{"id":33433,"date":"2020-03-28T09:53:09","date_gmt":"2020-03-28T09:53:09","guid":{"rendered":"https:\/\/blogs.agu.org\/landslideblog\/?p=33433"},"modified":"2020-03-28T09:53:53","modified_gmt":"2020-03-28T09:53:53","slug":"the-28-june-2010-guanling-landslide-in-china","status":"publish","type":"post","link":"https:\/\/blogs.agu.org\/landslideblog\/2020\/03\/28\/the-28-june-2010-guanling-landslide-in-china\/","title":{"rendered":"The 28 June 2010 Guanling landslide in China"},"content":{"rendered":"

The 28 June 2010 Guanling landslide in China<\/h4>\n

On 28 June 2010 the Guanling landslide in Guizhou<\/a>, China<\/a> killed 99 people.\u00a0 Triggered by heavy rainfall, the landslide had a volume of almost a million cubic metres and a travel distance of about 1.4 km.\u00a0 The landslide is described in an article in the Canadian Geotechnical Journal<\/a> (Xing et al.<\/em> 2015<\/a>).\u00a0 Another paper, Yin et al.<\/em> (2011)<\/a> includes this aerial image of the landslide source and track:-<\/p>\n

\"The

Aerial image of the source and track of the Guanling landslide. Image from Yin et al.<\/em> (2011)<\/a>.<\/p><\/div>\n

.<\/p>\n

The landslide appears to have occurred early in the 2010 summer monsoon.\u00a0 Xing et al.<\/em> (2015)<\/a> include in their paper the following rainfall information for the days leading up to the landslide.\u00a0 On 28 May this area received 260 mm of rainfall:-<\/p>\n

\"Rainfall

Rainfall data for the 28 June 2010 Guanling landslide, from Xing et al.<\/em> (2015)<\/a>.<\/p><\/div>\n

.<\/p>\n

Note that in an average year, the area has received 309 mm of rainfall by 28 June, so this was an exceptional event. This was the highest rainfall total on record for this area at the time of the Guanling landslide.<\/p>\n

The landslide itself occurred at about 2 pm when a mass of Triassic sandstone collapsed.\u00a0 According to\u00a0 Xing et al.<\/em> (2015)<\/a>, the landslide travelled across the valley floor and partially super-elevated on the far side, before descending the slope to impact first Yongwo village, where 21 houses were destroyed. The landslide transitioned into a rock avalanche, travelling rapidly down the valley.\u00a0 Close to the valley floor, the topography had a sharp bend; the rock avalanche super-elevated once more, striking the village of Dazhai, where it destroyed 17 houses.\u00a0 Yin et al.<\/em> (2011)<\/a> estimate that it had a peak velocity of about 45 metres per second (about 160 km per hour).<\/p>\n

The runout distance and velocity of the landslide were unusually high.\u00a0 Yin et al.<\/em> (2011) suggest that deposits in the floor of the valley through which the Guanling landslide passed were saturated, providing a low friction surface that accounts for the exceptional mobility.<\/p>\n

Every year there are a small number of these large, highly destructive landslides in high mountain areas<\/a>.\u00a0 The Guanling landslide illustrates the difficulties of identifying potential locations and forecasting their behaviour.<\/p>\n

References<\/h4>\n

Xing, A., Wang, G., Li, B., Jiang, Y., Feng, Z. and Kamai, T. 2015.\u00a0 Long-runout mechanism and landsliding behaviour of large catastrophic landslide triggered by heavy rainfall in Guanling, Guizhou, China<\/a>. Canadian Geotechnical Journal<\/em>, 52<\/strong> (7), 971-981. https:\/\/doi.org\/10.1139\/cgj-2014-0122<\/a>.<\/p>\n

Yin, Y., Sun, P., Zhu, J. et al.<\/i> 2011. Research on catastrophic rock avalanche at Guanling, Guizhou, China<\/a>. Landslides<\/i> 8, <\/b>517\u2013525. https:\/\/doi-org\/10.100\/s10346-011-0266-8.<\/a><\/p>\n

 <\/p>\n","protected":false},"excerpt":{"rendered":"

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