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The activity of drainage during various seasons and the impact of meteorological conditions on drainage runoff in different seasons (winter, spring, summer and autumn) during the period of 1969-2009 are reviewed. Particularly important indicator of drainage activity пїЅ dynamics of water runoff. The present article analyzes the change of climatic conditions in the object, Central Lithuania, following the data of Kaunas Meteorological Station; and it is determined that during the period of 1969-2009 the lowest quan...

In recent years Gda?sk had sustained economic and social losses due to severe flash floods coming down from moraine hills. The first flood occurred in July 2001 and the second in July 2016. Both events were caused by intense and long rainfall characterized by different from each other rain intensity in time. Among other GdanskпїЅs streams the Oliwski Stream has the most extended flood protection system consist of 15 small retention reservoirs. Due to its extensive flood protection system and lack of severe flood e...

Study case is situated in Caras Severin County. Every sediment transport model application is different both in terms of time and space scale, study objectives, required accuracy, allocated resources, background of the study team etc. For sediment transport modelling, it is necessary to know the characteristics of the sediment in the river bed. Therefore it is recommended to collect a number of bed sediment grap samples. These samples should be analyzed in terms of grain size distribution.To solve theoretical prob...

Maozhou watershed is a highly urbanized watersheds in southern China that is a typical watershed in ChinaпїЅs rapid urbanization. Changed land use/cover(LUC) within the watershed changed the flood response, that requires the model parameter updating with the LUC changes induced by urbanization to have an accurate flood forecasting. Flooding in Maozhou watershed is serious, which was aggravated by increased urban land area within the watershed. Accurately forecasting the flood of Maozhou watershed is imperative, bu...

The temperature of some surface and ground waters in Romania was measured during the 2015-2017 time interval at high temporal resolution in order to identify the main thermal properties and their oscillation. The water monitoring in B?ile Felix area was undertaken at Fp3 water well and Ochiul Mare Lake. The measuring sites in Geoagiu-B?i area are represented by water pumped from F3 water well and a thermal spring in Cibului Gorge. The outflowing groundwater from 2 water wells was measured in HпїЅr?ova area. In ord...

Genesis, transport and accumulation of settled sediments of mountain rivers are such random processes in time and space, which are defined by the river flow rate (Q m3/s?c), height of the basin (IпїЅ), the inclination of the river and basin geology. Genesis and the volume of river sediment is the function of the climate and, in accordance with its cycles, it increases during the warming period and decreases as the temperature falls. The main natural factors for sediment formation are the glacier, erosion, landslid...

Numerous past studies proved the potential of fluorescence spectroscopy to characterize aquatic organic matter and its link to function and chemical water quality. It was proposed as an optimum monitoring method due to its advantages, such as: rapid measurements, high sensitivity and selectivity, requires small quantities of sample with little or no sample preparation. Although fluorescence spectroscopy was used on different types of water systems, no complex study was undertaken to compare the fluorescence signal...

A mercury-cell chlor-alkali plant operated 50 years in KaпїЅtela Bay (situated in the middle of eastern Adriatic coast) near the town of Split. Even after 28 years the abundant cell house is still a hazardous source of the total gaseous mercury. Measured concentrations in the air (2.1 пїЅ 9.6 ?g m-3) could possibly present Hg-pollution of 9 km distant source of Jadro River. This source is used as a drinking water supply for the town of Split. The aim of the work was to find how far mercury is transported. Total me...

The paper aims to present the possibility of using surface water resource for irrigation in local arrangements in the West Plain of Romania. Irrigation is among the biggest consumers of freshwater worldwide and water demands for irrigation in Bega River basin are continuously increasing. On Bega River course, along with flood defense works, in the 1960 were also arranged water catchments with the role of using water in agriculture, even though most of arable land were arranged for drainage. To ensure the needed fl...

The paper is dedicated to the development of system of water objects pollution monitoring. An efficient study of the environment situation and giving appropriate solutions related to its improvement require adequate information, obtained from a large number of various parameters measurements. Conducting of analysis more than 3-4 times per day is more economically efficient if automatic systems for environment monitoring are used. Such system of water pollution monitoring proposed by authors consists of: computing ...

The paper discusses a comprehensive assessment of the ecological state of the basin of the transboundary Selenga River. This assessment was created on the basis of an analysis of the factors of direct and indirect effects on water bodies. The indicators used were grouped according to the types of anthropogenic influences - demographic, industrial and agricultural. The aggregate anthropogenic load was defined as the arithmetic average value of the points of demographic, industrial and agricultural loads. The result...

Lake Usma is unique with hundred years' old nature reserve and Natura 2000 territories in one part of the lake and developing the tourism industry in other part of the lake. During last ninety years, the water level of Lake Usma increased for approximately one meter, which caused coast erosion, changed soil ground water level in large territories around it and it is regarded to be a major factor for lake ecosystem functioning. To find sustainable management solution of Lake Usma, there is a necessity to understand...

The Danube, the second largest river in Europe, after its flow through many cities and countries, meets the Black Sea creating a meeting point which benefited the creation of the Danube Delta known as one of the greatest wetlands of the planet. The stretches of water and land of this delta offer good living conditions for many species of plants and animals. GIS technology is an important tool in the analysis of geographic areas. The purpose of this study was to create maps using a set of GIS technologies that pres...

An investigation of the effects of long-term drainage and restoration on the water table level and water chemistry was carried out within the area drained in 1975пїЅ1980 of Vasyugan Mire (Ob-Irtysh interstream area) with a pineпїЅshrubпїЅsphagnum community. The method of statistical analysis included estimation of time series and spectral analysis. In conditions of unsatisfactory operation of the drainage network, a comparative analysis of the data showed that average seasonal levels were close to natural conditio...

This study focuses on the analysis of the impact of land use changes on the flood regime in the Myjava River basin located in the Western Slovakia. The Myjava River basin has an area of 641.32 km2 and is typical for the formation of fast runoff processes, intensive soil erosion and muddy floods. The main factors responsible for the problems with flooding and soil erosion are location, geology, pedology, agricultural land use and cropping practices. A GIS-based spatially distributed WetSpa rainfall-runoff model was...

The generation and occurrence of surface runoff from a slope is driven by many factors, such as the slope gradient, the physical properties and current state of the soil, the type and density of the vegetation cover, and the intensity and duration of rainfall events. Within the study experiments with a rainfall simulator were focused on an analysis of the impact of a changing slope gradient on the generation of surface runoff and the amount of eroded soil material. The experiments were conducted in laboratory cond...

Within the global hydrological cycle, by redistributing the water masses, there are variations of the gravitational field as a result of changing the subsurface density and the atmospheric masses. For the use of gravimetric data in the hydro-geological modeling it is necessary to correct the direct and indirect effect of gravity due to the altitudes at each point on the topographic surface. Also, based on the variation of the gravitational field according to the selected time intervals (monthly, seasonal, yearly),...

The concept of sustainable development has an increasing influence on the implementation of innovative solutions processes. On the other hand, technologies are an important factor driving development, not only economic but also social and ecological. The aim of the article is to present the importance of the creative process during implementation of geothermal water deironing technology for sustainable development. There are many water deironing technologies available on the market. However, only a few of them are...

The purpose of this study was to identify the factors of influence in alluvial deposits due to the anchoring of barges in the vicinity of river ports. The problem of analysis was identified at the anchorage of the barges near the Galati Mineral Harbor on the Danube River. The area of the navigable channel located downstream of the mineral port is affected by alluvial deposits. Major problems occur in the summer months, when Danube waters are very low. Analysis of these issues was done with the SolidWorks Flow modu...

Two identical hollow fibre membranes used for ultrafiltration as prefiltration stage of water drinking treatment were tested for assessing the efficiency of cleaning, by using hydrodynamic cavitation. Each membrane with outside-in permeate flow direction, and the same molecular weight cut-off (0.097 m) was placed vertically inside glass cylinders. One hollow fiber membrane was subjected tohydrodynamic cavitation and cavitation during backlfushing. For the other membrane no treatment was provided for comparison rea...

Thermal pollution is considered to be one of the physical water pollution types that is caused by dumping of water heated by the units of industrial, thermoelectric and nuclear power stations. This type of pollution is characterised by the increase of water temperature higher than the natural level. At the places where heated water is dumped there are zones with water temperature higher than in the whole reservoir: about + 12пїЅ ? in winter and + 30пїЅ ? in summer. This fact results into the increased amount of or...

The main purpose of this work was to determine the influence of type of sampling container on a chemical composition changes of geothermal water. Current research conducted on a bottled waters indicated that, from the vessel walls to water stored in a bottle are transferred various pollutants, mainly the elements such as: arsenic, chromium and antimony [1-3]. Waters with a natural high temperature can intensify mentioned process. The experiment was conducted on the samples of geothermal water collected from the PG...

For a long time, coal mining in the Eastern Donbass was the most powerful factor affecting the natural environment. The most significant were the natural underground and surface waters. Their pollution was due to mixing with highly mineralized man-made mine waters, which seeped through the rock mass, polluting the underground hydrosphere, and at the same time, as a result of pumping out of mines, fell into rivers. As a result of the closure of most coal mines in the region in the 1990s, the processes of hydrospher...

The need to improve the quality of water in the metropolitan area Galati-Braila is the direct result of RomaniaпїЅs engagement to comply with the European legislation regarding the continuous monitoring of water quality through the permanent control of the bacterial and physical-chemical parameters, not only in the water destined for human consumption, but also in the water drained in the rivers of the region. The water needed for the urban area Galati-Braila comes from the Danube, and in this geographical segment...

In recent years the small hydrographical basins were affected by numerous extreme hydrological events. Genesis of floods from these hydrographical basins is linked primarily by climatic conditions and other factors such as: geology, soil by its temperature and its humidity, vegetation, topography trough slopes, shape and surface of the hydrographical basin, which influence the concentration time and water volume. Mike She model is able to simulate the entire stream flow. This paper is using Mike She Model for runo...

An important feature of the small rivers in the fact that they are the starting point of the river network, and any changes that occur in their mode, will marked on the hydrological chain. Small rivers form the water resources of medium and large rivers, hydrochemical water quality and creating lands large areas. Object is a small river Mertvovod in Mykolaiv region (Ukraine). Purpose is an environmental analysis of the state of the Mertvovod River, to determine and analyze possible impacts on the state of the wate...

Since the beginning of widespread use of plastic its consumption and production has been constantly increasing. As a result of human activity part of waste ends up in our environment and is deposited in each of the elements of the biosphere. These impurities can be in the form of large elements, small particles fragmented to macroscopic level (pellets, facial scrub grains) and the microparticles visible under a microscope. Particularly harmful for the environment are microplastic particles, which can be deposited ...

The periods with precipitations surplus represent a risk that usually has a local prevalence, unlike the periods with precipitations deficit, where the areal spread is large, and the onset and evolution are slow. The perception in the case of periods with pluviometric surplus is that of a major hydrological risk, because of the violent and progressive way of manifestation, while droughts are perceived as being less dangerous phenomena. Among the pluviometric parameters that visibly influence the precipitations reg...

The river monitoring activity from the territory of the Banat hydrographic space which is situated in south-western part of Romania started in the 19th century, when the achievement of drainage works were started, of great amplitude, in the subsidence area of the Western Field, where there several swamps and frequent floods took place, and when several hydrotechnical works were performed, based on studies and projects, for which several observations and hydrological measurement where necessary. The occurrence of t...

The chemical composition was assessed and the trends of spatial and temporal variability of river water quality in the Tuzlov and Seversky Donets basins which are main waterways of the Eastern Donbas (the west of the Rostov region, Russian Federation) were identified. River waters have a neutral or slightly alkaline reaction, are saturated with oxygen, and are characterized by high sulfate content and high mineralization (up to 6.8 g /dm3). Based on the results of the comprehensive assessment, the water quality of...

Fractal geometry in recent years became an useful tool used in many scientific fields. One of the directions of development of that tool was also an attempt as using it for describing the morphology and granulometry of solid phase contained in various suspensions. The solid phase can come from different sources, such as municipal process (e.g. water treatment) or industrial process (e.g. metallurgy/steel industry or mineral processing). Suspensions on which one can come across in industry tend to be grainy and the...

It is rather difficult to apply thermodynamic simulation in the forecast of heavy metals migration in aquatic ecosystems due to the fact that the composition of bottom sediments in reservoirs is very changeable and uncertain. An alternative approach is proposed for solving similar problems based on the use of empirical information on heavy metal speciation in bottom sediments. This type of information can be obtained using sequential extraction scheme (for example Tessier scheme). Based on these data, effective th...

The use of magnetic susceptibility data in order to determine the lithology of river and lakes deposits has become an efficient and rapid method of analyzing sedimentary material. This paper aims to achieve both a more accurate determination of sediment lithology based on the study of the magnetic susceptibility of the cores extracted from the bottom of the rivers, as well as the rate of deposition. The sediment lithology and the deposition rate represent the most important information for the characterization of ...

Speciation of heavy metals in bottom sediments defines their ecotoxicity and mobility and therefore needs to be studied thoroughly. Usually single and sequential extraction techniques are used to determine water-soluble, exchangeable, specifically sorbed and carbonates, bound to organic matter, bound to Fe and Mn hydroxides and residual forms. Bottom sediments of the Vyshnevolotsky reservoir (the Upper Volga, the Central region of Russia) were chosen for the research. Lithological and mineral composition of sample...

The paper presents a proposal for validation of a numerical model of a sedimentation process with use of a flow system. The essence of the proposed solution is to verify the numerical model using quantitative data, expressed by the flow rate and concentration of the suspension at the input and output of the device, as well as the qualitative data describing their granulometric composition. The analysis was carried out using a laboratory settler, as a sedimentation device, in which, during the purification process ...

The upper part of the Tatarstan Republic section is complexed by sedimentary of multi facies complexes of Middle Upper Permian, Mesozoic and Pliocene-Quaternary rocks. The surface and ground water are characterized by a wide variability in composition, mineralization, water hardness and other parameters. These variations are determined by a complex of natural and technogenic factors. The most important natural factor is interaction of the atmospheric precipitation and their derivates with soils and rocks of the se...

This study presents the evolution of residual chlorine concentration in the water distribution network for a town with 10 000 inhabitants. The distribution system consists of a tank, pump station, 41 loops, 175 junctions and 166 pipes. The paper presents also a methodology for computing the residual chlorine concentration decay in water distribution system, over a 7 days period of time. Chlorine is injected at the tank, with a constant concentration of 0.5 mg/l. A variable water demand over a 168 hours period is i...

The biggest river in the Kosovo area is White Drin. Last 60-ty years, in Kosovo, three state power has been changed, therefore we have observation of hydro-meteorological data, of three stages. Those data are not complete. There are two serious water resources master plans, of year 1983 and of 2008, but both have used data of period 1952-1986. The idea of this article, is to complete, calibrate and to validate existing data, of daily average flows, until today, in order to study water regime of White Drin river, f...

The basic stage of the modern approach to calculation of a wind wave climate (long-term probability) includes the database formation using numerical hydrodynamic models. The input to such models is atmospheric pressure or wind velocity at some height over sea surface. This information extracted from the reanalysis data. Initially reanalysis intended for research of global processes without description of the extreme phenomena. For this reason, for calculations of a wave climate the reanalysis data have to be corre...