Significant climatic changes are currently observed in the Arctic zone of the Russian Federation, the intensity of which is 2.5 times higher than the average planetary level. The continental and shelf zones of the Arctic region of the Russian Federation contain a significant amount of minerals, including hydrocarbons. The cost of extracting this raw material on the mainland of the Russian Federation is becoming more expensive due to the depletion of existing deposits. In connection with this and the observed climatic changes, the Government of the Russian Federation has begun active development of this region. The development of the Arctic region is associated with the construction and reconstruction of port hydraulic structures included in the Northern Sea Route, the expansion of port infrastructure and the construction of terminals for liquefied natural gas. The current construction regulatory documentation of the Russian Federation does not provide for accounting for changes in wave, ice and hydrostatic loads on port hydraulic structures during their operation due to projected climatic changes in the region. The issue of the need to take into account climatic changes in the design of port hydraulic structures in the Arctic zone of the Russian Federation is considered. Conclusions are drawn that taking into account climatic changes will reduce the cost of major repairs during the life cycle of structures and reduce the risks of accidents caused by the operation of structures under design loads.

Keywords: climate change, construction projects in the Russian Arctic, port hydraulic structures, western Arctic

The article provides materials for research and assessment of the effect of reservoir hydro-systems on the environment. A detailed analysis of the causes and parameters of the influence of hydroelectric small hydropower stations on the hydrobtological resources of rivers. The results of the study and the assessment of the pollution level of the bottom sediments of the head node of the Kashkhatau HPP are given, which confirmed a slight excess of the permissible concentration level in terms of the content of cadmium and oil products. The main factors influencing the low-pressure reservoirs on the natural environment and on the restoration of fish river resources of small rivers are determined. According to the results of engineering and environmental studies, a comparative characteristic of soil pollution by oil products in relation to the permissible level was established, analyzing the results obtained, it was concluded that the content of oil products in the collected soil samples is within the established standards. A comprehensive assessment of pollution of water resources and soils of coastal water protection zones is given.

Keywords: reservoir waterworks, small hydropower plant, aquatic and biological resources, solid runoff, river pollution, flood waters, background concentrations, heavy metals, hydraulic structures

The paper describes the sele-dangerous zones of the North Caucasus and Kabardino-Balkaria. More detail marked selevye problems of the river Gerhozhansu - the most dangerous river in the regions of SK. The results of the descent of powerful mudflows along the gerhozhansu river in 2000-2017, which had disastrous consequences for the city of Tyrnyauz, are presented. Made a study of the results of years of research the authors conducted in mudflow dangerous rivers of the CBD. Based on field field field studies in the river basin. Gerhozhansu revealed a self-regulating natural mechanism that forms naturally when the mudflow converges the most suitable profile of the transit section of the channel, which ensures the passage of the maximum possible mudflow at minimum energy costs. According to the results of analytical studies of the causes of destruction and the reliability of the work of existing structures and saleprovides antimud slide protection facilities. Developed and proposed more efficient design and technological solutions in designing mud and saleprovides structures combined structures that are protected by patents for inventions and useful models. In conclusion, the main results of the research carried out in the work are noted.

Keywords: mudflow dangerous areas; debris flows; transit station; cone-removal; mud dam; saleprovides tray; conveying ability; antimud slide protection facilities; effective design

The article presents the analysis of causes of accident of a water tower. Conducted examination of the structure showed the following: Water tower made in the form of welded sheet construction. Steel tank has a cylindrical shape, the diameter of the tank is 3020мм, cylindrical pole with a diameter of 1220mm and a height of 18m. The walls of the tower are made of sheet metal with a thickness of 4 mm, welded together back to back. On the East side there is a steel staircase made of 50х50х4 area with safety fence, made from steel strip -40х4. The lower part of the support diked soil with a height of 2.5 m. The tower has four stretch marks from the steel rope Ø12mm. The main causes of the accident was the deviation from a typical project in the manufacture of structural tower.

Keywords: tower, project, design,resistance, load

The effectiveness of the use of superplasticizers of various chemical bases of the MC-Bauchemie Group: PowerFlow 7951, Muraplast FK 49 and Centrament N 10 was studied in concrete. The quantitative influence of the superplasticizer on the properties of cement binder and concrete was studied. Based on the obtained research results, we recommend the costs of additives for the production of heavy concrete.

Keywords: superplasticizer, polycarboxylate, lignosulfonate, naphthalene, heavy concrete, concrete strength, microstructure

The article contains material reflecting the prospects of development of hydrothermal resources formation waters of the Azov-Kuban artesian basin.

Keywords: hydrothermal energy, groundwater, methane gas saturation

In the article an accent is done on the problem of fightagainst erosive processes in the regions of North Caucasus. It is marked that earth of recreational zones is windero dedand broken by economic activity of man. And the ant erosion actions and constructions used at the same time are inefficient, need improvement andecologization. Mountain earth is most subject to water erosion, inconnection with the abundant sinking and flow of the meltedwaters. By results of researches erosive processes on slope lands develop more intensively. The substantiation of the need for more effective erosion control measures. Based on the conducted studies the authors have developed more efficient technical solutions to combat water erosion and restoration of disturbed lands. The most effective designs of ant erosion constructions, author's development are offered. Which was found constructive and technological decisions on construction of erosion control structures of food-grade, biodegradable design to restore the ravines and pits of erosion.

Keywords: erosive process, recreational zone, biopositiv product, antierosion construction, ravine, washout pit

The article presents the analysis and safety assessment of hydraulic structures in the upper-Balkar small hydroelectric power plant. This is done for a project for the suspension and preservation of hydraulic structures Verhnebakansky of a small hydropower plant on the river Cherek in Kabardino Balkar-Balkar Republic. A detailed analysis of causes and factors of external impact of natural and man-made disasters on structures. Determined that most dangerous mountain of the construction site are the physical and geological processes. Established that the level of safety of hydraulic structures Verhnebakansky Small hydropower plant at the time of the survey can be assessed as normal. The values of all controlled parameters do not exceed the established safety criteria. Developed and implemented design solutions for the period of the suspension of construction and the stage of preservation provide strength, stability and safety of structures. Object safe for people and the environment.

Keywords: hydraulic structure, small hydro power plant, free-flow diversion tunnel, a sump, diversion tray, physico-geological processes, risk assessment, hazard ratio, possible crash damage, quantification of risk, negligible risk

Discusses the calculation of a water tower Rozhnovskogo design, in the form of a welded sheet construction, structurally consisting of a tank of cylindrical shape with a conical bottom and a cylindrical roof and pillars. Performed creating finite element analysis model and the determination of the stresses in the tower elements with regard to the various features of the design, installation and operation of the facility. Discusses the local stability of the wall at the junction of cylindrical and conical parts. The necessity of the device the ribs in the conical part along the meridional direction and in the junction of annular ribs.

Keywords: Tower, leaf design, reservoir, resistance, voltage

We study the experience of the application of rotary aerators in modern wastewater treatment plants. Determine the type of effective cleaning systems. Shows the changes in the technology of rotary aerators are used in modern cleaning systems, in comparison with earlier samples. A comparison of treatment systems in the U.S., Canada and Egypt, applying the rotary aerators

Keywords: sewage treatment plants, aeration, construction of treatment systems

On the basis of dimension-regression method, experimental design, using Greco-Latin square, the authors have carried out theoretical studies of the filtration process through the channels facing damage, the formation of which is almost inevitable when the protective coating on top of the device impervious polymeric element. Using factors in dimensionless form, were constructed graphs depicting the results of the experiment, as well as to obtain an equation of the filtration coefficient lining, the adequacy of which is confirmed by the Fisher criterion.

Keywords: experiment planning, impervious lining, filtering, damage, Latin square, dimensionally-regression method

The article analyzes the impact of displacement that taking place at the mouth of the Don River. This leads to a weakening self-cleaning process of water and increasing concentrations of contaminants. The basic sources of pollution of waters of the river Don and the main types of anthropogenic impact on the aquatic ecosystem. Cases of accidents in factories and transport, violation of wastewater treatment technology, as well as simply by negligence.The necessity of the control of non-periodic oscillations of water bodies located on them intakes, to prevent loss of quality drinking water supply. The main influence of these displacement prone city like Azov, Aksay, Bataisk and Rostov-on-Don. The conclusion about the necessity and the possibility of monitoring the state of the river Don, the organization without expensive continuous observation system with an extensive list of hydro-ecological indices.

Keywords: River Don, displacement, heavy metals, sediments, aquatic ecosystems, water intake structures, hydrological post

In the article the basic problems of water reservoirs, their impact on the surrounding ecosystem. The advantages and disadvantages of the construction hydraulic structures. In particular, the example of the Tsimlyanskoe Reservoir. Identified the main tasks were solved and types negative impacts on the environment that appeared after construction of reservoir . The conclusion about the need to assess the environmental risks associated with the operation of the existing hydraulic structures modern methods and means of measurement. The formulas for the parameters of hydro-physical and hydro-chemical processes, such as hydraulic flow characteristics and reservoir temperature regime. The necessity of building an actual mathematical model for a series of computational experiments. Using the data obtained will allow for prediction of eutrophication processes in the Tsimlyanskoe reservoir.

Keywords: reservoir, hydraulic structures, ecology, hydrological processes, thermal pollution, eutrophication, mathematical modeling, numerical simulation, anthropogenic impact, drinking water supply, Tsimlyanskoe Reservoir.

Based on the theory of experiment planning using polurepliku five-factor experiment, conducted laboratory studies on the folder-diet tray obtained empirical relationship for determining the flow rate through the small holes in the polymer geomembrane. Performed to check the adequacy of the equation is obtained on the F-Fisher criterion, calculated significance of the knowledge-cheny consumption by Student t-test.

Keywords: geomembrane, impervious coating, flow, filtration, design of experiments

Due to the fact that currently seepage losses are significant, even with use of such geosynthetic materials like polymer geomembrane, evaluation of water permeability polymeric screens the presence of small lesions remains a major challenge. To simulate the filtration damage geosynthetic polymer screens use software package "Somsol multiphysics», allowing to solve both two-dimensional (plan) and three-dimensional (spatial) problem stationary and non-stationary filtration.

Keywords: water permeability, impervious screen, filtering, geosynthetics, geocomposites, geomembrane, modeling