images above.\u00a0 Third, it appears that although building construction has occurred in only a part of this field, it appears that the surface cover throughout has been changed.\u00a0 This is the field in 2019, from Google Earth:-<\/p>\n<div id=\"attachment_40409\" style=\"width: 810px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-40409\" class=\" wp-image-40409\" src=\"https:\/\/blogs.agu.org\/landslideblog\/files\/2022\/03\/22_03-Lyneham-3.jpg\" alt=\"Google Earth image of the site of the Lyneham landslide in Wiltshire.\" width=\"800\" height=\"512\" srcset=\"https:\/\/blogs.agu.org\/landslideblog\/files\/2022\/03\/22_03-Lyneham-3.jpg 1404w, https:\/\/blogs.agu.org\/landslideblog\/files\/2022\/03\/22_03-Lyneham-3-300x192.jpg 300w, https:\/\/blogs.agu.org\/landslideblog\/files\/2022\/03\/22_03-Lyneham-3-1024x656.jpg 1024w, https:\/\/blogs.agu.org\/landslideblog\/files\/2022\/03\/22_03-Lyneham-3-768x492.jpg 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><p id=\"caption-attachment-40409\" class=\"wp-caption-text\">Google Earth image of the site of the Lyneham landslide in Wiltshire.<\/p><\/div>\n<p>.<\/p>\n<p>I am speculating here, but has the field been regraded (note the scarps downslope of the tracks in the second image)?<\/p>\n<p>Of course, I cannot provide a link between the activities in this field and the reactivation of the landslide &#8211; that could only be established through a proper site investigation.\u00a0 I am sure that this is being undertaken.\u00a0 There are other possible causes.\u00a0 But it is certainly a line of enquiry that is worthy of deeper examination.<\/p>\n<p><a href=\"https:\/\/blogs.agu.org\/landslideblog\/2022\/02\/25\/lyneham-1\/\">As I noted in my first post<\/a>, this is an area that shows clear signs of previous landslide activity, and the failure appears to me to be a reactivation.\u00a0 This highlights why it is important to get input from an engineering geomorphologist before undertaking works such as this in these areas.<\/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>A drone video has been posted to Youtube showing the Lyneham landslide in S. England. It shows that construction work was underway in the field upslope of the section of road that failed. <!-- 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":40407,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":"","_members_access_role":[],"_members_access_error":""},"categories":[29],"tags":[2349,182,144,469,959,963,636,1162],"class_list":["post-40400","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-landslide-video","tag-drone","tag-england","tag-europe","tag-featured","tag-landslide-report","tag-landslide-video","tag-reactivation","tag-united-kingdom"],"_links":{"self":[{"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/posts\/40400","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=40400"}],"version-history":[{"count":0,"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/posts\/40400\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/media\/40407"}],"wp:attachment":[{"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/media?parent=40400"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/categories?post=40400"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/tags?post=40400"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}