This research represents methodical approach and main results of water level hydrodynamic modeling for real summer low-water season and extreme spring flood of 1% probability. The object of modeling is 105 km length section of the Oka River in Moscow region between Kashira and Kolomna urban districts. Modeling object includes also the Moscow River section downstream the Severka River mouth. Two-dimensional hydrodynamic model constructed using DELFT-3D. To build the model we used the detailed elevation model and hydrological conditions based on in-situ measurements in 2019, special estimated discharge and water level time-series of 1% exceedance probability based on reference year observations and distributed Chezy coefficient calibration. The model implementation resulted in the actual detailed distribution of the water discharge, velocity and level along the Oka River section (including the downstream Moscow River) for low-water and extremely high water periods. These results are used for the flood zone delineation in the Kashira and Kolomna urban districts.

Water pollution in the river mouths in the northern European part of Russia has been assessed using chemical parameters, and the pollution for the period of 2012-2020 has been characterized. Water pollution in the mouths of the rivers Onega, Northern Dvina, Mezen, and Pechora has been analyzed in relation to the aggregate anthropogenic and regional natural characteristics. The results make it possible to reveal trends towards either a reduction or an increase in water pollution caused by the decrease in the wastewater discharge and changes in rivers water content under conditions of current changes in the climate of the northern European part of Russia.

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