PSI - Issue 20

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S.A. Tikhonova et al. / Procedia Structural Integrity 20 (2019) 230–235 S.A. Tikhonova et al. / Structural Integrity Procedia 00 (2019) 000 – 000

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Fig.1. Plot № I, II and III near Lensk, Neryungri and Vitim

Using the values of calculated NDVI of the main and background sites in tables 1 and 2, we can see that values of vegetation index on the sites next to the pipeline before construction (2006) and on the background sites are the same. Then, NDVI values on the main ones become lower than in the sections that are located at a distance of 1 km from the pipeline. Vegetation, in the main areas near the pipeline, becomes more depressed than in the background. This is especially characteristic of the construction period and the start of operation of pipeline, time of activation of geocryological processes along the pipeline route. Photographs of airborne visual flight and field engineering and geological studies of areas during this period confirm the interpretation of satellite information.

Table 1. The result of the calculation of NDVI on the main sections of the linear part: Main areas Lensk Vitim Neryungri 2006 0,45 0,55 0,41 2009 0,50 0,56 0,39 2011 0,50 0,48 0,44 2015 0,43 0,46 0,31 2017 0,45 0,36 0,32 Table 2. The result of the calculation of NDVI on the background sections of the linear part: Background areas Lensk Vitim Neryungri 2006 0,44 0,54 0,38 2009 0,54 0,55 0,40 2011 0,52 0,40 0,43 2015 0,39 0,41 0,30 2017 0,40 0,37 0,36