scholarly journals Land Subsidence Observed in the Merchtem Area (Flanders) – 30 Years of SAR Data Associated to Groundwater Withdrawal?

2021 ◽  
Author(s):  
Atefe Choopani ◽  
Pierre-Yves Declercq ◽  
Alain Dassargues ◽  
Xavier Devleeschouwer
Keyword(s):  
Land Subsidence ◽  
Groundwater Withdrawal ◽  
Sar Data

scholarly journals Spatial Analysis of Land Subsidence in the San Luis Potosi Valley Induced by Aquifer Overexploitation Using the Coherent Pixels Technique (CPT) and Sentinel-1 InSAR Observation

2020 ◽  
Vol 12 (22) ◽  
pp. 3822
Author(s):  
María Inés Navarro-Hernández ◽  
Roberto Tomás ◽  
Juan M. Lopez-Sanchez ◽  
Abraham Cárdenas-Tristán ◽  
Jordi J. Mallorquí
Keyword(s):  
Land Subsidence ◽  
Strong Relationship ◽  
Satellite System ◽  
Groundwater Withdrawal ◽  
Persistent Scatterer Interferometry ◽  
San Luis ◽  
Persistent Scatterer ◽  
San Luis Potosi ◽  
Global Navigation Satellite ◽  
San Luis Potosí

The San Luis Potosi metropolitan area has suffered considerable damage from land subsidence over the past decades, which has become visible since 1990. This paper seeks to evaluate the effects of groundwater withdrawal on land subsidence in the San Luis Potosi Valley and the development of surface faults due to the differential compaction of sediments. For this purpose, we applied the Coherent Pixels Technique (CPT), a Persistent Scatterer Interferometry (PSI) technique, using 112 Sentinel-1 acquisitions from October 2014 to November 2019 to estimate the deformation rate. The results revealed that the deformation areas in the municipality of Soledad de Graciano Sánchez mostly exhibit subsidence values between −1.5 and −3.5 cm/year; whereas in San Luis Potosi these values are between −1.8 and −4.2 cm/year. The PSI results were validated by five Global Navigation Satellite System (GNSS) benchmarks available, providing a data correlation between the results obtained with both techniques of 0.986. This validation suggests that interferometric derived deformations agree well with results obtained from GNSS data. The strong relationship between trace fault, land subsidence,e and groundwater extraction suggests that groundwater withdrawal is resulting in subsidence induced faulting, which follows the pattern of structural faults buried by sediments.

scholarly journals Investigation of Land Subsidence Based on the Column Element Settlement Model in a Soft-Soil Area

Geofluids ◽  
2019 ◽  
Vol 2019 ◽  
pp. 1-16 ◽  
Author(s):  
Yang Chen ◽  
Wen Zhao ◽  
Yong Huang ◽  
Pengjiao Jia
Keyword(s):  
Land Subsidence ◽  
Yangtze River ◽  
Coupling Effect ◽  
Soft Soil ◽  
Yangtze River Delta ◽  
Groundwater Withdrawal ◽  
Ground Settlement ◽  
Investigation Area ◽  
Column Element ◽  
The Yangtze River Delta

The Su-Xi-Chang area is located in the Yangtze River Delta in southeastern Jiangsu Province, China. More than 2 m cumulative land subsidence has occurred since 1980s. A range of monitoring programs, geological investigations, and numerical modeling has been implemented in order to establish a regional rehabilitation plan. In this paper, the column element settlement model (CESM) has been established to investigate the coupling effect of soil self-weight, upper loads, and groundwater withdrawal on land subsidence. The model has been verified by comparing with the land subsidence records in Changzhou and further applied to the investigation area. The results show that extensive groundwater withdrawal is the main cause of the land subsidence. Settlement caused by soil self-weight increases with the depth and decreases with upper loads, while settlement caused by upper loads increases with the intensity of upper loads and decreases with depth. The proportion of ground settlement caused by soil self-weight, upper loads, and groundwater withdrawal is also investigated.

scholarly journals Chronological reflection on monitoring urban areas subsidence due to groundwater extraction

2019 ◽  
Vol 85 ◽  
pp. 07015 ◽  
Author(s):  
Alina Radutu ◽  
Radu Constantin Gogu
Keyword(s):  
Land Subsidence ◽  
Urban Areas ◽  
Urban Expansion ◽  
Groundwater Withdrawal ◽  
Groundwater Extraction ◽  
Monitoring Methods ◽  
Vertical Displacements ◽  
Order Of Magnitude ◽  
History Of ◽  
Subsidence Monitoring

Land subsidence affects urban areas worldwide. Sometimes it could be driven by intensive groundwater withdrawal to assure different urban needs and functionalities. Some of these urban areas have a long history of subsidence that covers almost a century. The aim of this paper is to present the evolution of several urban areas affected by land subsidence, the methods used to monitor vertical displacements along the decades in relationship to the groundwater extraction associated to the urban expansion, and the mitigation techniques used for countering the effects of intensive groundwater withdrawal. Even the originally applied subsidence monitoring methods (such as geometric levelling) are still very sensitive, in terms of time consuming, covered area, and financial effort, these methods might be complemented by new methods based on Synthetic Aperture Radar Interferometry (InSAR). InSAR methods show also a significant progress during the last decades when considering the subsidence sensed order of magnitude.

Mechanism and Prevention of Urban Land Subsidence

2011 ◽  
Vol 261-263 ◽  
pp. 1749-1754
Author(s):  
Yu Qi Li ◽  
Tian Quan Weng ◽  
Yi Ran Liu
Keyword(s):  
Effective Stress ◽  
Land Subsidence ◽  
Soil Compaction ◽  
Regional Differences ◽  
Soil Loss ◽  
Urban Land ◽  
Groundwater Withdrawal ◽  
Soil Particles ◽  
High Rise ◽  
Geological Conditions

This paper introduces the hazards of urban land subsidence which caused by excessive extraction of groundwater, the construction of high-rise buildings and excavation, then analyses their mechanisms. It is considered that the essence of land subsidence is due to the soil compaction caused by effective stress augment and the soil loss caused by excavation. Through further analysis of current works, we suggest that regional differences in geological conditions, building loads, repeated action of groundwater withdrawal and recharge, and meso-mechanism of soil particles should be considered when establishing land subsidence model.

scholarly journals MINING LAND SUBSIDENCE MONITORING USING SENTINEL-1 SAR DATA

2017 ◽  
Vol XLII-2/W7 ◽  
pp. 655-658 ◽  
Author(s):  
W. Yuan ◽  
Q. Wang ◽  
J. Fan ◽  
H. Li
Keyword(s):  
Law Enforcement ◽  
Land Subsidence ◽  
Coal Mine ◽  
Underground Mining ◽  
Mining Area ◽  
Mine Area ◽  
Optical Images ◽  
Sar Data ◽  
Comparison Of The Results ◽  
Subsidence Monitoring

In this paper, DInSAR technique was used to monitor land subsidence in mining area. The study area was selected in the coal mine area located in Yuanbaoshan District, Chifeng City, and Sentinel-1 data were used to carry out DInSAR techniqu. We analyzed the interferometric results by Sentinel-1 data from December 2015 to May 2016. Through the comparison of the results of DInSAR technique and the location of the mine on the optical images, it is shown that DInSAR technique can be used to effectively monitor the land subsidence caused by underground mining, and it is an effective tool for law enforcement of over-mining.

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