The concept and some results of the development of an operational assessment tool, relief changes in landslide-prone, prone to collapse and beaches

Abstract

The paper describes the concept of building a specialized geoinformation tool designed for automated execution of a number of operations related to the implementation of calculations to assess changes in the relief of individual sections of the coastal zone of the sea. The tool is used for monitoring areas with low stability, prone to landslide and landslide processes, as well as beaches with a quantitative assessment of their spatially distributed volume changes. The initial data for calculations are arrays generated by the program for processing aerial photographs obtained with drones in photogrammetry mode. The algorithmic basis of the tool is the well-known geoinformation tool named Cut & Fill, used in conjunction with a database on the location and geometry of a large number of sections of the western coast of Crimea. The sequence of operations involves sampling from two or more arrays of points according to a given spatial location, performing vertical alignment with use the number of ground control points, performing interpolation into a regular grid of the size accepted for each section, calculations and presenting the results in tabular and graphical form. All the results obtained are saved for reuse and, in addition, their graphical analysis for spatial and vertical alignment is possible. It is also possible to build vertical sections on any row or column of a regular grid. Practical testing of the instrument was performed for three surveys of a landslide-prone area in the area of Tolstoy Cape a year before the catastrophic landslide on 18.01.2019, immediately after the event and in 2021 as a result of monitoring program. The operational assessment showed that all operations for performing calculations on two grids were performed within one hour after the survey with detailed and reliable results.