Change of hydrochemical and hydrobiological regimes of water reservoir

¹ “Tashkent Institute of Irrigation and Agricultural Mechanization Engineers” National Research University, Tashkent, 100000, Uzbekistan
² Kazakh — German University, Pushkin str., 111, Almaty, 050010 Kazakhstan

^* Corresponding author: khaydarov.aziz@inbox.ru

Abstract

Particular attention in connection with the rational use of water resources is given to constructing reservoirs, studying their hydrobiological regime, and ensuring their reliable operation. This article evaluates reservoirs' hydrochemical and hydrobiological regimes and suggests preventing water degradation. The study was conducted on the case of the Shurtan reservoir in the northern part of the Kashkadarya region. The experiment's results showed that the openness coefficient of the Shurtan reservoir was equal to K=0.29, and since this indicator was less than 1 (K=0.29<1), the level of openness of the reservoir surface was considered low. Noteworthy, the influence of the landscape on the processes in the water reservoir was estimated based on the relative water discharge coefficient (Kwdc). In the case of the Shurtan reservoir, the coefficient of specific water discharge was Krwd= 5.99. Since this indicator was less than 10 (Krwd=5.99 < 10), the reservoir was included among water bodies with small specific water discharge Hydrobiological and morphometric indicators affecting the hydrochemical and hydrobiological regime of the reservoir have been determined. According to the change in the hydrochemical regime of the reservoir, the length of the Shortan reservoir bowl is Kel=2.62, and the water exchange coefficient in it is equal to 0.93 years, so the reservoir belongs to the II class. According to the data from 2007, 0.386 km² of the reservoir basin was covered with algae; by 2021, this indicator was 0.677 km².