Journal articles on the topic 'Hydraulic lock structures'

For hydraulic structures of long-term operation, assessments of operating life, limit states and safety of structures are required. The design of reconstruction, restoration of functional parameters of structures is preceded by pre-design inspections of the structure. The relevance of pre-design inspections is the need to assess the characteristics of technical and operating state of the structure, to describe reasons for deviations from design parameters of operation, to obtain recommendations to justify the design of reconstruction, restoration or repair of structures. This article presents the results of a pre-design inspection of a high-pressure lock on the Ufa River. An analysis of the complex of effects on the stress-strain state of the structure, static calculation of the lock chamber wall is carried out considering design changes during the operation period – installation of additional buttresses, vibrodynamic inspection and calculation. The obtained calculation results are compared with data of instrumentation equipment. The purpose of the inspection is to obtain a preliminary design assessment of technical state of the hydraulic structure – lock, including an assessment of the possibility of further operation. The practical significance of the paper is determined by the fact that the results obtained can serve as baseline data for a design of reconstruction, restoration of a hydraulic structure and recommendations for ensuring its long-term safe operation.

Combined effects of several complex phenomena cause the deterioration of elements of steel hydraulic structures on the nation’s lock systems: loss of protective systems, corrosion, cracking and fatigue, impacts, and overloads. This paper presents examples of deterioration of steel hydraulic structures. A method for predicting future deterioration based on current conditions is also presented. This paper also includes a procedure for developing deterioration curves when condition state data is available.

Peculiarities of structures of hydro technical structures technical condition are considered. The problem concerning normative documentation on the inspection of hydraulic structures is considered, and the absence of standards for the inspection of this type structures is revealed. The issue of hydraulic structures inspection by the example of a three-chamber lockin Zaporizhzhia city is considered. The issue of the deformed state according to observations of past years are considered. The recommendations for the further exploitation, repair and completion of reconstruction of a three-chamber lockin Zaporizhzhia are given.

Lock-exchange flows driven by density differences in non-rectangular cross-section channels are investigated in situations that resemble estuaries, navigation canals and hydraulic engineering structures. A simple analytical model considering stratified flows suggests practical relationships corroborated by results of laboratory experiments carried out in a straight channel of triangular cross-section.

Abstract The settlement and its calculations and monitoring are among the main factors influencing the structure and operability of hydraulic structures. Our paper focuses on the hydraulic structure Gabcíkovo which consists of the hydropower plant with an installed capacity of 720 MW and two navigation locks to ensure international ship transportation. Conventional geodetic methods of classical or very precise leveling with state-of-the-art measuring instruments are currently used to monitor deformations on navigation locks of hydraulic structure Gabcíkovo. In their subsoil, there are gravelly sediments to a depth of about 400 m. Under the gravel sediments, there are Neogene clays and silts. From the beginning of construction, deformations are measured on all structures using special tachymetric devices to monitor the elastic displacements. The obtained measured values are then processed in time dependences and compared with the limit values. During the current almost 30-year operation of the navigation locks, filling and emptying cycles, loading and unloading of the subsoil can be counted in the tens of thousands. The impact of the long-term operation, but especially the current innovation and modernization of navigation locks, aimed at increasing the safety and intensity of transport brings new knowledge and experiences. During the implementation of required improvement related to this project, the right navigation lock is empty for more than a year. The created technical conditions made it possible to monitor the influence of long-term unloading on the subsoil on the vertical displacements in detail. This unusual load condition is a motivation to present the results of measurements in the presented paper.

The basis of the enterprise “Moscow Canal” in its present state is the canal Moscow - Volga constructed in 1937. Today “Moscow Canal” is the biggest water transport and water industry complex. It has 10 filiations and solves a substantial complex of tasks. One of the most important part of hydraulic structures operation is their observation or monitoring of their safety, which gives us timely and adequate picture of their work and helps to forecast and prevent emergency situations.The article is devoted to the development of the monitoring system of the water- works of the Moscow canal beginning with the moment of its construction to the present time, the observation analysis of the condition of the walls of canal locks chambers, lock no. 2 where destructive processes in the operation of the walls were first discovered and different methods of liquidation of their development were made. The main problems in the field of monitoring of hydrotechnical structures of the Moscow canal are identified basing on the analysis of the observations.

Large structures weighing systemis upgrading the structure simultaneously using several jacks. After structure leaves the ground, the hydraulic control check valve is used for hydraulic lock, and pressure sensor that under each jack measures the jack cavity pressure. Data is collected by PLC system to obtain the force situation of each jack. With the moment of inertia calculation, center of gravity coordinates of the plane is obtained, the weighing system involves in the hydraulic system, control system, data acquisition and transmission. As the jack wall friction and the leakage factors, in the measuring process, pressure sensor reflects little, and measurement errors appear. In this research, experimental research data has been used to obtain empirical formula under varying pressures, error has also been corrected in weighing measurement system in order to get high precision weighing data. The results are in good agreement after comparing this theory with results measured by weight sensor.

Over time, the uneven settlements of the structure and foundation are prominent in constructing ship lock heads on soft soil. These deformations endanger the safety of ship lock heads during construction. This research aimed to establish the ship lock head’s structural optimization procedure on soft soil, considering the time-varying effects of the structure and foundation. By comprehensively considering the linear viscoelastic creep of concrete and the elastoplastic consolidation characteristic of soft soil, a perfect time-dependent analysis method for the lock head on soft soil was proposed. Furthermore, a hybrid particle swarm optimization, enhanced whale optimization, and differential evolution (PSO-EWOA-DE) algorithm was proposed to optimize thirty-four design variables of a lock head. With the minimal volume of the lock head as the optimization objective, the finite element model was established. In the optimization process, three types of constraints were evaluated. The result showed that the optimized design could reduce 10.45% of structure volume. Through comparing and analysing the maximum principle stresses and vertical displacements of the lock head before and after optimization, some conclusions were drawn. The optimization procedure proposed in this paper provides a new perspective for the structural optimization of hydraulic structures on soft soil.

The basic idea of the Main Outfall Drain, MOD, was to construct a main channel to collect saline drained water of the irrigation projects within central and southern parts of Iraq and discharge it down to the Arabian Gulf. The MOD has a navigation lock structures near Addalmage Lake at station 299.4km. This structure is designed to ensure navigation within the MOD. The water level difference upstream the cross regulator and the downstream conjugation structure is about 9m. This head difference can be used to generate electrical power by constricting a low head power plant. This study aimed to utilize the head difference in navigation lock structures for power generation. Different operation condition and locations plants were examined. Hydrologic and hydraulic simulations were used to analyze the system of the MOD-Addalmage Lake system. Results showed that the water level are kept below the dike level along the reaches in the all alternatives and the maximum average annual power generated vary between 3.41MW to 5.55MW depending on the selected alternative of operation and the site of the plant

The field of repair of submerged hydraulic structures (dams, stilling basins, lock chambers, and so forth) is becoming more and more important given the economic worth of such structures. Damage caused by abrasion can make it difficult to maintain such structures in service. The purpose of the study described in this paper was to develop durable high-performance concretes that can be used for manufacture of board for repair of abrasion-damaged surfaces. The board might also be placed on surfaces already repaired with colloidal concrete poured underwater. Two types of cement (Type 30 and Type 10) and two high-performance coarse aggregates (granite and dolomitic limestone) were used. The eight concrete mixes developed included a variety of additives and admixtures such as silica fume, steel fibre, latex, and superplasticizer. For precise characterization of the mixes, hydraulic abrasion tests, compressive strength tests, and freeze–thaw cycle resistance tests were performed. In addition, shrinkage, thermal expansion coefficient, and permeability of the concretes were measured; in some cases, the board might be subject to freeze–thaw cycles in structures partially emptied for repair or maintenance. Results show that high-performance concretes with very low water: cement ratio, good workability, and improved freeze–thaw cycle resistance can be manufactured. Concretes made with Type-30 cement, silica fume, and granite or limestone aggregate offer excellent hydraulic abrasion resistance (depth of erosion on the order of 1 mm after 72 h), compressive strength greater than 115 MPa after 91 days, and a freeze–thaw durability factor of more than 100%. Key words: abrasion, concrete, durability, steel fibre, silica fume, freeze–thaw cycle, latex, board, underwater repair.

Abstract Gravity currents are important in many fields, including the estuarine sciences, meteorology and hydraulic engineering. The NHWAVE (non-hydrostatic wave) model was applied to simulate the detailed interface structure between a lock-release gravity current and the ambient fluid. The simulated structures, including the front height, front position and velocity of the current, are consistent with the results of laboratory experiments. However, the internal structure of the current is different from that revealed by previous research. The Kelvin–Helmholtz phenomenon in the interface and the interface vortices were successfully captured by the NHWAVE model. The difference in velocity between the front and rear vortices leads to entrainment, further causing changes in the shapes and amount of vortices. Flow field results obtained by the NHWAVE model reveal the existence of a significant circular flow, as well as some small eddies within it. The significant circular flow supports the forward movement of the current, whereas the small eddies reflect interface vortices. In contrast, hydrostatic simulation with the same model settings fails to capture the vortices. This research shows that the NHWAVE model performs better than a hydrostatic model when simulating the Kelvin–Helmholtz instability phenomenon and vortex entrainment in a lock-release gravity current.

n event of mating between specimens of Corizus hyoscyami and Rhopalus parumpunctatus, registered in the Novgorod Province of Russia is considered. The structure of the aedeagi in their completely inflated state and the female genitalia, as well as the functioning of the genitalia, are described and illustrated. The process of unfolding and swelling of the aedeagi is traced using the method of hydraulic inflation of the membranous parts with glass microcapillaries. The congruence of the genitalia is discussed for each species, and also for the interspecific crosses in both combinations of sexes and species. Structures of insect terminalia are divided into three groups according to their functions: 1) auxiliary structures; 2) structures providing the mutual fixation of the genitalia; and 3) structures directly performing the function of transferring seminal fluid. It is shown that in the considered variants of interspecific crosses, the parts of the genitalia belonging to the second group have almost the same structure and functioning, and most likely cannot perform the function of structural isolation. The structures of the third group have taxon-specific morphological and functioning traits and a high degree of congruence within each species. Schemes of the functioning of the genitalia in interspecific crosses, speculatively showing the impossibility of normal insemination, are proposed.

Purpose The combined effects of several complex phenomena cause the deterioration of elements in steel hydraulic structures (SHSs) within the US lock system: corrosion, cracking and fatigue, impact and overloads. Predicting the future condition state of these structures by the use of current condition state inspection data can be achieved through the probabilistic chain deterioration model. The purpose of this study is to derive the transition probability matrix using final elements modeling of a miter gate. Design/methodology/approach If predicted accurately, this information would yield benefits in determining the need for rehabilitation or replacement of SHS. However, because of the complexity and difficulties on obtaining sufficient inspection data, there is a lack of available condition states needed to formulate proper transition probability matrices for each deterioration case. Findings This study focuses on using a three-dimensional explicit finite element analysis (FEM) of a miter gate that has been fully validated with experimental data to derive the transition probability matrix when the loss of flexural capacity in a corroded member is simulated. Practical implications New methodology using computational mechanics to derive the transition probability matrices of navigation steel structures has been presented. Originality/value The difficulty of deriving the transition probability matrix to perform a Markovian analysis increases when limited amount of inspection data is available. The used state of practice FEM to derive the transition probability matrix is not just necessary but also essential when the need for proper maintenance is required but limited amount of the condition of the structural system is unknown.

Corrugated steel pipe suppliers have recently switched from annular rivetted corrugated pipe to helical lock seam corrugated pipe. This was done as a manufacturing expedient, but there has been an unexpected benefit in terms of reduced hydraulic resistance. Studies on full scale pipes have shown that the friction factor for full flow is lowered substantially as the helix angle of the corrugations is reduced. In fact at a helix angle of 52.5 ° the pipe resistance was found to be almost as low as for smooth pipe. However, these tests were concerned exclusively with determining rates of head loss for fully established flow. Drainage culverts for highways, grid roads, and farm crossings are usually relatively short structures. In some cases the length to diameter ratio may be as low as 10, and in most cases would not exceed 50. This immediately introduces the question of the length of culvert required to develop fully established helical flow, because before the flow becomes established the rate of head loss will be greater. In effect the friction factor will be highest at the culvert inlet and decrease along the length of the culvert, becoming a minimum after the flow is fully established. In theory the accumulated loss could be calculated by using a variable friction factor over the establishment length. This would be cumbersome and impractical. It would be simpler to calculate the pipe friction on the assumption that it is constant, at the minimum value, for the whole length of the pipe and then add a "development head loss" term to account for the extra loss. Experiments to determine the development head loss were conducted at the Hydraulics Laboratory, Department of Civil Engineering, University of Saskatchewan. The model pipes were 107 mm inside diameter and 2.13 m long. Standard corrugations were simulated and helix angles of 61.0 and 71.4° were tested. It was found that about 12 diameters of pipe length were required to obtain fully established flow, and a value for the development head loss of 0.2 times the velocity head was indicated. Key words: helical corrugated pipe, head losses, n values, flow establishment.

In July 1987, a section of the southwest wall of Sault Ste. Marie Lock failed during a locking operation when a portion of limestone facing, 60 m by 8 m, separated from the rubble backing wall. Engineering investigations resulted in the selection of the Recreational Lock Option, involving either downsizing the lock chamber within the existing lock or constructing a new lock as the most viable solutions. A Dry Dock Option, where the lock would be used to store craft during the winter months, was also considered. However, this option was abandoned during the course of testing. The engineering investigations also revealed that the emergency swing dam, constructed upstream of the existing lock to protect the system should the lock gates be damaged or carried away (as happened in 1909), was in poor condition and required rehabilitation in the order of over $0.5 million. A stop log emergency system was proposed as an alternative safety device designed to stop the flow of water through the canal in the event of gate failure. Physical hydraulic model studies were carried out to evaluate the feasibility of using an emergency stop log system. The tests showed that stop logs constructed with solid horizontal web plates top and bottom result in unacceptably high hydraulic downpull forces. Open truss stop logs can be deployed to stop the flow of water through the canal in the event of gate failure. The follower should also be constructed as an open truss such that the areas of steel exposed to the flow at the top and bottom of the follower are minimized. Hydraulic uplift forces that could prevent closure can be reduced by increasing the space between the stop log and the follower. Physical hydraulic model studies of the lock filling-emptying systems are described. The first and preferred option consists of downsizing the existing lock and retaining part of the existing wooden culverts and emptying system, if possible. A new filling port, filling valves, and supply culvert would be constructed upstream. In the event that the existing wooden culverts are found to be unserviceable, a second option was considered. This second option would be to fill in the wooden culverts and then construct a new filling port, filling valves, and supply culvert that would discharge into the lock through the upstream breast wall just above floor level. The existing emptying system would be retained or rebuilt. The third option, if both the filling and discharge culverts have to be condemned, would be to build a new lock. The results of the hydraulic model studies carried out to explore these three options are described.Key words: emergency closure, stop logs, follower, canal, lock, downpull, uplift, crane capacity, filling-emptying system, culverts.

Vertical slender hydraulic structures such as sluices, navigation locks, or storm-surge barriers are often dynamically loaded by waves. For a safe and economic design, an accurate description of the wave loads is needed. A widely used formula for this purpose is the Goda–Takahashi wave load formula (GT). It was derived for the assessment of gravity-based caisson breakwaters. Due to its many advantages, the formula is also often employed for the assessment of vertical slender hydraulic structures, although its applicability to those type of structures was never fully demonstrated. This study provides insights in the applicability of GT for vertical slender hydraulic structures. This is done based on a literature review on the historical backgrounds of GT, and an investigation of several case-studies. In the case-studies, the equivalent-static wave loads for caisson breakwaters in scope of GT are compared with those for vertical slender hydraulic structures. The results show that GT can safely be applied for vertical slender hydraulic structures loaded by pulsating wave loads, but that systematic over- or under-estimations are expected for breaking or impact wave loads. For individual cases, differences up to 200% were obtained. These large over- or under-estimations underline the need for an improvement of the current design tools for vertical slender hydraulic structures loaded by breaking or impact wave loads.

In Germany hydraulic structures like weirs or locks under the responsibility of the Federal Min-istry of Transport and Digital Infrastructure have an average age of about 80 years. They often show static characteristics, such as construction methods or very large cross sections that are no longer common practice today. When retrofittings are planned new calculations to verify its conformity with stability requirements become necessary. As no adapted regulations have been released for re-assessing the statics of existing solid hydraulic structures a Code of practice has been developed. Compressive and tensile strength derived from concrete cores are decisive input parameters for the calculations. During the last decades concrete cores of more than hundred existing hydraulic structures have been examined by the Federal Waterways Engineering and Research Institute (BAW). These investigations were analysed comprehensively concerning the variation of strength properties and the correlation between compressive and tensile strength in massive hydraulic structures. Furthermore given correlations and factors in technical guidelines which were usually derived by investigations on lab specimen at an age of 28 days were verified concerning their applicability on in situ concrete of old, massive structures. The findings are presented in the paper.

To accelerate the integration of fluctuating renewable energy technologies in the power systems, it is necessary to increase the flexibility of hydropower by operating turbines at off-design conditions. Unfortunately, this strategy causes deleterious flow phenomena such as von Kármán’s vortices at the wake of the vanes and/or blades. When their shedding frequency lies in the vicinity of a structure’s natural frequency, lock-in occurs and vibration amplitudes increase significantly. Moreover, if cavitation occurs at the centers of these vortices, the structure’s dynamic response will be modified. In order to understand this interaction and to avoid its negative consequences, the vibration behavior of a NACA 0009 hydrofoil under a torsional lock-in condition was numerically simulated for cavitation-free and cavitating-flow conditions. The results showed that the presence of vortex cavitation modified the formation and growth process of shed von Kármán vortices in the near-wake region which, in turn, caused an increase of the work performed by the hydrofoil deformation on the surrounding flow and a sharp decrease of the maximum vibration amplitude under resonance conditions.

According to design ideas of the frame of the 170 tons dump truck, and allaying effects on the frame carling from the lift oil cylinder support (LOCS), the lift oil cylinder support of float support structure (LOCSFSS) is designed by optimization technology. Then, hydraulic pressure lifting system is emulated by one-dimensional emulation, and the load curve is gotten during lifting. Based on the load curve, LOCSFSS and the frame carling are all analyzed by explicit dynamics. Afterward, contrasts and analysis are done among float support structure and the other two traditional structures of jointing on bottom steel board structure (JBSBS) and carling structure (CS). Results of that indicate LOCSFSS is obviously better than the other two structures.

The article provides the results of computational studies of the stress-strain state of reinforced concrete structures chambers of locks No. 15 and No. 16 of the Gorodetsky complex of hydraulic structures, performed on the basis of a finite element model taking into account the data of long-term monitoring and field surveys. Combinations of loads that are pleasant in computational studies correspond to the most unfavorable operating conditions. The applied finite element models take into account the structural features of the structure, including interlocking construction joints and the actual location of the reinforcement. In the computational studies, the load-bearing capacity of the actual anchoring of the new repair concrete and the concrete of the main array was checked; the distribution of vertical stresses in the chamber walls, in the reinforcement of the chamber wall, the values of the main stresses in the concrete block under the construction joint was obtained. Conclusions are drawn about the values of horizontal displacements of the upper parts of the chamber walls, cracking in the walls, and the need for reliable anchoring of new repair concrete to the concrete of the main array.

Abstract The water hammer (WH) phenomenon is one of the most dangerous phenomena in hydraulic systems, especially pipelines, gates, and locks on these lines. There are many analytical solutions to deal with the WH phenomenon, including the treatment of friction losses, but most solutions use linear arithmetic operations, which depart from the actual situation of the WH phenomenon. Also, the methods currently used are most challenging and complex and give imprecise results to treat the mentioned phenomenon. In order to reach a state closer to the situation of losses and stability of the hydraulic system that is close to the actual state, basic partial differential equations were used, taking into account the losses generated in the hydraulic system through mathematical conversion. MATLAB was used to program and solve equations, find mathematical results, draw system diagrams, and simulate a WH wave. Various parameters were investigated to show the stability behavior of the hydraulic system by using state-space Method. So, the effect of the pressure, flow rate, diameter, and fluid type were investigated to calculate the stability of the hydraulic system. The results evaluated showed that the system’s oscillation is less at lower pressure, and the stability period is longer than that at high pressures. In addition, the system needs a longer time to stabilize at the low flow speed due to pressure waves that occur. The stability of the system affected by the WH was examined, and the effect of fluid-specific variables such as velocity, pressure, and type of fluid in addition to the diameter of the pipe and their impact on WH stability was found. The behavior of stability at the WH is nonlinear, and that is why the linear and nonlinear parts of the governing equations of the structure are used to find system through the state-space method through programming and simulation of MATLAB program.

Unsaturated soil hydraulic conductivity K is a fundamental transfer property of soil but its measurement is costly, difficult, and time-consuming due to its large variations with water content (θ) or matric potential (h). Recently, C. Doussan and S. Ruy proposed a method/model using measurements of the electrical conductivity of soil core samples to predict K(h). This method requires the measurement or the setting of a range of matric potentials h in the core samples—a possible lengthy process requiring specialised devices. To avoid h estimation, we propose to simplify that method by introducing the particle-size distribution (PSD) of the soil as a proxy for soil pore diameters and matric potentials, with the Arya and Paris (AP) model. Tests of this simplified model (SM) with laboratory data on a broad range of soils and using the AP model with available, previously defined parameters showed that the accuracy was lower for the SM than for the original model (DR) in predicting K (RMSE of logK = 1.10 for SM v. 0.30 for DR; K in m s–1). However, accuracy was increased for SM when considering coarse- and medium-textured soils only (RMSE of logK = 0.61 for SM v. 0.26 for DR). Further tests with 51 soils from the UNSODA database and our own measurements, with estimated electrical properties, confirmed good agreement of the SM for coarse–medium-textured soils (<35–40% clay). For these textures, the SM also performed well compared with the van Genuchten–Mualem model. Error analysis of SM results and fitting of the AP parameter showed that most of the error for fine-textured soils came from poorer adequacy of the AP model’s previously defined parameters for defining the water retention curve, whereas this was much less so for coarse-textured soils. The SM, using readily accessible soil data, could be a relatively straightforward way to estimate, in situ or in the laboratory, K(h) for coarse–medium-textured soils. This requires, however, a prior check of the predictive efficacy of the AP model for the specific soil investigated, in particular for fine-textured/structured soils and when using previously defined AP parameters.

Abstract The main objective of this article is to analyse the structural design of tire lifting equipment for tire services. To gain a better insight into the problem, several steps must be taken. The first step is to conduct a market analysis, which involves identifying all available equipment. Several types of lifting devices were distinguished within the development process, which differ from each other in terms of design and power supply. The type of structure and power unit represent the second steps in the design process. This is a critical aspect of the design since the forces necessary to move the system change as a result of these attributes. The design itself is the last step in the device’s design. Passenger cars differ from each other by their weight, which is limited to 3.5 tons. Based on the weight, basic strength calculation and dimensioning of the lifting device are carried out. Based on the calculations, the scissor lift device is selected. The lower frame, scissor legs, ramp, mechanical lock, and scissors drive mechanism are five main components of the device. This type of structure is best used with a hydraulic drive unit, which is calculated in the article.

In the dispersed flow film boiling regime (DFFB), which exists under post-LOCA (loss-of-coolant accident) conditions in pressurized water reactors (PWRs), there is a complex interplay between droplet dynamics and turbulence in the surrounding steam. Experiments have accredited particular significance to droplet collision with the spacer-grids and mixing vane structures and their consequent positive feedback to the heat transfer recorded in the immediate downstream vicinity. Enabled by high-performance computing (HPC) systems and a massively parallel finite element-based flow solver—PHASTA (Parallel Hierarchic Adaptive Stabilized Transient Analysis)—this work presents high fidelity interface capturing, two-phase, adiabatic simulations in a PWR sub-channel with spacer grids and mixing vanes. Selected flow conditions for the simulations are informed by the experimental data found in the literature, including the steam Reynolds number and collision Weber number (Wec={40,80}), and are characteristic of the DFFB regime. Data were collected from the simulations at an unprecedented resolution, which provides detailed insights into the continuous phase turbulence statistics, highlighting the effects of the presence of droplets and the comparative effect of different Weber numbers on turbulence in the surrounding steam. Further, axial evolution of droplet dynamics was analyzed through cross-sectionally averaged quantities, including droplet volume, surface area and Sauter mean diameter (SMD). The downstream SMD values agree well with the existing empirical correlations for the selected range of Wec. The high-resolution data repository from the simulations herein is expected to be of significance to guide model development for system-level thermal hydraulic codes.

Problem statement. Architecture near rivers and other bodies of water reflects the artistic and stylistic features of cities. Modern surface architecture has been devided in two large groups and includes a large number of typological units. The first group is large hydraulic structures (canals, dams, locks, bridges). The second group are the buildings and structures with social and housing functions. Despite the different purposes, the objects of this group have a common structural scheme, which is represented by two components: a floating base and a superstructure [1]. Today buildings on water are very popular all over the world. The main reasons for this are overpopulation of the territory, high taxes on land and others. Such buildings are popular in Germany, the Netherlands, Great Britain, the United States of America, Venice, France, India, the Czech Republic and others. In Ukraine, the construction of buildings on water is promising and may become popular for the following reasons: rather short term of order implementation; long service life (up to 50 years); a large number of mooring places; closeness to nature; privacy of rest and others [2]. Due to the fact that the process of erecting buildings on water is quite complicated and covers several branches of production at once, consideration of the issue of ensuring safe working conditions is relevant and necessary. Also, this issue has its own specifics associated with the selection of workers and ensuring safety when working on water. Purpose of the article is an analysis of the state of safety and organization of safe working conditions during the erection of modern buildings on the water. Conclusions. 1. Fatal injury rates in the construction industry have consistently exceeded those in the mechanical engineering industry in recent years. At the same time, the indicators of fatal injuries in recent years have a tendency to increase and constancy in both industries. 2. The percentage of the main causes of occupational accidents is almost constant. The influence of the main hazardous production factors associated with the construction of buildings on water, for the most part, leads to the occurrence of accidents. 3. Drawing up recommendations for the safe implementation of consistently all stages of the construction of buildings on water is an important issue of our time, since such construction has great development prospects in our country.

The article presents the results of long-term field studies of the re-formation of water courses in the zone of the Takhiatash hydroelectric complex. It was noted that due to low water, for a significant part of the year, the Takhiatash dam worked with fully closed gates in all spans. In these years, the role of regulating the level regime of the shield dam is almost lost, and the end regulators of the main channels are regulated. The data of comparison of actual expenses, turbidity and back-up at the Takhiatash hydroelectric power plant with the calculated ones are presented. It is proved that sharp fluctuations in the water level in front of the dam and water intake into the channels lead to changes in the hydraulic and alluvial regime of the shield dam and channels. As the analysis of the survey of the riverbed cross-sections in the headwaters of the Takhiatash hydroelectric complex showed, in the initial period of operation, the bottom marks in the upper stream are increasing and the bottom marks in the lower stream are decreasing. Further years of operation (after 1982) were characterized by the stability of the flowing riverbed processes, that each characteristic year has its own level and consumption regime. It is noted that in high-water years there were no difficulties with water intakes, and the main difficulties are associated with the passage of flood flows through the shield dam. In recent years, there has been a rapid rise in the water level in the upper reaches, despite all the open dam gates, shipping locks and water intake structures, which are explained by the influence of the drifted streams on the capacity of the shield dam. It is proved that without any damage to the water intake during the growing season, it is possible to effectively flush the upstream with a constant decrease in the water intake coefficient - Kv < 0.55. Practically, this means for the Takhiatash hydroelectric unit that the flushing flow rate should not be lower than Q ≥ 250 – 300 m3/s.

Introduction: the article is dedicated to assessing the condition with respect to use for traffic methods of bridges as part of hydraulic structures (dams, hydroelectric power stations, locks). The main factors affecting the structural element’s durability included in the composition of the hydraulic structures are dynamic loads (applied repeatedly and repeated) affecting the bay due to the hydrodynamic effect; temporary, moving loads from passing highway transportation, along the top of the structure (along the roadway); harmful chemical impurities contained in the water passing through the structure. Under the influence of the above-mentioned factors, defects and damage occur in the hydraulic facilities’ structural elements. Methods: the authors assessed the actual state of the material of the operating structure. To assess structures and materials actual state during the bridge structure inspection work, the following instrumental measurements were performed on as-built structural elements: leveling the top of the sidewalks and the roadway; materials strength determination of the main supporting structures by nondestructive methods; thickness measuring the asphalt concrete pavement of the roadway; determination of the degree of carbonation of concrete; identification of defects in the elements of the bridge. The actual structure’s concrete strength was determined by nondestructive testing methods: (1) by the method of the elastic rebound; (2) by the shock pulse monitoring method; (3) an indirect method of concrete strength ultrasonic testing based on the revealed relationship between the method of separation with shear test and methods – shock pulse and elastic rebound. Results: technical condition and bridge safety indicators calculation as a hydraulic structure element was executed. Discussion: technical examination results of the bridge structural elements and instrumental studies confirm the conclusion about the repair measures need with high-strength concretes and protective coatings based on polymer composite materials. Final report: following the emergency scenarios a numerical estimate table for the quantitative and qualitative parameters list was made, parameters corresponding to a particular structure state. Thus, according to the scenario related to the 3rd accident group, the bridge technical condition is assessed as limited operable, and the safety level is reduced.

The general purpose of real-time monitoring of the technical condition of hydrotechnical structures of reclamation systems is to detect the deterioration (deterioration of the condition) of the degree of physical wear and tear, the reasons that entail the deterioration of condition, a decrease in efficiency of the structure. Materials and methods. The studies carried out were based on general scientific methods: descriptions, comparisons, statistical analysis, systems approach and economic and mathematical modeling. The objects of diagnostics of the technical condition of the hydrotechnical structure of the reclamation water complex include: dams, hydroelectric power plant buildings, spillways, drainage and water outlets, tunnels, canals, locks, piezometric systems, power units, perimeters of the hydraulic system, bridges, foundations. Results. It has been determined that the control of the state indicators on most hydraulic structures is carried out visually and with the help of control and measuring equipment, mainly by destructive methods, manually. The high potential of the process of automation of operations of technical diagnostics of the structures of the reclamation water industry complex has been revealed. The modern complex information systems used in the advanced sectors of the economy of Russia and the world are characterized. Possibility of qualitative improvement and development of the system of automated technical diagnostics of hydraulic structures due to the priority use of modern achievements of information technologies is presented. Conclusions: the developed methodology makes it possible to improve information technologies for diagnostics of hydraulic structures, the reasonable use of such a system establishes the duration of the safe operation of hydraulic structures, reduces operating costs during the period of use and with a negative impact on the environment, and creates new information systems that allow managing hydraulic structures.

Purpose: to develop structural solutions for recreation areas for fish, arranged on straight sections of fish channels. Materials and methods. The empirical basis for the development was the data of studies carried out on the existing fish passage channels and fish passage locks of the Don cascade of low-head river hydroelectric facilities, as well as materials from known and author's studies of the swimming ability and behavioral characteristics of anadromous migratory fish. When processing experimental data, methods of analysis and synthesis of experimental material were used, and when developing constructive solutions for recreation areas, experimental design technologies were used. Results and discussion. The initial materials of research on the existing fish passage structures (fish passage locks and fish passage channels) determined the need for construction of recreation areas for fish migrating through them in the fish passage channels. Structurally, recreation areas are formed by the arrangement of deepened or expanded sections of fish channels tracts, which makes it possible to reduce the flow velocities in them, increase the volume of living space and create conditions for restoring the energy potential of migrating aquatic organisms. The geometrical parameters and hydraulic characteristics of fish resting areas depend on the totality of interrelated morphometric and hydrological conditions of the canal tracts (determining the navigational conditions of migratory movement) and the biological features of anadromously migratory fish (mainly determined by swimming ability). Conclusions. General provisions for the design of recreation areas for fish are formulated, and their typical deepened, expanded and combined design solutions for the conditions of straight tracts of fish passages are developed. A typical solution for a different-depth and extended design of a recreation area has been tested (adapted) for fish-breeding, biological, topographic and hydrotechnical conditions of the Kochetovsky fish passage channel.

Introduction The counterculture that arose during the 1960s and 1970s left lasting social and political reverberations in developed nations. This was a time of increasing affluence and liberalisation which opened up remarkable political opportunities for social change. Within this context, an array of new social movements were a vital ingredient of the ferment that saw existing norms challenged and the establishment of new rights for many oppressed groups. An expanding arena of concerns included the environmental damage caused by 200 years of industrial capitalism. This article examines one aspect of a current environment movement in Australia, the anti-Coal Seam Gas (CSG) movement, and the part played by participants. In particular, the focus is upon one action that emerged during the recent Bentley Blockade, which was a regional mobilisation against proposed unconventional gas mining (UGM) near Lismore, NSW. Over the course of the blockade, the conventional ritual of waving at passers-by was transformed into a mechanism for garnering broad community support. Arguably, this was a crucial factor in the eventual outcome. In this case, we contend that the wave, rather than a countercultural artefact being appropriated by the mainstream, represents an everyday behaviour that builds social solidarity, which is subverted to become an effective part of the repertoire of the movement. At a more general level, this article examines how counterculture and mainstream interact via the subversion of “ordinary” citizens and the role of certain cultural understandings for that purpose. We will begin by examining the nature of the counterculture and its relationship to social movements before discussing the character of the anti-CSG movement in general and the Bentley Blockade in particular, using the personal experience of one of the writers. We will then be able to explore our thesis in detail and make some concluding remarks. The Counterculture and Social Movements In this article, we follow Cox’s understanding of the counterculture as a kind of meta-movement within which specific social movements are situated. For Cox (105), the counterculture that flourished during the 1960s and 1970s was an overarching movement in which existing social relations—in particular the family—were rejected by a younger generation, who succeeded in effectively fusing previously separate political and cultural spheres of dissent into one. Cox (103-04) points out that the precondition for such a phenomenon is “free space”—conditions under which counter-hegemonic activity can occur—for example, being liberated from the constraints of working to subsist, something which the unprecedented prosperity of the post WWII years allowed. Hence, in the 1960s and 1970s, as the counterculture emerged, a wave of activism arose in the western world which later came to be referred to as new social movements. These included the civil rights movement, women’s liberation, pacifism and the anti-nuclear and environment movements. The new movements rejected established power and organisational structures and tended, some scholars argued, to cross class lines, basing their claims on non-material issues. Della Porta and Diani claim this wave of movements is characterised by: a critical ideology in relation to modernism and progress; decentralized and participatory organizational structures; defense of interpersonal solidarity against the great bureaucracies; and the reclamation of autonomous spaces, rather than material advantages. (9) This depiction clearly announces the countercultural nature of the new social movements. As Carter (91) avers, these movements attempted to bypass the state and instead mobilise civil society, employing a range of innovative tactics and strategies—the repertoire of action—which may involve breaking laws. It should be noted that over time, some of these movements did shift towards accommodation of existing power structures and became more reformist in nature, to the point of forming political parties in the case of the Greens. However, inasmuch as the counterculture represented a merging of distinctively non-mainstream ways of life with the practice of actively challenging social arrangements at a political level (Cox 18–19; Grossberg 15–18;), the tactic of mobilising civil society to join social movements demonstrates in fact a reverse direction: large numbers of people are transfigured in radical ways by their involvement in social movements. One important principle underlying much of the repertoire of action of these new movements was non-violence. Again, this signals countercultural norms of the period. As Sharp (583–86) wrote at the time, non-violence is crucial in that it denies the aggressor their rationale for violent repression. This principle is founded on the liberal notion, whose legacy goes back to Locke, that the legitimacy of the government rests upon the consent of the governed—that is, the people can withdraw their consent (Locke in Ball & Dagger 92). Ghandi also relied upon this idea when formulating his non-violent approach to conflict, satyagraha (Sharp 83–84). Thus an idea that upholds the modern state is adopted by the counterculture in order to undermine it (the state), again demonstrating an instance of counterflow from the mainstream. Non-violence does not mean non-resistance. In fact, it usually involves non-compliance with a government or other authority and when practised in large numbers, can be very effective, as Ghandi and those in the civil rights movement showed. The result will be either that the government enters into negotiation with the protestors, or they can engage in violence to suppress them, which generally alienates the wider population, leading to a loss of support (Finley & Soifer 104–105). Tarrow (88) makes the important point that the less threatening an action, the harder it is to repress. As a result, democratic states have generally modified their response towards the “strategic weapon of nonviolent protest and even moved towards accommodation and recognition of this tactic as legitimate” (Tarrow 172). Nevertheless, the potential for state violence remains, and the freedom to protest is proscribed by various laws. One of the key figures to emerge from the new social movements that formed an integral part of the counterculture was Bill Moyer, who, in conjunction with colleagues produced a seminal text for theorising and organising social movements (Moyer et al.). Many contemporary social movements have been significantly influenced by Moyer’s Movement Action Plan (MAP), which describes not only key theoretical concepts but is also a practical guide to movement building and achieving aims. Moyer’s model was utilised in training the Northern Rivers community in the anti-CSG movement in conjunction with the non-violent direct action (NVDA) model developed by the North-East Forest Alliance (NEFA) that resisted logging in the forests of north-eastern NSW during the late 1980s and 1990s (Ricketts 138–40). Indeed, the Northern Rivers region of NSW—dubbed the Rainbow Region—is celebrated, as a “‘meeting place’ of countercultures and for the articulation of social and environmental ideals that challenge mainstream practice” (Ward and van Vuuren 63). As Bible (6–7) outlines, the Northern Rivers’ place in countercultural history is cemented by the holding of the Aquarius Festival in Nimbin in 1973 and the consequent decision of many attendees to stay on and settle in the region. They formed new kinds of communities based on an alternative ethics that eschewed a consumerist, individualist agenda in favour of modes of existence that emphasised living in harmony with the environment. The Terania Creek campaign of the late 1970s made the region famous for its environmental activism, when the new settlers resisted the logging of Nightcap National Park using nonviolent methods (Bible 5). It was also instrumental in developing an array of ingenious actions that were used in subsequent campaigns such as the Franklin Dam blockade in Tasmania in the early 1980s (Kelly 116). Indeed, many of these earlier activists were key figures in the anti-CSG movement that has developed in the Rainbow Region over the last few years. The Anti-CSG Movement Despite opposition to other forms of UGM, such as tight sands and shale oil extraction techniques, the term anti-CSG is used here, as it still seems to attract wide recognition. Unconventional gas extraction usually involves a process called fracking, which is the injection at high pressure of water, sand and a number of highly toxic chemicals underground to release the gas that is trapped in rock formations. Among the risks attributed to fracking are contamination of aquifers, air pollution from fugitive emissions and exposure to radioactive particles with resultant threats to human and animal health, as well as an increased risk of earthquakes (Ellsworth; Hand 13; Sovacool 254–260). Additionally, the vast amount of water that is extracted in the fracking process is saline and may contain residues of the fracking chemicals, heavy metals and radioactive matter. This produced water must either be stored or treated (Howarth 273–73; Sovacool 255). Further, there is potential for accidents and incidents and there are many reports—particularly in the United States where the practice is well established—of adverse events such as compressors exploding, leaks and spills, and water from taps catching fire (Sovacool 255–257). Despite an abundance of anecdotal evidence, until recently authorities and academics believed there was not enough “rigorous evidence” to make a definitive judgment of harm to animal and human health as a result of fracking (Mitka 2135). For example, in Australia, the Queensland Government was unable to find a clear link between fracking and health complaints in the Tara gasfield (Thompson 56), even though it is known that there are fugitive emissions from these gasfields (Tait et al. 3099-103). It is within this context that grassroots opposition to UGM began in Australia. The largest and most sustained challenge has come from the Northern Rivers of New South Wales, where a company called Metgasco has been attempting to engage in UGM for a number of years. Stiff community opposition has developed over this time, with activists training, co-ordinating and organising using the principles of Moyer’s MAP and NEFA’s NVDA. Numerous community and affinity groups opposing UGM sprang up including the Lock the Gate Alliance (LTG), a grassroots organisation opposing coal and gas mining, which formed in 2010 (Lock the Gate Alliance online). The movement put up sustained resistance to Metgasco’s attempts to establish wells at Glenugie, near Grafton and Doubtful Creek, near Kyogle in 2012 and 2013, despite the use of a substantial police presence at both locations. In the event, neither site was used for production despite exploratory wells being sunk (ABC News; Dobney). Metgasco announced it would be withdrawing its operations following new Federal and State government regulations at the time of the Doubtful Creek blockade. However it returned to the fray with a formal announcement in February 2014 (Metgasco), that it would drill at Bentley, 12 kilometres west of Lismore. It was widely believed this would occur with a view to production on an industrial scale should initial exploration prove fruitful. The Bentley Blockade It was known well before the formal announcement that Metgasco planned to drill at Bentley and community actions such as flash mobs, media releases and planning meetings were part of the build-up to direct action at the site. One of the authors of this article was actively involved in the movement and participated in a variety of these actions. By the end of January 2014 it was decided to hold an ongoing vigil at the site, which was still entirely undeveloped. Participants, including one author, volunteered for four-hour shifts which began at 5 a.m. each day and before long, were lasting into the night. The purpose of a vigil is to bear witness, maintain a presence and express a point of view. It thus accords well with the principle of non-violence. Eventually the site mushroomed into a tent village with three gates being blockaded. The main gate, Gate A, sprouted a variety of poles, tripods and other installations together with colourful tents and shelters, peopled by protesters on a 24-hour basis. The vigils persisted on all three gates for the duration of the blockade. As the number of blockaders swelled, popular support grew, lending weight to the notion that countercultural ideas and practices were spreading throughout the community. In response, Metgasco called on the State Government to provide police to coincide with the arrival of equipment. It was rumoured that 200 police would be drafted to defend the site in late April. When alerts were sent out to the community warning of imminent police action, an estimated crowd of 2000 people attended in the early hours of the morning and the police called off their operation (Feliu). As the weeks wore on, training was stepped up, attendees were educated in non-violent resistance and protestors willing to act as police liaison persons were placed on a rotating roster. In May, the State Government was preparing to send up to 800 police and the Riot Squad to break the blockade (NSW Hansard in Buckingham). Local farmers (now a part of the movement) and activist leaders had gone to Sydney in an effort to find a political solution in order to avoid what threatened to be a clash that would involve police violence. A confluence of events, such as: the sudden resignation of the Premier; revelations via the Independent Commission against Corruption about nefarious dealings and undue influence of the coal industry upon the government; a radio interview with locals by a popular broadcaster in Sydney; and the reputed hesitation of the police themselves in engaging with a group of possibly 7,000 to 10,000 protestors, resulted in the Office for Coal Seam Gas suspending Metgasco’s drilling licence on 15 May (NSW Department of Resources & Energy). The grounds were that the company had not adequately fulfilled its obligations to consult with the community. At the date of writing, the suspension still holds. The Wave The repertoire of contention at the Bentley Blockade was expansive, comprising most of the standard actions and strategies developed in earlier environmental struggles. These included direct blocking tactics in addition to the use of more carnivalesque actions like music and theatre, as well as the use of various media to reach a broader public. Non-violence was at the core of all actions, but we would tentatively suggest that Bentley may have provided a novel addition to the repertoire, stemming originally from the vigil, which brought the first protestors to the site. At the beginning of the vigil, which was initially held near the entrance to the proposed drilling site atop a cutting, occupants of passing vehicles below would demonstrate their support by sounding their horns and/or waving to the vigil-keepers, who at first were few in number. There was a precedent for this behaviour in the campaign leading up to the blockade. Activist groups such as the Knitting Nannas against Gas had encouraged vehicles to show support by sounding their horns. So when the motorists tooted spontaneously at Bentley, we waved back. Occupants of other vehicles would show disapproval by means of rude gestures and/or yelling and we would wave to them as well. After some weeks, as a presence began to be established at the site, it became routine for vigil keepers to smile and wave at all passing vehicles. This often elicited a positive response. After the first mass call-out discussed above, a number of us migrated to another gate, where numbers were much sparser and there was a perceived need for a greater presence. At this point, the participating writer had begun to act as a police liaison person, but the practice of waving routinely was continued. Those protecting this gate usually included protestors ready to block access, the police liaison person, a legal observer, vigil-keepers and a passing parade of visitors. Because this location was directly on the road, it was possible to see the drivers of vehicles and make eye contact more easily. Certain vehicles became familiar, passing at regular times, on the way to work or school, for example. As time passed, most of those protecting the gate also joined the waving ritual to the point where it became like a game to try to prise a signal of acknowledgement from the passing motorists, or even to win over a disapprover. Police vehicles, some of which passed at set intervals, were included in this game. Mostly they waved cheerfully. There were some we never managed to win over, but waving and making direct eye contact with regular motorists over time created a sense of community and an acknowledgement of the work we were doing, as they increasingly responded in kind. Motorists could hardly feel threatened when they encountered smiling, waving protestors. By including the disapprovers, we acted inclusively and our determined good humour seemed to de-escalate demonstrated hostility. Locals who did not want drilling to go ahead but who were nevertheless unwilling to join a direct action were thus able to participate in the resistance in a way that may have felt safe for them. Some of them even stopped and visited the site, voicing their support. Standing on the side of the road and waving to passers-by may seem peripheral to the “real” action, even trivial. But we would argue it is a valuable adjunct to a blockade (which is situated near a road) when one of the strategies of the overall campaign is to win popular backing. Hence waving, whilst not a completely new part of the repertoire, constitutes what Tilly (41–45) would call innovation at the margins, something he asserts is necessary to maintain the effectiveness and vitality of contentious action. In this case, it is arguable that the sheer size of community support probably helped to concentrate the minds of the state government politicians in Sydney, particularly as they contemplated initiating a massive, taxpayer-funded police action against the people for the benefit of a commercial operation. Waving is a symbolic gesture indicating acknowledgement and goodwill. It fits well within a repertoire based on the principle of non-violence. Moreover, it is a conventional social norm and everyday behaviour that is so innocuous that it is difficult to see how it could be suppressed by police or other authorities. Therein lies its subversiveness. For in communicating our common humanity in a spirit of friendliness, we drew attention to the fact that we were without rancour and tacitly invited others to join us and to explore our concerns. In this way, the counterculture drew upon a mainstream custom to develop and extend upon a new form of dissent. This constitutes a reversal of the more usual phenomenon of countercultural artefacts—such as “hippie clothing”—being appropriated or co-opted by the prevailing culture (see Reading). But it also fits with the more general phenomenon that we have argued was occurring; that of enticing ordinary residents into joining together in countercultural activity, via the pathway of a social movement. Conclusion The anti-CSG movement in the Northern Rivers was developed and organised by countercultural participants of previous contentious challenges. It was highly effective in building popular support whilst at the same time forging a loose coalition of various activist groups. We have surveyed one practice—the wave—that evolved out of mainstream culture over the course of the Bentley Blockade and suggested it may come to be seen as part of the repertoire of actions that can be beneficially employed under suitable conditions. Waving to passers-by invites them to become part of the movement in a non-threatening and inclusive way. It thus envelops supporters and non-supporters alike, and its very innocuousness makes it difficult to suppress. We have argued that this instance can be referenced to a similar reverse movement at a broader level—that of co-opting liberal notions and involving the general populace in new practices and activities that undermine the status quo. The ability of the counterculture in general and environment movements in particular to innovate in the quest to challenge and change what it perceives as damaging or unethical practices demonstrates its ingenuity and spirit. This movement is testament to its dynamic nature. References ABC News. Metgasco Has No CSG Extraction Plans for Glenugie. 2013. 30 July 2014 ‹http://www.abc.net.au/news/2013-01-22/metgasco-says-no-csg-extraction-planned-for-glenugie/4477652›. Bible, Vanessa. 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