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Compared with slope surface measurement, subsurface monitoring has the potential to detect abnormal changes at an earlier stage. Due to the large-scale deformation of landslides and the complex geological environment, the existing subsurface devices generally have limited measuring range or high economic cost. Thus, it is urgent to develop an advanced method to improve the sustainable monitoring of large subsurface deformation. In this study, a novel flexible device is designed for slope subsurface monitoring, which combines an active waveguide of acoustic emission and the distinctive structure of a large-deformation bolt. An experimental system is built and a loading process of three-stage deformation is carried out to test the performance of the flexible device. The kinematic, mechanical and acoustic emission parameters are synchronously obtained in the whole landslide model test. The results indicate that different evolution stages of a landslide can be distinguished by sliding acceleration. The axial tension within the anchor cable changes consistently with sliding thrust. In addition, using acoustic emission to quantify slope deformation has achieved strong correlation. An extra experiment with constant velocity is conducted to explore the precision of deformation quantification by acoustic emission. A schematic diagram is presented for how this novel device would be used for landslide monitoring in the field, with the potential practicability of stabilizing the slope.
Lizheng Deng; Hongyong Yuan; Jianguo Chen; Ming Fu; Yang Chen; KaiYuan Li; Miaomiao Yu; Tao Chen. Experimental Investigation on Integrated Subsurface Monitoring of Soil Slope Using Acoustic Emission and Mechanical Measurement. Applied Sciences 2021, 11, 7173 .
AMA StyleLizheng Deng, Hongyong Yuan, Jianguo Chen, Ming Fu, Yang Chen, KaiYuan Li, Miaomiao Yu, Tao Chen. Experimental Investigation on Integrated Subsurface Monitoring of Soil Slope Using Acoustic Emission and Mechanical Measurement. Applied Sciences. 2021; 11 (16):7173.
Chicago/Turabian StyleLizheng Deng; Hongyong Yuan; Jianguo Chen; Ming Fu; Yang Chen; KaiYuan Li; Miaomiao Yu; Tao Chen. 2021. "Experimental Investigation on Integrated Subsurface Monitoring of Soil Slope Using Acoustic Emission and Mechanical Measurement." Applied Sciences 11, no. 16: 7173.
Acoustic emission (AE) monitoring has become an optional technology to quantify slope deformation. However, there are still challenges in developing generic AE interpretation strategies. Dynamics and kinematics models are two physical methods for analysing slope stability, which appear to improve the interpretability of AE monitoring data. The aim of this study is to explore the change patterns and interrelations of dynamics, kinematics, and AE measurements using a model test and physical analysis, to further understand the development process of a progressive landslide. A model test is designed based on the kinematics model of landslide three-stage deformation. An equation between factor of safety (FoS) and thrust is proposed based on the mechanical model of a landslide test. There is a clear correspondence between the displacement and inverse velocity during the deformation-controlled process. Relationships are uncovered between the thrust and FoS as well as the thrust and acceleration. As a characteristic parameter of AE, ring down count (RDC) is able to quantify the deformation process of the soil slope. Moreover, acceleration and RDC can reflect the sudden change of the slope state and, hence, can be effective indicators for the early warning in a progressive landslide.
Lizheng Deng; Hongyong Yuan; Jianguo Chen; Zhanhui Sun; Ming Fu; Fei Wang; Shuan Yan; KaiYuan Li; Miaomiao Yu; Tao Chen. Correlation between Acoustic Emission Behaviour and Dynamics Model during Three-Stage Deformation Process of Soil Landslide. Sensors 2021, 21, 2373 .
AMA StyleLizheng Deng, Hongyong Yuan, Jianguo Chen, Zhanhui Sun, Ming Fu, Fei Wang, Shuan Yan, KaiYuan Li, Miaomiao Yu, Tao Chen. Correlation between Acoustic Emission Behaviour and Dynamics Model during Three-Stage Deformation Process of Soil Landslide. Sensors. 2021; 21 (7):2373.
Chicago/Turabian StyleLizheng Deng; Hongyong Yuan; Jianguo Chen; Zhanhui Sun; Ming Fu; Fei Wang; Shuan Yan; KaiYuan Li; Miaomiao Yu; Tao Chen. 2021. "Correlation between Acoustic Emission Behaviour and Dynamics Model during Three-Stage Deformation Process of Soil Landslide." Sensors 21, no. 7: 2373.
Typhoon disaster represent one of the most prominent threats to public safety in the Macao Special Administrative Region (SAR) of China and can cause severe economic losses and casualties. Prior to the landing of typhoons, affected people should be evacuated to shelters as soon as possible; this is crucial to prevent injuries and deaths. Various models aim to solve this problem, but the characteristics of disasters and evacuees are often overlooked. This study proposes a model based on the influence of a typhoon and its impact on evacuees. The model’s objective is to minimize the total evacuation distance, taking into account the distance constraint. The model is solved using the spatial analysis tools of Geographic Information Systems (GIS). It is then applied in Macao to solve the evacuation process for Typhoon Mangkhut 2018. The result is an evacuee allocation plan that can help the government organize evacuation efficiently. Furthermore, the number of evacuees allocated to shelters is compared with shelter capacities, which can inform government shelter construction in the future.
Xiujuan Zhao; Peng Du; Jianguo Chen; Dapeng Yu; Wei Xu; Shiyan Lou; Hongyong Yuan; Kuai Peng Ip. A Typhoon Shelter Selection and Evacuee Allocation Model: A Case Study of Macao (SAR), China. Sustainability 2020, 12, 3308 .
AMA StyleXiujuan Zhao, Peng Du, Jianguo Chen, Dapeng Yu, Wei Xu, Shiyan Lou, Hongyong Yuan, Kuai Peng Ip. A Typhoon Shelter Selection and Evacuee Allocation Model: A Case Study of Macao (SAR), China. Sustainability. 2020; 12 (8):3308.
Chicago/Turabian StyleXiujuan Zhao; Peng Du; Jianguo Chen; Dapeng Yu; Wei Xu; Shiyan Lou; Hongyong Yuan; Kuai Peng Ip. 2020. "A Typhoon Shelter Selection and Evacuee Allocation Model: A Case Study of Macao (SAR), China." Sustainability 12, no. 8: 3308.
This paper is concerned with imaging techniques for mapping and locating underground pipeline leakage. Ground surface vibrations induced by the propagating axisymmetric wave can be measured by an array of acoustic/vibration sensors, with the extraction of magnitude information used to determine the position of leak source. A method of connected graph traversal is incorporated into the vibroacoustic technique to obtain the spatial image with better accuracy compared to the conventional magnitude contour plot. Measurements are made on a dedicated cast iron water pipe by an array of seven triaxial geophones. The spectral characteristics of the propagation of leak noise signals from underground water pipes to the ground surface are reported. Furthermore, it is demonstrated that suspicious leakage areas can be readily identified by extracting and fusing the feature patterns at low frequencies where leak noise dominates. The results agree well with the real leakage position in the underground pipeline.
Shuan Yan; Hongyong Yuan; Yan Gao; Boao Jin; Jennifer M. Muggleton; Lizheng Deng. On Image Fusion of Ground Surface Vibration for Mapping and Locating Underground Pipeline Leakage: An Experimental Investigation. Sensors 2020, 20, 1896 .
AMA StyleShuan Yan, Hongyong Yuan, Yan Gao, Boao Jin, Jennifer M. Muggleton, Lizheng Deng. On Image Fusion of Ground Surface Vibration for Mapping and Locating Underground Pipeline Leakage: An Experimental Investigation. Sensors. 2020; 20 (7):1896.
Chicago/Turabian StyleShuan Yan; Hongyong Yuan; Yan Gao; Boao Jin; Jennifer M. Muggleton; Lizheng Deng. 2020. "On Image Fusion of Ground Surface Vibration for Mapping and Locating Underground Pipeline Leakage: An Experimental Investigation." Sensors 20, no. 7: 1896.
Earthquakes are one type of natural disaster that causes serious economic loss, deaths, and homelessness, and providing shelters is vital to evacuees who have been affected by an earthquake. Constructing shelters with reasonable capacity in the right locations and allocating evacuees to them in a reasonable time period is one disaster management method. This study proposes a multi-objective hierarchical model with three stages, i.e., an immediate shelter (IS) stage, a short-term shelter (STS) stage, and a long-term shelter (LTS) stage. According to the requirements of evacuees of IS, STS, and LTS, the objective of both the IS and STS stages is to minimize total evacuation time and the objectives of the LTS are to minimize total evacuation time and to minimize total shelter area. A modified particle swarm optimization (MPSO) algorithm is used to solve the IS and STS stages and an interleaved modified particle swarm optimization algorithm and genetic algorithm (MPSO-GA) is applied to solve the LTS stage. Taking Chaoyang District, Beijing, China as a case study, the results generated using the model present the government with a set of options. Thus, according to the preferences of the government, the determination can be made regarding where to construct ISs, STSs, and LTSs, and how to allocate the evacuees to them.
Xiujuan Zhao; Jianguo Chen; Wei Xu; Shiyan Lou; Peng Du; Hongyong Yuan; Kuai Peng Ip. A Three-Stage Hierarchical Model for An Earthquake Shelter Location-Allocation Problem: Case Study of Chaoyang District, Beijing, China. Sustainability 2019, 11, 4561 .
AMA StyleXiujuan Zhao, Jianguo Chen, Wei Xu, Shiyan Lou, Peng Du, Hongyong Yuan, Kuai Peng Ip. A Three-Stage Hierarchical Model for An Earthquake Shelter Location-Allocation Problem: Case Study of Chaoyang District, Beijing, China. Sustainability. 2019; 11 (17):4561.
Chicago/Turabian StyleXiujuan Zhao; Jianguo Chen; Wei Xu; Shiyan Lou; Peng Du; Hongyong Yuan; Kuai Peng Ip. 2019. "A Three-Stage Hierarchical Model for An Earthquake Shelter Location-Allocation Problem: Case Study of Chaoyang District, Beijing, China." Sustainability 11, no. 17: 4561.
It has been demonstrated that climate change is an established fact. A good comprehension of climate and extreme weather variation characteristics on a temporal and a spatial scale is important for adaptation and response. In this work, the characteristics of temperature, precipitation, and extreme weather distribution and variation is summarized for a period of 60 years and the seasonal fluctuation of temperature and precipitation is also analyzed. The results illustrate the reduction in daily and annual temperature divergence on both temporal and spatial scales. However, the gaps remain relatively significant. Furthermore, the disparity in daily and annual precipitation are found to be increasing on both temporal and spatial scales. The findings indicate that climate change, to a certain extent, narrowed the temperature gap while widening the precipitation gap on temporal and spatial scales in China.
Chunli Zhao; Jianguo Chen; Peng Du; Hongyong Yuan. Characteristics of Climate Change and Extreme Weather from 1951 to 2011 in China. International Journal of Environmental Research and Public Health 2018, 15, 2540 .
AMA StyleChunli Zhao, Jianguo Chen, Peng Du, Hongyong Yuan. Characteristics of Climate Change and Extreme Weather from 1951 to 2011 in China. International Journal of Environmental Research and Public Health. 2018; 15 (11):2540.
Chicago/Turabian StyleChunli Zhao; Jianguo Chen; Peng Du; Hongyong Yuan. 2018. "Characteristics of Climate Change and Extreme Weather from 1951 to 2011 in China." International Journal of Environmental Research and Public Health 15, no. 11: 2540.
Chunli Zhao; Jianguo Chen; Zhanhui Sun; Peng Du; Hongyong Yuan. Design of risk monitoring and prediction system for resource security management. Proceedings of the 4th ACM SIGSPATIAL International Workshop on Safety and Resilience 2018, 6 .
AMA StyleChunli Zhao, Jianguo Chen, Zhanhui Sun, Peng Du, Hongyong Yuan. Design of risk monitoring and prediction system for resource security management. Proceedings of the 4th ACM SIGSPATIAL International Workshop on Safety and Resilience. 2018; ():6.
Chicago/Turabian StyleChunli Zhao; Jianguo Chen; Zhanhui Sun; Peng Du; Hongyong Yuan. 2018. "Design of risk monitoring and prediction system for resource security management." Proceedings of the 4th ACM SIGSPATIAL International Workshop on Safety and Resilience , no. : 6.
Jiajia Fu; Jianguo Chen; Hongyong Yuan. Numerical Study on the Thickness of the Window Spill Plume in External Fa?ade Fire. Proceedings of the 2018 7th International Conference on Energy, Environment and Sustainable Development (ICEESD 2018) 2018, 1 .
AMA StyleJiajia Fu, Jianguo Chen, Hongyong Yuan. Numerical Study on the Thickness of the Window Spill Plume in External Fa?ade Fire. Proceedings of the 2018 7th International Conference on Energy, Environment and Sustainable Development (ICEESD 2018). 2018; ():1.
Chicago/Turabian StyleJiajia Fu; Jianguo Chen; Hongyong Yuan. 2018. "Numerical Study on the Thickness of the Window Spill Plume in External Fa?ade Fire." Proceedings of the 2018 7th International Conference on Energy, Environment and Sustainable Development (ICEESD 2018) , no. : 1.
As one of the important research areas of public safety and sociology, the study of mass incidents is inseparable from the support of a large number of real cases data. However, there is a lack of available and reliable mass incidents databases in academic circles in China. Using the news retrieval approach, this paper builds a case database of mass incidents in China from 1998 to 2014 based on the GIS system. Then the spatial-temporal distribution rules of these mass incidents data are analyzed from the perspective of geography. Our research effectively integrates the temporal attributes, spatial attributes, organizational attributes and violence attributes of mass incidents. The results show the hot areas and temporal distribution of mass incidents and mass violence, and reveals the main triggers of these events.
Lida Huang; Jianguo Chen; Zewei Zhang; Hongyong Yuan; Qing Deng; Feng Sun. Case Database Construction and Temporal-spatial Analysis of Mass Incidents in China Based on GIS. EasyChair Preprints 2018, 1 .
AMA StyleLida Huang, Jianguo Chen, Zewei Zhang, Hongyong Yuan, Qing Deng, Feng Sun. Case Database Construction and Temporal-spatial Analysis of Mass Incidents in China Based on GIS. EasyChair Preprints. 2018; ():1.
Chicago/Turabian StyleLida Huang; Jianguo Chen; Zewei Zhang; Hongyong Yuan; Qing Deng; Feng Sun. 2018. "Case Database Construction and Temporal-spatial Analysis of Mass Incidents in China Based on GIS." EasyChair Preprints , no. : 1.