Integrating an interferometric synthetic aperture radar technique and numerical simulation to investigate the Tongmai old deposit along the Sichuan-Tibet Railway

Li, Zhihai; Wang, Qing; Zhou, Fanqin; Li, Yuchao; Han, Xudong; Mehmood, Qaiser; Cao, Chen; Gu, Feifan; Han, Mengxia; Chen, Jianping

doi:10.1016/j.geomorph.2020.107586

Cited by 13 publications

(5 citation statements)

References 43 publications

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“…The results of elevation and dating analysis showed that the river blocking occurred in WDL I reach about 6300 years ago, WDL II reach about 1900 years ago, RCR reach around 1300 -1400 years ago, SWL reach about 1370 ago, SDX reach about 750 years ago (a time away from today) and 510 (a time close to today), and GD river blocking time was about 900 years ago. The formation of these barrier lake led to the decrease of river dynamics and river deposition effect, which may be an important reason for the inhibition of river channel incision and directly affect the evolution of local landscape (Li et al 2021). From this perspective, the above results were also well veri ed by geological phenomena, knickpoints and accumulation deformation.…”

Section: Discussionmentioning

confidence: 79%

Sequence Analysis of Several Ancient River Blocking Events in the Suwalong Reach of the Upper Jinsha River Based on Multidisciplinary Approaches, SE Tibetan Plateau

Zhang

Chen

Wang

et al. 2021

Preprint

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The temporary or permanent river blocking event caused by mass movement usually occurs on steep terrain. With the increase of mountain population and land use pressure and the construction of water conservancy and hydropower projects, river blocking event has gradually attracted people’s attention and understanding. The study area (Wangdalong-Gangda reach) is located in the upper reaches of the Jinsha River and the southeast edge of the Qinghai-Tibet Plateau. Affected by strong tectonic activity in the Jinsha River suture zone and the rapid uplift of the Tibetan Plateau, in the past 6000 years, there have been at least five obvious river blocking events in the reach of about 30 km in the study area. The number and density are very rare. Combined with the field investigation, indoor interpretation, laboratory tests, optically stimulated luminescence (OSL) dating, SBAS-InSAR and previous studies, multidisciplinary approaches are used to systematically summarize the analysis methods and further the understanding of one river blocking event and multiple river blocking events from difference perspectives. Especially in multiple river blocking events, we could get the wrong results, even the opposite conclusion if interaction is not considered. Through this study, the general method of analyzing the river blocking event and the problems that should be paid attention to in sampling are given, and relatively reliable historical results of river blocking events are obtained. This method has extensive applicability to the identification and analysis of river blocking events in other areas.

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Section: Discussionmentioning

confidence: 79%

Sequence Analysis of Several Ancient River Blocking Events in the Suwalong Reach of the Upper Jinsha River Based on Multidisciplinary Approaches, SE Tibetan Plateau

Zhang

Chen

Wang

et al. 2021

Preprint

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“…The Milin fault exhibited significant activity during the Late Pleistocene and Holocene, while the Lulang and Jiali faults are considered Holocene active faults (e.g., Li et al, 2017; Xie, 2018). The frequent tectonic activities in the study area are important factors contributing to the occurrence of numerous ancient landslides within the region, such as the Delun, Lulang and Tongmai landslides (e.g., Li, Chen, et al, 2021; Li, Wang, et al, 2021; Wang et al, 2021). For example, the Delun landslide occurred downstream of the BALD more than 7.1 ka ago (Wang et al, 2021).…”

Section: Discussionmentioning

confidence: 99%

“…Quaternary glacial activity studies have shown that since the Late Pleistocene, a large number of highly dynamic glaciers have been formed in the Gyala Peri block where the study area is located (e.g., Korup et al, 2010; Korup & Montgomery, 2008; Owen & Benn, 2005; Wang et al, 2021), with glacial termini below 3000 m. The glacial landform in the source area of the BALD (Figure 3a,c) and the terrace‐like topographic features on the surface of the BALD (Figure 3b) indicate that the formation and evolution of the landslide were strongly influenced by glacial activity and glacial alternation. In addition, other ancient landslides in adjacent areas, such as the Lulang, Tongmai, Chada and Yigong ancient landslides, had an active history in the Late Pleistocene or Holocene, and were significantly affected by glaciation (e.g., Guo et al, 2020; Li, Wang, et al, 2021; Zhang et al, 2022).…”

Section: Discussionmentioning

confidence: 99%

Deformation characteristics and reactivated failure modes of the massive Baimu ancient landslide deposit on the northern margin of the East Himalayan syntaxis

Li,

Chen,

Zhou

et al. 2024

Earth Surf Processes Landf

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In the Eastern Himalayan syntaxis, massive Quaternary loose deposits represent a typical product of abrupt topographic changes. Influenced by the Qinghai‐Tibet Plateau uplift and rapid river incision, the partial or complete failure of these deposits is a recurrent phenomenon in alpine‐gorge regions, posing substantial threats to major infrastructure development. Through topographic interpretation and field investigation, this study clarifies the geological features and genetic mechanisms of the Baimu ancient landslide deposit (BALD), located on the northern margin of the East Himalayan syntaxis. The surface deformation time series spanning October 2017 to December 2019 was estimated using employing multitemporal synthetic aperture radar interferometry. Then, the spatiotemporal deformation characteristics of the BALD was analysed by superposing terrain factors, and hazard division was implemented. The results indicate that high‐hazard zones are mainly distributed on high and steep free faces of the BALD. Deformation evolution and rainfall time series showed obvious correlation. Lastly, a generalized failure model is established for the BALD, which will serve as a valuable reference for disaster prevention and is applicable to the study of similar deposits in the Qinghai‐Tibet Plateau.

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“…Most previous studies depend on census data at a sub-district level [27][28][29], or divide the research region into grids and distribute the population to each grid evenly. In recent years, the use of big data to modify traditional processed data has emerged as a new trend in geographic research [30], allowing for a finer scale of research.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Park Accessibility Based on Improved Gaussian Two-Step Floating Catchment Area Method: A Case Study of Xi’an City

Xie

Sun

et al. 2022

Buildings

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Park accessibility plays a critical role in evaluating the quality of park construction. However, the conventional accessibility model ignores non-spatial factors, so it is crucial to use more complex methods for evaluating park accessibility. This study aims to establish an improved Gaussian-based two-step floating catchment area method (iG2SFCA) based on Point of Interest (POI), population data and Baidu map, to measure the park accessibility of various travel modes (walking, riding and driving modes) in 5-min, 15-min and 30-min scenarios, and location quotient is used to assess spatial equity of parks. The results show that: (1) There are clear disparities between park supply and population demand at the street level. (2) iG2SFCA evaluates the level and attractiveness of the park comprehensively. It is more sensitive to identifying accessibility, which can lead to a more realistic assessment of Park accessibility. (3) Under the three modes of transportation, the accessible area of the park increases with time, and the accessibility difference between residential areas is the smallest under the 30-min scenario. Overall, accessibility of park is relatively high; however, there is an obvious tendency for the accessibility level to decrease from the park as the center. The areas with poor accessibility appear in the north and southeast of the research area. (4) There are regional variances in the spatial equity of parks within Xi’an 3 City, and the park configuration needs to be optimized. These findings can provide theoretical support for further optimizing the layout of park in Xi’an in order to improve the spatial equity of urban parks.

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Integrating an interferometric synthetic aperture radar technique and numerical simulation to investigate the Tongmai old deposit along the Sichuan-Tibet Railway

Cited by 13 publications

References 43 publications

Sequence Analysis of Several Ancient River Blocking Events in the Suwalong Reach of the Upper Jinsha River Based on Multidisciplinary Approaches, SE Tibetan Plateau

Sequence Analysis of Several Ancient River Blocking Events in the Suwalong Reach of the Upper Jinsha River Based on Multidisciplinary Approaches, SE Tibetan Plateau

Deformation characteristics and reactivated failure modes of the massive Baimu ancient landslide deposit on the northern margin of the East Himalayan syntaxis

Evaluation of Park Accessibility Based on Improved Gaussian Two-Step Floating Catchment Area Method: A Case Study of Xi’an City

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