Abstract Regularities 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

Abstract Channel 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

Abstract The 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.

Abstract The 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

Abstract Comparative 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

Abstract In 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

Abstract A 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

Abstract A 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

Abstract Artificial 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

Abstract Northeast 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

Abstract Algeria 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

Abstract The 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

Abstract The 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

Abstract Aliphatic 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

Abstract A 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

Abstract A 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

Abstract Numerical calculations in DHI FEFLOW software environment were used to assess the effect of variably saturated zone parameters on capillary barrier formation. The sensitivity of the model to these parameters was analyzed, and the conditions of barrier degeneracy were given.

Abstract Groundwater resources are depleting at an alarming rate all over the world. Therefore, ensuring water security is the foremost priority of every nation. This paper presents a simple methodology to estimate groundwater recharge from rural ponds and to study the impact of climate change and urbanization on the recharge potential. It was found that built-up in the study area has increased by

Abstract Water in Central Asia is a precious resource in the semiarid and arid environments in which people live in the region. Understanding the groundwater quality is important as it is the main factor determining its suitability for drinking and agricultural purposes. This paper presents results of a groundwater hydrochemical assessment in the Herat City by measuring its physicochemical parameters:

Abstract A water resource allocation model coupling quantity and quality is a topic of concern in China. The water resources supply modelling is set up according to the water quality, and water quality has been emulated under the program of water resources allocation. It analysed the effect to water resources allocation which was caused by water quality and researched the technology of pollutants reduction