Computer simulation of channel processes

Abstract

The article discusses the results of numerical studies of flow movement with a sharp change in the channel parameters. The numerical study of the flow in the channels and rivers creates the possibility of a multivariate forecast of channel processes, rivers, and requires minimal expenditures. The purpose of the study is to determine the main objectives and directions of research in the area under consideration. A mathematical model and a computer program have been developed that allow solving a wide range of tasks for modelling currents in the channels of various difficulties, taking into account daily regulation. This makes it possible to identify and proactively take measures, such as: determining the time to reach the flow along the channel; the establishment of water volume flow in an arbitrary channel; taking emergency measures to regulate the incoming residual volume of water after its termination into the system, in the event of an accident at pumping stations; identification of the nature and direction of channel processes; prevention of undermining of supports and damage to power lines passing through the channel, and many other engineering tasks. The developed tested mathematical model allows in real conditions and in real time to help the operational services of large channels in the operational management of actions, in emergency situations, and the choice of the most effective, at any point in time, measures to minimize the consequences. Analysis of the results of many researchers has created the opportunity for the authors of this article to conclude that the above system of hydrodynamic equations is applicable in mathematical modelling of motion, taking into account the transverse circulation of the flow.

Hydraulic resistances experimental and field studies of supply canals and pumping stations structures

“…At the same time, the geometric dimensions of the experimental canal were recalculated based on the parameters of a real object, taking into account the scale of modeling. Based on experimental studies of the distribution of vertical velocities of the water flow, as well as field data of machine canals ABMС (water consumption in ABMC -1 = 75 3/ and ABMC-2 is = 150 3/ ) in nature, the water speed on the machine canal is quite high and is equal to (=3÷4,5 m/s), the obtained materials of experimental and natural conditions gave similar results [30][31].…”

Irrigation sedimentation tanks in the bed of the pumping station inlet channels

“… Average weighted hydraulic sediment size � � � 0.00706 �/�.  The granulometric composition of sediments entering the channel was adopted according to the recommendations [12].…”

“…To ensure a guaranteed volume of water with a minimum volume of bottom and suspended sediments is considered an urgent task. The dynamics of the hydraulic and alluvial flow regimes in the bed of the pumping station inlet channels were studied in [7][8][9][10][11][12][13][14][15]. Sediments occur due to the hydrodynamic effect of the flow on the stand plate in the presence of cavitation, eroding water flow rate in the channels, and dynamic instability of large soil channels with wind waves [16][17][18].…”

Achieving reliability and energy savings in operate of pumping stations

“…To improve the safety and sustainable operation of РS, it is recommended to: develop regulatory documents that determine the properties of water, which do not lead to wear of equipment and destruction of materials; a methodology for a comprehensive assessment of the degree of risk from the impact of a resource of inappropriate quality during the operation of the РS [26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41][42][43].…”