A5100335369- Climate change and permafrost
- Cryospheric studies and observations
- Remote Sensing and Land Use
- Meteorological Phenomena and Simulations
- Synthetic Aperture Radar (SAR) Applications and Techniques
- Arctic and Antarctic ice dynamics
- Landslides and related hazards
- Soil Moisture and Remote Sensing
- Scientific Computing and Data Management
- earthquake and tectonic studies
- Geology and Paleoclimatology Research
- Methane Hydrates and Related Phenomena
- Civil and Geotechnical Engineering Research
- Remote Sensing in Agriculture
- Thermodynamic and Structural Properties of Metals and Alloys
- Computational Fluid Dynamics and Aerodynamics
- Atmospheric and Environmental Gas Dynamics
- High Temperature Alloys and Creep
- Tropical and Extratropical Cyclones Research
- Aerodynamics and Fluid Dynamics Research
- Hydrocarbon exploration and reservoir analysis
- Remote Sensing and LiDAR Applications
- Smart Materials for Construction
- Climate variability and models
- Icing and De-icing Technologies
North China University of Technology
2024
Chinese Academy of Sciences
2009-2023
University of Chinese Academy of Sciences
2022-2023
Aerospace Information Research Institute
2020-2023
Beijing Institute of Big Data Research
2022-2023
China Meteorological Administration
2022
East China University of Technology
2021
China Earthquake Administration
2020
Hebei University of Architecture
2020
Institute of Remote Sensing and Digital Earth
2015-2019
Permafrost is widely distributed in the Tibetan Plateau. Seasonal freeze–thaw cycles of permafrost result upward and downward surface displacement. Multitemporal interferometric synthetic aperture radar (MT-InSAR) observations provide an effective method for monitoring displacement under difficult terrain climatic conditions. In this study, a seasonal sinusoidal model-based new small baselines subset (NSBAS) chain was adopted to obtain deformation time series. An experimental study carried...
Increasing near-surface temperature over the Qinghai-Tibet Plateau (QTP) has led to permafrost degradation and increasing active layer thickness (ALT). In this study, ALT was estimated based on ground subsidence monitored by multitemporal interferometric synthetic aperture radar (MT-InSAR) temporal-spatial multilayer soil moisture data. For monitoring, a modified Stefan piecewise elevation change model air data integrated into new small baseline subset (NSBAS) chain. A total of 33 scenes...
With global warming, permafrost is undergoing degradation, which may cause thawing subsidence, collapse, and emission of greenhouse gases preserved in previously frozen permafrost, change the local hydrology ecology system, threaten infrastructure indigenous communities. The Qinghai-Tibet Plateau (QTP) world’s largest region middle low latitudes. Permafrost status monitoring QTP great significance to economic development. In this study, we used 66 scenes ALOS data (2007–2009), 73 ALOS-2...
We make use of a novel X-ray radiography method to measure chemical diffusion in capillaries binary Al-Ni melts. Data are compared self coefficients Ni obtained by quasielastic neutron scattering as well and thermodynamic data molecular dynamic simulations. Interdiffusion is enhanced with maximum at Al40Ni60. show that this enhancement caused forces described the Darken-Manning equation. In liquid alloys Manning factor smaller than one can be attributed collective cross correlations.
This paper presents an experimental study of the cooling effect crushed rock-based embankment on slope wetlands along Chaidaer-Muli Railway. The result shows that only shady side can be effectively cooled down in a warm permafrost region and cool entire cold region. cannot eliminate problems from south-north slope. Slope wetland influence temperature field embankment. On uphill side, it will lead to degradation some cases development other cases, which depends topsoil water content ground...
摘要: 全球变暖可能导致多年冻土中的有机碳分解,向大气释放甲烷(CH4),但多年冻土的甲烷释放通量与微生物群落结构以及功能基因的丰度相关性还不清楚.于2019年6月~2020年1月,选择青藏高原北部祁连山多年冻土区,利用静态箱-气相色谱法对不同海拔地区进行CH4释放通量测定,并分析土壤理化性质、CH4功能微生物群落、功能微生物的基因丰度.结果发现,整体上,甲烷通量随着海拔的上升而增加,在4 100 m和3 900 m处表现为源,而其他各海拔地区表现为碳汇.土壤含水率、电导率和mcrA基因丰度与CH4通量正相关.研究表明祁连山多年冻土区不同海拔CH4通量受土壤含水率和mcrA基因丰度的影响,而有机碳含量会影响微生物的多样性. 关键词: 多年冻土 / 甲烷通量 功能基因 微生物 环境地质
In this study, based on the background of massive freezing engineering in coastal strata, thermal physical parameters and some laws soil were obtained through tests frozen frost heaving tests. When temperatures −5°C, −10°C, −15°C, −20°C, rates 0.53%, 0.95%, 1.28%, 1.41%, forces 0.37 MPa, 0.46 0.59 0.74 respectively. range test conditions, rate force increased with decrease temperature, relationship was roughly linear temperature. The entire cooling process could be divided into three stages:...
Generally speaking the permafrost in Tibet region is influenced by global climate change. The synthetic aperture radar interferometry (InSAR) could detect surface uplift/subsidence millimeter-level resolutions, which powerful for monitoring. In recent years, high-resolution (SAR) with centimeter-level resolution makes it possible to explore change not only regional scales but also local scales. this paper, TerraSAR-X Staring Spotlight (ST) mode data Beiluhe of Qinghai-Tibet Plateau (QTP)...
Garden landscape is the combination of nature and humanity, with high aesthetic value, ecological value cultural has become an important part people’s life. Modern people have a higher pursuit for spiritual food such as garden after material life satisfied, which brings new challenges to construction urban landscape. As advanced type machine learning, deep learning applied image recognition can solve problem low quality efficiency manual recognition. Based on this, this paper proposes...
摘要: 全球变暖会导致多年冻土解冻融化,这不仅对多年冻土区的工程和基础设施产生重要影响,还会改变陆地和大气间能量、水分和碳循环而反馈于气候系统.多年冻土主要分布于地下,其实际分布资料很难获取,因而许多研究对多年冻土区及其实际面积描述不清,进而影响了多年冻土变化和碳循环等研究结果.近年来,随着遥感和模型的发展,多年冻土实际分布取得了一系列的进展.根据国内外的最新结果,对全球和我国多年冻土区及其实际面积进行了综合分析.结果表明,目前北半球多年冻土区面积约为2 100万km2,多年冻土实际面积约为1 400万km2.我国青藏高原多年冻土区面积约为150万km2,实际多年冻土约为105万km2,我国其他地区的多年冻土实际分布还需进一步的研究. 关键词: 多年冻土 / 多年冻土区 气候变化 青藏高原 北极 环境地质
Abstract The settlement deformation of high-rise buildings is related to many factors, which are mainly about floor load and time. Based on the measured data building in 16 periods, this paper, number floors accumulated time selected as independent variables, used dependent variable. previous 11 periods modeling sequence establish a multiple linear regression model predict last 5 periods. results show that if there no fluctuation original sequence, fitting prediction good meet actual...
In order to investigate the influence of size sealing groove on hydraulic strength basin insulator, water pressure simulation model insulator considering ring was established and tested. The uniaxial tests, biaxial tests shear were carried out rubber material ring, parameters Mooney-Rivilin model, Neo-Hookean Yeoh Ogden fitted experimental data, which showed that had a good fitting result. whole process divided into assembling simulation, solved initial interference problem. width studied by...
Qinghai-Tibet Plateau (QTP) experienced seasonal freeze-thaw cycles. In this study a modified Stefan piecewise elevation changes model based on air temperature data was integrated to new small baselines subset (NSBAS) chain. A total of 33 scenes Sentinel-1 (S-1) with one year time range were collected build the Multitemporal interferometric synthetic aperture radar (MT-InSAR) analyzing network. The results revealed that estimated surface subsidence ranged from -60 0 mm and linear value about...
With the global warming, thaw slump activity has increased in permafrost regions of Qinghai-Tibet Plateau (QTP), which influence stability human infrastructure and carbon cycling. However, intrinsic dynamic process surface displacement retrogression (RTS) is still less understood. Here, we employed spaceborne interferometric synthetic aperture radar (InSAR) based on L-band ALOS-2 PLASAR2 data acquired from December 2015 to May 2022 monitor subsidence trends slump-derived thermokarst terrain...
As a global warning, the Qinghai-Tibet Plateau (QTP) permafrost is undergoing degradation, which can be threat to high-altitude infrastructure. Multitemporal interferometric synthetic aperture radar (MT-InSAR) an effective tool monitor freeze-thaw deformation cycles of permafrost. In this study, we employ small baseline interferometry (SBAS) in northern Railway (QTR), including Tuotuohe, Beiluhe, Wudaoliang and Xidatan regions with 73 scenes L-band ALOS-2 stripmap SAR images between 2015...