Numerical Modeling of Non-Uniform Sediment Transport in River Channels

The mathematical model for simulating deformations of river channels composed of heterogeneous alluvium has been developed. The combination of shallow water equations and a three-layer model is used to describe the fluid flow and non-uniform sediment transport in bed (layer II) and suspended (layer III) loads. Changes in the fractional composition of unerodible bottom sediments (layer I) are also considered. The algorithm provides mass conservation for each fraction. The comparison of calculations results and experimental data (hydraulic washing of a desilting basin from sediments and armoring processes in heterogeneous soils) confirms the operability of the model. The model is applied to calculate the silting and hydraulic washes of the reservoir of a hydroelectric power station on a mountain river.     

Simulating Flash Floods in Small Rivers of the Northern Caucasus with the Use of Data of Automated Hydrometeorological Network

Water Resources - Examples are given for numerical modeling of rain-induced flash floods in mountain areas based on actual and forecast data on precipitation. The calculated hydrographs are...     

Modeling Ice-Jam Floods in the Frameworks of an Intelligent System for River Monitoring

Water Resources - The article presents the results of adaptation and application of two-dimensional hydrodynamic model STREAM_2D to reproduce the characteristics of ice-jam-induced floods in the...     

Numerical Modeling of the Behavior of a Destructive Rain Flood on a Mountain River

Water Resources - The objective of this study was to provide the most accurate presentation of the behavior of a disastrous rain flood, which had resulted in destruction of a dam, casualties, and...     

Justification of Hydrological Safety Conditions in Residential Areas Using Numerical Modelling

The present paper looks at the application of modern technology of numerical modelling to simulate natural and human-induced river floods of residential areas. The modelling is based on the use of 2D shallow-water equations and 3D digital terrain models. The application of adaptive mesh generator and effective algorithms of parallel computing using NVIDIA graphics processors with CUDA technology enables calculating the areas and depths of flooding in a big city, taking into account all residential, industrial, and road constructions. Each one of them is specifically singled out on the mesh. This enables the reproduction of the real course of a flood well.