Article
Engineering, Civil
Yi Yu, Lutz Weihermueller, Anja Klotzsche, Lena Laerm, Harry Vereecken, Johan Alexander Huisman
Summary: This study compared the performance of sequential and coupled inversion workflows in obtaining soil hydraulic properties from horizontal borehole GPR data. The results showed that sequential inversion did not provide accurate estimates, while the coupled inversion approach provided accurate estimates of hydraulic properties in both synthetic modelling studies and actual field data. The study concluded that coupled inversion should be preferred over sequential inversion for horizontal borehole GPR data when strong SWC gradients occur during infiltration events.
JOURNAL OF HYDROLOGY
(2021)
Article
Environmental Sciences
Shichao Jia, Tingjun Zhang, Jiansheng Hao, Chaoyue Li, Roger Michaelides, Wanwan Shao, Sihao Wei, Kun Wang, Chengyan Fan
Summary: Active layer thickness (ALT) is a sensitive indicator of response to climate change and has important influences on various aspects of the regional environment. This study used ground-penetrating radar (GPR) surveys and a statistical model to investigate the spatial variability of ALT along the Qinghai-Tibet Engineering Corridor (QTEC) and its relationship with soil thermal regime, soil properties, and vegetation.
Article
Geochemistry & Geophysics
Amarsaikhan Tsogtbaatar, Takayuki Kawai, Motoyuki Sato
Summary: This study utilized ground-penetrating radar technology to analyze near-surface soil water content in different topographical locations in a semi-arid climate area in Central Asia. By accurately measuring the reflected electromagnetic wave velocity, the study successfully determined the near-surface soil water content, providing valuable information on soil hydrology and subsurface structures.
EXPLORATION GEOPHYSICS
(2022)
Article
Geography, Physical
Michael Klinge, Florian Schneider, Choimaa Dulamsuren, Kim Arndt, Uudus Bayarsaikhan, Daniela Sauer
Summary: The study analyzed the spatial distribution of forests and discontinuous permafrost in the forest-steppe of the northern Khangai Mountains in Mongolia, finding that factors such as topography, vegetation, and soil properties influence the presence and depth of permafrost. The presence of permafrost is crucial for vegetation growth, and the disappearance of permafrost due to climate warming will have impacts on the local ecosystem.
EARTH SURFACE PROCESSES AND LANDFORMS
(2021)
Article
Environmental Sciences
Shunshun Qi, Gouyu Li, Dun Chen, Mingtang Chai, Yu Zhou, Qingsong Du, Yapeng Cao, Liyun Tang, Hailiang Jia
Summary: This article investigates the damage properties of a damaged block-stone embankment and provides reference points for future construction and maintenance of such embankments.
Article
Geography, Physical
Emanuele Forte, Hugh M. French, Rossana Raffi, Ilaria Santin, Mauro Guglielmin
Summary: This study reports the findings of a combined geophysical and geomorphological investigation of thermal-contraction-crack polygons near Gondwana station in northern Victoria Land, Antarctica. The study area, characterized by random orthogonal polygons, was analyzed using ground penetrating radar, electrical resistivity tomography, geomorphological surveys, and trench excavations. The study found that the polygons are composite in nature and only well developed at higher elevations above the current sea level. Unexpectedly, the polygons align with the raised beach boundaries and correlate with stratigraphic layers dipping toward the sea.
PERMAFROST AND PERIGLACIAL PROCESSES
(2022)
Article
Environmental Sciences
Andrew D. Parsekian, Richard H. Chen, Roger J. Michaelides, Taylor D. Sullivan, Leah K. Clayton, Lingcao Huang, Yuhuan Zhao, Elizabeth Wig, Mahta Moghaddam, Howard Zebker, Kevin Schaefer
Summary: This study validates airborne SAR-derived ALT estimates in three regions of Alaska, USA using calibrated ground penetrating radar (GPR) geophysical data. The remotely sensed ALT estimates matched the field observations within uncertainty for 79% of locations, suggesting that SAR is an effective tool to monitor permafrost measurements.
Article
Geochemistry & Geophysics
Iraklis Giannakis, Antonios Giannopoulos, Craig Warren, Anastasia Sofroniou
Summary: Full-waveform inversion is a promising interpretation tool for hydrogeological applications, but has been limited in practical uptake due to computational requirements, inability to reconstruct loss mechanisms, and need for a good initial model. This study introduces a novel FWI approach that addresses these issues using a fractally correlated water distribution, reducing computational requirements and improving performance.
IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING
(2022)
Article
Environmental Sciences
Shunshun Qi, Guoyu Li, Dun Chen, Fujun Niu, Zhizhong Sun, Gang Wu, Qingsong Du, Mingtang Chai, Yapeng Cao, Jianwei Yue
Summary: In this study, a section (K2952-K2953) of the Qinghai-Tibet Highway (QTH) was selected to study the embankment damages and permafrost distribution. Ground-penetrating radar (GPR) images and multi-source data analysis were used to investigate the performance characteristics of the embankment, active layer, and permafrost table. The research findings revealed that the embankment construction in this section had a stabilizing effect on the permafrost table, but the continuity of permafrost distribution in the thermosyphon section was poor with localized degradation. The research results described in this article can provide a crucial foundation for detecting highway damage and permafrost under embankments in permafrost regions in the future.
Article
Construction & Building Technology
Chihping Kuo
Summary: The study proposes the use of ground penetrating radar method to investigate mud pumping distributions to prevent events and reduce labor and material costs.
CONSTRUCTION AND BUILDING MATERIALS
(2021)
Article
Geography, Physical
Seth William Campbell, Martin Briggs, Samuel G. Roy, Thomas A. Douglas, Stephanie Saari
Summary: This study examined the relationship between permafrost, surface biomass, and solar insolation near Twelvemile Lake in Alaska, demonstrating the impact of vegetation type and terrain on permafrost distribution. By developing an artificial neural network, researchers accurately predicted permafrost extent in the broader region with a 90.2% accuracy rate. The strong linear correlation between permafrost probability and seasonal thaw depth suggests the potential of using these models to explore thaw patterns and active layer thickness variability.
PERMAFROST AND PERIGLACIAL PROCESSES
(2021)
Article
Geochemistry & Geophysics
Samuel Wagner, Brian M. Worthmann, Anh-Vu Pham
Summary: This study investigates the impact of receiver timing jitter on the quality of imaging of ground-penetrating radar systems, showing the residue of coupling noise induced by jitter throughout the processing pipeline. It reveals that simple filtering is not sufficient to remove the residue and proposes linear slope and migrated probability specifications for assessing the severity of coupling signals in a given jitter environment.
IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING
(2021)
Article
Engineering, Electrical & Electronic
Jingxia Li, Ning Zhang, Hang Xu, Bingjie Wang, Li Liu, Mingrui Zhao
Summary: A polarimetric chaotic ground penetrating radar is proposed to improve the detection accuracy of underground pipes. The use of chaotic signal and multi-polarization detection mode enhances pipe responses and accurately determines their shape and distribution.
IEEE SENSORS JOURNAL
(2022)
Article
Geochemistry & Geophysics
Federico Lombardi, Hugh D. Griffiths, Maurizio Lualdi, Alessio Balleri
Summary: One of the main limitations of using ground-penetrating radar (GPR) for landmine detection is the interference from clutter, which raises the detection threshold of the system. Characterizing the internal structure of a target may provide key information for developing algorithms to differentiate between landmines and clutter. Through numerical assessment and experimental validation, it has been found that it is possible to identify and characterize the scattering components in the GPR signature of a landmine.
IEEE GEOSCIENCE AND REMOTE SENSING LETTERS
(2021)
Article
Environmental Sciences
Maria Garcia-Fernandez, Guillermo Alvarez-Narciandi, Yuri Alvarez Lopez, Fernando Las-Heras Andres
Summary: Ground Penetrating Radar (GPR) has proven to be a successful technique for detecting landmines and IEDs, with novel architectures improving safety and speed of detection. A hybrid GPR architecture combining advantages of Forward-Looking and Down-Looking GPR has been experimentally validated, aiming to reduce clutter and increase dynamic range in detection. Compact radar modules operating in the lower SHF frequency band were used for realistic target validation.
Article
Geography, Physical
Lingxiao Wang, Lin Zhao, Huayun Zhou, Shibo Liu, Guojie Hu, Zhibin Li, Chong Wang, Jianting Zhao
Summary: This study analyzed ground surface deformation and observed temperature and moisture data to investigate the thawing process of ice-rich permafrost. The results showed that long-term subsidence velocity is a reliable indicator of ground ice melting, and the melting of ice-poor permafrost does not result in significant subsidence. The study also found that geomorphological conditions affect the deformation velocity.
PERMAFROST AND PERIGLACIAL PROCESSES
(2023)
Article
Environmental Sciences
Shenning Wang, Ren Li, Tonghua Wu, Lin Zhao, Xiaodong Wu, Guojie Hu, Jimin Yao, Junjie Ma, Wenhao Liu, Yongliang Jiao, Yao Xiao, Shuhua Yang, Jianzong Shi, Yongping Qiao
Summary: In this study, the soil temperature and moisture of the active layers in the permafrost regions of the Qinghai-Tibet Plateau were simulated using the community land model version 5.0. The soil enthalpy was analyzed to estimate the soil energy state and understand the energy changes during freezing and thawing. The results showed that soil enthalpy had significant seasonal variations, accurately reflecting the freezing and thawing processes. The change in soil enthalpy was closely related to the thawing depth of the active layer and could be expressed as an exponential relationship.
Article
Environmental Sciences
Mengdi Jiao, Lin Zhao, Chong Wang, Guojie Hu, Yan Li, Jianting Zhao, Defu Zou, Zanpin Xing, Yongping Qiao, Guangyue Liu, Erji Du, Minxuan Xiao, Yingxu Hou
Summary: Soil temperature is crucial for the state and degradation of permafrost. The temperature at depths of 10 cm and 50 cm in the active layer affects surface water cycles, vegetation, and can be used for permafrost models. However, there are uncertainties in soil temperature data in the permafrost region of the Qinghai-Tibet Plateau due to observation limitations. This study evaluated and calibrated four soil temperature datasets, finding different uncertainties among the reanalysis data. GLDAS-Noah had the smallest bias. The corrected GLDAS-Noah data showed improved accuracy, and the warming rates at 10 cm and 50 cm depths were analyzed.
Article
Environmental Sciences
Yanzhong Li, Jiacheng Zhuang, Peng Bai, Wenjun Yu, Lin Zhao, Manjie Huang, Yincong Xing
Summary: Remotely sensed precipitation estimates (RSPEs) are crucial in monitoring drought in ungauged or sparsely gauged areas. This study evaluated the performance of three long-term RSPEs (PERSIANN, CHIRPS, and MSWEP) in capturing meteorological drought variations across China. Results showed that the RSPEs generally captured the spatial patterns and trends of in situ observational precipitation data. However, there were skill divergences in capturing the drought characteristics among the different basins. The findings underscore the importance of using multiple RSPEs for drought monitoring.
Review
Chemistry, Multidisciplinary
Rui Liu, Shuying Zang, Lin Zhao, Chunlei Wang, Boxiong Zhang, Xiaodong Wu
Summary: Discussing the development and shrinkage process of glaciers is important for understanding regional environmental evolution and predicting global changes. However, little is known about the developmental and retreat processes of mountain glaciers in the East Asian Monsoon region during the late Quaternary. This study utilized the latest glacial data from various regions impacted by the East Asian Monsoon to analyze the influence of monsoonal circulation patterns on the development of glaciers.
APPLIED SCIENCES-BASEL
(2023)
Article
Environmental Sciences
Zan -Pin Xing, Lin Zhao, Lei Fan, Guo-Jie Hu, De-Fu Zou, Chong Wang, Shu-Ci Liu, Er-Ji Du, Yao Xiao, Ren LI, Guang-Yue Liu, Yong-Ping Qiao, Jian-Zong Shi
Summary: Numerous studies have been conducted to evaluate and project permafrost changes based on CMIP datasets. However, the lack of verified data has led to over-projection of permafrost changes in CMIP3 and CMIP5. Moreover, future permafrost changes in CMIP6, especially on the Qinghai-Tibet Plateau, remain unknown. To address this, the study evaluated and calibrated monthly ground surface temperature (GST) based on in situ measurements, and found that the calibrated GST performed better than the CMIP6 models. The reconstructed GST data series could be used to simulate long-term permafrost temperature over the Qinghai-Tibet Plateau. Rating: 7/10
ADVANCES IN CLIMATE CHANGE RESEARCH
(2023)
Article
Agronomy
Junjie Ma, Ren Li, Hongchao Liu, Zhongwei Huang, Tonghua Wu, Xiaodong Wu, Lin Zhao, Guojie Hu, Yao Xiao, Yongliang Jiao, Wenhao Liu, Shenning Wang, Jianzong Shi, Yongping Qiao
Summary: Based on observations in the permafrost regions of Qinghai-Tibet Plateau, this study emphasizes the importance of soil property data for the accuracy of CLM5.0 model, and demonstrates the significant improvements in simulating surface energy fluxes and soil temperature by optimizing the thermal roughness length and dry surface layer schemes.
AGRICULTURAL AND FOREST METEOROLOGY
(2023)
Article
Agronomy
Cheng Yang, Tonghua Wu, Guojie Hu, Xiaofan Zhu, Jimin Yao, Ren Li, Lin Zhao, Yinghui Zhang
Summary: This study proposes two methods, the combination method (CM) and the sine method (SM), for estimating the daily average ground surface soil heat flux (G0_daily) over the Qinghai-Tibet Plateau (QTP). The CM estimates the instantaneous surface soil heat flux (G0_ins) at multiple times per day and then calculates G0_daily. The SM simulates G0_daily by estimating G0_ins during satellite transit based on diurnal variations in sinusoidal curves under clear-sky conditions. The CM shows better performance than the SM in terms of accuracy and applicability.
AGRICULTURAL AND FOREST METEOROLOGY
(2023)
Article
Biodiversity Conservation
Peiqing Lou, Tonghua Wu, Sizhong Yang, Xiaodong Wu, Jianjun Chen, Xiaofan Zhu, Jie Chen, Xingchen Lin, Ren Li, Chengpeng Shang, Dong Wang, Yune La, Amin Wen, Xin Ma
Summary: By analyzing a 30-year time series, it was found that vegetation on the Qinghai-Tibet Plateau has experienced rapid greening, mainly due to transitions from bareland to alpine grassland and from alpine grassland to alpine meadow. Precipitation and temperature were identified as the main factors influencing vegetation greening.
ECOLOGICAL INDICATORS
(2023)
Article
Biodiversity Conservation
Mei He, Qinlu Li, Leiyi Chen, Shuqi Qin, Yakov Kuzyakov, Yang Liu, Dianye Zhang, Xuehui Feng, Dan Kou, Tonghua Wu, Yuanhe Yang
Summary: Climate warming leads to widespread permafrost thaw, which releases carbon dioxide and triggers a positive permafrost carbon-climate feedback. The understanding of permafrost CO2 release through the priming effect is limited. By combining permafrost sampling and laboratory incubation on the Tibetan Plateau, this study detected a positive priming effect upon permafrost thaw and estimated the potential CO2 emission induced by the priming effect.
GLOBAL CHANGE BIOLOGY
(2023)
Review
Agronomy
Tianye Wang, Zening Wu, Ping Wang, Tonghua Wu, Yichi Zhang, Jun Yin, Jingjie Yu, Huiliang Wang, Xinjian Guan, Hongshi Xu, Dengming Yan, Denghua Yan
Summary: Global dryland areas are expanding due to climate change, leading to increased drought occurrences. The water stress in these areas is projected to further increase, posing a threat to dryland ecosystem sustainability. Despite limited research progress, the interactions between plants and groundwater are receiving increasing attention.
AGRICULTURAL AND FOREST METEOROLOGY
(2023)
Article
Geosciences, Multidisciplinary
Wensi Ma, Tonghua Wu, Xiaodong Wu, Sizhong Yang, Ren Li, Shiqiao Zhou, Xiangfei Li, Xiaofan Zhu, Junming Hao, Jie Ni, Dong Wang
Summary: This study investigated the carbon budgets of four ecosystems (alpine meadow, steppe, forest, and cropland) on the Tibetan Plateau from 2004 to 2017. The results showed that forest, cropland, and alpine meadow ecosystems acted as carbon sinks, while alpine steppe and overmature forest ecosystems served as carbon sources. The temperature sensitivity of carbon emissions was higher in the forest and alpine steppe ecosystems compared to the alpine meadow ecosystems. Multiple linear regression analysis revealed that water forcing was the main predictor for carbon fluxes in alpine steppe and alpine meadow ecosystems, while temperature forcing was the main predictor in forest and cropland ecosystems.
Article
Environmental Sciences
Lingxiao Wang, Lin Zhao, Huayun Zhou, Shibo Liu, Guangyue Liu, Defu Zou, Erji Du, Guojie Hu, Chong Wang
Summary: This study used remote sensing and SAR techniques to monitor terrain deformation in the source region of the Yangtze River, assess the release of ground ice meltwater, and evaluate water storage in the active layer. The results indicate widespread ground ice melting in the region, but the water release rate is relatively small. The findings provide a data basis for understanding the impact of permafrost thawing on the water cycle in the region.
WATER RESOURCES RESEARCH
(2023)
