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In order to properly manage water resources in a river basin, it is necessary to identify trends in the evolution of rivers flow. Long-term trends analysis for river flow in north eastern part of Romania is based on two different methods: non-parametric rank-based Mann?Kendall (MK) test and innovative trend analysis (ITA). These two methods were applied for 7 hydrometric stations located in river basins unaffected by hydro-technical works, with hydrological observations on the average flow for the period 1950-2017...

Determination of the maximal run off in the constantly changing urbanized territory often is very different compare to the natural conditions. There are many approaches to reflect the new conditions of flows formation including the extremes. Sometimes the level of urbanization is so quick that the conditions of flows formation could be altered in the frame of several years. The determination of the maximum flows is additionally complicated in case there is not a suitable hydrological monitoring network or a lack o...

The cartographic presentation of objects and phenomena of the real world requires their digital transformation. Space and geoinformation technologies are successfully used for the digital presentation of information about the state of spatial objects. This article describes the technology of digital processing medium resolution images, which ensures updating the vector contours of the coastline of water bodies in the territory being mapped using satellite data. The technology involves the following stages of image...

Ascent and submersion of algae depends on their density. As a result, algae find themselves in different conditions for solar radiation and temperature. The paper represents model of algae concentration during vegetative period both in upper mixed layer and in bottom layer for three types of algae depending on density. The model is based on research of water samples from various horizons obtained in the Gorky reservoir from 2014 to 2019. Samples were examined for the presence of algae using a microscope equipped w...

The hydrological processes are very complex and the hydrological and hydraulic models are the main components of the flood forecasting and warning systems. They identify the dominant hydrological processes which influence water balance and result in conditions of extreme hydrological events. A variety of hydrological models exist nowadays. In this study the physically-based, fully distributed hydrological TOPKAPI (TOPographic Kinematic APproximation and Integration) model was applied on Aytoska river catchment. Th...

In thisstudy, the influence factor of the vertical movements of the earth's crust was taken into account. Such phenomena are strongly extended in time, but have a greater influence on the hydrographic network, for example, the closest example for the North-West of the Russian Plain is the transfer of runoff from Lake Ladoga from the Vuoksa River to the Neva River. Reconstruction scenarios of flow direction changing is important to improve the safety of the population and sustainable use of territories. The most im...

The climate in Latvia is moderately warm and humid. To provide optimal groundwater heads (levels) for plant and tree growth, agricultural and forest melioration systems (AMS and FMS) have been set up in many places. Reconstruction of the FMS ?Zamelu-Tisu mezs? will be carried out. To assess the reconstruction impact, hydrogeological and hydrological conditions in and around the FMS territory were studied. To accomplish this task, specialists of Riga Technical University for the study area developed and used the lo...

The research focused on hygienic assessment of surface and underground water sources used for centralized drinking water supply to RF population over the last 20 years. Official statistic data collected on sanitary situation in RF regions by Rosstat over 2000-2019 were used as a basic source of information. A database has been created; it contains more than 165 thousand data entries on 16 parameters describing surface and underground water sources used for centralized drinking water supply to population in 85 RF r...

The paper presents a synthesis of our researches on the main physic - chemical and biological parameters of the Snagov Lake, from Ilfov County, Romania, made since 2013 until 2019. We have developed complex investigations on the most important water quality parameters of the lake, in the purpose of analyze the evolution of the water eutrophication phenomenon in time, in different sampling points, also to establish the optimal methods of control and combat of the studied pollution process. Because the eutrophicatio...

Water purification is one of the most urgent tasks for solving global problems of fresh water supply and ecology. Special attention is paid to nanoporous membranes, which can be used to purify water from most of the pollutants, such as metal ions, organic molecules, salts and microbes. The development of highly effective nanoporous membranes for water purification is an extremely urgent task. Nanofiltration membranes made from 2D nanomaterials have a huge potential in desalting and purifying to the characteristics...

Recently, zeolites have attracted a significant interest due to their potential use in a wide range of applications related to water treatment and environmental remediation. The chemical and thermal treatments are the most used approaches to improve the zeolites properties by enhancement of sorption properties, surface area and porosity. Chemical (2M NaCl), thermal (150 °C for 24 h) and thermo-chemical (2M NaCl, 150 °C for 24 h) activation methods for a natural clinoptilolite based zeolite originated from Romania ...

Introduction. Arsenic is one of the most toxic elements, discovered on the Earth, and poses a very serious threat to human health and life. Aim of the work ? assessment of risk to the population health of the natural area in the eastern part of Russia, caused by the use of drinking water containing arsenic. Materials and Methods. The population of one of the provinces of Eastern Siberia, characterized by an increased content of arsenic in water (147 people) was examined. Examination included: determination of As c...

The management of protected territories in Bulgaria is a subject to the Bulgarian and European environmental legislation. The used plans for management provide basic information on the condition of abiotic and biotic components of the natural environment in the protected territories and Guidelines for their management, control and conservation. The water resources with their specificity and dynamics of alteration are a major abiotic component that impacts on functioning, development and conservation of ecosystems ...

Drinking water is one of the critical resources, but still not accessible to everyone. In case of a crisis event, this state can even worsen depending on the manner of the crisis event. Therefore, it is important to protect drinking water resources and monitor activities that can threaten the safety of drinking water e. g. industrial, agricultural activities, building of technical infrastructure or insufficient management of water facilities etc. Although there has not been in-depth research, there is evidence of ...

By building artificial landscape elements, significant changes occur in the spatial structure of the city. The intensification of the formation of paved surface changes the hydrological characteristics of the area. Impermeable surface prevents the penetration of atmospheric waters into the soil horizon, which causes an increase in the volume of runoff, flood peak, and pollution loads in urban stormwater. As a consequence of this phenomenon, during heavy rains, a critical part of the city may be flooded. To reduce ...

Water crises have become more and more frequent in recent years. In fact, the ongoing climate changes have led very often to periods of drought, which, together with the increasing of groundwater exploitation, leads to a depletion of thess resources, which are fundamental for human life. Most of the most important springs, in the world, are located in karst areas. Specifically, for a large part of the Mediterranean region, karst springs play an essential role in water supply systems. The quantitative analysis of k...

With the economic development of the European seas and rivers, there was a sharp increase in demand for services and transport. Maritime transport is one of the least expensive methods of transport, unlike road, rail or air transport and has a number of advantages in terms of the size of the goods transported and the increased safety of freight transport. Many of the sea routes have among their destinations river ports, which hold a large part of the year traffic of ships. In the European waters we find a diversit...

Stormwater presents a significant problem in urban areas, especially in large cities. The intensified formation of impermeable surface leads to suppressing permeable-vegetation areas and, subsequently, substantial changes in the area's hydrological, environmental, and ecological characteristics. By changing the city's spatial structure, there may be an increase in flood peak, volume of runoff, and rising pollution in urban stormwater. As a result of this phenomenon, the aquatic environment can be degraded by chang...

Saline lakes located on the territory of Kulunda lowlands with semi-arid climate are unique ecosystems, geochemical features of which are constantly under the pressure of intense evaporation. Their hydrological and chemical balance, however, strongly depend on inflow from rainfalls, groundwaters and rivers. Surface and groundwaters of Kulunda lowland are formed under the influence of soda salinization and are characterized by an alkaline environment. The salinity often exceeds 1 g/L and can reach 2.5 g/L. Major io...

Anthropogenic activities disrupt hydrological regime (e.g. lake water level, river flow), and water quality changes due to pollution and affect ecosystems by disrupting the cycles of substances and water cycle. The composition of natural surface waters can be altered for a many reasons, for instance climatic, geographic as well as anthropogenic. Agriculture depends on a use of fertilizers, a use of pesticides, and a transport which turn agricultural land into a nonpoint source of surface water pollution. The agglo...

The paper applies the concept of bankfull discharge for a mountainous anthropized (both in terms of channel, floodplain, and catchment) river: Bistricioara river, Eastern Carpathians, Romania. A review of the literature is done, and several methods are chosen, both based on gauge data and on fieldwork measurements: discharge frequency, hydraulic geometry, and the Gauckler?Manning formula. The resulting discharges are compared to the historical gauge data and are correlated to the long-term channel topography varia...

The majority of the rivers in Kazakhstan can be characterized as plain and lowland type. The flow in such rivers is uneven both within the year and over the years. In order to regulate this variability, to conserve water resources as well as to provide water for domestic use the reservoirs have been built. In Kazakhstan, there are 43 large on stream and valley reservoirs on 33 rivers, half of which are on plain, lowland rivers. One of such reservoirs, Astana reservoir is studied in this paper. It is situated on th...

The evaluation of organoleptic parameters of Adjara Coastline Waters of the Black Sea Basin is carried, their multi-element composition is identified. The organoleptic and toxicological parameters of Clupea harengus and Trachurus mediterraneus inhabiting in these waters are determined. The research subjects are the waters of coastline of River Chorokhi confluence at the Black Sea and deep waters of the same location (Gonio Settlement, Active fishing zone) where research materials were taken from. According to rese...

Climatic conditions have significantly changed over the last decades. In the middle latitude, the annual precipitation total does not change significantly, but precipitation is unevenly distributed throughout the year. The aim of the research is to investigate the effects of climatic conditions on the dendrological changes of the Royal walnut (Juglans Regia L. var. Chandler) in the period from July to November 2020 in the conditions of the middle latitude of southern Slovakia. This area is characterized by intensi...

As a result of increasing concentrations of total nitrogen and total phosphorus, surface water chemical pollution and eutrophication is a problem of raising concern worldwide. Chemical quality of surface water gives an impression about different geochemical, geological, hydrological and biological processes, as well as intensity of anthropogenic load in river catchment area. The total length of Svete River is 123 kilometres, of which 75 kilometres are in the territory of Latvia. Main part of river?s drainage basin...

The article analyses geological, climatic, hydrological conditions of formation of the unique thermal regime of the nonfreezing river Ilet and its right tributary Yushoot, located mainly on the territory of the national park Mary Chodra of the republic of Mary El, RF. For a number of years the hydrological character of these rivers, their water and speed rate have been researched, with special attention paid to numerous underground sources of water, their chemical composition and temperature. The flow rate of the ...

The article analyses the current state of flood protection of the urban area in the foothill region. Problems of the area were characterized through selected critical points that support the local flood origination. Of course, the flood is a random phenomenon and its behaviour depends on many other factors, such as soil saturation, vegetation cover, river bed channel current state, as well as drainage cuts, soil management, etc. For efficient design of the flood protection measures, it is necessary to have input d...

Zooplankton organisms are widely used as indicators of ecosystem changes (Adrian et al., 2009, Nigamatzyanova G., Frolova L., 2017). Both zooplankton and nutrients play an important role in monitoring and assessing water quality by greatly contributing to biological productivity (Vinberg,1960). In the current study, we examined water quality of different types of water bodies of Ob and Erkuta river basins, based on the analysis of zooplankton communities and the concentration of nutrients. 72 species of zooplankto...

Objects of geological heritage of international level are located in the Nizhny Novgorod region. This is the Puchezh-Katunki impact crater of an early Jurassic age, the Bathonian-Callovian deposits of the Jurassic system near the settlement of Prosek on the banks of the Volga and karst lakes and caves in the basin of Pyana and Tyosha rivers. A water induced risk assessment was carried out to include it in application for aspiring UNESCO Geoparks network. The assessment includes the risk of landslides, abrasion of ...

Monitoring progress in the water sector requires an interdisciplinary approach and involves quantitative and qualitative assessment. This need must be integrated in such a way as to allow the solution of a wide range of tasks. In addition, the process should allow the inclusion of views and evaluations of water users. To evaluate the progress of a municipality, country or region, it is necessary to build a monitoring system based on simplified indicators. In this context, the purpose of this publication is to adap...

The elements content (Fe, Mn, Al, Zn, Cu, Cr, Pb, Ni, Cd, Ba, Sr, V) in the tissues of fish (muscles, liver, gills) of various trophic level (bream (Abramis brama) and a pike perch (Zander lucioperca) from the Sheshma River (the Middle Volga Region, Russia) is given. A lot of different technologies, including solvent cyclic steam-assisted gravity drainage and cyclic steam stimulation, are used for oil production in the catchment area of the Sheshma River. It was shown that both species of fish accumulated Pb (musc...

The establishment of a special regime of nature management in the Baikal natural territory is the main form of organization of environmental activities and state regulation of the water bodies quality in the Baikal region. At the same time, the rationing of admissible impacts on the ecosystem of Lake Baikal is the main tool for regulating economic and other activities. The implementation of increased requirements in terms of guaranteed preservation of the Lake Baikal water quality was carried out in the period 196...

The article deals with the analysis of the filling quantity of the available soil water storage (in depth of 0 ? 30 cm) on the protected soil resources only in arable land of the Zitava river catchment (Slovakia). The filling quantity of available soil water storage is expressed by the ratio between the currently available soil water storage and the potentially available soil water storage. The filling quantity of available soil water storage in protected soil resources in the territory was analysed in two years, ...

The paper treats the problem of water eutrophication for hilly lakes. Water quality monitoring evaluates the physical, chemical, biological and bacteriological parameters of the water in relation with ecological conditions of the environment and of human health. Our researches followed the evolution of the ecological potential and the chemical state of the water between 2014 and 2018. It was defined the concept of eutrophication for hilly lakes water, it have been established the causes of this process, and it was...

Damaging changes of landscape and interventions in the water cycle caused mainly in the last century in Czechia together with climate changes are the cause of more frequent occurrences of hydrological extremes. Recent years we have solved a lot of the drought related problem, but on the other hand, we cannot forget to the problem of extreme floods. For example, the recent regional floods in Czechia from 1997, 2002, 2009, 2010 and 2013 or the flash floods occurring every year. In these consequences developing metho...

In order to erect an underground construction, it is necessary to drain its trench by pumping out groundwater. If information on hydrogeological data of the place and on the trench are available then it is possible to estimate, by using modelling, the necessary pumping rate and to compute lowering of groundwater head at the trench surroundings (depression cone) developed by the pumping. There ground dewatering happens that may cause subsidence of buildings and streets and to worsen life of plants. For this reason,...

The seismic hazard studies of the last 30 years have been largely carried out taking into account the needs of the construction engineers, by linking the specific quantities of soil movement with the physical parameters determined instrumentally, namely, with the maximum values of soil acceleration. At present, interest in the results of hazard studies has increased and has extended to other areas such as insurance or design companies, environmental protection, etc. A fundamental element in the estimation of seism...

The Kupa River, located in the west-central part of Croatia, is a 294 km long tributary of the Sava River, belonging to the Danube watershed. An extreme barium anomaly in sediments of Kupica and Kupa rivers was discovered during 2003 by Franciskovic-Bilinski. It originates from an abundant barite mine in Homer-Lokve area, from where it penetrated to Kupica River source. From there the Ba-anomaly in sediments was followed more than 120 km downstream along both rivers. This discovery has a big potential to be used i...

Rapid urbanization encourages the transformation of natural zones into impermeable zones. Because of that, increasing in runoff and decreasing in water quality from urban areas have been appeared. As a solution of these problems, a plenty of technologies related to the stormwater management in urban areas have been developed. The main aim of these technologies is to minimize the environmental degradation. One of the developed solutions is Low Impact Development (LID) technology, which combines measures for polluti...

Computer technology for Arctic seas water masses analysis is presented. It facilitates data obtained both as remote sensing and in situ. Modern methods and software tools are described as parts of detailed technology in case of one spatial distribution assigned to particular time stamp map and time series of them. Open data from MODIS Aqua satellite project and expeditions listed in World Ocean Database are treated with open source programming tools (R/Python software stacks). Sea surface temperature analysis is c...

Wastewater treatment plants produce large quantities of sludge. Sludge originates from different stages of treatment and typically contains elevated levels of heavy metals, a large number of organic compounds and potentially pathogenic organisms. Considering the recent increased environmental concern, the authorities and the water utilities are facing strong demands for the safe disposal of the sludge. A good management plan regarding water treatment residuals should take into consideration the following aspects: ...

The adverse effects of nutrient enrichment of surface waters, ?aquatic eutrophication?, have been identified as a major environmental issue at national and international levels. A range of statutory and international commitments, including EC Directives, the OSPAR Convention and the UK Biodiversity Action Plan, requires action to be taken to address the threats to the quality, ecology and uses of our waters. However, while these initiatives are helpful in controlling eutrophication, each addresses certain parts of...

Since the 1980s, intensive anthropogenic disturbances have affected the channel of the St. George branch that is the southern distributary of the Danube River. The meander cutoff programme since 1984?1992 induced different hydro-morpho-sedimentary impacts on the local distribution of river flow velocities, discharge, and sediment fluxes between the former meanders and the man-made canals [1]. These cut-offs lead to a shortening of the distributary by about 31 km and, consequently, increased the free water surface ...

It is important to gain a better understanding regarding the effect of frequent drought stress on biochemical and physiological processes in plants as well as on the plant population and community in ecosystem. One method of early detection and monitoring of water stress is by measuring the diameter changes of the stem using dendrometers. They can be used to determine not only the annual thickness growth, but also the distribution of the growth and the rate of expansion and shrinkage of the wood and bark during th...

In case of the strong earthquake offshore Japan, tsunami wave approaches the nearest coast in approximately 20 minutes. So, time required for evaluation of tsunami danger is the key parameter for any warning system. The authors propose to determine the parameters of initial sea surface displacement at tsunami source (initial data to simulate numerically wave propagation) by a part of the measured tsunami wave time series until the first maximum. This is a clear and easy to apply stop criterium. Determination of th...

The effectiveness of hydrological models application depends immensely on exact knowledge of parameters included in these models. Their experimental determination is often difficult and costly task. The alternative to experimental measurement of these parameters is inverse modeling when sought-in parameters are determined as a result of comparison of modeled and observed values of some physical quantities . It is assumed that the experimental determination of these quantities is not difficult. In this article, wit...

The organization of a closed cycle of water use is one of the priorities for both recycling water supply systems and wastewater treatment systems of industrial enterprises. Water cooling systems are considered and the possibility of closed water cycle organization is estimated. For cooling systems of circulating water supply of industrial enterprises, depending on the water content, the cooling scheme can be: running, open (evaporative cooling) and close. The technological scheme of water treatment based on the co...

Climate-change scenarios all around the world indicate that many areas of the globe will increase in aridity. Plants need a large amount of water and nutrients throughout their life cycle and all aspects of plant development are affected by a reduction in water content in the soil. This reduction in soil moisture leads to changes in the physical environment, which subsequently affect physiological and biochemical processes in plants. Based on sap flow measurements, it is possible to optimize irrigation. For our ex...

Assessment of spatial and temporal distribution of groundwater recharge is critical for long-term water resource management and planning. The spatial distribution of groundwater recharge depends on the climate conditions, topography, slope, soil textural, land cover, and distributed groundwater depth. In this paper, the monthly steady-state water balance model, WetSpass-M, was applied to estimate the groundwater recharge in the Cun-Szaporca oxbow of Drava floodplain, Hungary. The model inputs data are prepared in ...

Climate change exerts influence on water resources and runoff directly ? by altering natural factors (precipitation, temperature, evapotranspiration) and indirectly ? by induced as a result of climate change land use alterations (forests, wetlands, etc.). The report presents the methodological approach for estimation of the cumulative impact of both climate and land use changes on the availability of water resources. For calculation of water balance a Model of monthly water balance, created in the United States Ge...