scholarly journals LARGE-SCALE SUBSIDENCE GEOHAZARD MONITORING WITH SENTINEL-1 SAR INTERFEROMETRY IN CENTRAL LISHUI (CHINA)

2021 ◽  
Vol XLIII-B3-2021 ◽  
pp. 873-878
Author(s):  
T. Qu ◽  
Z. Su ◽  
H. Yang ◽  
X. Shi ◽  
W. Shao
Keyword(s):  
Large Scale ◽  
Small Deformation ◽  
Sar Interferometry ◽  
Ground Subsidence ◽  
Impact Factors ◽  
Survey Techniques ◽  
Ground Survey ◽  
In Situ Sensors ◽  
Sbas Insar ◽  
Subsidence Monitoring

Abstract. Ground subsidence has become a serious problem along with the rapid urban expansions. Compared with traditional point-based ground survey techniques (GPS, levelling measurement and in-situ sensors), SAR Interferometry are quite appreciated for large-scale subsidence monitoring with long term and high accuracy. In this study, we focused on large-scale subsidence geohazard monitoring of central Lishui (China) and extracted subsidence velocity map of Liandu District. 57 Sentinle-1 SAR images from April 2019 to September 2020 are analysed with SBAS-InSAR technique. The overall subsidence of Liandu is significantly correlated with the distributions of construction engineering sites with displacement velocity of approximately 30–60 mm/yr. Various types of urban ground subsidence could be identified, including the overall settlement of large construction site, the slope deformation of construction excavation, significant settlement of refuse landfill and mountain crossing tunnel, and small deformation of highvoltage towers in mountainous areas. Our results indicated that the rapid urban developments are the dominant impact factors of subsidence in Lishui, China.

Ground Subsidence Monitoring in Hong Kong with Satellite SAR Interferometry

2004 ◽  
Vol 70 (10) ◽  
pp. 1151-1156 ◽  
Author(s):  
X.L. Ding ◽  
G.X. Liu ◽  
Z.W. Li ◽  
Z.L. Li ◽  
Y.Q. Chen
Keyword(s):  
Hong Kong ◽  
Sar Interferometry ◽  
Ground Subsidence ◽  
Subsidence Monitoring

scholarly journals LAND SUBSIDENCE MONITORING IN DEZHOU CITY BASED ON SBAS-INSAR TECHNOLOGY

2020 ◽  
Vol XLIII-B3-2020 ◽  
pp. 299-304
Author(s):  
G. Huang ◽  
H. Fan ◽  
L. Lu ◽  
W. Yu
Keyword(s):  
Urban Area ◽  
Land Subsidence ◽  
Large Scale ◽  
Vertical Direction ◽  
Ground Subsidence ◽  
Large Area ◽  
Coverage Area ◽  
Radar Images ◽  
Seasonal Characteristics ◽  
Sbas Insar

Abstract. To monitor the large area land subsidence in Dezhou city, Shandong province, China. This paper uses 23 scenes of Sentinel-1A radar images from August 2017 to February 2019, and based on small baseline subset (SBAS) technology to obtain the subsidence information in Dezhou urban area. The monitoring results show that: Dezhou city has a serious subsidence phenomenon in large coverage area. A subsidence funnel with Chenzhuang as the center was formed. The average annual subsidence rate (along the vertical direction) of the subsidence center exceeded 45 mm/yr. There was also a serious subsidence phenomenon in the eastern and northeastern parts of the urban area, and there was a tendency of forming a whole area. After detailed data analysis, it is found that the ground subsidence presents seasonal characteristics closely related to the groundwater level and is affected by large-scale engineering construction on the surface.

scholarly journals Application Terrasar-X data for studying land subsidence in Hanoi City

2019 ◽  
Vol 41 (4) ◽  
pp. 339-357
Author(s):  
Nguyen Duc Anh ◽  
Tran Quoc Cuong ◽  
Tran Van Anh ◽  
Hoang Anh The ◽  
Nguyen Trung Thanh ◽  
...  
Keyword(s):  
Spatial Scale ◽  
Land Subsidence ◽  
Central Area ◽  
High Accuracy ◽  
Sar Interferometry ◽  
Ground Subsidence ◽  
Data Set ◽  
Large Spatial Scale ◽  
X Band ◽  
Subsidence Monitoring

SAR Interferometry (InSAR) is a technique to measure land subsidence and can build a subsidence map on a large spatial scale with high accuracy. The study presented the application of PSInSAR for determining the subsidence of the central area of Hanoi through Terrasar-X data set from 2010 to 2015, with 23 images. The result shows that some area has the high subsidence in the districts of Hanoi such as Hoang Mai, Ha Dong and the slow subsidence such as Dong Da, Hai Ba Trung with subsidence velocity is less than -10mm/year. Besides, the correlation between ground subsidence measured by PSInSAR and subsidence monitoring of building CC02 Van Quan in Ha Dong district for the same period was computed with a correlation coefficient (R2) of 0.94. The PSInSAR technique can detect and estimate subsidence phenomena effectively with X-band.1.

SBAS-InSAR time series ground subsidence monitoring along Metro Line 13 in Qingdao, China

2021 ◽  
Vol 14 (23) ◽  
Author(s):  
Qiuxiang Tao ◽  
Zaijie Guo ◽  
Fengyun Wang ◽  
Qingguo An ◽  
Yu Han
Keyword(s):  
Time Series ◽  
Ground Subsidence ◽  
Sbas Insar ◽  
Subsidence Monitoring

scholarly journals Ground subsidence monitoring with SAR interferometry techniques in the rural area of Al Wagan, UAE

2018 ◽  
Vol 216 ◽  
pp. 276-288 ◽  
Author(s):  
Nikolaos Liosis ◽  
Prashanth Reddy Marpu ◽  
Kosmas Pavlopoulos ◽  
Taha B.M.J. Ouarda
Keyword(s):  
Rural Area ◽  
Sar Interferometry ◽  
Ground Subsidence ◽  
Subsidence Monitoring

Analysis of Ground Fissures Induced by Underground Mining in a Metal Mine

2011 ◽  
Vol 255-260 ◽  
pp. 3754-3758 ◽  
Author(s):  
Hai Jun Zhao ◽  
Feng Shan Ma ◽  
Jie Guo
Keyword(s):  
Large Scale ◽  
Underground Mining ◽  
Ground Subsidence ◽  
Formation Mechanisms ◽  
Ground Fissures ◽  
Subsidence Basin ◽  
Metal Mine ◽  
Distribution Features ◽  
Subsidence Monitoring ◽  
Cut And Fill

Jinchuan nickel mine is the largest cut-and fill mining mine in China. After keep successive mining for nearly twenty years, it appeared serious ground fissures. A major thrust of this paper is to discuss the distribution features, deformation regularities, development tendency and formation mechanisms of ground fissures based on long-term subsidence monitoring and investigation. The results showed that large-scale ground subsidence basin has been developed in the mine area, and the ground fissures mainly scattered in the tensile zone of the subsidence basin. Besides, ground fissures have the features of compressive shear or tensile mechanical properties and zonary pattern. Unfortunately, with the mining scale keep expanding, both the quantity and width of the ground fissures increased rapidly. This will be unfavourable to safety of mining and engineering facilities. Therefore, strengthened monitoring and prevention works are essentially important to the similar mines which designed with cut-and-fill mining method.

scholarly journals Measuring ground subsidence in Hanoi city by radar interferometry

2016 ◽  
Vol 19 (2) ◽  
pp. 122-129 ◽  
Author(s):  
Dinh Tong Dinh Ho ◽  
Cuong Quoc Tran ◽  
Anh Duc Nguyen ◽  
Thuy Le-Toan
Keyword(s):  
Large Scale ◽  
Sar Interferometry ◽  
Ground Subsidence ◽  
Silt Loam ◽  
Groundwater Extraction ◽  
Remote Sensing Technique ◽  
Multi Temporal ◽  
The City ◽  
Temporal Coverage ◽  
Good Agreement

The rapidly developing urbanization since the last decade of the 20th century leads to the strong groundwater extraction, resulting in the subsidence phenomena in the Hanoi, Vietnam. Recent advances in the multi-temporal spaceborne SAR interferometry, especially with Persistent Scatters Interferometry (PSI) approach, is the robust remote sensing technique for measuring ground subsidence in large scale with millimetric accuracy. This work has presented an advanced PSI analysis, to provide unprecedented spatial extent and continuous temporal coverage of the subsidence in Hanoi City. The correlation between the reference leveling velocity and the estimated PSI result is R2 = 0.86, and the root mean square error is 4.0 (mm/year), confirming their good agreement. The study shows that subsidence is most severe in the Haihung silt loam areas in the south of the city. The groundwater extraction resulting from urbanization and urban growth is mainly responsible for the subsidence.

AGRICULTURAL PRODUCTION OF CA DONG PEOPLE IN RESETTLEMENT AREA OF TRANH RIVER HYDROPOWER NUMBER 2: CURRENT SITUATION AND IMPACT FACTORS

2020 ◽  
Vol 9 (2) ◽  
Author(s):  
Bùi Thị Bích Lan
Keyword(s):  
Social Relations ◽  
Agricultural Production ◽  
Large Scale ◽  
Transition Process ◽  
Impact Factors ◽  
Small Scale ◽  
Scale Production ◽  
Technical Application ◽  
Production Models ◽  
Role Of The State

In Vietnam, the construction of hydropower projects has contributed significantly in the cause of industrialization and modernization of the country. The place where hydropower projects are built is mostly inhabited by ethnic minorities - communities that rely primarily on land, a very important source of livelihood security. In the context of the lack of common productive land in resettlement areas, the orientation for agricultural production is to promote indigenous knowledge combined with increasing scientific and technical application; shifting from small-scale production practices to large-scale commodity production. However, the research results of this article show that many obstacles in the transition process are being posed such as limitations on natural resources, traditional production thinking or the suitability and effectiveness of scientific - technical application models. When agricultural production does not ensure food security, a number of implications for people’s lives are increasingly evident, such as poverty, preserving cultural identity, social relations and resource protection. Since then, it has set the role of the State in researching and building appropriate agricultural production models to exploit local strengths and ensure sustainability.

scholarly journals Subsidence Monitoring of Fill Area in Yan’an New District Based on Sentinel-1A Time Series Imagery

2021 ◽  
Vol 13 (15) ◽  
pp. 3044
Author(s):  
Mingjie Liao ◽  
Rui Zhang ◽  
Jichao Lv ◽  
Bin Yu ◽  
Jiatai Pang ◽  
...  
Keyword(s):  
Time Series ◽  
Large Scale ◽  
Ground Deformation ◽  
Dynamic Change ◽  
Deformation Monitoring ◽  
Chinese Loess Plateau ◽  
Ground Subsidence ◽  
Shanxi Province ◽  
Environment Change ◽  
Loess Area

In recent years, many cities in the Chinese loess plateau (especially in Shanxi province) have encountered ground subsidence problems due to the construction of underground projects and the exploitation of underground resources. With the completion of the world’s largest geotechnical project, called “mountain excavation and city construction,” in a collapsible loess area, the Yan’an city also appeared to have uneven ground subsidence. To obtain the spatial distribution characteristics and the time-series evolution trend of the subsidence, we selected Yan’an New District (YAND) as the specific study area and presented an improved time-series InSAR (TS-InSAR) method for experimental research. Based on 89 Sentinel-1A images collected between December 2017 to December 2020, we conducted comprehensive research and analysis on the spatial and temporal evolution of surface subsidence in YAND. The monitoring results showed that the YAND is relatively stable in general, with deformation rates mainly in the range of −10 to 10 mm/yr. However, three significant subsidence funnels existed in the fill area, with a maximum subsidence rate of 100 mm/yr. From 2017 to 2020, the subsidence funnels enlarged, and their subsidence rates accelerated. Further analysis proved that the main factors induced the severe ground subsidence in the study area, including the compressibility and collapsibility of loess, rapid urban construction, geological environment change, traffic circulation load, and dynamic change of groundwater. The experimental results indicated that the improved TS-InSAR method is adaptive to monitoring uneven subsidence of deep loess area. Moreover, related data and information would provide reference to the large-scale ground deformation monitoring and in similar loess areas.

scholarly journals Meso- and microscale sea-ice motion in the East Siberian Sea as determined from ERS-1 SAR Data

1999 ◽  
Vol 45 (150) ◽  
pp. 370-383 ◽  
Author(s):  
Kim Morris ◽  
Shusun Li ◽  
Martin Jeffries
Keyword(s):  
Time Series ◽  
Sea Ice ◽  
Large Scale ◽  
Vector Fields ◽  
Lateral Displacement ◽  
Motion Vector ◽  
Sar Interferometry ◽  
East Siberian Sea ◽  
Pack Ice ◽  
Sar Data

Abstract Synthetic aperture radar- (SAR-)derived ice-motion vectors and SAR interferometry were used to study the sea-ice conditions in the region between the coast and 75° N (~ 560 km) in the East Siberian Sea in the vicinity of the Kolyma River. ERS-1 SAR data were acquired between 24 December 1993 and 30 March 1994 during the 3 day repeat Ice Phase of the satellite. The time series of the ice-motion vector fields revealed rapid (3 day) changes in the direction and displacement of the pack ice. Longer-term (≥ 1 month) trends also emerged which were related to changes in large-scale atmospheric circulation. On the basis of this time series, three sea-ice zones were identified: the near-shore, stationary-ice zone; a transitional-ice zone;and the pack-ice zone. Three 3 day interval and one 9 day interval interferometric sets (amplitude, correlation and phase diagrams) were generated for the end of December, the begining of February and mid-March. They revealed that the stationary-ice zone adjacent to the coast is in constant motion, primarily by lateral displacement, bending, tilting and rotation induced by atmospheric/oceanic forcing. The interferogram patterns change through time as the sea ice becomes thicker and a network of cracks becomes established in the ice cover. It was found that the major features in the interferograms were spatially correlated with sea-ice deformation features (cracks and ridges) and major discontinuities in ice thickness.

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