STUDY OF THE CONDITIONS OF RIVERBED FORMATION OF THE PEREDKARPATTIA RIVERS WITHIN THE ALLUVIAL PLAINS

Abstract

The article reveals the results of the study of the main factors of river riverbed formation within the foothills.Based on the results of previous studies, archival materials and own works, the effect of the main factors of channel formation was investigated according to the author's functional-basin scheme for the conditions of alluvial plains. The territory of Peredkarpathia and the adjacent parts of the Carpathians and Podillia, which are characterized by extended areas of river valley bottoms filled with alluvium (alluvial plains), were chosen for the study. The artificial limitation of the research area is the state border of Ukraine. The selected territory of the study was tentatively called the hydrological and riverbed science Peredkarpathia, but it goes beyond the geomorphological Peredkarpathia It is proposed to study the features of riverbed formation conditions of the main watercourses within the study area (alluvial plains) in stages. The author singled out four levels of research detailing, each of which has a corresponding plan (research algorithm). At the first (highest) level of consideration, an overview map of alluvial plains was drawn up, showing alluvial plains within the study area against the background of the general structure of the territory, the main orotectonic structures. On the second, survey maps of the alluvial plains of the first order were created. They show the main alluvial plains of the region as river-valley systems associated with negative orotectonic structures and adjacent formations. At the third level of consideration, we compiled survey and analytical maps of second-order alluvial plains. Here are shown the extended areas of the bottom of the valleys of the main rivers within the alluvial plains of the first order. The maps also show the main features of the internal relief of the bottom of the valleys; hydrographic grid; generalized boundaries of multi-year riverbed formation bands, floodplains and boundaries of homogeneous sections of riverbeds and floodplains. One hundred homogeneous sections of riverbeds and floodplains on 18 main rivers were identified within the study area, and a description of their sequence along the rivers within the alluvial plains was also made. At the fourth stage, we selected analytical maps of parts of the alluvial plains of the second order. They reflect the details of the topography of the bottom of river valleys (as well as the hydrographic grid as an indicator of the structure of the bottom), the presence of bedrock outcrops for the analysis of local conditions of the development of the stream-channel system. Keywords. geohydromorphological analysis; riverbed processes; alluvial plains; homogeneous areas; riverbed-forming flows.