Determination of Meandering Parameters on a Section of the Zhizdra River Channel in the Kaluga Region Using GIS-technologies

Abstract

The purpose is to study the parameters of the dynamics of the displacement of the shoreline of the Zhizdra River in free meandering of the channel near the village of Il'inskoye, Peremyshl district in the Kaluga region. Materials and methods. Topographic map of sheet N-37-49 of the 1988 survey, and the ESRI satellite map showing the state of the terrain for 2020 were used to determine the parameters of meandering and estimate the speed of movement of a section of the Zhizdra Riverbank. Conclusions about the development of meandering in the study section are made based on a comparative analysis of maps by means of the geoinformation system QGIS. Results and discussion. Digitization of the position of the bend was done by QGIS analysis tools, linear and angular morphological parameters of free meandering were determined by computational tools, the average rate of shore cutting (2,29 m/year) was calculated too. It was found that the degree of development of the free bend during the study period increased by 8,6 m (0,26 m/year), the wave of the bend and the radius of curvature decreased by 120,45 m (-3,76 m/year) and 16,93 m (-0,53 m/year), the bending deflection and the length of the bend increased by 117,00 m (3,66 m/year) and 169,93 m (5,31 m/year). Conclusions. In modern times, the bend morphodynamically develops in a loop-like (sinusoidal) type, is characterized by a high degree of steepness and is in the final cycle of its development. The straightening of the Zhizdra channel and the formation of floodplain oxbow will occur while maintaining the current rate of shore cutting of the bends for 30 years. This section can be classified as relatively stable with a moderate degree of danger of channel processes (2 points).