Investigations on determination of changes in inactive volume of water reservoirs (case study of South Surkhan water reservoir)

The article develops the change of the reservoir’s useable volume under the effect of turbidity-sediments, considering the turbid discharges' hydrological regime into the reservoir, and proposes a computation technique. Field research was conducted in the South Surkhan reservoir. Based on the data collected from the field research, an electronic map of the reservoir bowl was made, and morphometric indicators were evaluated, considering the formation of muddy sediments in the reservoir. When the standard water level of the water reservoir is 415 meters, the designed water surface area is 65 km2, and the full volume is 800 mln. m3, and according to the results of field research, the full volume of the water reservoir at the level of the normal moisture level is 491.2 mln. m3, the water surface was 72.45 km2. It showed that the full volume of the reservoir was reduced by 38.6 percent compared to the design volume during the operation period, and the water surface area increased by 7.45 km2. The research results allow to determine the change in the useful volume of the reservoir under the influence of turbidity and sediments, to determine the morphometric indicators, and to use the water reserve effectively

Reservoir Overgrowth and its Relationship with Morphometry: Research Problem and Prospects for Uzbekistan

The article deals with the relationship between morphometry and hydrobiological regime. The Shurtan reservoir located in the southern part of the Republic of Uzbekistan is chosen as the Object of the study. Studying the problem of reservoir overgrowth and its connection with morphometry, especially in reservoirs with depth up to 2 metres, and the influence of sunlight penetration, requires application of various research methods. The water level mark in the reservoir during the period of field studies was ∇ 420.325 m, the reservoir water volume was 7.5 million m3 and the water surface area was 7.10 km2. On the basis of application of modern technologies of geoinformation system for assessment of hydrological and hydrobiological processes on the reservoir, an electronic map of the Shurtan reservoir basin was made. The results of the study using GIS technologies showed that the coastal zones of the reservoir bowl are covered with algae (reeds), their area is growing every year. If its area in 2007 was-0.386km2, in 2014 it reached an area of 0.677km2. In 2018, work was done to clear the coastal zones of vegetation, but by 2023 everything is covered with plants again

Change of hydrochemical and hydrobiological regimes of water reservoir

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

THE EFFECT OF ABNORMALLY COLD WEATHER ON LOCUST EGG PODS IN THE KASHKADARYA REGION OF UZBEKISTAN

Ushbu maqolada zararli chigirtkalarning kuzgi va bahorda tuxum ko‘zachalarining rivojlanishi, anomal sovuq havoning ta’siri hamda ularga qarshi kurash choralari va takliflari bo‘yicha ma’lumotlar bayon etilga

Estimating Determinative Factors Of Reservoir Sedimentation Processes

The article provides discussion about sediment transportation and its velocity, also main attention given to analyse of hydrometeorological parameters and sediment regime of The Surkhandarya River which main source of South Surkhan water reservoir. In this research we used materials from exploitation and field studies for the water reservoir of South Surkhan. Final estimations demonstrate that at the Shurchi hydrological station of the Surkhandarya River, the average sediment concentration is 2.02 g/l or 2 kg/m3. River sediments were determined in volume ratios and in masses. Module of erosion is 509 tons/km year the layer of erosion 0,443 mm/year erosion meter is equals to 2257 year

The evaporation loss from water reservoirs of Uzbekistan

The article deals with the results of the calculation of annual evaporation losses from the open water surfaces of reservoirs of Uzbekistan. For the estimations, we used the formula of the dependence of the temperature of open water surfaces of the reservoirs with the air temperature and average depth of them, and the tendency of air temperature change over time. The relationship between the wind speed above reservoirs and the weather station was defined

Change of hydrochemical and hydrobiological regimes of water reservoir

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