Science Service System

Summary of Proposal LAN1560

TitleMonitoring of megacity ground deformations using different PS-INSAR techniques: A case study of Moscow and St. Petersburg, Russia.
Investigator Mikhailov, Valentin - Schmidt Institute of physics of the Earth, Russian academy of sciences, Joint analysis of satellite and surface data
Team Member
Dr. Hooper, Andy - TU Delft, Aerospace engineering and remote sensing
Dr Kiseleva, Elena - Schmidt Institute of Physics of the Earth IPE RAS, Laboratory of Joint geodynamic interpretation of satellite and surface data
SummaryMain objectives. Moscow and St. Petersburg develop very rapidly and as many people believe without proper architectural and engineering control. This construction boom calls for monitoring of the ground deformations in the cities. There are many examples of hazardous processes in both of them. Collapses of buildings in result of karst gaps formation or fast outflow of water-saturated sands have already occurred in Moscow. St. Petersburg is build on a huge marsh, many of its historical buildings are presently in danger. Wide area of subsidence develops in result of metro tunnel collapse. The problem is that there is no regular monitoring of the cities, even great advantage of PS-INSAR methods to investigate ground displacements has been already demonstrated. Thus, our main objective is to demonstrate efficiency ofPS-INSAR methodsfor monitoring of ground deformations in Moscow and St. Petersburg using TerraSAR-X images. Participation of MSU students in the project permits to start formation of SAR specialists and thus promote the SAR technologies in Russia. Another objective is in development of methods for SAR data processing and interpretation. SAR data processing includes a number of steps and every step calls for decisions regarding which corrections to introduce, which type of filtering to apply, which values for parameters of interpolation, filtration or unwrapping to assign.We stated a problem to develop a procedure for multiple calculations trying different data and methods and changing different parameters to get time-series which meet specified criteria of quality and put in agreement SAR and surface data. Thus, we would like to test this procedure on the TSX archive data for the Moscow and St. Petersburg. Ground deformations for Moscow found by processing of TSX images (stating with 2009) will be compared with those from ERS and Envisat images to study long-term tendencies in ground deformations. Natural object. Moscow is a huge city with lots of suburbs. It is situated on the banks of the Moscow River and is also crossed by many smaller rivers running to it. The topography is more or less plain but there exist regions of highlands and also river floodplains with made-up ground. St. Petersburg is also a big city although much less than Moscow. It was founded in 18 century on marshes. Thus, its main problem is underground waters and weak soil which may cause unexpected subsidence. Rapid economic development of Moscow and St. Petersburg and building activity leads to redistribution of surface loads. Underground constructions break soli structure. All this case surface deformations which may be dangerous for high-rise buildings as well as metro lines, tunnels and other facilities. Examples of catastrophic processes are collapse of metro tunnel in St. Petersburg, collapse of several buildings in Moscow in result of karst gaps formation. Methods. We suggest applying two modifications of PS technique StaMPS (developed in Stanford University by A. Hooper) and DePSI (developed in TU Delft by R. Hansen). Data required. We ask for about 80 archived TerraSAR images of 77 descending track TSX-1 mission covering the period from 11/09/2009 to up to April 2013. The centre of the study area has coordinates 55.75N and 37.6 E. Radius is about 25 km. For St. Petersburg we ask for about 40 archive images from ascending track 130 TSX-1 and TDX-1 missions from 28/07/2011 up to April 2013. The centre of the study area has coordinates 59.9N and 30.38 E. Radius is about 20 km. The table of images applied for is attached. Deliverables include annual and final reports, presentations at Russian and International meetings, papers in Russian and International scientific journals. Funding. Project will be funded from budget of Schmidt Institute of Physics of the Earth, Russian academy of Sciences and grants of Russian Foundation for Basic Research.

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