A5060100107- Synthetic Aperture Radar (SAR) Applications and Techniques
- Cryospheric studies and observations
- Landslides and related hazards
- Groundwater and Watershed Analysis
- Environmental Changes in China
- Geophysical Methods and Applications
- Flood Risk Assessment and Management
- Remote Sensing and Land Use
- Remote Sensing in Agriculture
- Structural Health Monitoring Techniques
- Geophysics and Gravity Measurements
- Soil Carbon and Nitrogen Dynamics
- Geology and Paleoclimatology Research
- Automated Road and Building Extraction
- Geological and Geophysical Studies
- Remote Sensing and LiDAR Applications
- Water Quality Monitoring and Analysis
- Advanced SAR Imaging Techniques
- Optical Polarization and Ellipsometry
- Microbial Community Ecology and Physiology
- Marine and coastal ecosystems
- Advanced Image Fusion Techniques
- Color Science and Applications
- Soil Moisture and Remote Sensing
- Forest, Soil, and Plant Ecology in China
Capital Normal University
2015-2024
Fanjingshan National Nature Reserve
2024
People's Hospital of Cangzhou
2024
Beijing Haidian Hospital
2015
Long-term overexploitation of groundwater is the primary factor causing regional land subsidence in Beijing plain area, China. Currently, large funnels exist, one each southern and northern Beijing. We adopted multi-temporal interferometric synthetic aperture radar (MT-InSAR) method, incorporating both persistent scatterer (PS) small baseline (SB) approaches on 47 Envisat Advanced Synthetic Aperture Radar (ASAR) single look complex (SLC) images to map area. The temporal spatial variations...
Land subsidence is the disaster phenomenon of environmental geology with regionally surface altitude lowering caused by natural or man-made factors. Beijing, capital city China, has suffered from land since 1950s, and extreme groundwater extraction led to rates more than 100 mm/year. In this study, we employ two SAR datasets acquired Envisat TerraSAR-X satellites investigate deformation in Beijing Plain 2003 2013 based on multi-temporal InSAR technique. Furthermore, also use observation...
In the Beijing plain, long-term groundwater overexploitation, exploitation, and utilization of superficial urban space have led to land subsidence. this study, spatial–temporal analysis subsidence in was assessed by using small baseline subset (SBAS) interferometric synthetic aperture radar (InSAR) technique based on 47 TerraSAR-X SAR images from 2010 2015. Distinct variations were found study regions. The maximum annual rate 146 mm/year 2011 comparison between SBAS InSAR results ground...
Land subsidence is a global environmental geological hazard caused by natural or human activities. The high spatial resolution and continuous time coverage of interferometric synthetic aperture radar (InSAR) series analysis techniques provide data basis for the development methods investigation evolution mechanism study regional land subsidence. Beijing, capital city China, has suffered from decades since it was first recorded in 1950s. It reported that uneven ground fractures have seriously...
The long-term overexploitation of groundwater leads to serious land subsidence and threatens the safety Beijing-Tianjin-Hebei (BTH). In this paper, an interferometric point target analysis (IPTA) with small baseline subset InSAR (SBAS-InSAR) technique was used derive in a typical BTH area from 2012 2018 126 Radarsat-2 184 Sentinel-1 images. reveals that average rate reached 118 mm/year 2018. Eleven features were identified: Shangzhuang, Beijing Airport, Jinzhan Heizhuanghu Beijing, Guangyang...
Beijing-Tianjin High Speed Railway is the first high-speed railway in China. The Beijing section of it runs through areas affected by subsidence which threaten its safe operation. This study develops a new time series fusion method based on minimum gradient difference fitting curve to produce along this section. Through blending Envisat ASAR and TerrSAR-X series, InSAR-derived spatial–temporal development was analyzed railway. relationship between causes then explored using maximum entropy...
The South-to-North Water Diversion Project Middle Route (SNWD-MR) annually diverts hundreds of millions cubic meters water from the Danjiangkou Reservoir to Beijing, significantly impacting regional groundwater cycle. To conserve resources, government has implemented ecological replenishment (EWR) in some systems. This study aimed coupled process dynamics and land subsidence (LS) Yongding River (YDR) basin (Beijing section) following implementation SNWD-MR EWR. First, an Interferometric...
The availability of ZY-3 satellite data provides additional potential for surveying, mapping, and quantitative studies. Topographic correction, which eliminates the terrain effect caused by topographic relief, is one fundamental steps in preprocessing analysis vegetation. In this paper, we rectified using five commonly used correction models investigate their impact on regression estimation shrub forest leaf biomass obtained from sample plots study area. All corrections were assessed means...
The underground railway network of Beijing City, China, which is an important urban infrastructure, has burgeoned with the expansion city. However, influence subway construction and operation on local subsidence received minimal attention. By analyzing Radarsat-2 synthetic aperture radar satellite data, using persistent scatterer interferometry, we revealed land characteristics along Subway Line 6. In context subsidence, expectation (Ex) reflects overall level while entropy (En) degree...
Since the 1970s, land subsidence has been rapidly developing on Beijing Plain, and systematic study of evolutionary mechanism this is great significance in sustainable development regional economy. On basis Interferometric Synthetic Aperture Radar (InSAR) results, employed Mann–Kendall method for first time to determine mutation information Plain from 2004 2015. By combining hydrogeological conditions, “southern water” project, other data, we attempted analyse reasons mutations. First,...
Abstract A novel approach was developed to quantitatively examine land subsidence. It combines a new geophysical (NG) prospecting and the interferometric synthetic aperture radar (InSAR) technology explore uneven development of subsidence in Beijing, China. We derived spatial information over 4 years (from November 2014 July 2018) based on Sentinel‐1 satellite imagery small‐baseline InSAR (SBAS‐InSAR) method. Also, profile data were acquired using seismic frequency resonance (SFR) few...
Land subsidence has been occurring in Beijing since the 1970s. Five major land areas have formed: Dongbalizhuang–Dajiaoting, Laiguangying, Changping Shahe–Ba Xianzhuang, Daxing Yufa–Lixian, and Shunyi–Ping Gezhuang. In this paper, we studied on Dongbalizhuang–Dajiaoting Laiguangying using small baseline subset interferometry interferometric point target methods of 47 ENVISAT ASAR 29 RADARSAT-2 data. The results showed that degree these varied significantly. mean rate ranged from 143.43 to...
Groundwater resources have been exploited and utilized on a large scale in the North China Plain (NCP) since 1970s. As result of extensive groundwater depletion, NCP has experienced significant land subsidence, which threatens geological stability infrastructure health exacerbates risks other geohazards. In this study, we employed multi-track Synthetic Aperture Radar (SAR) datasets acquired by Sentinel-1A (S1A) satellite to detect spatial temporal distributions surface deformation from 2016...
Land subsidence threatens the stable operation of urban rail transit, including subways. Obtaining deformation information during entire life-cycle a subway becomes necessary means to guarantee safety. Restricted by sensor life and cost, single-sensor Multi-temporal Interferometric Synthetic Aperture Radar (MTI) technology has been unable meet needs long-term sequence, high-resolution monitoring, especially linear objects. The multi-sensor MTI time-series fusion (MMTI-TSF) techniques...
The uneven distribution of solar radiation due to topographic relief can significantly change the correlation between reflectance and other features such as biomass in rugged terrain regions. In this article, we use transfer theory improve Minnaert approach. After comparing correction methods for Landsat 8 Operational Land Imager (OLI) EO-1 Advanced (ALI) imagery acquired from mountainous region Beijing, China, used visual inspection, statistical analysis, analysis evaluate algorithms...
High-speed railways have strict standards of infrastructure deformation and post-construction settlement. The interferometric synthetic aperture radar (InSAR) has the ability to detect ground with a high accuracy wide coverage is becoming useful tool for monitoring railway health. In this study, we analyzed Beijing–Tianjin Intercity Railway (BTIR) track using InSAR time-series analysis different data sets. First, by RADARSAT-2 images, examined areas along BTIR significant subsidence. Then,...
Permafrost is widely degraded in the context of global warming. The spatial distribution soil microbes these cold habitats has received a lot attention. However, knowledge on changes permafrost microbial communities following thaw still limited. We used from taiga forest for indoor experiments using pristine as control (CK, −2 °C), simulating warming 15 days at temperatures 0 °C (T1), 2 (T2), and 4 (T3). Amplicons hypervariable V4 region bacterial 16S rRNA gene were sequenced to identify...
The soil contains abundant and diverse microorganisms, which interrelate closely with the aboveground vegetation impact structure function of forest ecosystem. To explore effect diversity on microbial functional in taiga forests, we selected significantly different important values Larix gmelinii as experimental grouping treatments based plant investigation from fixed plots Da Xing’anling Mountains. Following that, collected samples applied Biolog-ECO microplate method to investigate...