Lake outburst accelerated permafrost degradation on Qinghai-Tibet Plateau

Lü, Ping; Han, Jiangping; Li, Zhenshi; Xu, Runze; Li, Rongxing; Tu, Hao; Qiao, Gang

doi:10.1016/j.rse.2020.112011

Cited by 76 publications

(42 citation statements)

References 81 publications

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“…The Xiakou landslide, the subject of this study, is located in the Longxi River basin that administratively belongs to Ya'an City, approximately 130 km from Chengdu, the capital city of Sichuan Province (Figure 1). This region, like other sites in the Qinghai‐Tibetan Plateau, is currently facing dynamic climate change, which may further amplify the influences of natural hazards, such as accelerated ground deformations resulting from increased air and ground temperatures (Lu et al, 2020; Lu, Han, Hao, Li, & Qiao, 2020). The Longxi River basin is a long and narrow valley with an area of approximately 180 km 2 .…”

Section: Study Sitementioning

confidence: 99%

Modern reactivations of a thick colluvial landslide reconstructed from dendrochronology: the example of the Xiakou landslide, China

Bai

Lü

2021

Land Degrad Dev

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In this study, we investigated two types of growth disturbance (GD) in tree‐ring sequences, namely, the abrupt growth reduction in annual tree‐ring width, and the formation of reaction wood, in tree stems growing on the thick colluvial Xiakou landslide in China. In total, 96 GDs were identified in 183 core samples that were acquired from the 81 trees on the Xiakou landslide, revealing nine reactivation phases of the landslide body over the past 30 years. These reactivations were found to have occurred in the years of 1987, 1988, 1989, 1992, 1993, 1995, 1997, 2006, and 2007. Further hazard analysis indicated that the probability of landslide reactivation in 20 years was highest in the upper body of the landslide and on the boundaries where the new and old landslides meet. In contrast, the most stable region was the lower landslide body. Under the circumstances of an extreme lack of historical data, this work demonstrated the usefulness of dendrochronology in reconstructing modern reactivations over the past 30 years for a giant, deep‐seated, colluvial landslide with a volume exceeding approximately 10 million m3. This study has broader impacts because landslides in colluvium are a globally common types of land degradation.

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Section: Study Sitementioning

confidence: 99%

Modern reactivations of a thick colluvial landslide reconstructed from dendrochronology: the example of the Xiakou landslide, China

Bai

Lü

2021

Land Degrad Dev

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“…The level 1 single look complex (SLC) images of Envisat with VV polarization were selected to monitor surface deformation. As for Sentinal-1, the interferometric wide-swath (IWS) mode is adopted as the main acquisition mode, which has a unique azimuth data acquisition mode of Terrain Observation with Progressive Scans (TOPS) (Wegnüller et al, 2016;Lu et al, 2020b).…”

Section: Sar Imagesmentioning

confidence: 99%

“…The final step was to convert the phase signals to cumulative surface deformations along the line of sight. A detailed description of the SBAS-InSAR processing can be found in our previous study (Lu et al, 2020b).…”

Section: Seasonal Deformation Model Based On Insarmentioning

confidence: 99%

Active Layer Thickness Retrieval Over the Qinghai-Tibet Plateau From 2000 to 2020 Based on Insar-Measured Subsidence and Multi-Layer Soil Moisture

Chang

Han

et al. 2021

Int. Arch. Photogramm. Remote Sens. Spatial Inf. Sci.

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Abstract. Active layer thickness (ALT) is an important index to reflect the stability of permafrost. The retrieval of ALT based on Interferometric Synthetic Aperture Radar (InSAR) technology has been investigated recently in permafrost research. However, most of such studies are carried out in a limited extend and relatively short temporal coverage. The combination of temporal-spatial multi-layer soil moisture data and multi-temporal InSAR is a promising approach for the large-scale characterization of ALT. In this study, we employed Small Baseline Subset Interferometry (SBAS-InSAR) technology to obtain the seasonal surface deformation from radar images of Envisat and Sentinel-1 in a permafrost region of Qinghai-Tibet Plateau (QTP). We attempt to verify and calibrate the temporal-spatial multi-layer soil moisture product in combination with the in-situ data. Based on the land subsidence data and the temporal-spatial multi-layer soil moisture data, we further improve method to retrieve the ALT information. This paper describes the progress so far and point out the future work.

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“…In China, the permafrost area accounts for 22% of the total land area, which is mainly distributed on the Qinghai-Tibet Plateau (QTP), the Northeastern China, and the high mountain areas in the Northwestern China. With an average elevation of more than 4000 m, the QTP has the largest distribution of altitudinal permafrost on earth [5]. Compared with latitudinal permafrost in the Northern America and Siberia, the permafrost on the QTP is characterized with high temperatures and thermal unstable, thus being more sensitive to climatic changes and human activities [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

“…At present, the four lakes are already connected together, and the first three ones lost their storage functions, making the Yanhu Lake become a tailend-lake [21][22][23][24]. From 2011 to 2019, the surface area of the Zonag Lake decreased from 269 to 150 km 2 , while the surface area of Yanhu Lake increased by almost 3 times from 73 to 209 km 2 [5,25]. Considering the rapid changes, some researchers conducted predictions and concluded that an overflow would occur to the Yanhu Lake in a minimum of one to two years [21].…”

Section: Introductionmentioning

confidence: 99%

Long‐Term Thermal Regimes of Subgrade under a Drainage Channel in High‐Altitudinal Permafrost Environment

Han²,

et al. 2021

Advances in Materials Science and Engineering

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In permafrost regions, construction of a channel involves a large amount of excavation activities and changes to surface water body, which can exert great impacts on the thermal regimes of permafrost underlying. In this paper, a coupled mathematical model of heat and moisture transfer was constructed for freeze-thaw soils to investigate the long-term thermal regimes of subgrade beneath a drainage channel built on the Qinghai-Tibet Plateau. Based on the numerical simulations, the thermal regimes of the subgrade both in warm and cold seasons were analyzed within a period of 50 years, as well as the impact of the widths of the channel. The results showed that the channel excavation and flowing water within could lead to a significant underlying permafrost degradation. During the first 30 years, the permafrost beneath the channel mainly experienced a rapid downward degradation. After that, the lateral thermal erosion of the flowing water led to a rapid permafrost degradation beneath the slope of the channel. In cold seasons, the shallow ground beneath the channel would not refreeze due to the flowing water and the thaw bulb actually expanded throughout the year. For the channel with a bottom width of 15 m, the thaw bulb beneath the channel could expand laterally to the natural ground about 10 m far away from the slope shoulder of channel till the 50th year. With different widths, the long-term thermal regimes of the subgrade beneath the channels differed considerably and the maximum difference was at the slope toe of the embankment. With the numerical simulated results, it is recommended that a channel built on permafrost should be wide-and-shallow rather than narrow-and-deep if conditions permit.

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Lake outburst accelerated permafrost degradation on Qinghai-Tibet Plateau

Cited by 76 publications

References 81 publications

Modern reactivations of a thick colluvial landslide reconstructed from dendrochronology: the example of the Xiakou landslide, China

Modern reactivations of a thick colluvial landslide reconstructed from dendrochronology: the example of the Xiakou landslide, China

Active Layer Thickness Retrieval Over the Qinghai-Tibet Plateau From 2000 to 2020 Based on Insar-Measured Subsidence and Multi-Layer Soil Moisture

Long‐Term Thermal Regimes of Subgrade under a Drainage Channel in High‐Altitudinal Permafrost Environment

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