Abstract
The method of constructing a hydrodynamic model of a large river is described in the work using the example of a section of the Volga River south of the Volzhskaya HPP. The construction of reliable hydrodynamic models of real river systems requires actual digital elevation models (DEM). Natural changes in the characteristics of river bed with time require updating and subsequent verification of DEM. We consider 100-kilometers section of the Volga River south of the Volzhskaya HPP, which determines the hydrological regime of the entire Volga-Akhtuba floodplain (VAF) right up to the Caspian Sea. The algorithm for constructing the DEM of bottom topography, based on a comparative analysis of the results of numerical hydrodynamic modeling and data on the dynamics of water levels at gauging stations, is proposed. In order to reconcile the changes in the water level H(t) in the numerical hydrodynamic model with the observed dependence, we vary the characteristics of the local sectors of the bottom.
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