Land subsidence of the northern Kanto plains caused by ground water extraction detected by JERS-1 SAR interferometry

2002 ◽  
Author(s):  
H. Nakagawa ◽  
M. Murakami ◽  
S. Fujiwara ◽  
M. Tobita
Keyword(s):  
Ground Water ◽  
Land Subsidence ◽  
Water Extraction ◽  
Sar Interferometry

scholarly journals Activity Characteristics and Safety distance of Gaoliying Ground Fissure in Beijing

2019 ◽  
Vol 79 ◽  
pp. 02009
Author(s):  
Haigang Wang ◽  
Tongchun Qin ◽  
Haipeng Guo ◽  
Juyan Zhu ◽  
Yunlong Wang ◽  
...  
Keyword(s):  
Ground Water ◽  
Land Subsidence ◽  
Groundwater Level ◽  
Hanging Wall ◽  
Three Dimensional ◽  
Vertical Direction ◽  
Rapid Decrease ◽  
Ground Fissure ◽  
Ground Fissures ◽  
Safety Distance

In all ground fissures in Beijing, Gaoliying Ground Fissure has characteristics of highly activity, and it cause serious damages on constructoins. With the distribution as well as the development of land subsidence and the change of the groundwater level, a series of work has been conducted to explain the mechanism of the formation of Gaoliying Ground Fissure. For example, field damage investigations and trench observations were used to define the affected distance of ground fissure; three-dimensional deformation was monitored to determine active characteristic of ground fissure. This paper points out that Gaoliying ground fissure is controlled by Huangzhuang-Gaoliying Fault, which mainly moves in the vertical direction. The rapid decrease of the ground water level greatly increases the development of ground fissure. The distance of damaged zones affected by ground fissure in the hanging-wall of the fault reaches 49.5m, and the distance of damaged zones in the footwall of the fault is 17.5 m. A suggested safety distance of type-one and type-two buildings is 100 m. For type-three buildings, the suggested safety distance is 80 m.

scholarly journals Insar Maps of Land Subsidence and Sea Level Scenarios to Quantify the Flood Inundation Risk in Coastal Cities: The Case of Singapore

2020 ◽  
Vol 12 (2) ◽  
pp. 296 ◽  
Author(s):  
Joao Catalao ◽  
Durairaju Raju ◽  
Giovanni Nico
Keyword(s):  
Sea Level Rise ◽  
Sea Level ◽  
Land Subsidence ◽  
Central Area ◽  
Coastal Areas ◽  
Sar Interferometry ◽  
Asia Pacific ◽  
Flood Vulnerability ◽  
Global Mean Sea Level ◽  
Global Sea Level

Global mean sea level rise associated with global warming has a major impact on coastal areas and represents one of the significant natural hazards. The Asia-Pacific region, which has the highest concentration of human population in the world, represents one of the larger areas on Earth being threatened by the rise of sea level. Recent studies indicate a global sea level of 3.2 mm/yr as measured from 20 years of satellite altimetry. The combined effect of sea level rise and local land subsidence, can be overwhelming for coastal areas. The Synthetic Aperture Radar (SAR) interferometry technique is used to process a time series of TerraSAR-X images and estimate the land subsidence in the urban area of Singapore. Interferometric SAR (InSAR) measurements are merged to the Representative Concentration Pathway (RCP) 4.5 and RCP 8.5 sea-level rise scenarios to identify projected inundated areas and provide a map of flood vulnerability. Subsiding rates larger than 5 mm/year are found near the shore on the low flat land, associated to areas recently reclaimed or built. The projected flooded map of Singapore are provided for different sea-level rise scenarios. In this study, we show that local land subsidence can increase the flood vulnerability caused by sea level rise by 2100 projections. This can represent an increase of 25% in the flood area in the central area of Singapore for the RCP4.5 scenario.

Effect of Ground Fissures on Subsidence in Xi'an Metro Line 2

2013 ◽  
Vol 353-356 ◽  
pp. 333-336
Author(s):  
Chao Liu ◽  
Li Jun Su ◽  
Xing Qian Xu
Keyword(s):  
Ground Water ◽  
Land Subsidence ◽  
Ground Subsidence ◽  
Ground Fissures ◽  
Prevention And Treatment ◽  
The Relationship

The subsidence value in fissure site and no fissure site respectively is calculated when ground water is pumped. The relationship between ground fissures and ground subsidence is determined by calculation and then the cause of land subsidence is concluded. This study can solve the problem of ground subsidence in the construction of south section of Xian metro line 2 and it offers theoretic basis of prevention and treatment.

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