FEATURES OF INTRADAY FLUCTUATIONS IN WATER QUALITY INDICATORS OBSERVED IN THE KAMA RESERVOIR

Abstract

To solve a wide range of problems related to the protection and rational use of water bodies, it is fundamentallyimportant to assess fluctuations in the variability of indicators of their chemical composition. In this case, as a rule, seasonal and monthly fluctuations are considered and analyzed. This is due, most of all, to the features of the current monitoring system. The transition to automated measurement systems makes it possible to study and analyze much shorter-period processes, such as inter- andintra-day fluctuations.Currently, these fluctuations in water quality indicators in reservoirs are an insufficiently studied phenomenon, although theyplay an important role both in shaping the consumer properties of water and ensuring the environmental safety of water bodies. Thesefluctuations are especially relevant for water bodies located in zones of active technogenesis, which are the most important sources ofwater supply for the largest industrial complexes.The article examines the processes recorded in two sections of the Kama Reservoir: the lower one, directly adjacent to theKama Hydroelectric Power Station, and the upper one, located in the zone of pinching out of its backwater. In the lower section, thequality of water taken in winter is characterized by pronounced inter- and intra-day fluctuations caused by significant changes in waterdischarge rates in the lower pool. At the same time, in the upper section of the reservoir, located in the zone of backwater wedging out,these fluctuations are observed in the warm period, during the formation of vertical stratification of water masses. These phenomenaoccur with a significant decrease in the slopes of the water surface and, accordingly, a decrease in current speeds.