Abstract
Turkey, as a developing country, is designing and performing massive construction projects around Istanbul. Beginning from the 1960s, rapid urbanization has been taking place due to industrialization, which brings an increase in the population. Yet, construction projects have been accelerated especially during the last decade, and many new projects are scheduled to be completed in a short time. Ground-based observations are generally carried out to monitor the deformations within construction sites, especially through geometric levelling, and GNSS techniques. However, in most cases, these monitoring measurements are only scheduled within the period of the construction process, and ensuing deformations are usually not considered. In addition to these techniques, the space-based interferometric technique can also be used to define the line of sight surface displacements with high accuracy, using the phase difference between image result for synthetic aperture radar images. In particular, Persistent Scatter Interferometry is one of the interferometric methods that are capable of defining the two-dimensional (vertical and horizontal) deformation for the desired epoch with a high temporal resolution. Thus it can be used as a complementary method for monitoring ground deformations, where the measurement is made by ground-based observations. In this study, the deforming areas related to underground metro construction are investigated through significant displacements between 2015 and 2018 of Sentinel-1 space-borne SAR data using the PSI technique. These results are validated by comparison with available levelling data corresponding to the new metro line.
Highlights
Urbanization projects have been increasing due to the governmental policies in Turkey since the 1960s
The aims of this study are as follows: (1) detection of the deforming areas caused by the construction process on the ongoing metro line located in the Asian part of Istanbul and (2) investigation of near-real-time deformation monitoring through using Sentinel-1 data to prevent subsidence related collapses in large scale construction projects of Istanbul (Fig. 1)
We focused on six stations that we have considered as deforming, according to the time series of the Sentinel-1 Line of Sight (LOS) data and ground levelling observations
Summary
Urbanization projects have been increasing due to the governmental policies in Turkey since the 1960s. The Asian side of Istanbul has been in a process of urbanization with huge residence and transportation projects. That these projects have to be investigated and monitored using the tools of InSAR, to quantify and detect possible deforming areas along with the construction sites to support sustainable urbanization. The aims of this study are as follows: (1) detection of the deforming areas caused by the construction process on the ongoing metro line located in the Asian part of Istanbul and (2) investigation of near-real-time deformation monitoring through using Sentinel-1 data to prevent subsidence related collapses in large scale construction projects of Istanbul (Fig. 1)
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