Change of the useful volume of the South Surkhan reservoir under the influence of sedimentation

Water and mudflow reservoirs are built worldwide for the efficient use of water resources and the regulation of river flow, and special importance is attached to their safe and effective use, the operational reliability of structures and the extension of their service life. In this article, the change of the active volume of a reservoir under the influence of turbidity and sedimentation is examined, taking into account the hydrological regime of the turbid discharges entering the reservoir, and a method of calculation is proposed. Field research was conducted at the South Surkhan reservoir (Surkhandarya region, Uzbekistan). Based on the data collected, a digital elevation model of the reservoir bowl was created and morphometric indicators were evaluated together with the formation of muddy sediments. At a water level of 415 m above sea level the design water surface area is 65 km 2 and the full volume 800 million m 3 , whereas the field research gives a full volume of 491.2 million m 3 and a water surface of 72.45 km 2 , that is, a decrease of the full volume by 38.6 percent and an increase of the water surface area by 7.45 km 2 .

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