Расчет морфометрических характеристик валов косы Долгая по цифровой модели рельефа

Abstract

In the last decade, digital elevation models (DEMs) based on surveys from unmanned aerial vehicles (UAVs) have been increasingly used to obtain quantitative characteristics of geomorphological objects of the coastal systems. The information of the morphological objects structure obtained with the help of such DEMs makes it possible to refine the details of the large coastal forms development. The aim of the work is to identify micro relief forms on the Dolgaya Spit, in particular, beach ridges, based on UAV survey. The need for filtering both at the point cloud level and after the creation of a DEM before conducting a geomorphological analysis is discussed in the article. An automated procedure for identifying the lines of the coastal ridges crests based on the DEM is given. Coastal ridges in the central part of the Dolgaya Spit and calculation of their morphometric characteristics are presented. Their average height is about 0.5 m, the width — 16 m. Analysis of the automated identification of coastal ridges crests and their comparison with ground-based observations showed a significant scatter in the values of morphometric characteristics along the ridges and, as a result, a bias in their point estimates during direct ground-based measurements.