Calculation of the unsteady effect of reclamation drainage with in-depth consideration of the effect of the zone of aeration and infiltrations

Polyakov, V. L.

doi:10.15407/jha2018.01.053

Cited by 3 publications

(3 citation statements)

References 5 publications

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“…Therefore, for the calculations of local sewerage systems, it is possible to rely on the fundamental works on determining the optimal parameters of the operation of horizontal and vertical drains [1,10,11,13]. The principles of modelling drainage systems formulated by Polyakov [12], allow the development of reliable algorithms for drainage engineering calculations. The method of calculating water inflow to horizontal drainage proposed in [8] is quite simple and therefore attractive.…”

Section: зрошення -осушенняmentioning

confidence: 99%

“…However, despite the high level of existing methods for determining the main parameters of drainage and a large number of calculation options [7,8,[10][11][12][13], which is associated with significant variability of hydrogeological conditions and a large list of agricultural and technical tasks, there is a lack of rational approaches to calculation substantiation of the method of drainage of small built-up areas, where the arrangement of contour drainage is impossible. For this, in most cases, it is necessary to use the formulas for single drains, while the possibility of the existence of drainage in neighboring areas should be taken into account, which is mostly designed without taking into account the combined operation (superimposed action of the drainage).…”

Section: зрошення -осушенняmentioning

confidence: 99%

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Principles of Calculations and Arrangement of Local Drainage Systems in Private Building Territories

Shevchenko,

Streltsov

2023

LRaWM

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Abnormally heavy rains in the first two spring months of 2023 revealed the unpreparedness and lack of protection of many settlements in the Kyiv region from excessive moisture and inundation. Among them, is Novi Petrivtsi village, where the natural conditions for surface runoff and precipitation infiltration (lack of visible surface slopes and poorly permeable cover sediments) are unfavourable and significantly complicated by buildings, and a network of highways. The long-term retention of water on the surface, the rise of groundwater levels, and the layered structure of the upper part of the geological section provide grounds for the use of combined local drainage systems with compliance with drainage standards of at least 3,0 m. Since the high density of buildings often does not allow for contour drainage around residential buildings, it is necessary to lay single-line horizontal drainage to a greater depth than for a conventional contour drainage of 3,5 meters or more. However, the lack of roadside ditches and other water intakes and means of orderly drainage do not allow homestead drainage systems to work as efficiently as possible. This requires the creation of an orderly system of water intakes (trenches and closed collectors) on the scale of the village. Foreign experience convinces that the rational planning of such systems is possible under the conditions of establishing the character of rainfall distribution with a resolution of 1–5 minutes in time and a step of 500 m across the area. Meteorological radar is used to record radar images of rain and study its intensity. An effective solution to the water drainage problem is impossible without detailed engineering and geological investigations. Due to them, litho-facies inhomogeneities in the aeration zone and water-saturated stratum, which lead to the retention and support of groundwater, were discovered in the local area. Taking into account the spatial boundaries of these engineering and geological elements allow drainage more efficiently. Drainage capacity is substantiated by forecasts of changes in the maximum amount of precipitation per day and two days in a row. Due calculating the drainage capacity, it should be taken into account that the maximum amount of precipitation in the future period will have a guarantee of 0,5-2,0% less than the actual maximum values. In the calculation part, the main attention is paid to the selection of equations for determining the width of influence of a single horizontal drain. Five formulas have been selected that can be used to solve similar problems. The time of onset of the established mode of operation of a single drain was calculated. Future research should focus on the collection of high-resolution rainfall and local urban runoff data, as well as the implementation of urban drainage models.

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Section: зрошення -осушенняmentioning

confidence: 99%

Section: зрошення -осушенняmentioning

confidence: 99%

Principles of Calculations and Arrangement of Local Drainage Systems in Private Building Territories

Shevchenko,

Streltsov

2023

LRaWM

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“…Previously, we utilized substantially nonlinear soil hydraulic functions (unsaturated conductivity, soil-water retention) for all types of fi ne-grained mineral soils based on the modern classifi cation, conducting numerous numerical calculations. As a result, it was found that the intensity of water exchange between saturated and unsaturated zones depends primarily on the position of the WT and to a lesser extent on the speed of its movement [7,8]. Th is implies that it is legitimate to use the second approach in applications, requiring less initial data, simpler experimental techniques, and allowing the use of analytical methods.…”

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confidence: 99%

Theoretical substantiation of regular system of horizontal drains (a new approach)

Poliakov

2024

Dopov. Nac. akad. nauk Ukr.

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The nonlinear problem of regulating the water-physical conditions of over-drained and over-wetted agricultural lands through a regular system of horizontal drains has been formulated and solved by analytical methods. The dynamics of groundwater reserves are analyzed in a generalized manner, rather than locally as done previously. A dependence has been derived to describe the behavior of the water table averaged over the interdrain space, considering a targeted change in head within the drains. Based on this, a formula has been obtained for calculating the optimal drain spacing in both homogeneous and heterogeneous soils, taking into account the requirements for their water-physical state. An assessment was conducted on the uneven distribution of groundwater caused by the local action of horizontal drains. Examples with typical initial data illustrate the decrease in the average water table over time and demonstrate the potential for rarefaction of reclamation drainage using a new methodological approach. This approach will significantly reduce capital costs for its construction and reconstruction.

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Hydrodynamic model of the formation of horizontal drainage runoff on drainless and slightly drained irrigated lands in the dry steppe zone of Ukraine

Морозов

Kozlenko³

2021

LRaWM

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The article presents the results of the research, which are the basis of making a hydrodynamic model of the formation of drainage runoff of closed horizontal drainage on drainless and slightly drained irrigated lands in the dry steppe zone of Ukraine. The relevance of the research is in their need when designing the systems of horizontal drainage, determining drain spacing, modes of operation and the evaluation of drainage efficiency during its operation when irrigating with the use of modern sprinklers from a closed farm network. The objective of the research is to develop a generalized hydrodynamic model of formation of closed horizontal drainage runoff when irrigating from a closed farm network on drainless and slightly drained lands, which are typical for the watershed plains and coastal lowlands of the dry steppe zone of Ukraine. The task of the research to determine the basic conditions and factors of formation of horizontal drainage runoff, to specify the structure of groundwater inflow to the drains when having optimal drain spacing in the closed farm network and to define the prospects and areas of further research. Research methods and techniques: long-term (1975-2020) field experiments on drained areas with different drain spacing in typical hydrogeological conditions for watersheds and coastal lowlands; water balance studies; theoretical research methods (analysis and synthesis, comparison, generalization, zoning); to determine the structure of groundwater inflow to the drains, the method of electrohydrodynamic analogies when using the laboratory integrator EGDA 9/60 was applied. As a result of the research it was determined that in the conditions of a closed water farm network it is possible to increase drain spacing from 120-220 m to 240-400 m. When studying all the conditions of drainless and slightly drained watershed plains and coastal lowlands, the main sources forming the regime of groundwater and drainage runoff are the precipitation of 420 mm or 55.0% of water input, irrigation water - 340 mm or 45.0%, including 266 mm or 35,0% from irrigation and 75 mm or 10,0% from filtration from the canals. The analysis of the hydrodynamic model of drainage runoff formation shows that when having drain spacing as 240-400 m, the inflow from the zone located above the bottom of the drain is 2.6-4.8% of the total inflow to the drain. The ascending flow under the bottom of the drain enters it at an average angle of 600 and in all variants of drain spacing is 95.2-97.2% of the total inflow. When drain spacing increases from 240 to 300-400 m, the horizontal inflow from the area located below the bottom of the drain decreases with a corresponding increase in the ascending flow under the bottom of the drain. The average width of the ascending flow to the drain at the edge of the active zone of groundwater (9.0-10.0 m below the drain) is 13.0-20.0 m. The resulting model complements the existing theoretical and methodological knowledge base for designing horizontal drainage and is necessary in perspective researches on the formation of expert systems for optimization of the parameters and modes of irrigation and drainage functioning when applying modern broadcast sprinkler equipment irrigating from the closed farm network.

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Calculation of the unsteady effect of reclamation drainage with in-depth consideration of the effect of the zone of aeration and infiltrations

Cited by 3 publications

References 5 publications

Principles of Calculations and Arrangement of Local Drainage Systems in Private Building Territories

Principles of Calculations and Arrangement of Local Drainage Systems in Private Building Territories

Theoretical substantiation of regular system of horizontal drains (a new approach)

Hydrodynamic model of the formation of horizontal drainage runoff on drainless and slightly drained irrigated lands in the dry steppe zone of Ukraine

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