Assessment of Chimkurgan water reservoir sedimentation processes

Abstract

Uzbekistan is an inland country with very dry summers and cold winters. The main course of the economy is agriculture. There are two basic kinds of agriculture in terms of irrigation: rainfed and artificial irrigation systems. Therefore, in long dry summers it is reasonable to build water reservoirs to keep enough water resources for vegetation period. Because of sedimentation transport water reservoirs sometimes quickly filled with sediment. Estimating the effects of potential sediment accumulation in reservoirs is an important element in the planning of the dam project. Sediment accumulation in a reservoir may reduce the useful storage of water in this reservoir, change the water quality near the dam, increase flooding level upstream of the dam due to sediment aggradation, influence the stability of the stream downstream of the dam, affect stream ecology in the dam region, etc. This article provides a correlation between the reservoir volume reduction from the bottom to a given level, based on the amount of water flowing into the Chimkurgan reservoir and the river basin monitoring data. Based on the results of observations and calculations, the current state of the reservoir was formed on the basis of GIS tools. In the first step we constructed a flow duration curve, which is the cumulative distribution curve of the stream runoff passing the dam.

Assessment shoreline formation of reservoirs

“…Results of coastal deformation bring to formation of a mobile mass, and those mass effects of reducing the volume of the reservoir and brings to rise of the reservoir water. [1,2,7,11].…”

The method of hydraulic flushing calculation of the reservoir of the "Indian type" hydrosystem

“…Sobolin, M. Radoan, L. Matchavariani, S. Bennett, etc. [1,2,3,4,5,7,20,21] Under operating conditions, engineers are required to quickly calculate the leaching and silting of the headwater without particularly complex computational and graphic works to at least approximately establish the duration and length of the leaching propagation to remove a given volume of sediment. The most well-known and frequently used methods, especially hydrodynamic methods (methods of I. I.…”

“…Siltation of reservoirs during operation is caused by sedimentation in its bowl of sediments coming from the catchment area along with liquid runoff [1][2][3][4][5][6][7][8]. Siltation of upstream reservoirs leads to a decrease in the useful capacity and contributes to sediment flow into the flow paths of hydropower facilities [2], ]6-10].…”

“…Under such conditions, the organization of rational leaching of the headwater is of paramount importance. [4,5,7,8,9,10,14] The department "Use of water energy and pumping stations" of the Tashkent Institute of Irrigation and Agricultural Mechanization Engineers purposefully deals with the issues of improving the efficiency of operation of hydraulic structures and equipment of hydropower facilities (pumping stations and hydroelectric power plants) [15,16,17,18,19]. This article proposes a method for calculating the duration of washing the headwater of Indian-type hydrosystems to improve the conditions for water intake into the supply channels of the hydroelectric power station.…”

Infrastructure mapping and performance assessment of irrigation system using GIS and remote sensing

“…Geometrically rectified multi-date satellite data can be sequentially analyzed with a *Corresponding author: jasur12321@gmail.com maximum likelihood classifier algorithm supported with ground truth collected during a field visit. Satellite-based GPS provides accurate geo-referenced (in terms of latitude, longitude & altitude) position on the ground [6][7][8][9][10][11][12][13][14].…”