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Drought indicator systems help decision-makers to understand how and where the drought occurred and to take measures from the Drought Management Plans. The main goal in the Water Framework Directive (WFD) is the achievement -good ecological status-, but the Article 4.6 allows temporary deterioration of the status, occurred as a result of so called -prolonged drought-. Reduction of natural water resources such as rivers, lakes, aquifers, is associated with the reduction in available water resources for water supply...

The theoretical model of perfect business competition is designed based on five assumptions: atomicity of demand and supply, homogeneity of the product, free entry/exit in/from a branch of activity or on/from the market, market transparency, (with the fundamental assumption of the individual's rationality) and perfect mobility of production factors [1], [2]. The factorial analysis carried out for an economic agent from an Eastern European country highlighted the fact that the production function is homogeneous. Fo...

In recent years, natural wastewater treatment wetland plants have been gaining more attention from researchers and the public due to their low operating costs and efficient way of treating wastewater. Treatment wetland plants with pulse-fed vertical flow filters are one of the most efficient treatment technologies. For optimum operation, intermittent loading of wastewater onto the filter surface is necessary, for which various types of automatic siphons can be used in addition to pumps. This kind of automatic siph...

Several geochemical analyses (bulk parameters, particle size, loss on ignition, major, minor and trace elements) were performed on 51 recent sediment samples collected in May 2022 from Rosulet, Rosu and Puiu lakes which are located in the fluvio-marine delta plain of the Danube Delta, Romania. The aim of this study was to decipher the potential origin of anthropogenic and/or natural sources, weathering, sedimentary processes and the local geochemical fingerprint on the distribution of specific chemical elements in...

In recent years, the growing impact of flood events on society, economy and environment, has increased the need for early prevention and mitigation measures. The prediction of future flooding areas represents an important tool that can reduce the magnitude of consequences, by identifying and mapping the flood prone-areas. The intensity and extension of floods depends on various contributing parameters, such as hydrometeorological and geomorphological indicators, land use, anthropic activities. Therefore, by analys...

Many national and international agencies and organizations collect and provide open access to data on parts of the Earth's surface covered by water. Data on ocean temperature and acidity, precipitation, river flows, lake, sea, and groundwater levels, and many other open data sets allow researchers to monitor and observe water at different scales and time frames, and to better understand ecological processes and human impacts on the water environment. The main challenge in analyzing the vast amount of openly availa...

The treatment of the Pasig River water using ultrafiltration is a promising solution that may help address issues on public water quality and availability around Metro Manila, Philippines. To improve the treatment performance, ultrafiltration can be applied with coagulation and adsorption. In this study, the effectiveness of ultrafiltration in treating the Pasig River water with dual coagulation and adsorption was investigated by determining the percent removal of TDS, turbidity, Escherichia coli (E. coli), nitrat...

The inhabitants produce the sump waters and accumulate temporarily in the sumps. This is sewage that must be treated before it is discharged to surface waters. Slovak legislation does not allow the discharge of such waters into the soil. The possibilities of sump water treatment are given by the water management equipment of the given locality where sewage water is produced. The most common treatment method is transported at municipal wastewater treatment plants, which are, however, largely congested. In many case...

In a climate change scenario, natural disasters as wildfires and their consequences are expected to increase. Besides the loss of vegetation, wildfires have severe effects over mountain environments, frequently affecting slope stability and eventually provoking further economic losses and casualties. The risen probability of flash flooding and debris flow is recognized to depend on a modification of the soil hydrological properties, in particular of the soil infiltration capacity, in burnt terrains. Past studies i...

Climate change is the most pronounced in the last thirty years. In the world, but also in Slovakia, there are extreme temperatures and frequent periods of drought alternating with torrential precipitation. Neither of these two options is suitable for the country. The aim of this article was to determine the distribution of precipitation in the period 1991- 2020. Using the Mann-Kendall trend analysis, it was determined a statistically significant increase or decrease in precipitation in individual months of the yea...

The safety of navigation and life in the risk areas adjacent to the coastal area, represent the central objective of the paper and meet the provisions of the European directive "in force." In this context, for defining the geometry of the autonomous modular system used as physical system for marking the fairway, mathematical prediction models were developed. The prediction of phenomena and functional characteristics for autonomous modular system was possible by using a specialized software, where the calculation c...

The population and economy growth in the past years, and subsequently the increased demand for freshwater, led to an increased pressure on water resources. The quality of surface water is affected by anthropogenic factors, such as: domestic sewage, industrial activities, agricultural activities, recreational activities, land use change, urbanization. Therefore, the impact on surface water vulnerability is higher in large urban areas or in urban areas with intense touristic activities. The analysis of water vulnera...

Using aerial vehicles without pilot (UAV-unmanned aerial vehicle) or Drone has seen a rapid development, over the last decade, in order to obtain spatial information of the Earth's surface. This scientific paper was realized for the Hydrotechnical Node of Costei, from Timis County and has as purpose the processing of aerial images, obtained from a Phantom4 Pro device, which is capable to capture video at 4K resolution at 30 frames per second and Full HD 1080p at 120 frames per second for a slow motion with a Sony ...

The climate change facing humanity requires two major and immediate solutions: the need to drastically reduce greenhouse gas emissions on the one hand, and on the other hand the need to adapt to the effects of climate change, given that these effects are already visible and unavoidable due to the inertia of the climate system. Romania is vulnerable to a number of natural climate and geological dangers: floods, droughts, extreme temperatures, the western part of the country registering over time some devastating fl...