scholarly journals A large landslide in Zigui County, Three Gorges area

2004 ◽  
Vol 41 (6) ◽  
pp. 1233-1240 ◽  
Author(s):  
F C Dai ◽  
J H Deng ◽  
L G Tham ◽  
K T Law ◽  
C F Lee
Keyword(s):  
Clayey Soil ◽  
Landslide Dam ◽  
Bedding Plane ◽  
Raw Material ◽  
Left Bank ◽  
Three Gorges ◽  
Shear Surface ◽  
Three Gorges Area ◽  
Dam Breaching ◽  
Large Landslide

On 13 July 2003, a landslide with a volume of approximately 20 × 106 m3 occurred on the left bank of the Qinggan River, Zigui County, Hubei Province, China. As a result, 14 people died and 10 people are missing. A landslide dam was formed, blocking the Qinggan River. A channelized diversion was constructed for prevention of upstream flooding and damage downstream caused by dam breaching. The landslide was a typical translational rockslide in weathered shale and sandstone, a block of which slipped down along the bedding plane. It is estimated that the landslide was caused by the combined effect of the following factors: (i) a bedding plane between incompetent weathered shale and competent sandstone that daylights at or is shallowly buried at the bottom of the Qinggan River; (ii) a thin layer of clayey soil acting as the slip plane that is likely a preexisting shear surface; (iii) excavation of the shale as raw material for brick fabricating on the slope; and (iv) a combination of prolonged rainfall and reservoir impounding.Key words: landslide, landslide dam, rainfall, impounding, Three Gorges area.

scholarly journals Geomorphic effects of recurrent outburst superfloods in the Yigong River on the southeastern margin of Tibet

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Kaiheng Hu ◽  
Chaohua Wu ◽  
Li Wei ◽  
Xiaopeng Zhang ◽  
Qiyuan Zhang ◽  
...  
Keyword(s):  
Landslide Dam ◽  
Upstream Migration ◽  
One Dimensional ◽  
Landform Evolution ◽  
Outburst Floods ◽  
Stepwise Method ◽  
Large Landslide ◽  
Southeastern Margin ◽  
Channel Slope ◽  
The One

AbstractLandslide dam outburst floods have a significant impact on landform evolution in high mountainous areas. Historic landslide dams on the Yigong River, southeastern Tibet, generated two outburst superfloods > 105 m3/s in 1902 and 2000 AD. One of the slackwater deposits, which was newly found immediately downstream of the historic dams, has been dated to 7 ka BP. The one-dimensional backwater stepwise method gives an estimate of 225,000 m3/s for the peak flow related to the paleo-stage indicator of 7 ka BP. The recurrence of at least three large landslide dam impoundments and super-outburst floods at the exit of Yigong Lake during the Holocene greatly changed the morphology of the Yigong River. More than 0.26 billion m3 of sediment has been aggraded in the dammed lake while the landslide sediment doubles the channel slope behind the dam. Repeated landslide damming may be a persistent source of outburst floods and impede the upstream migration of river knickpoints in the southeastern margin of Tibet.

Rainfall regime in Three Gorges area in China and the control factors

2009 ◽  
Vol 30 (9) ◽  
pp. 1396-1406 ◽  
Author(s):  
Zhao Fang ◽  
Deng Hang ◽  
Zhao Xinyi
Keyword(s):  
Rainfall Regime ◽  
Three Gorges ◽  
Three Gorges Area ◽  
Control Factors

Environmental emigration stress of slope farmland in the Three Gorges area

2002 ◽  
Vol 12 (4) ◽  
pp. 420-426 ◽  
Author(s):  
Wang Liming ◽  
Guan Qingfeng ◽  
Yang Yanfeng
Keyword(s):  
Three Gorges ◽  
Three Gorges Area ◽  
The Three Gorges ◽  
Slope Farmland

Assessing Collembola Biodiversity Under Human Influence at Three Gorges Area, China

2013 ◽  
Vol 42 (2) ◽  
pp. 214-222 ◽  
Author(s):  
Cheng Huang ◽  
Tianle Wang ◽  
Yongzheng Luo ◽  
Shi Chen ◽  
Ke Chung Kim
Keyword(s):  
Three Gorges ◽  
Human Influence ◽  
Three Gorges Area

scholarly journals Contributing factors to the failure of an unusually large landslide triggered by the 2014 Ludian, Yunnan, China, <i>M</i><sub>s</sub>  =  6.5 earthquake

2016 ◽  
Vol 16 (2) ◽  
pp. 497-507 ◽  
Author(s):  
Z. F. Chang ◽  
X. L. Chen ◽  
X. W. An ◽  
J. W. Cui
Keyword(s):  
Crustal Deformation ◽  
Landslide Dam ◽  
Debris Avalanche ◽  
Contributing Factors ◽  
Ground Shaking ◽  
Field Investigations ◽  
Rock Structure ◽  
Large Landslide ◽  
Weak Interlayer ◽  
Steep Slopes

Abstract. The 3 August 2014 Ludian, China, Ms  =  6.5 earthquake caused many large landslides. The biggest occurred at Hongshiyan near the epicenter, had a volume of 1.0  ×  107 m3 and dammed the Niulanjiang River, creating a large lake. Post-event field investigations yielded detailed data on the following aspects: rock structure of the landslide, the local lithology and geometry of the area around the landslide dam and composition and grain sizes of the debris avalanche. Based on these data, this work analyzes the geology and topography of the Hongshiyan area, and explores reasons for the occurrence of an unusually large landslide at this location. Our analysis suggests the following conditions are responsible for this catastrophic event. (1) Due to recent crustal deformation, intense incision on the river increased topographic relief with steep slopes and scarps. (2) Combined structures, including unloading fissures, high-angle joints and low-angle beds along the river, as well as an upper-strong and lower-weak interlayer structure on the slope, especially the existence of weak layers in the slope, are important factors that contribute to this large failure. (3) Hongshiyan lies near an active fault, where intense crustal deformation has resulted in rock fractures and weathering, and frequent earthquakes may progressively reduce the strength of the slope. (4) During the Ms  =  6.5 earthquake, the terrain and site conditions led to abnormally strong ground shaking. The combined impacts of these factors triggered a very large landslide during a moderate-sized earthquake.

Sign in / Sign up

Export Citation Format

Share Document