Name
Tkachev Aleksandr Aleksandrovich
Scholastic degree
•
Academic rank
associated professor
Honorary rank
—
Organization, job position
Novocherkassk Engineering Meliorative Institute named after A.K. Kortunov
Web site url
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Articles count: 3
In this article we consider the method of hydraulic
calculation of dead-end channels with the numerical
solutions of differential equations of motion of water.
Dead-end channels are of interest for carrying out
simulation studies, because they may be used for the
simulation of water accounting and water distribution
in the domestic inter-farm network. In order to
improve management of water supply to consumers in
the water distribution sites, in many irrigation systems
there is an additional capacity in the form of a
regulation pool. The applied method of active control
of light distribution is expected to use the existing
capacity of irrigation canals with automatic regulators
to block the plants. When there is a complete
disconnection of water consumers, the volumes in
pools of water irrigation channel are redistributed to
provide the command area in the water distribution
nodes at any given time. This result can be achieved by
automatic control of the level changes in individual
pools of the channel in order to redistribute the
volumes to backup pools of individual. Search and
selection of the necessary rule of automatic controls
can achieve the following objectives: to implement
effective processes and management of water supply
regulation in the specified node; maximize the use of
volume tail water channels, preventing the threat of
overflow channels; minimize the loss of irrigation
water discharge
The purpose of the article is to develop methods for hydraulic design of extreme discharges and water depths in critical gage lines of waterways diverting water from spillways for the accepted law to regulate linearly distributed releases of stored water discharges. The task of control for linearly distributed releases of stored water discharges is based on hydraulic design for the process of propagation and transformation of long waves described with Saint Venant equations. These equations are nonlinear and have no accurate solution in general case. To get approximate solutions they are linearized. It is established that the task of integration for these equations supposes to get their preliminary solution in the form of complete integral. Applying the complete integral theory we get analytical solution that describe the process of transformation for one direction waves moving in infinitely long prism canal of semi-bounded extent with initial uniform regime of water flow. An example of changes in both water discharge and flow depths in two fixed downstream gage lines of hydraulic works at the distance of 5000 and 10000 m from the initial gage line is presented. Hydraulic design was carried out according to the derived analytical formulas accepted as an example classical method of characteristics that is considered as analogous. Comparison of the design results on two methods allowed to determine the maximum relative error that does not exceeds 3,5 % for the design discharges and water depths. Introduction of the developed method for hydraulic design of linearly distributed releases of discharges in waterways diverting water from spillways will make it possible to optimize idle and non-technological stored water discharges
The article considers the mathematical task of calculating
the transient flow of water in the regulation of
concentrated releases of water discharges on stream flows
in lower tails of spillway waterworks. An algorithm,
analytical solutions based on hydraulic calculations of the
process of propagation and transformation of long waves
described by Saint-Venant equations are constituted.
These equations are nonlinear and have no exact
solutions. To obtain approximate solutions these
equations are linearized. The efficiency of spillways
depends on how accurately hydraulic processes
characteristics are measured. Control and direct
measurement of characteristics of hydraulic processes in
natural conditions is difficult, which requires applying
methods of mathematical modeling and simulation
studies of transient processes, which are based on the
algorithms of functioning of transient hydraulic processes
control. Introduction of the developed method for
hydraulic calculation of discharge releases to streams, diverting the water from water discharge structures,
allows optimize idle and non-technological discharges of
water from reservoirs. Considering the highly dynamic
nature of the water flow in the lower tails of the dams at
concentrated releases of water discharges from reservoirs,
development of new methods of hydraulic calculation of
extreme discharges and water depths at the critical
sections of watercourses with transient regime of water
flow is an important task