ASSESSMENT OF THE LOAD OF NUTRIENTS AND POLLUTANTS ON THE RUSSIAN PART OF THE IRTYSH RIVER
S.A. KONDRATYEV1, A.Yu. BRYUKHANOV2, Sh.R. POZDNYAKOV3, A.V. PUZANOV4, I.V. ZHERELINA5, M.V. SHMAKOVA1, E.V. VASILYEV2, A.M. RASULOVA1, S.V. BABOSHKINA4, N.S. OBLOMKOVA2
1Institute of Limnology, Russian Academy of Sciences, St. Petersburg, Russia
2Institute of Agroengineering and Environmental Problems of Agricultural Production, St. Petersburg, Russia
3Russian State Hydrometeorological University, St. Petersburg, Russia
4Institute for Water and Environmental Problems, Siberian Branch, Russian Academy of Sciences, Barnaul, Russia
5LLC “Center for Engineering Technologies”, Barnaul, Russia
Keywords: nutrients, metals, external load, watercourse, transboundary transport
Abstract
To solve the problem of assessing the external load on the Russian part of the Irtysh River from the catchment, the ILLM model was used. It takes into account the contribution of point and diffuse sources to the formation of the load and makes it possible to calculate the removal of impurities from the catchment. The model takes into consideration the influence of hydrological factors and chemical retention by the catchment and its hydrographic network. In order to provide the model with the necessary input information, classification of the underlying surface types has been performed using PROBA-V and Sentinel-2 satellite images. Data on the content of nutrients (N and P) and trace elements (Cu and Zn) in soil and river waters of the studied territory were collected and analyzed. Based on the processing of materials on the activities of more than 800 agricultural enterprises, the number of livestock, and organic and mineral fertilizer inputs were estimated, and the total nitrogen and total phosphorus inputs to the hydrographic network were calculated. The external load (including the diffusive component) of nutrients (nitrogen and phosphorus) and metals (copper and zinc) was assessed for both the entire Russian part of the Irtysh basin and for seven of its sub-basins, including the Tobol, Ishim, Om and Konda rivers. According to the calculation results, the contribution of the transboundary load to the outflow of the considered chemicals in the outlet sections of the transboundary rivers was evaluated. It is shown that the ratio of the contribution of different components of the external load to the outflow varies depending on the water content of a year.
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