Simulation of spreading of non-conservative passive substances in water bodies

Abstract

Numerical modeling has become an indispensable tool for solving various physical problems. In this context, two fundamentally different approaches to the derivation of equations describing the motion of a liquid and the transfer of both conservative and non-conservative substances that have or do not affect the flow structure. In addition to the classical approach, in which the hydrodynamic equations of the baroclinic fluid are obtained from the Reynolds equations by introducing the assumption that the turbulent viscosity between jets is neglected, there is another approach, which is to introduce a certain scale of consideration, as well as the use of hypotheses about the magnitude of turbulent viscosity and small changes of flow characteristics along with horizontal coordinates as compared with the changes along with vertical one. Thus, there is the option to obtain similar equations allowing to numerically simulating unsteady flows with fixed boundary conditions (fluctuating streams). Also, the article discusses an approach to numerical simulation of biogenic substances as well as the chemical and biological processes in reservoirs.

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].…”

A device for reducing the siltation of the front chamber of the pumping station in irrigation systems

“…Depending on the transporting capacity of the water supply facilities, the water velocity may decrease to a value less than the non-lagging value (this is mainly in the front chamber and water intake chambers), as a result of which suspended particles are deposited at the bottom of the structures. This leads to a change in the design dimensions of the forechamber, clogging of the water intake chambers, which negatively affects the operational parameters of the pumping units [5,[21][22][23][24][25][26][27][28][29][30][31][32][33][34].…”

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

“…The object of research in operation is the Amu-Bukhara machine canal (ABMC), in the area of the damless water intake from the Amudarya river bed. Sections of the ABMC machine canals, from the head structure to the ABMC-1 and ABMC-2 pumping stations, were taken as the object of hydraulic research [17][18][19][20][21].…”