scholarly journals Application of UAV and GB-SAR in Mechanism Research and Monitoring of Zhonghaicun Landslide in Southwest China

2021 ◽  
Vol 13 (9) ◽  
pp. 1653
Author(s):  
Bo Liu ◽  
Kun He ◽  
Mei Han ◽  
Xiewen Hu ◽  
Guotao Ma ◽  
...  
Keyword(s):  
Warning System ◽  
Field Investigation ◽  
In Situ Monitoring ◽  
Progressive Movement ◽  
Emergency Rescue ◽  
Causative Factors ◽  
Mechanism Research ◽  
Aerial Vehicle ◽  
Entrainment Effect

This paper presents a recent rainfall-induced landslide in China that occurred on August 21, 2020 and resulted in nine deaths. The sliding material traveled a distance of 800 m, with an altitude difference of about 180 m. A field investigation, remote sensing based on an unmanned aerial vehicle (UAV), in situ monitoring, and a rainfall data analysis were carried out to reveal the deposit characteristics, causative factors, post-landslide behavior, and the mechanism of the landslide. A saltatory micro-relief of the original slope determined the multiple-stage failure type of the slide, and also promoted the entrainment effect during the landslide movement. After the first-initiation sliding stage, the motion of this landslide involved typical progressive movement, and over time, the style of the runout generally turned into a flow-like form. Furthermore, the antecedent cumulative rainfall of 149.5 mm directly contributed to the occurrence of the landslide. Using the GB-SAR early warning system, the post-landslide residual failure was successfully predicted 10 min in advance. The combination of the UAV and GB-SAR technique can surely be beneficial for other inaccessible landslide investigations as well and improves the emergency rescue security.

scholarly journals Vertical and Horizontal Profiles of Particulate Matter and Black Carbon Near Elevated Highways Based on Unmanned Aerial Vehicle Monitoring

2020 ◽  
Vol 12 (3) ◽  
pp. 1204 ◽  
Author(s):  
Rong Cao ◽  
Bai Li ◽  
Hong-Wei Wang ◽  
Shikang Tao ◽  
Zhong-Ren Peng ◽  
...  
Keyword(s):  
Black Carbon ◽  
Dispersion Model ◽  
Three Dimensional ◽  
Ground Level ◽  
In Situ Monitoring ◽  
Pollution Dispersion ◽  
Vehicle Monitoring ◽  
Aerial Vehicle ◽  
Monitoring Technologies

Highways passing through cities cause additional pollution inside the city. However, most of the current studies are using ground-based monitoring technologies, which make it difficult to capture the dispersion patterns of pollutants near elevated highways or transportation interchanges. The purpose of this study is to discover short-term three-dimensional variations in traffic-related pollutants based on unmanned aerial vehicles. The monitoring locations are at suburban elevated highway and transportation interchanges. The monitoring parameters include the particle number concentration (PN), particle mass concentration (PM), and black carbon (BC). The vertical profiles showed that most air pollutants increased significantly with the height of the elevated highways. Compared with the ground level, PNs increased by 54%–248% and BC increased by 201%. The decline rate of particle concentrations decreased with the increase of height and remained stable after 120 m. Furthermore, the R2 heatmap for regressions between each altitude showed that the linear relationship between 0–120 m was higher than that of other altitudes. In horizontal profiles, PNs spread to 100 m and then began to decline, BC began to decay rapidly after 50 m, but PMs varied less. After crossing another highway, PNs increased by 69–289%, PMs by 7–28%, and BC by 101%. Furthermore, the formation of new particles was observed at both locations as PN3 increased with distance within 100 m from the highway. This paper fills in the void of three-dimensional in situ monitoring near elevated highways, and can help develop and refine a three-dimensional traffic-related air pollution dispersion model and assess the impacts of transportation facilities on the urban environment.

scholarly journals In situ measurements of the ice flow motion at Eqip Sermia Glacier using a remotely controlled unmanned aerial vehicle (UAV)

2020 ◽  
Vol 9 (1) ◽  
pp. 1-10
Author(s):  
Guillaume Jouvet ◽  
Eef van Dongen ◽  
Martin P. Lüthi ◽  
Andreas Vieli
Keyword(s):  
Remote Sensing ◽  
Unmanned Aerial Vehicle ◽  
In Situ Measurements ◽  
In Situ Monitoring ◽  
High Temporal Resolution ◽  
Ice Flow ◽  
Flow Motion ◽  
Aerial Vehicle ◽  
Matching Techniques

Abstract. Measuring the ice flow motion accurately is essential to better understand the time evolution of glaciers and ice sheets and therefore to better anticipate the future consequence of climate change in terms of sea level rise. Although there are a variety of remote sensing methods to fill this task, in situ measurements are always needed for validation or to capture high-temporal-resolution movements. Yet glaciers are in general hostile environments where the installation of instruments might be tedious and risky when not impossible. Here we report the first-ever in situ measurements of ice flow motion using a remotely controlled unmanned aerial vehicle (UAV). We used a quadcopter UAV to land on a highly crevassed area of Eqip Sermia Glacier, West Greenland, to measure the displacement of the glacial surface with the aid of an onboard differential GNSS receiver. We measured approximately 70 cm of displacement over 4.36 h without setting foot onto the glacier – a result validated by applying UAV photogrammetry and template matching techniques. Our study demonstrates that UAVs are promising instruments for in situ monitoring and have great potential for capturing continuous ice flow variations in inaccessible glaciers – a task that remote sensing techniques can hardly achieve.

scholarly journals Development of an electrochemical sensor for in-situ monitoring of reactive species produced by cold physical plasma

2021 ◽  
Vol 326 ◽  
pp. 129007
Author(s):  
Zahra Nasri ◽  
Giuliana Bruno ◽  
Sander Bekeschus ◽  
Klaus-Dieter Weltmann ◽  
Thomas von Woedtke ◽  
...  
Keyword(s):  
Electrochemical Sensor ◽  
Reactive Species ◽  
In Situ Monitoring ◽  
Physical Plasma

In Situ Monitoring of Polaron Localization and Cell Activity with Charge Accumulation Spectroscopy

2021 ◽  
pp. 2105799
Author(s):  
Yu Zhang ◽  
Li Yang ◽  
Jintao Wang ◽  
Wangying Xu ◽  
Qiming Zeng ◽  
...  
Keyword(s):  
Cell Activity ◽  
In Situ Monitoring ◽  
Charge Accumulation
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