Abstract The Kud’ma River, a tributary of the Cheboksary Reservoir, has been studied to evaluate the contributions of the surface and subsurface runoff components and perched groundwater runoff to the diffuse export of mineral nitrogen and phosphorus from river catchment areas in the northern part of the forest-steppe zone in the Volga basin. The role of water balance elements in the removal of nutrients

Abstract Macrozoobenthos analyses were used to evaluate the ecological water quality in the Shuya River, a large tributary of Onega Lake, which determines water chemistry in the water intake of Petrozavodsk City, the capital of the Republic of Karelia. Water quality indices, widely used in the world practice, were applied, including FBI, EBI, BMWP, ASPT, BBI, IBGN, GW, EPT, and IM, as well as the integral

Abstract Hydrological runoff prediction in a reliable and precise manner contributes significantly to the optimal management of hydropower resources. Considering the importance of runoff prediction, this study proposed a hybrid model, namely VBH (VMD-BP), coupling variational mode decomposition (VMD) technique, and backpropagation (BP) based artificial neural network (ANN), to predict the monthly runoff

Abstract The causes and features of storm surges formation in the Venetian Lagoon are discussed. The experience of sea level observations in Venice and the history of floods caused by storm surges, in particular, acqua alta of 1966 and 2019, are described. The recurrence of storm surges was found to increase in the recent 60 years. The hydroengineering measures aimed to protect Venice against floods

Abstract The distribution of volatile organic compounds was studied in water and bottom sediments of estuaries of small tidal rivers. In the under-ice period, water showed high concentrations of organic matter: from 4.2 до 29.2 mg/L in fresh water, from 12.2 to 80.4 mg/L in slightly saline water, and 404 mg/L in seawater. The concentration of organic carbon in bottom sediments varied from <0.10 to

Abstract The subsurface runoff in the permafrost zone shows considerable structural and seasonal specifics. The structural features are due, on the one hand, to the lithologically determined permeable zones of rock massifs and, on the other hand, the permeability governed by lithology. This permeability is a seasonal factor of water flow from the territory, and now it is the focus of studies in various

Abstract Groundwater flow in the vicinity of a vertical circulation well is considered. The article presents solutions of problems of steady-state and transient groundwater flow near a vertical circulation well in an anisotropic aquifer, taking into account skin and wellbore storage effects for pumping and injection intervals. Myatiev–Girinskii scheme was used to obtain an analytical solution of the

Abstract Lake Water storage can be estimated based on Lake Boundary and lakebed terrain. The boundary of a lake can be extracted from the remote sensing satellite image or the Unmanned Aerial Vehicle (UAV) orthophoto, but the information of the lake and its surroundings, which is supposed to be three-dimensional, is recorded in two dimensions in this way. When the tall and dense vegetation are projected

Abstract The characteristics of the runoff and sediment in the Yellow River were analysed and predicted Based on measured data of from 1951 to 2017. Initially, the phase characteristics of runoff and sediment were analysed by the cumulative anomaly curve method. After that, the trend and catastrophe of runoff and sediment are discuessed using the Mann-Kendall methods. The results revealed that the

Abstract Water flow in the Don R. delta is described by a system of Saint-Venant equations written in the characteristic form. The calculation domain is represented as a graph with edges corresponding to channel segments and nodes corresponding to branching points. The problem was solved by finite-difference methods with equations approximated by implicit schemes. The simulated water discharges and

Abstract Changes in the water balance components of 11 large-scale river basins due to possible climate change during the 21st century were simulated with the land surface model SWAP and meteorological projections from five Global Climate Models (GCMs) under four RCP climatic scenarios. An analysis of 20 projections of changes in climatic precipitation, river runoff and evapotranspiration obtained

Abstract Detail 3D digital elevation model with a high-accuracy efficient software for 2D-modeling STREAM 2D CUDA and actual data on high-water marks and the dynamics of water level variations during a flood in 2019 on the Iya R. near Tulun Town were used to evaluate the maximal water flow rate and to plot the hydrograph of extreme flood near Tulun Town. The calculated complex dynamics of the inundation

Abstract The scour and flow field patterns with accumulation of debris around bridge piers are completely different due to the reduction of flow area and the increase in depth average velocity. Accordingly, the risks of bridge piers failure are increased due to the evolution of scour depth. This paper aims to analyse the effect of rectangular debris accumulation around single and dual cylindrical piers

Abstract Lake Seliger has been always classified as a former glacial water body, a remnant of a vast proglacial lake, which has existed since the disappearance of the last glacial Ice Sheet in the territory 18–19 thousand years ago. The study was focused on areas of southern pools of the lake looking like underflooded meandering river channels. Bottom sediments were drilled in three such areas and

Abstract Methodological approaches to water consumption forecasts are described. Demographic forecast and forecasts of the coefficient of water demand for regions in the Don basin are used to forecast domestic water demand. Summary data on the extension of irrigated lands over 2008–2018 in 15 constituent entities of the Russian Federation in the Don basin are given. The actual and forecasted areas

Abstract Turbulent phenomenon in braided rivers is much more complex compared to the straight and meandering rivers. The turbulent flow structure at locations upstream and downstream of the mid-channel are analysed experimentally and numerically by plotting the vertical profiles of velocity and turbulent parameters. Fluent Computational Fluid Dynamics (CFD) code is used to satisfactorily validating

Abstract A linear approximation and a finite-element hydrodynamic model ADCIRC were used to study seiche oscillations in the system of Sevastopol bays caused by wave perturbations on the liquid boundary of the model domain. The calculations were carried out for perturbations with periods from 1 to 52 min with impact duration from 4 to 24 h. Resonance periods were found for the bays in the system. The

Abstract A single study investigates the possibility of using adaptive control of the reservoir Vranov Reservoir situated on the Dyje River. The control algorithm uses a fuzzy model that approximates the I/O relationships contained in the behaviour matrix of the target reservoir, constructed using the differential evolution optimisation method. Recurring predictions of water inflows into the reservoir

Abstract The article presents a study of the hydrological regime of the Lena and Mackenzie rivers, flowing in the zone of permafrost rocks of different types. Features typical of river mouths in subarctic zone are identified. Sediment transport in both deltas and the export of material into the Laptev and Beaufort seas is studied. Permafrost rock characteristics are given and their changes under the

Abstract Predicting the Suspended Sediment Load (SSL) of the river is a very significant and challenging task. Being a non-linearity in the SSL data, it requires a non-linear method to get predicated in absence of field measurements. In recent decades, the application of Artificial Neural Networks (ANNs) has been considered as a milestone for the prediction of different hydrological parameters. Therefore

Abstract The article presents the experience in the application of a hydrological conceptual model HBV, including its standard version and modifications, to studying runoff-formation processes on small experimental catchments in the upper reaches of the Ussuri R. based on field observation data in the warm seasons from 2012 to 2019. It was shown, that, in many cases, whatever the structure of the model

Abstract Present study aims to illustrate the role of form-induced shear stress on turbulent kinetic energy (TKE) budget distributions in permeable gravel bed streams. In order to achieve the objective of this study, some significant experimental works on turbulent flow characteristics over rough beds are reviewed first and compared with the results of present studies. Uniform gravels (d50 = 4 cm)

Abstract Meromictic water bodies (water bodies with stable vertical water stratification, which forms because of a difference between the density of its layers) is a rare phenomenon, which deserves protection. On the territory of Russia the territory of Russia in its boundaries of 2020, 53 meromictic lakes were identified, including 30 coastal water bodies of marine origin, 10 karst lakes, 5 glacial

Abstract Quantification of infiltration characteristics of soil is a complex problem because of its variability, selection of suitable infiltration model, and determination of infiltration model parameters which depend on various soil characteristics and land uses. In this study four different infiltration models, namely, Horton, Kostiakov, Modified Kostiakov and Philip were considered. Infiltration

Abstract The volumes of groundwater pollution in the zone of technogenic impact were calculated. A hydrochemical anomaly formed because of the penetration of industrial liquid wastes into the environment. The infiltrates reach groundwater table, mix with this water, and propagate with its flow. The anomaly shows a relatively high total water TDS. In the mixing zone of technogenic and natural waters

Abstract For the first time, by analyzing the spatial variations and diurnal dynamics of the water regime of the small river of the Anadyr Lowland, the main sources were studied and the dynamics of the river discharge feeding were estimated. In the midstream and downstream reaches of rivers, the stability of the water regime is ensured by thawed waters of seasonal ice; in mountain rivers’ headwaters

Abstract With conventional monitoring at low-frequency, biological responses to weather-related events are missed. In this paper, we examine the chlorophyll-a concentrations in a shallow lake using high-frequency data from an in situ buoy. Also, we used monthly data of phytoplankton to relation high and low-frequency data. This is the first study about chlorophyll-a in high-frequency from a buoy in

Abstract An analytical model was developed to predict the boundary shear stress and the depth-averaged streamwise velocity in the breach. A more general expression of the depth-integrated form of the streamwise Reynolds averaged Navier-Stokes (RANS) equation was rewritten by considering the secondary flow effects. It accounts for secondary flow effects via the dimensionless secondary flow parameters

Abstract Based on images from the Sentinel-2 satellite taken in 2017–2019, a map of shallows in the Yenisei delta was compiled. This paper highlighted the methodological problems that arise at using satellite images for research and mapping of underwater relief; the ways of their solution are offered. Consideration of the depth of penetration of sunlight into the water and analysis of the spectral

Abstract Different types of transboundary water exchange in Russia are considered, including through state, administrative, and natural boundaries. The presented characteristics refer to atmospheric moisture transport, wind induced mixing of snow, water transport in the form of runoff through the boundaries of individual landscape elements and through the boundaries of natural zones. The extent of

Abstract Data of hydrogeochemical studies of the Ivano-Arakhleiskie Lakes have been collected for different climatic phases of territory moistening. Three groups of water bodies are identified, including ultrafresh, fresh, and slightly saline. The lake waters are shown to differ by mineralization, chemistry, and pH. The least mineralized waters are found to be of HCO3-Ca type, which, at an increase

Abstract Materials of ISI-MIP International Project were used for global simulations of water balance components for the entire Earth surface (except for Antarctica) with a spatial resolution of 0.5° × 0.5° over a period of 1971−2099 with the use of physically based SWAP model, describing the processes of heat and water exchange between the land surface and the near-surface atmosphere layer, and the

Abstract The strengthening of anthropogenic pressure on the catchments of small and medium-sized rivers of the Central Black Earth region of Russia, associated with significant plowing and an increase in the number of livestock complexes, contributes to an increase in the concentrations of organic substances and nutrients in permanent watercourses. At the same time, the sources of their point discharges

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