Comparison and Analysis of Permafrost Railway Subgrade Settlement Deformation Monitoring

2012 ◽  
Vol 226-228 ◽  
pp. 1651-1654 ◽  
Author(s):  
Qu Lin Tan ◽  
Chou Xie
Keyword(s):  
Safety Management ◽  
Test Site ◽  
Deformation Monitoring ◽  
Tibet Plateau ◽  
Crushed Rock ◽  
Permafrost Region ◽  
Railway Bridge ◽  
Deformation Amount ◽  
Engineering Significance ◽  
Interferometric Sar

Under inclement Qinghai-Tibet plateau environment, monitoring and analysis of railway subgrade deformation in plateau permafrost region has very important engineering significance for stability evaluation and safety management. In the paper, satellite interferometry was applied to measure subgrade deformation in the Beiluhe test site along the Qinghai-Tibet railway with gathered satellite interferometric SAR images. Based on the satellite-interferometry-derived data, the deformation characteristics of six points in different permafrost subgrades (the sliced rock embankment, the crushed rock embankment and railway bridge) along the Qinghai-Tibet railway were analyzed and compared. The analysis results show that settlement is the main behavior of railway subgrade deformation and the deformation amount of railway bridge is less than the sliced or the crushed rock embankment along the Qinghai-Tibet railway in permafrost regions.

Preliminary Result of Permafrost Roadbed Settlement Measurement Using Satellite D-InSAR Technology

2011 ◽  
Vol 105-107 ◽  
pp. 1912-1915
Author(s):  
Qu Lin Tan ◽  
Chou Xie
Keyword(s):  
Safety Management ◽  
Test Site ◽  
Deformation Monitoring ◽  
Ground Subsidence ◽  
Crushed Rock ◽  
Stable Phase ◽  
Permafrost Region ◽  
Time Deformation ◽  
Deformation Amount ◽  
Long Time

Monitoring ground subsidence of roadbed in permafrost region is very important for stability evaluation and safety management. To test its applicability to deformation monitoring for railway subgrade settlement in plateau permafrost region, satellite differential interferometric synthetic aperture radar technology (D-InSAR) has been applied to detect subgrade deformation in one test site along the Qinghai-Tibet railway with gathered interferometric SAR images. The preliminary experimental results showed that satellite D-InSAR technology can effectively acquire long-time deformation sequence through analyzing the ground scatterers with relative stable phase and are in accordance with the results obtained by conventional in-situ ground leveling. Along the Qinghai-Tibet railway in permafrost regions, it is found that settlement is the main behavior of subgrade deformation and the deformation amount of railway bridge is less than the sliced or the crushed rock embankment. It has very important engineering significance for state key infrastructure long-term monitoring system in plateau permafrost region.

scholarly journals SURFACE DEFORMATION MONITORING IN PERMAFROST REGIONS OF TIBETAN PLATEAU BASED ON ALOS PALSAR DATA

2017 ◽  
Vol XLII-2/W7 ◽  
pp. 1509-1512
Author(s):  
L. M. Chen ◽  
G. Qiao ◽  
P. Lu
Keyword(s):  
Structural Damage ◽  
Large Scale ◽  
Surface Deformation ◽  
Deformation Monitoring ◽  
Frozen Soil ◽  
Tibet Plateau ◽  
Temperature Deformation ◽  
Deformation Pattern ◽  
Permafrost Region ◽  
Freeze Thaw

The permafrost region of Qinghai-Tibet Plateau is widely distributed with the freeze/thaw processes that cause surface structural damage. The differential interferometry synthetic aperture radar (DInSAR) can detect large scale surface deformation with high precision, thus can be used to monitor the freeze/thaw processes of frozen soil area. In this paper, the surface deformation pattern of Qinghai-Tibet railway was analyzed by using the PALSAR 1.0 raw data of the ALOS satellite (L band) and 90m resolution SRTM DEM data, with the help of two-pass DInSAR method in GAMMA software, and the differential interferograms and deformation maps were obtained accordingly. Besides, the influence of temperature, topography and other factors on deformation of frozen soil were also studied. The following conclusions were obtained: there is a negative correlation between deformation and temperature, and there is a delay between the deformation change and that of temperature; deformation and elevation are positively correlated; the permafrost deformation is also affected by solar radiation that could form variable amplitude variation.

scholarly journals Permafrost Deformation Monitoring Along the Qinghai-Tibet Plateau Engineering Corridor Using InSAR Observations with Multi-Sensor SAR Datasets from 1997–2018

Sensors ◽  
2019 ◽  
Vol 19 (23) ◽  
pp. 5306 ◽  
Author(s):  
Zhengjia Zhang ◽  
Mengmeng Wang ◽  
Zhijie Wu ◽  
Xiuguo Liu
Keyword(s):  
Human Activities ◽  
Ground Deformation ◽  
Deformation Monitoring ◽  
Tibet Plateau ◽  
Deformation Model ◽  
Permafrost Region ◽  
Infrastructure Development ◽  
Freezing And Thawing ◽  
Qinghai Tibet Plateau ◽  
Observation Period

As the highest elevation permafrost region in the world, the Qinghai-Tibet Plateau (QTP) permafrost is quickly degrading due to global warming, climate change and human activities. The Qinghai-Tibet Engineering Corridor (QTEC), located in the QTP tundra, is of growing interest due to the increased infrastructure development in the remote QTP area. The ground, including the embankment of permafrost engineering, is prone to instability, primarily due to the seasonal freezing and thawing cycles and increase in human activities. In this study, we used ERS-1 (1997–1999), ENVISAT (2004–2010) and Sentinel-1A (2015–2018) images to assess the ground deformation along QTEC using time-series InSAR. We present a piecewise deformation model including periodic deformation related to seasonal components and interannual linear subsidence trends was presented. Analysis of the ERS-1 result show ground deformation along QTEC ranged from −5 to +5 mm/year during the 1997–1999 observation period. For the ENVISAT and Sentinel-1A results, the estimated deformation rate ranged from −20 to +10 mm/year. Throughout the whole observation period, most of the QTEC appeared to be stable. Significant ground deformation was detected in three sections of the corridor in the Sentinel-1A results. An analysis of the distribution of the thaw slumping region in the Tuotuohe area reveals that ground deformation was associated with the development of thaw slumps in one of the three sections. This research indicates that the InSAR technique could be crucial for monitoring the ground deformation along QTEC.

scholarly journals Permafrost Soil Moisture Monitoring Using Multi-Temporal TerraSAR-X Data in Beiluhe of Northern Tibet, China

2018 ◽  
Vol 10 (10) ◽  
pp. 1577 ◽  
Author(s):  
Chao Wang ◽  
Zhengjia Zhang ◽  
Simonetta Paloscia ◽  
Hong Zhang ◽  
Fan Wu ◽  
...  
Keyword(s):  
Time Series ◽  
Soil Moisture ◽  
Winter Season ◽  
Tibet Plateau ◽  
Permafrost Soil ◽  
Permafrost Region ◽  
Backscattering Coefficient ◽  
Sar Images ◽  
Northern Tibet ◽  
Variation Patterns

Global change has significant impact on permafrost region in the Tibet Plateau. Soil moisture (SM) of permafrost is one of the most important factors influencing the energy flux, ecosystem, and hydrologic process. The objectives of this paper are to retrieve the permafrost SM using time-series SAR images, without the need of auxiliary survey data, and reveal its variation patterns. After analyzing the characteristics of time-series radar backscattering coefficients of different landcover types, a two-component SM retrieval model is proposed. For the alpine meadow area, a linear retrieving model is proposed using the TerraSAR-X time-series images based on the assumption that the lowest backscattering coefficient is measured when the soil moisture is at its wilting point and the highest backscattering coefficient represents the water-saturated soil state. For the alpine desert area, the surface roughness contribution is eliminated using the dual SAR images acquired in the winter season with different incidence angles when retrieving soil moisture from the radar signal. Before the model implementation, landcover types are classified based on their backscattering features. 22 TerraSAR-X images are used to derive the soil moisture in Beiluhe, Northern Tibet with different incidence angles. The results obtained from the proposed method have been validated using in-situ soil moisture measurements, thus obtaining RMSE and Bias of 0.062 cm3/cm3 and 4.7%, respectively. The retrieved time-series SM maps of the study area point out the spatial and temporal SM variation patterns of various landcover types.

Creep characteristics and process analyses of a thaw slump in the permafrost region of the Qinghai-Tibet Plateau, China

Geomorphology ◽  
2017 ◽  
Vol 293 ◽  
pp. 1-10 ◽  
Author(s):  
Zhe Sun ◽  
Yibo Wang ◽  
Yan Sun ◽  
Fujun Niu ◽  
GuoyuLi ◽  
...  
Keyword(s):  
Tibet Plateau ◽  
Permafrost Region ◽  
Creep Characteristics ◽  
Qinghai Tibet Plateau

Diversity and distribution of alkaliphilic psychrotolerant bacteria in the Qinghai–Tibet Plateau permafrost region

Extremophiles ◽  
2007 ◽  
Vol 11 (3) ◽  
pp. 415-424 ◽  
Author(s):  
Gaosen Zhang ◽  
Xiaojun Ma ◽  
Fujun Niu ◽  
Maoxing Dong ◽  
Huyuan Feng ◽  
...  
Keyword(s):  
Tibet Plateau ◽  
Permafrost Region ◽  
Psychrotolerant Bacteria ◽  
Qinghai Tibet Plateau
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