Сопоставление эффективности использования современных геодезических методов в изучении последствий бобровой деятельности на малых реках

Abstract

Multiple increase in the beaver population on the East European Plain has led to the appearance of a large number of beaver dams and ponds on small rivers. At present, the problem of regulating small rivers in this region remains poorly studied due to the above circumstances. This study presents the results of a comparison of modern geodetic methods obtained using an electronic total station, GNSS equipment and UAVs. The small river Morkvashinka, flowing along the northern tip of the Volga Upland, was chosen as the object of the study. The spatial coordinates and altitudes measured by the GNSS receiver generally agree well with the tacheometric survey data. The height difference is 0.5 cm (standard deviation – 0.07). However, the main disadvantage of an electronic total station, which limits its use for surveying linearly elongated objects and small river valleys, is the lack of direct visibility of the objects being photographed from the device due to the highly dissected territory, the tortuosity of the river and dense vegetation. Using orthophoto and digital terrain models obtained from unmanned aerial vehicles, it is not always possible to accurately determine the border of the coastline, as well as the absolute heights of the dam, floodplain, terraces, water edge, channel marks (pond depth) due to dense vegetation. However, the river bed and floodplain, beaver dams and ponds are clearly visible on them.