{"id":41960,"date":"2022-10-27T06:16:07","date_gmt":"2022-10-27T06:16:07","guid":{"rendered":"https:\/\/blogs.agu.org\/landslideblog\/?p=41960"},"modified":"2022-10-27T06:16:07","modified_gmt":"2022-10-27T06:16:07","slug":"yucaipa-1","status":"publish","type":"post","link":"https:\/\/blogs.agu.org\/landslideblog\/2022\/10\/27\/yucaipa-1\/","title":{"rendered":"Yucaipa: a remarkable debris flow video from the San Bernardino Mountains"},"content":{"rendered":"<h4>Yucaipa: a remarkable debris flow video from the San Bernardino Mountains<\/h4>\n<p>On Tuesday <a href=\"https:\/\/twitter.com\/smb\/status\/1585146376002113538\">a remarkable video was posted to Twitter showing a series of debris flows at Yucaipa in the San Bernadino Mountains of California<\/a>:-<\/p>\n<blockquote class=\"twitter-tweet\" data-width=\"500\" data-dnt=\"true\">\n<p lang=\"en\" dir=\"ltr\">This amazing video captured by San Bernardino county public works &#8211; watch all the processes of a <a href=\"https:\/\/twitter.com\/hashtag\/debrisflow?src=hash&amp;ref_src=twsrc%5Etfw\">#debrisflow<\/a> of the El Dorado scar September 12, 2022 &#8211; heavy rain rates on scar at 8000 feet in 1 hour <a href=\"https:\/\/t.co\/ZApuQZ5FuP\">pic.twitter.com\/ZApuQZ5FuP<\/a><\/p>\n<p>&mdash; Alex Tardy Skiwxman (@SanDiegoWCMwx) <a href=\"https:\/\/twitter.com\/SanDiegoWCMwx\/status\/1584932858950320129?ref_src=twsrc%5Etfw\">October 25, 2022<\/a><\/p><\/blockquote>\n<p><script async src=\"https:\/\/platform.twitter.com\/widgets.js\" charset=\"utf-8\"><\/script><\/p>\n<p>.<\/p>\n<p><a href=\"https:\/\/www.youtube.com\/watch?v=I3ezwryfSSk\">The video is also on Youtube<\/a>.\u00a0 This series of debris flows, which occurred over the period of a single hour, were generated from the scar of the<a href=\"https:\/\/en.wikipedia.org\/wiki\/El_Dorado_Fire\"> 2020 El Dorado fire<\/a> by intense precipitation.\u00a0 The events occurred on 12 September 2022 when the remnants of Tropical Storm Kay triggered heavy rainfall &#8211; up to 60 mm was recorded.\u00a0 The debris flows affected two communities, Forest Falls and Yucaiba.\u00a0 <a href=\"https:\/\/www.latimes.com\/california\/story\/2022-09-26\/forest-falls-oak-glen-mudslide#:~:text=Car%2Dsize%20boulders%20came%20crashing,and%20mud%20overtook%20her%20home\">The Los Angeles Times has reported that a women was killed in Forest Falls<\/a>.\u00a0 The same article has some dramatic images of the aftermath:-<\/p>\n<div id=\"attachment_41963\" style=\"width: 809px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-41963\" class=\"wp-image-41963\" src=\"https:\/\/blogs.agu.org\/landslideblog\/files\/2022\/10\/22_10-Yucaiba-1.jpg\" alt=\"The aftermath of the 12 September 2022 debris flows in Yucaipa and Forest Falls, California. \" width=\"799\" height=\"540\" srcset=\"https:\/\/blogs.agu.org\/landslideblog\/files\/2022\/10\/22_10-Yucaiba-1.jpg 1048w, https:\/\/blogs.agu.org\/landslideblog\/files\/2022\/10\/22_10-Yucaiba-1-300x203.jpg 300w, https:\/\/blogs.agu.org\/landslideblog\/files\/2022\/10\/22_10-Yucaiba-1-1024x693.jpg 1024w, https:\/\/blogs.agu.org\/landslideblog\/files\/2022\/10\/22_10-Yucaiba-1-768x520.jpg 768w\" sizes=\"auto, (max-width: 799px) 100vw, 799px\" \/><p id=\"caption-attachment-41963\" class=\"wp-caption-text\"><em>The aftermath of the 12 September 2022 debris flows in Yucaipa and Forest Falls, California. <a href=\"https:\/\/www.latimes.com\/california\/story\/2022-09-26\/forest-falls-oak-glen-mudslide#:~:text=Car%2Dsize%20boulders%20came%20crashing,and%20mud%20overtook%20her%20home\">Image by Gina Ferazzi \/ Los Angeles Times<\/a>.<\/em><\/p><\/div>\n<p>.<\/p>\n<p>The video shows the complex behaviour of debris flows, with multiple pulses or surges of debris travelling down the channel, which is typical for such events.\u00a0 In the early part of the video, the surges have quite a high density, but note that it appears that there was no rainfall at the site of the camera at the time:-<\/p>\n<p>&nbsp;<\/p>\n<div id=\"attachment_41965\" style=\"width: 809px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-41965\" class=\" wp-image-41965\" src=\"https:\/\/blogs.agu.org\/landslideblog\/files\/2022\/10\/22_10-Yucaiba-2.jpg\" alt=\"One of the debris flow pulses in Yucaipa, California.  \" width=\"799\" height=\"441\" srcset=\"https:\/\/blogs.agu.org\/landslideblog\/files\/2022\/10\/22_10-Yucaiba-2.jpg 1216w, https:\/\/blogs.agu.org\/landslideblog\/files\/2022\/10\/22_10-Yucaiba-2-300x166.jpg 300w, https:\/\/blogs.agu.org\/landslideblog\/files\/2022\/10\/22_10-Yucaiba-2-1024x565.jpg 1024w, https:\/\/blogs.agu.org\/landslideblog\/files\/2022\/10\/22_10-Yucaiba-2-768x424.jpg 768w\" sizes=\"auto, (max-width: 799px) 100vw, 799px\" \/><p id=\"caption-attachment-41965\" class=\"wp-caption-text\"><em>One of the debris flow pulses in Yucaipa, California. <a href=\"https:\/\/www.youtube.com\/watch?v=I3ezwryfSSk\">Still from a video posted to Youtube<\/a>.<\/em><\/p><\/div>\n<p>.<\/p>\n<p>Later in the video there is heavy rainfall at the camera site.\u00a0 The debris flow had become less dense and was behaving more as a debris flood:-<\/p>\n<div id=\"attachment_41967\" style=\"width: 810px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-41967\" class=\" wp-image-41967\" src=\"https:\/\/blogs.agu.org\/landslideblog\/files\/2022\/10\/22_10-Yucaiba-3.jpg\" alt=\"A later stage of the debris flows at Yucaipa, California.  \" width=\"800\" height=\"435\" srcset=\"https:\/\/blogs.agu.org\/landslideblog\/files\/2022\/10\/22_10-Yucaiba-3.jpg 1219w, https:\/\/blogs.agu.org\/landslideblog\/files\/2022\/10\/22_10-Yucaiba-3-300x163.jpg 300w, https:\/\/blogs.agu.org\/landslideblog\/files\/2022\/10\/22_10-Yucaiba-3-1024x557.jpg 1024w, https:\/\/blogs.agu.org\/landslideblog\/files\/2022\/10\/22_10-Yucaiba-3-768x418.jpg 768w\" sizes=\"auto, (max-width: 800px) 100vw, 800px\" \/><p id=\"caption-attachment-41967\" class=\"wp-caption-text\"><em>A later stage of the debris flows at Yucaipa, California. <a href=\"https:\/\/www.youtube.com\/watch?v=I3ezwryfSSk\">Still from a video posted to Youtube<\/a>.<\/em><\/p><\/div>\n<p>.<\/p>\n<p>Note however that some evidence of pulses of debris is still seen.<\/p>\n<p><a href=\"https:\/\/www.latimes.com\/california\/story\/2022-09-26\/forest-falls-oak-glen-mudslide#:~:text=Car%2Dsize%20boulders%20came%20crashing,and%20mud%20overtook%20her%20home\">The Los Angeles Times article highlights the challenges faced by communities affected by such events<\/a>.\u00a0 This is a quote from Brenda Ebrahim, a resident of Yucaipa whose property has been badly affected by such events:<\/p>\n<p><em>\u201cWe\u2019ve been begging for help for years since they told us this was going to happen,\u201d Ebrahim said. \u201cI\u2019ve been through it, I know how it works. It\u2019s not sustainable. This is California\u2019s new reality.\u201d<\/em><\/p>\n<p>Of course we are now moving towards the winter period, when high intensity rainfall events often occur.<\/p>\n<p>.<\/p>\n<h4>Acknowledgement<\/h4>\n<p>Thanks to <a href=\"https:\/\/twitter.com\/smb\">Steve Beattie<\/a>, who spotted this and highlighted it to me via Twitter.<\/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>Yucaipa: a remarkable debris flow video from the San Bernardino Mountains in California.  The flows were triggered by heavy rainfall in the El Dorado fire scar on 12 September 2022<!-- 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":41965,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[29],"tags":[30715,57,469,963,641],"class_list":["post-41960","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-landslide-video","tag-california-usa","tag-debris-flow","tag-featured","tag-landslide-video","tag-mudflow"],"_links":{"self":[{"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/posts\/41960","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=41960"}],"version-history":[{"count":0,"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/posts\/41960\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/media\/41965"}],"wp:attachment":[{"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/media?parent=41960"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/categories?post=41960"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blogs.agu.org\/landslideblog\/wp-json\/wp\/v2\/tags?post=41960"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}