Transient deformation induced by groundwater change in Taipei metropolitan area revealed by high resolution X-band SAR interferometry

2016 ◽  
Vol 692 ◽  
pp. 265-277 ◽  
Author(s):  
Hsin Tung ◽  
Horng-Yue Chen ◽  
Jyr-Ching Hu ◽  
Kuo-En Ching ◽  
Hongey Chen ◽  
...  
Keyword(s):  
High Resolution ◽  
Metropolitan Area ◽  
Sar Interferometry ◽  
Transient Deformation ◽  
X Band

scholarly journals Earth and Rock-Filled Dam Monitoring by High-Resolution X-Band Interferometry: Gongming Dam Case Study

2019 ◽  
Vol 11 (3) ◽  
pp. 246 ◽  
Author(s):  
Tao Li ◽  
Mahdi Motagh ◽  
Mingzhou Wang ◽  
Wei Zhang ◽  
Chunlong Gong ◽  
...  
Keyword(s):  
High Resolution ◽  
Incidence Angle ◽  
Sar Interferometry ◽  
Surface Moisture ◽  
X Band ◽  
Shrinking Process ◽  
Data Fusing ◽  
Dam Monitoring ◽  
Settlement Analysis

Middle-sized earth- and rock-filled dams with clay cores continue to settle by approximately 0.5–1.5% of their height for approximately 1–3 years after their construction phase. This paper investigates the use of high-resolution spaceborne Synthetic aperture Radar (SAR) interferometry to monitor this settlement process, with the case of the Gongming dam in China. The varieties of slope foreshortening and stretching in the radar coordinates are attributed to the radar’s local incidence angle and the dam’s slope heading, which are analysed in detail. Focusing on the embankment slope settlement analysis, the equations for calculating foreshortening and the line-of-sight deformation decomposition are derived in detail for the adjustment and data fusing. The scattering characteristics of different materials on the dam surface are analysed, including the grass slope, concrete slope, top road (crest), top wall, step, and ditch. According to the analysis of the precipitation data from a local meteorological station, the coherence losses on the slopes are mainly caused by surface moisture. Both the TerraSAR-X Spotlight (TSX-SL) data and the COSMO-SkyMed Strip Mode (CSK-SM) data are analysed by the stacking method to assess the slopes’ deformations. The TSX-SL data results show the highest rate of settlement as 2 cm/yr on the top of the dam slope, consistent with the clay core shrinking process. The CSK-SM data show a similar trend in the lower part of the dam slope but underestimate the deformation in the upper part of the slope.

Results of the Tokyo Metropolitan Area Convection Study for Extreme Weather Resilient Cities (TOMACS)

2019 ◽  
Vol 100 (10) ◽  
pp. 2027-2041 ◽  
Author(s):  
Ryohei Misumi ◽  
Yoshinori Shoji ◽  
Kazuo Saito ◽  
Hiromu Seko ◽  
Naoko Seino ◽  
...  
Keyword(s):  
High Resolution ◽  
Metropolitan Area ◽  
Extreme Weather ◽  
Polarimetric Radar ◽  
Tokyo Metropolitan ◽  
Tokyo Metropolitan Area ◽  
Social Experiments ◽  
Urban Impacts ◽  
X Band ◽  
The World

AbstractThe Tokyo Metropolitan Area Convection Study for Extreme Weather Resilient Cities (TOMACS) began as a Japanese domestic research project in 2010 and aimed to elucidate the mechanisms behind local high-impact weather (LHIW) in urban areas, to improve forecasting techniques for LHIW, and to provide high-resolution weather information to end-users (local governments, private companies, and the general public) through social experiments. Since 2013, the project has been expanded as an international Research and Development Project (RDP) of the World Weather Research Programme (WWRP) of the World Meteorological Organization (WMO). Through this project, the following results were obtained: 1) observation data for LHIW around Tokyo were recorded using a dense network of X-band radars, a C-band polarimetric radar, a Ku-band fast-scanning radar, coherent Doppler lidars, and the Global Navigation Satellite System; 2) quantitative precipitation estimation algorithms for X-band polarimetric radars have been developed as part of an international collaboration; 3) convection initiation by the interaction of sea breezes and urban impacts on the occurrence of heavy precipitation around Tokyo were elucidated by a dense observation network, high-resolution numerical simulations, and different urban surface models; 4) an “imminent” nowcast system based on the vertically integrated liquid water derived from the X-band polarimetric radar network has been developed; 5) assimilation methods for data from advanced observation instruments such as coherent Doppler lidars and polarimetric radars were developed; and 6) public use of high-resolution radar data were promoted through the social experiments.

Experimental Validation of Conifer and Broad-Leaf Tree Classification Using High Resolution PolSAR Data above X-Band

2019 ◽  
Vol E102.B (7) ◽  
pp. 1345-1350 ◽  
Author(s):  
Yoshio YAMAGUCHI ◽  
Yuto MINETANI ◽  
Maito UMEMURA ◽  
Hiroyoshi YAMADA
Keyword(s):  
High Resolution ◽  
Experimental Validation ◽  
X Band ◽  
Broad Leaf

Evaluation of atmospheric aerosols in the metropolitan area of São Paulo simulated by the regional EURAD-IM model on high-resolution

2020 ◽  
Author(s):  
Ediclê De Souza Fernandes Duarte ◽  
Philipp Franke ◽  
Anne Caroline Lange ◽  
Elmar Friese ◽  
Fábio Juliano da Silva Lopes ◽  
...  
Keyword(s):  
High Resolution ◽  
Metropolitan Area ◽  
Atmospheric Aerosols ◽  
Sao Paulo ◽  
São Paulo ◽  
Im Model

scholarly journals A comparative case study of MTInSAR approaches for deformation monitoring of the cultural landscape of the Shanhaiguan section of the Great Wall

2021 ◽  
Author(s):  
Hang Xu ◽  
Fulong Chen ◽  
Wei Zhou
Keyword(s):  
High Resolution ◽  
Linear Structure ◽  
Deformation Monitoring ◽  
Sar Interferometry ◽  
Comparative Case Study ◽  
Rock Falls ◽  
High Resolution Data ◽  
Heritage Sites ◽  
Great Wall

Abstract The Great Wall of China is one of the largest architectural heritage sites globally, and its sustainability is a significant concern. However, its large extent and diverse characteristics cause challenges for deformation monitoring. In this study, the Shanhaiguan section of the Great Wall was investigated in a case study to ascertain the damage and potential hazards of the architectural site. Two standard multi-temporal synthetic aperture radar interferometry (MTInSAR) technologies, including persistent scatterer SAR interferometry (PSInSAR) and small baseline subset (SBAS) SAR interferometry, were used for deformation monitoring using high-resolution TerraSAR-X data acquired in 2015–2017. The results of the two MTInSAR approaches revealed the health condition of the Great Wall. The Shanhaiguan section was stable, but local instabilities caused by rock falls were detected in some mountainous areas. In addition, the applicability of PSInSAR and SBAS was evaluated. The performance analysis of the two approaches indicated that a more reliable and adaptable MTInSAR technique needs to be developed for monitoring the Great Wall. This study demonstrates the potential of MTInSAR technology with high-resolution data for the health diagnosis of heritage sites with a linear structure, such as the Great Wall.

scholarly journals The High-Resolution Digital-Beamforming Airborne SAR System DBFSAR

2020 ◽  
Vol 12 (11) ◽  
pp. 1710 ◽  
Author(s):  
Andreas Reigber ◽  
Eric Schreiber ◽  
Kurt Trappschuh ◽  
Sebastian Pasch ◽  
Gerhard Müller ◽  
...  
Keyword(s):  
High Resolution ◽  
Signal To Noise Ratio ◽  
Digital Beamforming ◽  
Remote Sensing Technique ◽  
High Resolution Imagery ◽  
X Band ◽  
The Status ◽  
Airborne Sar ◽  
German Aerospace ◽  
Near Future

Synthetic Aperture Radar (SAR) is an established remote sensing technique that can robustly provide high-resolution imagery of the Earth’s surface. However, current space-borne SAR systems are limited, as a matter of principle, in achieving high azimuth resolution and a large swath width at the same time. Digital beamforming (DBF) has been identified as a key technology for resolving this limitation and provides various other advantages, such as an improved signal-to-noise ratio (SNR) or the adaptive suppression of radio interference (RFI). Airborne SAR sensors with digital beamforming capabilities are essential tools to research and validate this important technology for later implementation on a satellite. Currently, the Microwaves and Radar Institute of the German Aerospace Center (DLR) is developing a new advanced high-resolution airborne SAR system with digital beamforming capabilities, the so-called DBFSAR, which is planned to supplement its operational F-SAR system in near future. It is operating at X-band and features 12 simultaneous receive and 4 sequential transmit channels with 1.8 GHz bandwidth each, flexible DBF antenna setups and is equipped with a high-precision navigation and positioning unit. This paper aims to present the DBFSAR sensor development, including its radar front-end, its digital back-end, the foreseen DBF antenna configuration and the intended calibration strategy. To analyse the status, performance, and calibration quality of the DBFSAR system, this paper also includes some first in-flight results in interferometric and multi-channel marine configurations. They demonstrate the excellent performance of the DBFSAR system during its first flight campaigns.

scholarly journals Advanced interpretation of subsidence in Murcia (SE Spain) using A-DInSAR data – modelling and validation

2009 ◽  
Vol 9 (3) ◽  
pp. 647-661 ◽  
Author(s):  
G. Herrera ◽  
J. A. Fernández ◽  
R. Tomás ◽  
G. Cooksley ◽  
J. Mulas
Keyword(s):  
Time Series ◽  
Metropolitan Area ◽  
Prediction Models ◽  
Time History ◽  
Element Model ◽  
Absolute Error ◽  
Sar Interferometry ◽  
Se Spain ◽  
Drought Period ◽  
Aquifer System

Abstract. Subsidence is a natural hazard that affects wide areas in the world causing important economic costs annually. This phenomenon has occurred in the metropolitan area of Murcia City (SE Spain) as a result of groundwater overexploitation. In this work aquifer system subsidence is investigated using an advanced differential SAR interferometry remote sensing technique (A-DInSAR) called Stable Point Network (SPN). The SPN derived displacement results, mainly the velocity displacement maps and the time series of the displacement, reveal that in the period 2004–2008 the rate of subsidence in Murcia metropolitan area doubled with respect to the previous period from 1995 to 2005. The acceleration of the deformation phenomenon is explained by the drought period started in 2006. The comparison of the temporal evolution of the displacements measured with the extensometers and the SPN technique shows an average absolute error of 3.9±3.8 mm. Finally, results from a finite element model developed to simulate the recorded time history subsidence from known water table height changes compares well with the SPN displacement time series estimations. This result demonstrates the potential of A-DInSAR techniques to validate subsidence prediction models as an alternative to using instrumental ground based techniques for validation.

scholarly journals Retrospective Dynamic Inundation Mapping of Hurricane Harvey Flooding in the Houston Metropolitan Area Using High-Resolution Modeling and High-Performance Computing

Water ◽  
2019 ◽  
Vol 11 (3) ◽  
pp. 597 ◽  
Author(s):  
Seong Noh ◽  
Jun-Hak Lee ◽  
Seungsoo Lee ◽  
Dong-Jun Seo
Keyword(s):  
High Resolution ◽  
Metropolitan Area ◽  
High Performance ◽  
Extreme Rainfall ◽  
Extreme Weather Events ◽  
Urban Flood ◽  
Precipitation Estimates ◽  
Inundation Extent ◽  
Quantitative Precipitation Estimates ◽  
Houston Metropolitan Area

Hurricane Harvey was one of the most extreme weather events to occur in Texas, USA; there was a huge amount of urban flooding in the city of Houston and the adjoining coastal areas. In this study, we reanalyze the spatiotemporal evolution of inundation during Hurricane Harvey using high-resolution two-dimensional urban flood modeling. This study’s domain includes the bayou basins in and around the Houston metropolitan area. The flood model uses the dynamic wave method and terrain data of 10-m resolution. It is forced by radar-based quantitative precipitation estimates. To evaluate the simulated inundation, on-site photos and water level observations were used. The inundation extent and severity are estimated by combining the retrieved water depths, images collected from the impacted area, and high-resolution terrain data. The simulated maximum inundation extent, which is frequently found outside of the designated flood zones, points out the importance of capturing multi-scale hydrodynamics in the built environment under extreme rainfall for effective flood risk and emergency management.

Sign in / Sign up

Export Citation Format

Share Document