Space monitoring of water stream in estuarial areas (by the example of the Dnieper and the Danube)

1Fedorovskyi, OD, 2Khyzhniak, AV, 2Diachenko, TN, 2Yakimchuk, VG, 2Pidhorniak, DL, 2Sukhanov, KYu., 2Tomchenko, OV
1State institution «Scientific Centre for Aerospace Research of the Earth of the Institute of Geological Sciences of the National Academy of Sciences of Ukraine», Kyiv, Ukraine
2State institution «Scientific Centre for Aerospace Research of the Earth of the Institute of Geological Science of the National Academy of Sciences of Ukraine», Kyiv, Ukraine
Space Science and Technology 2017, 23 ;(2):11-16
https://doi.org/10.15407/knit2017.02.011
Section: Study of the Earth from Space
Publication Language: Ukrainian
Abstract: 
We propose a new method of estimation of river estuary water stream by structure characteristic. The method is based on the dependence of normalized azimuthal spectral density on the angular direction. We applied this method to a space monitoring data and conducted a comparative analysis of hydrological characteristics of the Dnieper estuary and the Kilia Danube Delta in a period from 1986 to 2015. It was found that the image spectra of the Dnieper mouth area from 1986 to 2015 have not changed either in intensity or in azimuth location, as opposed to the Danube delta, where the water flows have endured significant changes during the analyzed period.
Keywords: Fourier spectrum, hydrological characteristics, space monitoring
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