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Since ancient times, mankind has tried to establish a causality of the phenomena that occur in the surrounding world, to find solutions and answers. Floods are widespread in the Danube Delta they cause great material damage and loss of human life and important consequences. The production of floods in the Danube Delta is due to the entry into the Danube of large amounts of water from rains, from the sudden melting of snow and mountain glaciers, as well as from underground water sheets. Deforestation favors the rap...

Climate factors are already exerting negative pressure on water resources, society and ecosystems. The analysis of trends and identification of vulnerable water supply areas is related to the River Basin Management Plans. For this end, a methodology for assessment of water resources vulnerability, developed in international projects of the National Institute of Meteorology and Hydrology (NIMH), is adapted. The methodology is further developed by drought risk assessment. The main stages are: 1) Assessment of the cl...

Lake Brates is located near Galati city, in the south-eastern part of Romania being one of the largest lakes in the country. Unfortunately, water quality has greatly decreased in recent years, both due to human actions and to climate change. The present paper aims at establishing the quality of the water in Lake Brates as resulted from the calculation of the water quality index (WQI) by the weighted arithmetic method. In order to calculate this index, several sampling campaigns were carried out in various points o...

Estimation of floods is of extreme importance in designing hydraulic structures and systems, as well as in flood management, including ecosystem recovery. Accurate derivation of flood hydrographs in ungauged basins has additional challenges. The aim of this paper is to estimate flood hydrographs with different return periods using a semidistributed hydrological model, in the ungauged River basin of Benca, Albania. Benca River is part of Vjosa River, which is considered the last wild river of Europe. A frequency an...

The results of the study of the dynamics of changes in the territory of the Kakhovka reservoir before and after the explosion of the dam on June 6, 2023 are presented. This led to the destruction of the Kakhovka reservoir and the sharp flooding of significant areas downstream of the Dnieper River, including the delta. The analysis was carried out on two indicators: the water surface area and the water level. As a result of the analysis of space images, it was found that the area of the Kakhovka reservoir decreased...

Water transport in icy environments necessitates specialized infrastructure to facilitate safe and efficient movement. Ice piers, vital components in these regions, serve as critical pathways over frozen water bodies, enabling the traversal of ships and vessels. This overview encapsulates the scientific exploration of ice piers, focusing on their design, construction, functionality, and the advancements revolutionizing water transport in challenging icy terrains. The design of ice piers requires a holistic approac...

Water transport in icy conditions presents intricate challenges that significantly impact navigability, safety, and operational efficiency. This article delves into the complexities of navigating icy waters, focusing on the diverse forms and compositions of ice that pose formidable obstacles to maritime operations. Pack ice, icebergs, and frazil ice represent distinct challenges, restricting access, threatening safety, and impeding the fluidity of water transport routes. The challenges for water transport in icy c...

Water and sediments in coastal areas interact at different scales, thus shaping the marine environment and providing physical habitat for ecosystems. Hence, the hydromorphological conditions represent a key aspect of aquatic ecosystems considered in the Water Framework Directive as supporting quality elements (alongside the physicochemical), which are expected to provide the boundary conditions for the biological quality elements. Any alteration in those can reshape the corresponding biological conditions at vario...

Since putting in operation of Chernomorets fishing port (Sozopol municipality, southern Bulgarian Black Sea coast) in January 2016, a number of negative effects have been observed in the area. The disturbance in the existing hydrodynamic balance led to intense coastal erosion and unwanted sand accumulation in the wave shadow area. Additionally, the coastal water quality has deteriorated in the port area. In order to undertake measures to mitigate the observed adverse effects, it is necessary to assess in detail th...

The study presents results and discuss statistical properties of wind-generated sea waves measured in transitional waters of the Burgas Bay at the Bulgarian Black Sea. Wave measurements were acquired by Acoustic Doppler Current Profiler at two locations offshore Kraymorie and Chernomorets at water depths of approx. 15 m and 18 m, respectively. At each location, data were recorded for about three and a half months in winter seasons of 2021-2022 in front of Chernomorets and in 2022-2023 offshore Kraymorie, when stor...

The Danube Delta is a wetland of global importance, providing several ecosystem services. The sustainable development (i.e., economic, social and environmental) in the area depends on the health, quality and quantity of the natural resources. Water is one of the most important resources. Largely, the Danube Delta, which receives the input of water and sediment flux from the Danube River, gathered form its entire basin, may experiences lower water quality due to natural and anthropogenic factors, from basin to loca...

In recent decades, small domestic wastewater treatment plants have become popular in rural areas of the Slovak Republic. The reason for the expansion of decentralized wastewater management is that many rural areas have scattered settlements, and a centralized wastewater disposal system is economically, technically demanding, and inefficient. The disadvantage of using small domestic treatment plants in terms of environmental protection is that these facilities have yet to be significantly monitored. Due to improper...

Knowledge of the coastal hydrodynamics, in particular the storm induced waves, is essential for management of the extremely vulnerable coastal environment. There, wave processes dominate surge, coastal currents, sediment transport and species distribution. Therefore, it is important to have a detailed insight into the exposure of different coastal areas to wave action. The study proposes a wave exposure classification of the Bulgarian Black Sea coast according to wave climate conditions as required by the Water Fr...

Water pollution and climate change are two of the most pressing environmental challenges of our time, and their interconnection is increasingly evident. Water pollution and climate change are interconnected in various ways. The release of greenhouse gases, primarily carbon dioxide, methane, and nitrous oxide, is a significant driver of global warming. These gases contribute to the greenhouse effect, leading to rising global temperatures, which, in turn, affect water resources. Warmer temperatures exacerbate water ...

The article discusses the efficiency of vertical subsurface flow filters in wastewater treatment wetlands, where the main filtration layer is composed of recycled aggregates. To determine the efficiency of the vertical filter using modified recycled aggregates, three test columns were created. The first column contained natural gravels, while the second and third columns used masonry (RMA) and concrete aggregates (RCA). The test filters were loaded with wastewater from a combined sewer system, with non-dissolved s...