Abstract English-language scientific publications regarding the assessment of hazards and risks in recreational water use have been generalized. International publication activity has been analyzed and mainstream and basic research lines of thematic studies have been identified. The results of studies of microbial pollution of water and sand on a beach, the behavior of microbial pathogens and their

Abstract Based on the analysis of scientific literature for the period from the end of the XIX century to the present, as well as the author’s own research, the information about meromictic waterbodies in Russia has been collected. The list includes 54 water bodies: 31 coastal water bodies of marine origin and 22 inland waterbodies, as well as the Black Sea, the world largest meromictic waterbody.

Abstract The environmental effect of landfills of solid municipal wastes is considered, including their effect on groundwater. The accumulation of municipal wastes causes considerable changes in the physical, chemical, and biological properties of groundwater. Leachates containing toxicants of all hazard classes reach water intakes. The effect of dumps can be minimized by the ecologically sound choice

Abstract Indirect chemical characteristics of organic matter concentration were determined in small streams in especially protected natural territories, including 15 tributaries of Lake Pleshcheyevo in the territory of Lake Pleshcheyevo National Park and the Tadenka River in Prioksko-Terrasnyi Nature Reserve. The tributaries of Lake Pleshcheyevo show distinct seasonal dynamics of organic matter concentration

Abstract Numerical modelling of ice growth and transport of matter in lakes, estuaries, or coastal seas can provide crucial input for improving the environment. In this paper, the goal is to model the thermal stratification and ice dynamics in Lake Teletskoye, which is located in the Altai republic of Russia. Lake Teletskoye is a deep lake with a maximum depth of 325 m. The Delft3D modelling suite

Abstract Variations in the concentration of 137Cs in lake water over 12–19 years of its migration were reproduced with the use of exponential and sorption–diffusion models in calculations. The concentrations of 137Cs in water of the deep (Нav > 7 m) lakes Inari and Vyalozero were decreasing with half-periods of 3.6 and 5.6 years, respectively, within which 137Cs concentration in water decreased by

Abstract The structure of phytoplankton of the Sea of Japan (Peter the Great Bay), located in the zone influenced by the technical ecosystem of Vladivostok thermal electric power station (VTES-2) (Vladivostok), has been studied throughout the year in the period 2014‒2015. Thermal pollution is two-stage: in the water intake trough, the water temperature rises by 2–3°C compared to background values;

Abstract A three-dimensional ocean general circulation model (Princeton Ocean Model) along with hydraulic calculations were used to evaluate the velocity of currents from the Sea of Azov into the Black Sea, which form at the displacement of domains of higher atmospheric pressure from northern rhumbs. Flow velocity was analyzed at different sections in the Kerch Strait for meteorological situations

Abstract The regional peculiarities of annual atmospheric moistening in European Russia are investigated using Standardized Precipitation and Evapotranspiration Index (SPEI). It was found that the proportion of the years with considerable moistening deficiency rose in the drainage basins of the Northern Dvina, Pechora, and Don and dropped in the Volga basin in 1991–2018 vs 1961–1990. The study revealed

Abstract This article examines the reliability of rainwater harvesting (RWH) systems in subcatchment area. Using water balance simulation and two definitions of this value (time-based and volumetric ones), the reliability of rainwater harvesting systems for 25 locations in Medenine’s dryland agricultural areas in south-eastern Tunisia is assessed. Extensive computer software was created using modelling

Abstract The dynamics of benthic communities of various reaches of the Kuibyshev Reservoir over a long-term observation period 1966 to 2016 has been statistically analyzed. The results of a comparison of the spatial-temporal distribution of structural indicators of chironomid (Chironomidae) communities, including the species diversity and abundance of 48 taxa based on hydrobiological survey data in

Abstract Long-term observation data (2003–2018) of 625 stations were analyzed to determine the distribution of organochlorine pesticides (DDT, hexachlorobenzene, and hexachlorocyclohexane) and polychlorbiphenyls in bottom sediments of the Barents Sea. The concentrations of pollutants were analyzed for the sea as a whole and separately for six chosen regions: Spitsbergen shelf, Medvezhinskii trough

Abstract In February 2020, geochemical tracers along with hydrochemical and hydrological characteristics were used to reveal a discharge site of salt groundwaters in the head of the Razdol’naya R. estuary at a distance of 22 km from its mouth bar. The elevated activity of 224Ra isotopes from 11.1 ± 0.1 to 2.2 ± 0.05 Bq/m3 in the bottom water layer over a distance of 15 km indicates to the propagation

Abstract The current level of groundwater resources development has been evaluated for the territory of municipal unit, urban district Usinsk, Komi Republic, and the potential of an increase of water intake at deposits has been substantiated. A hydrogeodynamic model of the geological–hydrogeological conditions, reflecting the natural–technogenic situation, has been developed and used to evaluate the

Abstract The density of particles in the bottom deposits of water bodies is an important characteristic, which determines the rate of interaction between bottom water layers with the surface layer of bottom sediments and which in the modern studies cannot be assumed constant. In the presented article, the variability of this characteristic is evaluated for Lake Ladoga. This variability requires correction

Abstract The splashes that form on the surface of water bodies under the effect of strong winds have a considerable effect on evaporation, as well as on the exchange by heat and momentum and the transport of matter, e.g., salt aerosol, which affects clouds and precipitation. An important factor in this case is the height of splash rise and the time it spends in the air. In the case of rapidly moving

Abstract Quantifying the relative contributions of climate change and human activities to water and sediment variations is of great importance for regional resources and river basin management, which has become a hot topic in hydrology research. In this study, water discharge and sediment load in Xiangxi River basin of Three Gorges Reservoir area were investigated based on hydrometeorological time

Abstract Drought limit water level has been presented to guide reservoir drought resistance for years. However, current static drought limit water levels neglected the water transfer relationship among different periods. In this study, the Yuqiao Reservoir located in Tianjin, China, was taken as the study area. To avoid the excessive subjectivity brought by the conventional typical drought-year selection

Abstract Piano Key Weirs (PKW) is a free-flowing weir, and an improvement over the labyrinth weir family. PKW has higher discharge for the same head as compared to other types of weirs. They tend to reduce the upstream submergence in reservoirs or other flow systems and can be effectively used for flood risk mitigation. CFD studies have been carried out earlier but mostly for H/P (Total head to height

Abstract A new method was used for experimental simulation of the sorption–desorption transformation of microelement composition of the adsorbed complex of solid substances of river runoff at the interaction with seawater. The experimental results suggest the conclusion that a change of freshwater to marine conditions is accompanied by desorption of some elements and sorption of others. The desorption

Abstract The properties of natural waters are largely determined by the unique characteristics of this liquid; however, they are commonly not properly taken into account, and instead the concept of water as a continuous medium with foreign microcomponents is considered adequate. This approach is not appropriate for solving the problem of water resources management and the choice of innovation ways

Abstract Factors like intensive industrial and socio-economic development can lead to the deterioration of the water environment. At the same time, economic, social, and population sustainability rely on good water conditions in the river. Therefore, it is important to calculate the water environment capacity and allocate it accordingly. Our research selects the economic, social, and environmental

Abstract The article gives the results of studies of the concentration and composition of aliphatic hydrocarbons in suspension in surface water and in the surface layer of bottom sediments in April and September 2019 in Kerch Strait compared with other regions of the Black Sea. Notwithstanding the high concentrations of aliphatic hydrocarbons (especially, in the water of the strait itself, i.e., 110–160

Abstract The factors of phytoplankton development in the stratified Mozhaisk Reservoir are analyzed on the basis of long-term observations and model calculations. To analyze the variability of phytoplankton biomass values, the weather contrast index based on the identification of synoptic cycles of water surface temperature was used. A comparative assessment of the water blooming intensity in different

Abstract Examples are given for numerical modeling of rain-induced flash floods in mountain areas based on actual and forecast data on precipitation. The calculated hydrographs are compared with the data of hydrometeorological network and calculations of other authors. Two hydrological models were applied: STREAM 2D CUDA, based on numerical solution of the shallow water equations in a two-dimensional

Abstract The aim of this study is to develop a new trophic level index using water quality parameters which are known to affect eutrophication but not in national and international standards used for trophic classification and to demonstrate the applicability of index. For this purpose, water quality variables obtained from shallow lakes were statistically analyzed by using principal component analysis

Abstract The article considers the conditions under which the water resources and chemistry are forming in the mineral Bormashovoe Lake, which lies on the Svyatoi Nos Peninsula on the eastern coast of Lake Baikal. The study was focused on water and free gas, which releases from bottom deposits and lakes in the Svyatoi Nos Peninsula. The results represent the analysis of water samples taken in ice-free

Abstract Among all hydrological factors, water regime characteristics have always received special attention as integral parameters of the hydrological conditions of a water body, because they can be used in various estimation and forecast procedures. This study considers the development, in both Russia and other countries, of various theories and approaches to zoning the territories by the specific

Abstract The effect caused by the typhoon Goni in the coastal water of Posyet Bay, the Sea of Japan, is considered. In nearshore expeditions, profilograph SBE-19plus was used to measure the hydrological characteristics: water temperature and salinity, as well as the hydrobiological characteristics of the fluorescence of chlorophyll a and dyed dissolved organic matter a week after the passage of the

Abstract Natural and anthropogenic processes contribute to the formation of excessive concentrations of nitrogen compounds in the biosphere. As a result of chemical reactions, this may lead to the synthesis of nitrosamines. Nitrosamines are toxic agents that show carcinogenic, mutagenic and teratogenic properties and have a negative effect on living beings. The data on the content of these substances

Abstract The effect of the horizontal dimensions of inland water bodies (lakes and reservoirs) on the vertical mixing processes is studied. We consider a three-dimensional hydrostatic model and a one-dimensional LAKE model based on the averaging of three-dimensional equations over a horizontal section of the water body. The processes of vertical mixing in both models were simulated with the use of

An Erratum to this paper has been published: https://doi.org/10.1134/S0097807821120010

Abstract The study was carried out under the international Earth System Model–Snow Model Intercomparison Project on ten experimental well-instrumented snow sites in different parts of the Earth and aimed to examine the ability of the SWAP land surface model, developed by the authors, to reproduce the current characteristics of snow cover dynamics. A procedure was developed for scenario projecting of

Abstract The results of model calculations of the characteristics of anoxic zones in the Mozhaisk Reservoir over a 57-year period have been analyzed. A two-dimensional box hydrological model of the reservoir has been used to calculate variations of the values of ecological variables with a daily time step. The main regularities in the formation and development of anoxic conditions in different parts

Abstract Annaba gulf is a coastal area (southwestern Mediterranean Sea) that receives large diffuse inputs from Fertial plant, Seybouse wadi and Boujemaâ wadi, which are influenced by anthropogenic activities. Wastewaters and surface waters and sediments from these sites were analyzed for Polycyclic Aromatic Hydrocarbons (16 PAHs) by using gas chromatography system operating with the flame ionizing

Abstract Due to the saturation of natural waters with nitrogen compounds resulting from natural processes and anthropogenic activities, the problem arises of studying the ways of their migration, transformation in the hydrosphere and in aquatic biota. One of the ways of nitrogen transformation in the environment is the formation of nitrosamines—toxic organisms or biota that exhibit carcinogenic, mutagenic

Abstract The short lifetimes of multibranch delta systems are proved based on the theory of dynamic stability of delta branches and causes of its violation. Typical cases of such brevity and natural causes of the decay of some branches and the activation of others are considered. Examples of such processes in different deltas are given.

Abstract For the first time, the concentration of plastic particles in surface water of Lake Baikal was evaluated. The concentrations of plastic particles were evaluated in trawl samples taken in the coastal zone of the most densely populated southeastern coast and in the Maloe More―one of the most popular tourist zones in Baikal. Converted to water surface area, the concentration of plastic particles

Abstract A joint data repository on flowage lakes of the world and long-term flow variations in the rivers they regulate has been formed. The specific features of the flowage lake parameters have been analyzed along with their dependence on the characteristics of the lakes. A hypothesis has been proposed implying the global invariance of the coefficient of water exchange of lakes with respect to the

Abstract The objective of this study is to develop an anthropic exposure indicator for river basins using quantitative and qualitative aspects of the landscape and morphometric analysis based on fuzzy logic and geoprocessing. The indicator was developed from a Mamdani type fuzzy inference system by integrating information regarding the calculation of the anthropic transformation index and the circularity

Abstract New data on the contents of plant pigments and organic matter in bottom sediments of channel, floodplain and estuarine biotopes of the Gorky Reservoir (upstream Volga, Russia) are presented. Patterns of the distribution of sedimentary chlorophyll a and the products of its degradation, pheopigments, depending on the water current velocity, depth and type of the bottom sediments were revealed

Abstract Global reanalysis products are extensively used for hydrologic applications in sparse data regions. The establishment of some inputs for hydrologic modelling from global reanalysis requires prior scrutiny and assessment. Thus, the present study attempts to exploit Climate Forecast System Reanalysis datasets for the Mereb-Gash river basin in Eritrea, with the objective of preparing input data

Abstract The paper highlights results obtained from collation between river water quality in mountain regions of Russia and Armenia employing two different methodological approaches: a method of a complex assessment by hydrochemical parameters by a Specific Combinatorial Water Pollution Index (SCWPI) and the Canadian Water Quality Index (CWQI). Assessment was done of water quality of typical, identical

Abstract The effect of a large mining complex of Apatit JSC on the aquatic ecosystem of Lake Imandra is discussed. Hydrochemical data are given to characterize the pollution zone, and the distribution and accumulation of chemical elements between abiotic and biotic ecosystem components, including water, bottom sediments, seston, and fish, are described. It is proved that the polluted subarctic lake

Abstract The δ2H and δ18O values of the atmospheric precipitations in the Khibins vary within the range –147 ≤ δ2H ≤ –37‰, –20 ≤ δ18О ≤ –4‰ and are close to the global line of the precipitations for the northern hemisphere; the light values (with a positive deuterium excess) are typical of snow, while the heavy values are typical of rains. The data on the isotopic composition of water in open water

Abstract The forked channel is a rare and poorly known type of branching channel, the distribution of flow in which is of key importance for water transport, economic activities, and water resources development. The article is the first to analyze the distribution of the flow of water and suspended sediments between the major two branches of the forked channel of the Lower Ob, i.e., the Malaya Ob and

Abstract The study of oil entrainment mechanism is the basis of the vertical process modeling of spilled oil at sea. In order to reveal the effect of plunging breaking waves, a dripping water experiment on the oil film on static water was designed. It is found that with the increase of the dripping effect, the oil film will form a puddle, or a bubble, or droplets in the water. It can be deduced from

Abstract The changes in the ratio of species representing different morpho-functional groups, identified by physiological, morphological and ecological parameters [29] were analyzed based on the study on phytoplankton in different reaches of the Rybinsk Reservoir in 2000–2005. Water quality was assessed by the Q index of communities, developed taking into account the proportions of these groups. This

Abstract Dongying City is located in the northeast of Shandong Province and is the central city of the Yellow River Delta. It has abundant oil and gas resources, vast saline-alkali land area, and saline brine as the main groundwater. Therefore, freshwater resources are poor, as there is a contradiction in the water supply and its demand. Judging the trend of sustainable utilization of water resources

Abstract Long-term experimental data collected by the authors were analyzed to characterize the formation of spring surface flow in different natural zones of the Volga and Don basins with the use of water-balance method (hydrologic experimental plots) for its treatment, and literary data on such studies were generalized. The obtained unique material was used to characterize the surface runoff separately

Abstract Studies of water balance and variations of water regime of rivers in the Don Basin have shown a steady trend toward a decrease in spring flood volumes and an increase in runoff volume in winter since the mid-1980s. More frequent thaws have resulted in that snowmelt runoff formation can be seen almost throughout winter. A decrease in soil moisture content in the late October along with a decrease

Abstract The article considers the set of water management problems that has formed in the Don Basin in the context of current changes in the hydrological regime of rivers and an increase in the demand for the reliability of water resources available for economic sectors. Despite the decline in production and water consumption, the ecological conditions of water bodies in the basin have not improved

Abstract The article provides an overview devoted to wastewater treatment from nutrients and organic toxicants in Constructed Wetlands (CW). The analysis of the main microbiological processes of wastewater purification in these systems is made. It is shown that biological indicators and parameters of the plant, obtained by the molecular biological methods are the basis for the understanding and tracking

Abstract Water balance studies have been carried out in the territory of sand massifs in the Don River Basin. The studies were mostly focused on the water-regime plots in Kalachevsko-Golubinskie and Archedinsko-Donskie sands. The area under study was divided into zones according to sand types based on land relief, the conditions of the soil cover, vegetation, and phreatic-water mineralization and level

Abstract The deficiency of water resources in the Don River Basin is demonstrated along with the administrative division of the basin territory and the population of the Russian Federation as of January 1, 2018. The present-day state of the key participants of the water-management system is analyzed. Data are given to characterize the increase in the availability of central water supply to housing

Abstract Shouguang City is located in north-central of Shandong, distributing the piedmont plain and coastal plain from the south to north. This area, as a vegetable base in northern China, not only meets local needs but also has a large number of vegetables exported to domestic and foreign countries in the form of virtual water. The vegetable production in this area mainly depends on groundwater exploitation

Abstract Spatially high-resolution precipitation data is important for the users to study basin-scale hydro-logy and climate change. Inner Mongolia is a vast and sparsely populated region with sparse rainfall distribution. The Tropical Rainfall Measuring Mission (TRMM) satellites provide a remote-sensing data source covering the whole globe but is generally in coarse spatial resolution and cannot satisfy

Abstract Data on the maximal runoff of rivers in the Don Basin during spring flood are generalized, the cases of nonstationarity of time series are identified along with periods when such changes have taken place. The obtained results are used to evaluate the characteristics of maximal flow of spring flood under nonstationary conditions with the use of Bayesian approach. The results are given as a

Abstract Water quality data parameters consist of a large data set. Such a large amount of data incurs great effort in processing and conducting visualization techniques to facilitate the analysis and building of the necessary views for decision makers. The current study included a set of steps to data reduction for 34 parameters during two seasons, at different sites and depths for Mosul Dam Lake

Abstract Present-day changes in the landscape structure of the Don Basin are analyzed. Data of water-balance stations are used to determine the contributions of various land types to the formation of spring surface flow. Estimates are given for the present-day anthropogenic and climatic changes in the surface flow and infiltration into soil in plowed lands during spring flood, as well as river flow