Abstract
The aim of the work is to study the horizontal displacements of the Siret riverbed from the settlement of Stara Zhadova to the village of Cherepkivtsi. Methodology: GIS analysis methods, mathematical data processing, analysis of Siret riverbed displacements were used to solve the issues raised in the work on horizontal displacements of the Siret riverbed. Semi-automatic digitization of the Siret riverbed on the scale maps: 1:75 000, 1:50 000, 1:25 000, 1:28000 was carried out and the lengths and coefficients of tortuosity were determined. Areas with the most pronounced meandering and changes in horizontal displacements of the channel are selected. The result of the study: For the study, the course of the river Siret was digitized from space images in 2016, which allowed to establish the coefficient of tortuosity, which is 1.52. Due to the vectorization of the water body on the topographic map of 1987 at a scale of 1:50 000, it was determined that the coefficient of tortuosity increased to 1.57. The military-topographic map of the Austro-Hungarian Empire was linked to the territory of the western part of Ukraine in 1889 and the coefficient of tortuosity along the digitized riverbed equal to 1.75 was calculated. The raster image was also digitized with the formation of vectorized layers on a 1957 map at a scale of 1:25 000 and the twist coefficient was determined to be 1.7. The study used the Austrian military topographic map of Galicia and Bukovina in 1861-1864 in modern western Ukraine, which calculated the coefficient of tortuosity at 1.9, which is the highest value for the entire observation period. The general overlay analysis showed that during the whole period of observations the channel was straightened, which led to a decrease in meandering processes along the entire length of the water body. Areas with the most pronounced meandering and areas with the greatest changes in horizontal displacements of the channel were identified: near the villages of Nova Zhadova, Cherepkivtsi, Kamyanka, Klynivka, and the town of Storozhynets. Scientific novelty: GIS analysis of horizontal displacements of the Siret riverbed during the 152-year observation period was carried out, which allowed to identify the main characteristic parts of the riverbed. Practical significance: the results of the study can be used in organizations and departments, in hydraulic services, in institutions involved in the design of river crossings, in regional and district water departments, as well as in research institutions.
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