Tao Li1,2
Chong Xu
Jixiang Xu- 1National Institute of Natural Hazards, Ministry of Emergency Management of China, Beijing, China
- 2Key Laboratory of Compound and Chained Natural Hazards Dynamics, Ministry of Emergency Management of China, Beijing, China
- 3Key Laboratory of Shale Gas and Geoengineering, Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing, China
- 4Institute of Geology, China Earthquake Administration, Beijing, China
The upper reaches of the Yellow River in China, influenced by erosion of the Yellow River and tectonic activities, are prone to landslides. Therefore, it is necessary to investigate the existing landslide traces. Based on visual interpretation on high-resolution satellite images and terrain data, supplemented and validated by existing landslide records, this paper prepared the most complete and detailed landslide traces inventory in Jianzha County, Huangnan Tibetan Autonomous Prefecture, Qinghai Province, to date. The results indicate that within the study area of 1714 km2, there are at least 713 landslide traces, ranging in scale from 3,556 m2 to 11.13 km2, with a total area of 134.46 km2. The total landslide area excluding the overlap area is 126.30 km2. The overall landslide point density and area density in the study area are 0.42 km-2 and 7.37% respectively. The maximum point density and maximum area density of landslide traces in the area are as high as 5.69 km-2 and 98.0% respectively. The landslides are primarily distributed in the relatively low-elevation northeastern part of Jianzha County, characterized mainly by large-scale loess landslides, with 14 landslides exceeding 1×106 m2. This inventory not only supplements the landslide trace data in the transition zone between the Qinghai-Tibet Plateau and the Loess Plateau, but also provides an important basis for subsequent landslide risk zoning, response to climate change, and landscape evolution. Additionally, it holds significant reference value for compiling landslide inventories in similar geological environments.
1 Introduction
Worldwide, mass movements such as landslides are prevalent geological hazards, causing heavy casualties (Petley, 2012; Froude and Petley, 2018). As far as landslide hazards are concerned, China ranks among the regions with the very frequency of landslide hazards globally (Kirschbaum et al., 2015; Xu and Xu, 2021). According to statistics from 2004 to 2016, China experienced 463 fatal landslides not induced by earthquakes, resulting in 4,718 deaths and causing economic losses exceeding 900 million dollars (Zhang and Huang, 2018). Therefore, the prevention and control of landslide hazards is crucial for people’s lives. As a key step in hazard prevention and mitigation, including the analysis of regional landslide distribution patterns, hazard assessments, and risk assessment, the construction of a regional landslide inventory is fundamental and essential. A complete and accurate inventory ensures the objectivity and precision of subsequent work (Xu, 2015; Piacentini et al., 2018).
In the construction of China’s landslide traces inventory, many scholars have carried out a lot of work and made certain progress (Chen et al., 2016; Qiu et al., 2019; Zhao et al., 2019; Zhang et al., 2020). In northwestern China, Huang et al. (2022) compiled a landslide traces inventory for Hualong County, Qinghai Province, consisting of 3,517 landslides through visual interpretation of high-resolution optical images. Furthermore, an in-depth study on the spatial distribution patterns of landslides was conducted based on this inventory. In central China, Li et al. (2022a) primarily utilized visual interpretation, supplemented by existing literature and hazard records, to improve and supplement the landslide traces inventory for Baoji City, Shaanxi Province. The inventory contains a total of 3,422 landslides, providing foundational data for subsequent exploration of the distribution characteristics of large-scale landslides in the region. In the western part of the Qinghai-Tibet Plateau, Cui et al. (2023) employed the Google Earth platform and visual interpretation method to identify landslide traces in the Western Himalayan Syntaxis. They established a landslide traces inventory containing 7,947 landslides. This inventory serves as a support for subsequent landslide hazard assessments. Wu et al. (2016) collected landslide data based on aerial photographs at a scale of 1:50,000 under the conditions of existing data and field survey. They mapped 328 landslides in Gangu County, Gansu Province, providing a crucial foundation for subsequent research. Lan et al. (2004) combined aerial photographs, previous landslide investigation data, and on-site verification to compile a landslide inventory for the Xiaojiang River Basin, including 574 landslide records. They conducted spatial analysis and prediction of landslide based on this inventory. The landslide data sets constructed by these studies, supported by various methods, demonstrate the ability to facilitate subsequent study on landslide in terms of accuracy and completeness. Nevertheless, accurate and complete landslide trace data are still lacking for the entire region of China.
In studies covering Jianzha County, many scholars have carried out identification work on regional landslides, or conducted research on landslide failure patterns, InSAR deformation analysis, geomorphic effects, and other aspects based on landslide data (Ma et al., 2008; Guo et al., 2020a; Wang et al., 2022; Tu et al., 2023). Yin et al. (2014) primarily utilized visual interpretation to identify 508 landslides from Sigou Gorge to Lagan Gorge in the upper reaches of the Yellow River, with many landslides distributed in Jianzha County. Tu et al. (2023) conducted landslide detection in the upper reaches of the Yellow River based on InSAR technology, and carried out detailed deformation analysis of the Lijia Gorge landslides group in Jianzha County. Du et al. (2023) combined InSAR deformation monitoring and optical images to identify 597 landslides in the upper reaches of the Yellow River. Landslides are mainly distributed in Jianzha County and its surrounding areas. Wang et al. (2022) conducted deformation analysis on the Simencun landslide in Jianzha County to explore the relationship between the failure patterns before and after the landslide occurrence. Currently, although many studies have been carried out in Jianzha County based on landslide data. However, the landslide inventory maps produced do not cover the entire Jianzha County, or the landslide data are not complete and detailed enough. Therefore, by combining the visual interpretation of high-resolution optical images with the comparison of existing literature, this study compiled a landslide traces inventory for Jianzha County, Qinghai Province. Additionally, a spatial analysis was performed on the inventory. Finally, the completeness and importance of the landslide inventory are discussed.
2 Study area
Jianzha County has a total area of approximately 1714 km2 and is located in the transitional zone from the upper reaches of the Yellow River on the northeastern edge of the Qinghai-Tibet Plateau to the Loess Plateau (Figure 1) (Ma et al., 2008). For a long time, the landscape evolution of this region has been influenced by the northeastward compression of the Qinghai-Tibet Plateau, resulting in the formation of basin and mountainous topography (Guo et al., 2020a; Peng et al., 2020). The overall terrain in the region is high in the southwest and low in the northeast. The northeastern part is the Qunke-Jianzha Basin, characterized by relatively low elevations and crossed by the main trunk of the Yellow River. On either side, there are two basins, namely, the Guide Basin and the Xunhua Basin. The Yellow River and its tributaries exert strong erosion and incision along the edges of the basins, with cutting depths exceeding 500 m. This has resulted in the formation of numerous erosion and accumulation terraces, as well as steep and rugged slopes, providing favorable conditions for landslide occurrence (Craddock et al., 2010; Guo et al., 2020a; Du et al., 2023).
Figure 1. Location of the study area. Surface wave magnitude (Ms) is a measure of the strength of an earthquake, calculated from surface wave. The larger the value, the stronger the earthquake. Active fault data from Deng (2007).
The study area exhibits undulating and rugged topography with well-developed valleys and gullies. The surrounding active tectonics are developed, with the north part of the area having the Lajishanbeiyuan Fault (LJSBYF) and the Lijishannanyuan Fault (LJSNYF). The NWW-SEE trending Daotanghe-Linxia Fault (DTH-LXF) and NNW-SSE trending Riyueshan Fault (RYSF) pass through the study area. Tectonic activity and climate change contribute to the frequent geological hazards (Yin et al., 2014). The large, extra-large, and giant landslides in the region are typical and representative in China (Guo et al., 2020b; Yin et al., 2021). Some studies suggest that the tectonic uplift of the Qinghai-Tibet Plateau, as an internal dynamic factor, has led to the episodic incision of the Yellow River main and tributary channels, serving as the underlying cause for the formation of giant landslides (Li et al., 2011). As shown in Figure 1, there are several historical earthquakes with Ms greater than 5.0 around Jianzha County. The occurrence of landslides may be related to seismic activity or may be the result of landscape evolution, such as river erosion and high groundwater levels (Guo et al., 2016; Guo et al., 2018).
3 Methods
With the advancement of remote sensing technology and improved transportation accessibility, the main methods for compiling regional landslide inventories currently include field investigation, visual interpretation of satellite images combined with computer, and automatic identification technology. Table 1 summarizes the advantages and disadvantages of the three landslide identification methods. Detailed field investigation can ensure high accuracy for landslide investigations in small-scale areas (Huangfu et al., 2021). However, for large-scale regional landslide investigations, the feasibility of extensive field investigation decreases. This is primarily due to the substantial cost and time required (Peng et al., 2016), as well as the difficulty in accessing rugged landslide sites. With the development of automatic identification technology, it has a significant advantage in quickly obtaining regional landslide data. However, its accuracy may be not very good (Fayne et al., 2019; Zhang et al., 2020; Piralilou et al., 2021; Vecchiotti et al., 2021; Milledge et al., 2022). Combining the strengths of both approaches, the human-computer interaction visual interpretation of satellite images has gradually become an important method for constructing landslide inventory (Xu et al., 2015; Shao et al., 2020; Li et al., 2021; Cui et al., 2022a). This approach requires interpreters to have certain professional background knowledge. Compared to detailed field survey, it sacrifices a small portion of accuracy but significantly improves the efficiency of constructing landslide inventory (Xu et al., 2014b; Cui et al., 2022b; Cui et al., 2022c).
Table 1. Advantages and disadvantages of three landslide identification methods.
This article primarily employed high-resolution optical images overlayed on terrain data for human-computer interactive visual interpretation, and combined existing landslide records in literature for validation and supplementation to construct a landslide traces inventory for Jianzha County. Google Earth Pro platform integrates a vast amount of high-resolution optical satellite image data and allows for the three-dimensional, multi-angle display of landscape by overlaying terrain data (Crosby et al., 2012; Rabby and Li, 2019). This provides extremely convenient conditions for landslide identification. Focusing on the Jianzha County, the image quality is exceptionally high, with 100% satellite image coverage and 0% cloud coverage. Therefore, we performed repetitive basic work on landslide interpretation based on the Google Earth Pro for inventory construction. First of all, the shape and boundary of the landslide can be easily determined based on the differences between the texture, tone, shadow and vegetation development on the satellite images and the surrounding environment, combined with terrain differences and multi-angle observation. Secondly, many existing literature findings on landslides in the region will be conducted to check and supplement the inventory for ensuring the completeness and objectivity. Because different landslides have different topographic and geomorphic characteristics, there is no uniform standard applicable to the interpretation of all landslide traces. Here, some common landslide features used in landslide interpretation are listed: 1) Having an obvious armchair-shaped back wall and the phenomenon of double grooves homologous; 2) Depression in the source area, prominent topography in the accumulation area, accompanied by a distinct landslide boundary; 3) Obvious displacement between the landslide body and the surrounding environment, accompanied by cracks or differences in elevation; 4) The source area shows a brighter color, and the accumulation has transverse fissures and appears tongue-shaped; 5) Irregular stepped appearance in the accumulation body, with the terraces possibly transformed into residential areas or farmland.
4 Results and analysis
4.1 Landslide traces inventory
The landslide inventory serves as a crucial foundation for regional landslide risk assessment and prevention. Many scholars have conducted regional or individual landslide studies in Jianzha County (Yin et al., 2014; Guo et al., 2020b; Du et al., 2023; Tu et al., 2023). Although the study areas of these studies cover or partially cover Jianzha County, most have not established a complete landslide traces inventory that fully encompasses Jianzha County. Table 2 presents selected existing landslide records in Jianzha County. After objectively supplemented and validated by these records, the landslide inventory constructed in this study contains a total of 713 landslide traces (Figure 2). The total area of these landslides is 134.46 km2. The total landslide area excluding the overlap area is 126.30 km2, accounting for 7.37% of the study area. The average landslide area is approximately 0.19 km2, with a minimum of 3,556 m2 and a maximum of 11.13 km2. It can be found that landslides mainly occur on the slopes of the relatively low-elevation ridges in the northeastern part of Jianzha County. These landslides are widely distributed in towns such as Kanbula, Jiajia, Cuozhou, Maketang, and Angla, with a predominance of large-scale landslides. In the southwest, where the altitude is relatively high, landslides are sparsely distributed.
Table 2. Selected recorded landslides in Jianzha County.
Figure 2. Spatial distribution map of landslide traces.
4.2 Typical landslide display
In order to more intuitively display the landslides, several typical landslides were selected within the study area for display (Figure 3). It can be found that the predominant landslide type is loess landslide. The landslide boundary is easily identified based on the discontinuity in texture and shape between the deposits and the surrounding environment. The material movement along the slope is evident. The displacement between the landslide deposits and the boundary visually demonstrates the movement direction and shape of the landslide. Over time, traces of human activity become visible on the deposits. After reconstruction, roads and buildings of various sizes are distributed across the deposits. These typical landslide examples can clearly capture the landslide morphology and material movement traces, which is of great value for the study of regional landslide failure mechanisms.
Figure 3. Display of seven typical landslide traces in the study area.
4.3 Landslide density statistics
In order to quantitatively analyze the spatial distribution of landslides, landslide point density and area density are used to characterize the distribution and aggregation of landslides. After kernel density calculation with the search radius set to 2 km, the results are shown in Figure 4. High point density areas are primarily concentrated in the northeastern part of the study area (Figure 4A), with the maximum density reaching 5.69 km-2. This indicates that landslides in these areas are numerically dominant. The maximum landslide area density is 98.0% (Figure 4B). High area density areas are different from high point density areas in distribution. For instance, landslide area density is more significant relative to point density in areas close to the Kanbula Town. This indicates that the landslides in this area tend to be larger in scale.
Figure 4. Landslide density map. (A) point density map; (B) area density map.
5 Discussion
5.1 Landslide scale and the completeness analysis
To explore the scale of landslides in Jianzha County, the cumulative landslide number was plotted against the landslide area in a double logarithmic coordinate system to show the relationship between them (Figure 5). Where N represents the number of landslides exceeding a given area, A. It can be observed that the majority of landslides have a scale smaller than 1×106 m2, with only 14 landslides exceeding 1×106 m2 in scale. The fitting formula for all landslides is
Figure 5. Curve depicting correlation between the cumulative landslide number and the landslide area.
As shown in Figure 5, landslides with an area greater than 1×105 m2 are fitted as
5.2 Objective assessment of methods
A complete and detailed landslide inventory is of great significance for regional landslide research and risk management. The human-computer interaction visual interpretation method, as one of the primary approaches for establishing regional landslide inventory, possesses advantages that are irreplaceable by field investigation and automatic identification techniques (Guzzetti et al., 2012; Tian et al., 2019; Xu et al., 2020). While this study primarily relied on such a method to construct a relatively objective landslide traces inventory for Jianzha County, there are still some limitations. For small-scale landslides, due to the resolution limitations of satellite images, the coverage of topographic and geomorphic features, and the subjective factors from interpreters, it is inevitable that landslides with unclear identification characteristics will be missed. Compared with detailed field investigation, the visual interpretation method consumes less cost and time. Compared with automatic identification method, it is superior in accuracy and is currently a widely used method for identifying regional landslides (Cui et al., 2021; Li et al., 2022a; Sun et al., 2024). This method sacrifices some accuracy compared to field investigation, but greatly improves efficiency. Balancing the efficiency of automatic identification and the accuracy of field investigation is an exploratory and challenging task.
5.3 The importance of the landslide inventory
Landslide susceptibility refers to the probability of slope failure in a specific geological environment without considering triggering factors (Akgun, 2012; Nikoobakht et al., 2022). As a fundamental component, landslide inventory plays an indispensable role in landslide susceptibility assessment. It provides essential information about landslides, including the number, scale, location. Based on landslide inventory, one can select a single assessment method and specific influencing factors for landslide susceptibility assessment (Huangfu et al., 2021; Nanehkaran et al., 2021; Cemiloglu et al., 2023). Alternatively, one can choose several different assessment methods for comparative analysis to find the optimal results (Azarafza et al., 2021; Nanehkaran et al., 2022; Mao et al., 2024). With the development of landslide assessment, machine learning has demonstrated outstanding performance among many methods, gradually becoming the preferred approach for assessment (Nanehkaran et al., 2023). Based on susceptibility assessment, triggering factors are added to evaluate landslide hazard, while carrier indicators are added for vulnerability assessment. Risk assessment is then performed by overlaying hazard and vulnerability. However, regardless of which assessment method is chosen and which landslide influencing factors are considered, the susceptibility assessment, hazard assessment, vulnerability assessment, and risk assessment all need to be based on landslide data. The landslide inventory can not only be used to validate the results obtained through predictive modeling, but also provide an important reference for exploring factors involved in the occurrence of new landslides. Many studies have been carried out on incomplete landslide inventories and updated the inventories, effectively enhancing the understanding of subsequent landslide development and assessment research. For example, the Hokkaido earthquake (Kasai and Yamada, 2019; Cui et al., 2021), Wenchuan earthquake (Dai et al., 2011; Xu et al., 2014a), and Jiuzhaigou earthquake (Tian et al., 2019; Sun et al., 2024). The work of compiling a complete and detailed landslide inventory is not only of great value and significance, but also has important supporting value for subsequent research on landslide failure mechanisms, landscape evolution, especially landslide susceptibility assessment.
6 Conclusion
This study established a landslide traces inventory in Jianzha County, Qinghai Province, China, and conducted a statistical analysis of their number, area, and density. A total of 713 landslides were identified, mainly loess landslides. The total area of landslides is 134.46 km2, ranging in scale from 3556 m2 to 11.13 km2. The landslides are primarily concentrated in the low-elevation regions of the northeastern part of the study area. This inventory is more similar in scale and completeness to other loess landslide inventories. Furthermore, it is more complete and detailed than previous landslide traces records in Jianzha County. The study compiled the most complete and detailed landslide traces inventory in Jianzha County so far, which is of great significance to landslide scientific research. In future, relevant research on loess landslide development characteristics, failure mechanisms, susceptibility assessment and risk zoning can be conducted based on this landslide inventory.
Data availability statement
The raw data supporting the conclusion of this article will be made available by the authors, without undue reservation.
Author contributions
TL: Investigation, Visualization, Writing–original draft. CX: Conceptualization, Resources, Writing–review and editing. LL: Investigation, Writing–review and editing. JX: Investigation, Writing–review and editing.
Funding
The author(s) declare financial support was received for the research, authorship, and/or publication of this article. This work was supported by the National Institute of Natural Hazards, Ministry of Emergency Management of China (2023-JBKY-57) and the National Natural Science Foundation of China (42077259).
Acknowledgments
Deep thanks are extended to the reviewers for their beneficial review and valuable comments.
Conflict of interest
The authors declare that the research was conducted in the absence of any commercial or financial relationships that could be construed as a potential conflict of interest.
The author(s) declared that they were an editorial board member of Frontiers, at the time of submission. This had no impact on the peer review process and the final decision.
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Keywords: landslide traces inventory, upper reaches of the yellow river, loess landslides, Jianzha County, visual interpretation
Citation: Li T, Xu C, Li L and Xu J (2024) The landslide traces inventory in the transition zone between the Qinghai-Tibet Plateau and the Loess Plateau: a case study of Jianzha County, China. Front. Earth Sci. 12:1370992. doi: 10.3389/feart.2024.1370992
Received: 15 January 2024; Accepted: 19 March 2024;
Published: 05 April 2024.
Edited by:
Paul Sestras, Technical University of Cluj-Napoca, RomaniaReviewed by:
Mohammad Azarafza, University of Tabriz, IranHuajin Li, Chengdu University, China
Sanda Rosca, Babeș-Bolyai University, Romania
Copyright © 2024 Li, Xu, Li and Xu. This is an open-access article distributed under the terms of the Creative Commons Attribution License (CC BY). The use, distribution or reproduction in other forums is permitted, provided the original author(s) and the copyright owner(s) are credited and that the original publication in this journal is cited, in accordance with accepted academic practice. No use, distribution or reproduction is permitted which does not comply with these terms.
*Correspondence: Chong Xu, xc11111111@126.com