AbstractAn Information–Modeling Complex has been developed for the information support of managerial decision making in the field of rational use, protection, and restoration of reservoir ecosystems. The system successively implements three mathematical hydroenvironmental models of the system Nizhnekamskoe Reservoir Drainage Basin―the Nizhnekamskoe Reservoir―the Kuibyshev Reservoir. The complex of

AbstractThe water quality parameters, like major ions, have been monitored at three stations located along the Syr Darya River. The trend analysis was performed on annual timescales using the Mann–Kendall test, the Sen’s slope estimator and the linear regression. The relationships of the water quality parameters to river discharge were also investigated. The statistical methods showed both positive

AbstractThis study explores the statistical relationship between spectral reflectance and hydraulic conductivity (K) of fluvial sediments in two Nebraska rivers. The spectral reflectance curves of sediments are obtained through hyperspectral instruments under controlled conditions. The K values are determined by three different methodologies, grain size analysis, an in-situ permeameter test, and a

AbstractDez River in Iran is a long river and has generally good-quality water. Unfortunately, in this river water quality has decreased over recent years due to drought, industrial and agricultural developments. Dez River plays a significant role in moderating the quality of Karun River After adjoining it. So, maintaining good water quality of Dez River is very important. In this case study, water

AbstractThe hydroecological simulation model GMV-MGU is applied to the Nizhnekamskoe Reservoir. The results of a series of diagnostic model calculations, which characterize the ecological state of the reservoir over 2012–2015, are discussed. The results of calculations are used to establish the major regularities in the space and time variations of water quality characteristics in the Nizhnekamskoe

AbstractSurface water quality could be interactively affected by the natural factor (seasonal variation) and human pollution source (industrial, agricultural, and residential sources). The current study was conducted in Hau Giang province in southwestern Vietnam (1) to investigate the interactive effect of natural factor and human pollution source and (2) to identify potential mechanisms related to

AbstractThe article gives the results of studies of the pollution level of soils, grounds, groundwater, water, and bottom sediments in water objects in Burnakovksyaya lowland in Nizhny Novgorod City as factors governing Volga water quality. The obtained data were used to reveal a polyelemental pollution of all environmental components in the study area with different levels, mostly caused by the past

AbstractThe article presents the results of summer dry-season areal surveys of subsoil water chemistry in the drainage basin of the Ivankovo Reservoir in the Volga segment from Tver City to Dubna City over period 1981–2019. The zone of subsoil water pollution by nutrients has shifted from the anthropogenic landscapes of agricultural fields to residential areas: horticultural and cottage settlements

AbstractThe objective of this study was to compare and assess the quality and study the hydrochemistry of groundwater in the Al-Baha and Al-Qassim areas, representing the Arabian Shield and Arabian Shelf, respectively, of the Arabian Peninsula. The chemical and microbiological constituents of the groundwaters of the two sites were acquired and compared. The Al-Baha analyses indicated that the underground

AbstractThe study is focused on examining and simulating the formation processes of the runoff and pollution export in the case of Rostov (Rostov Velikii), a town in the Volga basin. The diffuse runoff from Rostov territory and its spatial distribution were evaluated for the following components: ammonium, total iron, oil products, sulfates, chlorides, suspended matter, as well as COD and BOD5. The

AbstractRegularities in the formation of diffuse pollution of water bodies are discussed as their understanding is required for the development of an adequate water-protection strategy. The main scientific, methodological, and managerial problems of the regulation of diffuse pollution are related to the character of pollutant inputs into the environment and the complex character of the relationships

AbstractThe general concepts of the arrangement of water body monitoring are considered, which assume more effective use of the available data and observation systems and the implementation of additional studies and managerial activities aimed to take into account the formation factors of natural water quality under the effect of diffuse pollution sources.

AbstractA prototype of an expert system for decision-making support in optimizing measures aimed to protect pilot water objects from diffuse pollution in the Volga basin was developed based on special expedition studies carried out in 2018–2019, generalized results of earlier long-term studies, improved methodological approaches, and specially developed GIS. The prototype consists of fine interrelated

AbstractThe physically based ECOMAG-HM model, developed to simulate heavy metal cycles in large river basins, was used to study the spatial and temporal regularities in the formation of copper and zinc distributions in water bodies in the basin of the Nizhnekamskoe Reservoir. Maps of the mean annual concentrations of the metals in river network and the mean annual modules of diffuse runoff with its

AbstractThe role of diffuse pollution of water bodies in the formation of water quality in them is characterized. Some features of diffuse pollution, which are of importance for managing the process of their reduction, are identified. The main lines of the activity for managing the reduction of diffuse pollution are determined and characterized, including basin programming, regional planning, ecological

AbstractIn existing studies, external factors, such as hydrologic, hydraulic, and decision-making uncertainties, have been widely recognized as major risk source in reservoir flood routing. There are few researches focused on the intrinsic uncertainties which rooted in the reservoir flood routing modeling, for instance, the sensitivity of the water level to the initial condition in the passage of flood

AbstractEstimate is made for the possible reduction of nutrient export from the drainage basins of tributaries of the Kuibyshev Reservoir through the introduction of the best available technologies of agricultural production. The activity of more than eight hundreds of agricultural enterprises in the reservoir drainage basin was analyzed. Different types of underlying surface were classified with the

AbstractThe issues of formation and assessment of diffuse pollution of water objects in the zones near large mining and chemical industrial complexes are discussed. The study object is the Kama River (Kama Reservoir) in the zone of influence of the Solikamsk–Berezniki Industrial Hub. The major flows of pollution are due to seepage recharges from the operating and removed from service sludge storage

AbstractThe possible input of nutrients-pollutants into water bodies in the Upper Volga basin from agricultural lands is evaluated for the case of the Yakhroma R. with a basin area of 1437 km2. Water quality was studied along river profile to show that the sources of nutrient pollution, in addition to wastewaters from the cities of Dmitrov and Yakhroma, are agricultural lands on the water divide and

AbstractIn this study, hydrologic regimes of the Palas basin have been investigated with land use/land cover (LULC) change. To investigate the relationship between precipitation and surface runoff, a SWAT (Soil and Water Assessment Tool) model was developed and runoff response was analysed under different LULC conditions. Firstly, Post classification change detection technique was used to prepare time

AbstractA brief description is given for the natural conditions and economic activity on a local drainage basin of the Cheboksary Reservoir (less the Oka Basin). The main principles of a new version of landscape-hydrological method used to evaluate nutrient runoff from the drainage basin into water bodies are given. The article presents the values of the runoff of these elements into the Cheboksary

AbstractPresent work aims to insight the influence of bedform transport on velocity power spectra of acoustic Doppler Velocimeter (ADV) in order to address different spectral sub-regimes. Laboratory experiments were conducted over two types of rough bed (d50 = 4 mm): (a) immobile rough bed and (b) mobile bedform. The near-bed spectral characteristics during bedform transport are compared with those

AbstractA method for constructing two-dimensional distribution law in a symmetrical case for three-parameter Kritskii and Menkel distribution is considered, and some results of the application of the model in applied hydrological studies are discussed. A system of orthogonal functions with a weight function in the form of a three-parameter gamma distribution is proposed to obtain linear correlation

AbstractThe oxygen regime of the channel flow of the small Maima River (Upper Ob basin) has been considered. A study of the spatial and seasonal variations of oxygen regime characteristics in the mouth part of the river and its tributaries has shown that they vary from their sources to the mouths. The effect of the industrial–residential agglomeration of Gorno-Altaisk on surface water quality in the

AbstractIn China’s Pearl River Delta, numerous sinkholes caused by excessive groundwater pumping from a karst aquifer have opened. These sinkholes can cause wells and springs to dry up, dwellings to be damaged, and can facilitate the entry of pollutants into the aquifer. Controlling drawdown and pumpage to prevent sinkhole collapse is important for the aquifer’s protection and sustainability. This

AbstractThe concentrations of the soluble forms of 41 elements were determined by mass spectrometry with inductively coupled plasma (ICP-MS) along with pH, Eh, and total dissolved solids in water of lakes and streams in the Kucherla River basin. The abundant rains, which enhance water exchange, along with meltwater from glaciers and snowfields are the governing factors in the dynamics of physicochemical

AbstractThe issues related to the assessment of the hydro morphological status of urban rivers in order to identify the revitalisation actions possible to be carried out, has been acquiring significant importance in recent years. The revitalisation of urban rivers and the waterfront urban space must be preceded by an assessment and determination of the direction of revitalisation measures necessary

AbstractThe considerable resources of thermal mineral water of the Paratunskoe Deposit are used in heating systems and balneology. The exhaust water enters a mud-bath water body as feed water. Of interest is the effect of chemical factors of thermal water on the ecological state of the silt sulfide therapeutic mud (peloid). The proportion of thermal water in the feed water of the lake reaches 40%.

AbstractFluvial erosion due to hydraulic force and bank failure under the influence of gravity are the two physical processes of riverbank erosion. This paper presents a new, simple, semi-analytical method to estimate the rate of fluvial erosion of non-cohesive riverbanks caused by hydraulic force. The derived equation is built based on the critical flow velocity concept, rather than the commonly used

AbstractThe concentration of microplastic particles (with size from 100 µm to 5 mm) and their chemistry were studied in water, subsoils and sediments in the coastal area of the Neva Bay, the Gulf of Finland. The characteristics determined in the study were the dominating shapes of the particles, their size range, polymer chemistry and concentrations in different media, i.e., in water, bottom sediments

AbstractThe study considers the methods for evaluating the maximal possible daily storm rainfall (MPR) in the Middle Ural based on a combination of ground, aerological, satellite, and radiolocation data. The methods under consideration represent an alternative to statistical estimation approaches. MPR is evaluated using the total moisture content of cloud systems, described in terms of their stationarity

AbstractCombined weir-gate structure is one of the important structures which are control the water level, measure discharge and avoid sediment deposition behind the weir. In this study, first try to simulate four combined triangular weir-rectangular gates with different geometric conditions via 3D numerical software (Flow-3D) by using experimental data. Then, dimensionless analyses were done to find

AbstractA unified concept of the elaboration of a water disposal system has been developed stage-by-stage for a large area in the central ecological zone of Baikal region with the use of a program–goal-oriented method. The volume of wastewater that will form in the region up to 2030 has been forecasted. Two technologies of wastewater biological treatment that are most efficient for Baikal region have

Data on the overgrowth level and biomass reserves in Volga reservoirs, collected in 2003–2009, are given. The long-term dynamics and the character of overgrowth of the Ivankovo, Uglich, Rybinsk, Gorki, Cheboksary, Kuibushev, Saratov, and Volgograd reservoirs are analyzed taking into account the published materials of the previous studies. The analyzed data include the specific features of variations

AbstractThe major shore-forming factors typical of Lake Baikal, the main types and subtypes of lake shore, and their current state are considered. The complex geological structure has determined the diversity of lake shore types. The identified types of shores are structural–abrasion, abrasion, accumulative, biogenic, and technogenic. Each shore type shows a specific response to the natural–technogenic

AbstractThe results of studies of water bodies in the Amur R. basin in 2011–2017 have been used to characterize the space and time variations of the concentrations of dissolved microelement forms. They have been found to vary widely in some areas, because of either the diverse natural conditions and the anthropogenic effect in areas near cities (Chita, Sretensk, Khabarovsk) and populated localities

AbstractThe results of long-term studies of a group of aufeis-forming Buluus groundwater sources are given. A stow, which has been formed by the spring, contains the drainage area of the suprapermafrost–intrapermafrost aquifer, which is widespread in the sand deposits of the bestyakhskaya terrace of the Lena River in Central Yakutia. The analysis of observations of 1964–2017 showed stable water chemistry

AbstractFirst data have been collected to characterize fluorine concentrations in the surface water of Bering Island (the Komandorskie Islands). The average fluorine concentration is 0.23 mg F/L with variations within the range of 0.08–0.42 mg F/L, which is ~2 times higher than the average fluorine concentration in world rivers (~0.1 mg F/L) but corresponds to its occurrence in rivers in the Russian

AbstractThe studies of seasonal variations of some hydrochemical water characteristics (salinity, oxygen content, temperature, pH, and Eh) and the state of brine shrimp population in the typical hypersaline Lake Oiburg (Shtormovoe Vil., Crimea) have clearly shown their dependence on weather conditions. Variations have been established in the population size of brine shrimp, their life stages in the

AbstractRegularities in the hydrogeochemical and geodynamic conditions were compared in the regions of the central West-Siberian megabasin, neighboring the Koltogorskaya–Tol’kinskaya suture zone. No regularities were shown to exist between the changes in groundwater chemistry and the tectonic conditions of the early period of basin development. The relatively recent or currently active tectonic processes

AbstractChannel braiding (separation of river flow into branches) is shown to take place at several structural levels: point, middle-bar, insular (channel), floodplain–channel, and floodplain. Full classification of channel braiding cases is given. The types of braiding are determined that form morphologically homogeneous segments and govern the channel regime of rivers and those that have been formed

AbstractThe relationships between various hydrological and morphometric characteristics of branch channels in the backwater zone are analyzed in the case of the Chilia channel system in the large nontidal Danube delta. This zone shows a stabilizing effect of the weakly varying Black Sea level. Criteria for determining the boundaries of this zone are discussed.

AbstractThe data of shipboard measurements of oxygen concentration at international monitoring stations in the Baltic Sea were used to assess the year-to-year variations of oxygen regime in the late XX–early XXI century (1989–2017). The obtained results were compared with similar studies in 1951–1988. The water areas with hypoxic conditions were found to increase as well as their vertical development

AbstractComparative analysis was carried out for some biochemical characteristics of the liver of Black Scorpionfish Scorpaena porcus Linnaeus, 1758, from Sevastopol water areas (the Black Sea) with different levels of integrated pollution. The concentration of the oxidized proteins , lipid peroxidation , and the activity of aminotransferases and alkaline phosphatase in the liver of black scorpionfish

AbstractIn the context of the environmental crisis observed in recent years in some areas in Baikal coastal zone, water chemistry was studied in June 2018 in seven points in this zone at different distances from populated localities and in six small tributaries of the lake. To compare data on different biological seasons lake water sampling was repeated in August–September 2019 in four previous and

AbstractA semianalytic and approximate analytical solution is given to the problem of slug test in a partially penetrating well in a confined or unconfined anisotropic aquifer. An asymptotic solution is given to the problem of slug test in a partially penetrating well in an unconfined aquifer. The latter solution, unlike the semiempiric Bouwer–Rice method, takes into account hydraulic conductivity

AbstractA characteristic feature of the Amur River is the frequent catastrophic floods, which cause considerable damage to the population and hamper economic activity. Statistical analysis of the maximal annual water levels in the Amur at Khabarovksk gage over the observation period since 1896 to 2016 gave analytical expressions for probability distribution functions of the general populations of water

AbstractArtificial recharge is an effective way to alleviate water shortages and excessive groundwater exploitation. In this study, to explore environmental changes of surface water and groundwater during multi-water-sources recharge process, numerical simulation method was applied. Local reclaimed water, treated by wetland, and water from the South-to-North Water Transfer Project (SNWTP) were used

AbstractNortheast China is an important food producing area because it contains large areas of organic soil. However, land degradation caused by soil erosion poses a serious threat to the soil conditions in this region. It is therefore crucial to explore the mechanisms behind the soil erosion and transport processes. This study assessed the effects of precipitation and vegetation cover variations on

AbstractAlgeria shares similarities with other countries of the world facing destructive floods. The need to understand changes in the intensity, frequency and severity of floods is critical for reducing significant social, economic, and environmental implications. In this study, flood indicators derived from annual maximum series and peak over threshold series were analyzed using Mann−Kendall trend

AbstractThe present study aimed to locate the areas prone to flood spreading in order to manage surface water resources. Therefore, the information layers of slope, land capability, quaternary units, alluvium thickness and land-use were applied in GIS environment. In this regard, the layers were rated in proportion to their effect on feeding of aquifer. Then, according to the Multi Class Maps model

AbstractThe article presents the results of adaptation and application of two-dimensional hydrodynamic model STREAM_2D to reproduce the characteristics of ice-jam-induced floods in the vicinity of the city of Velikiy Ustyug (the Northern Dvina river basin, Vologda region, Russia). The additional hydraulic resistance due to ice roughness and the decrease in the flow cross-section area due to ice-caused

AbstractAliphatic and polycyclic aromatic hydrocarbons have been studied in suspended matter and bottom sediments at the geochemical barrier the Northern Dvina–Dvina Bay during spring flood and low-water season. The increase in the concentrations during spring flood (for aliphatic hydrocarbons, on the average, 154 µg/L) compared with those during low-water season (on the average, 52 µg/L) has been

AbstractA system has been developed for diagnosing the biological production of lake ecosystems with input parameters: geographic latitude, specific watershed, normal annual air temperature, annual precipitation, mean and maximal depth of the water body, water residence time in it, and the values of water color index and daily assimilation number of phytoplankton chlorophyll a, averaged over vegetation

AbstractA cognitive model of optimal control of an ecological–socioeconomic system water body–watershed for the case of the White Sea (Beloe more) and its watershed (Belomor’e) is presented. The model includes parameters characterizing the climate, water and terrestrial systems of the sea and its watershed, the economics, fishery, agriculture, mineral resources, and the population. Cognitive modeling

AbstractLarge subsurface streams on steep slopes have stable positions with distinct catchment areas (drainage basins), linear shapes, and lengths of tens and hundreds meters. They form a closed drainage network with a role and scale similar to the primary hydrographic network and serve as specific hydrological objects—drains. Drains are widespread in the medium-height humid mountain zone, where they

The assessment of flood risk under climate change impacts is necessary for sustainable flood management strategies at national level. Referring to the aforesaid statement, this research aims to evaluate the potential impacts of climate change on reservoir operations in the Huong River Basin, Vietnam. To enable further representation of climate change impacts, the HadGEM3-RA Regional Climate Model (RCM)

AbstractSediment mobility in stream corroborates many significant mechanisms in terms of interactions of transported particles in the carrier fluid flows. In general, the sediment entrainment in stream refers to temporal and continual motion of non-cohesive grains. This phenomenon significantly influences the near-bed turbulent flow characteristics in streams. Laboratory experiments were conducted

AbstractThe study has been focused on the population composition dynamics and trophic relationships of Simocephalus vetulus (O.F. Müller, 1776) in the absence of the food stress of ichthyofauna in flow-through ecosystems in Patriarshie Prudy pond. The role of S. vetulus species in the plant-eating zooplankton, the suppression of blooming, and the preservation of high water transparency have been assessed

AbstractThe main components of the annual water and nutrient balance are determined for the basin of the Kud’ma River, which has a landscape structure typical of the southern part of the forest zone. The contribution of the natural and anthropogenic factors to nutrient inputs into the Kud’ma River and their export from the catchment area is estimated. It is shown that forest tree waste is among the