Characteristics and geomorphology change detection analysis of the Jiangdingya landslide on July 12, 2018, China
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Shuyue Ma I Haijun Qiu I Sheng Hu I Dongdong Yang I Zijing Liu
Characteristics and geomorphology change detection analysis of the Jiangdingya landslide on July 12, 2018, China
Abstract The reactivation of landslides has always been a prominent problem that has endangered town construction and people’s safety worldwide. At about 8 a.m. on July 12, 2018, on a mountain near the Bailong River in Nanyu Township, Zhouqu County, Gansu Province, China, a landslide collapse event occurred. About 10,000 m3 of sloped material slid into the Bailong River, with the largest stone reaching 3 m3. As a result, a large number of houses were flooded. Highways and bridges were destroyed. Using field investigations, unmanned aerial vehicle (UAV) photography, InSAR traces, historical records, and multiple remote sensing images, we extracted the landslide’s geometry and geomorphic parameters to quantify the characteristics of the Jiangdingya landslide. Based on high-resolution topographic data collected before and after the landslide, the change in the geomorphological factors, geomorphologic stability, and detection of the precursory motion before the landslide failure were analyzed to fully investigate the temporal geomorphological changes. Synthesizing the above research, we discuss the causes of landslide reactivation. The Jiangdingya landslide is a typical ancient landslide formed by the coupling of internal and external dynamics. Rainfall, seismic fault zone activity, human activities, and river erosion were the main causes of this reactivation event. Keywords Ancient landslide, . Reactivation, . Geomorphological changes, . UAVs . InSAR Introduction Zhouqu County, China, which is located in the North-South seismic belt, is affected by neotectonic movement with frequent earthquakes occurring since ancient times (Wang et al. 1994). Due to this seismic activity, geological disasters such as landslides, collapses, and debris flows have frequently occurred in Zhouqu County (Zhang and Huang 2018). In particular, the 2008 Wenchuan earthquake caused the collapse of many mountain slopes, the loosening of hillside deposits, and signs of reactivation in a large number of ancient landslides (Yang et al. 2014). The term “ancient landslides” generally refers to landslides that have slipped since the Quaternary, and they are the product of the long-term complex evolution of slopes (Zhang et al. 2018; Guo et al. 2019). Ancient landslide reactivation has seriously threatened the safety of the people’s lives and property. For example, the Baitukan landslide in Kangding was partially reactivated in 1995, causing 33 deaths, injuring more than 100 people, and directly leading to the loss of 560 million Yuan (Yuan et al. 1998). The Cuifeng mountain landslide (Song 2014), the Beishan landslide (Xu 2015), the Shanmaoding #1 landslide (Fu 2017), and the landslide in Yanwotou, Luzhou, Sichuan (Zeng 2010) are all typical ancient landslide reactivation events, which destroyed buildings and roads, causing casualties and property losses.
At about 8 a.m. on Ju
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