Methodology for the automated identification of drainage basins using digital elevation models (on the example of Skole district, Lviv Oblast)
Students Name: Ivanevych Andrii Romanovych
Qualification Level: magister
Speciality: Photogrammetry and Remote Sensing
Institute: Institute of Geodesy
Mode of Study: full
Academic Year: 2020-2021 н.р.
Language of Defence: ukrainian
Abstract: Ivanevych A.R., Protsyk M.T. (supervisor). Methodology for the automated identification of drainage basins using digital elevation models (on the example of Skole district, Lviv Oblast). Master’s thesis. - Lviv Polytechnic National University, Lviv, 2020. Extended abstract The primary task of the research is the analysis of the method of allocation of basins by the figure of the relief model obtained from the radar survey "SRTM", namely the obtaining of hydrological and morphometric parameters from the model. Studies of geomorphological methods that have been developed over the past few years have provided a means of measuring the area and shape properties of watersheds. (Arthur N. Strahler, Amer. Geophys. Union, 1957.) [1]. In the field of "DEM" first of all developed computer technologies and technologies of digital image processing which allow to carry out processes of extraction of the automated collection of parameters of watersheds and to reduce labor and time expenses. Engineering and Remote Sensing, Vol 60, No. 11, p., 1327-1332.) [2]. Experimental results confirmed that the filling of the terrain and the accuracy of the reconstruction when filling the closed dispersions "Fill DEM" are better than that illustrated by the traditional method of interpolation. (Zhang, C .; DEM Void Filling Based on Context Attention Generation Model., 2020, Geo-Inf 9, 734.) [3]. Yermolaev O.P. Claims that the raster "Flow Accumulation" calculated for the DEM is a source for creating a raster model of the drainage network. (Geomorphology. 2012. № 2. pp. 50-58.) [4]. Strahler explains that the method of watercourse order involves assigning the ordinal number of strings in the network of watercourses based on the number of their tributaries. (.Arthur N. Strahler, Amer. Geophys. Union, 1957.)[1]. Construction of catchment basins consists of three operations: binding of mouth points to the raster of accumulation of runoff, carrying out of borders of catchments in the raster mode, vectorization of pools. (Mozzherin V., Proceedings IAHS-AISH. 2012. № 2. pp. 251-258.) [5]. Study object-Space image with high-altitude terrain data (SRTM) on the territory of Skole district of Lviv region. Scope ofresearch- Methods of automated isolation watershed for the digital model of relief. Goal of research: Automatic selection watersheds and obtaining hydrological and morphometric characteristics of the watershed, which is based on digital elevation model. As a result of research, an automated method for determining hydrological and morphometric characteristics was tested, and statistical data were obtained on the territory of Skoliv district of Lviv region, 590 basins were identified, with an average height of 400 m, above the Baltic Sea, with a total area of 1407. km2. These relief parameters can be used in the economic sphere, in landscape analysis of the territory, for the construction of ski resorts, as well as zoning, and to use minerals in assessing the geo-ecological condition of the territories. Key words: drainage basins, pools vectorization, raster «Flow Accumulation», anchor points mouth, filling in closed expressions «Fill DEM», order streams. References 1. Arthur N. Strahler . Quantitative analysis of watershed geomorphologe. Trans. Amer. Geophys. Union, 1957,38,№6. 2. Bolstad, P. V. and Stowe, T., 1994, An Evaluation of DEM Accuracy: Elevation, Slope and Aspect, Photogrammetric Engineering and Remote Sensing, Vol. 60, No. 11, p.1327-1332. 3. Zhang, C.; Shi, S.; Ge, Y.; Liu, H.; Cui, W. DEM Void Filling Based on Context Attention Generation Model. ISPRS Int. J. Geo-Inf. 2020, 9, 734. 4. Yermolaev O.P., Maltsev K.A., Mozherin VV., Mozherin V.I.Global geoinformation system "Drainage of suspended sediments in the river basins of the Earth" // Geomorphology. 2012. № 2. c. 50-58. 5. Maltsev K., Yermolaev O., Mozzherin V. Mapping and spatial analysis of suspended sediment yields from the Plain // Proceedings IAHS-AISH. 2012. pp. 251-258.