Построение цифровых моделей рельефа местности для речных пойм

Abstract

The procedure for constructing a digital elevation model (DEM) of the northern part of the Volga-Akhtuba interfluve (VAI) is described. We take the elevation matrix of SRTM data as the basis for further refining and updating spatial data using satellite imagery, GPS measurements, depth surveys of the Volga and Akhtuba riverbeds. Important sources of high-altitude data for VAI are observations of the shorelines dynamics of small temporary reservoirs (lakes, ducts, water spills), which arise during the spring flood and disappear during the low-flow period. The system of digitized coastlines at different points in time can significantly improve the quality of the DEM. Our method of constructing digital elevation models includes an iterative algorithm that uses the results of the DEM morphostructural analysis and the numerical hydrodynamic simulation of the VAI flooding.