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Drought with its occurrence and manifestations at all levels of the natural components, yields both direct and indirect negative effects, on the ecological systems, water resources, social, as well as economic aspects of life. Therefore, any analysis that concerns this phenomenon, must be carried out at a multi-scalar level, addressing all manifestation levels (meteorological, hydrological, and hydrogeological drought). Standardized evaluation indices (for precipitation-SPI, evaporation-, -SPEI, streamflow-SDI and groundwater-SGI) have been used to analyze the evolution of the drought phenomena in Eastern Romania, for 1, 3, 6 and 12 months’ time-scales, applied to seven groundwater bodies. The results of the analysis complement the observations concerning the evolution of meteorological drought (using SPI and SPEI) in the East European region, by highlighting the drought sequences of the last two decades of the last century. Those are accompanied by the meteorological drought sequences which occurred on extensive areas, starting from 2007, until present, with direct effects in river discharge and increases in groundwater level depths. The Bravais–Pearson correlation coefficient shows a close connection between meteorological and hydrological drought (r ~ 0.45 to 0.68) and between hydrological and groundwater drought (r ~ 0.42 to 0.74) for wells with piezometric level under 5 m depth. In the larger context of climate scenarios which envision an increase in air temperature, and a decrease in the atmospheric hydrological input, the increase in the drought frequency is obvious, with direct effects on all-natural components that are dependent on the hydrological resources.
Ionuţ Minea; Marina Iosub; Daniel Boicu. Multi-scale approach for different type of drought in temperate climatic conditions. Natural Hazards 2021, 1 -25.
AMA StyleIonuţ Minea, Marina Iosub, Daniel Boicu. Multi-scale approach for different type of drought in temperate climatic conditions. Natural Hazards. 2021; ():1-25.
Chicago/Turabian StyleIonuţ Minea; Marina Iosub; Daniel Boicu. 2021. "Multi-scale approach for different type of drought in temperate climatic conditions." Natural Hazards , no. : 1-25.
Groundwater resources from a region may be subject to complex human and climatic pressure. The present study tries to analyze the human and climatic pressure on the groundwater resources from the eastern part of Romania, between 1983 and 2017, for seven groundwater bodies. Two parameters, the groundwater exploitation index (GWEI) and the Standardized Groundwater Index (SGI) for identifying hydrogeological droughts, were used to assess human and climatic pressure. The high values of GWEI show a significant increase in human pressure on water resources in recent decades, in lower and more populated areas, from the south and north part of de region, amid increasing investment in agriculture. In the case of climate pressure, the SGI values show significant values for the years 1983, 2000, 2007, and 2012. However, the overlap of hydrogeological droughts with an increase in human pressure can have a significant impact on the groundwater resources from this region, with negative effects in the mid and long term, under the growing effects of the regional climate changes.
Ionuț Minea; Marina Iosub; Daniel Boicu. Groundwater Resources from Eastern Romania under Human and Climatic Pressure. Sustainability 2020, 12, 10341 .
AMA StyleIonuț Minea, Marina Iosub, Daniel Boicu. Groundwater Resources from Eastern Romania under Human and Climatic Pressure. Sustainability. 2020; 12 (24):10341.
Chicago/Turabian StyleIonuț Minea; Marina Iosub; Daniel Boicu. 2020. "Groundwater Resources from Eastern Romania under Human and Climatic Pressure." Sustainability 12, no. 24: 10341.
The evolution of groundwater levels is difficult to predict over medium and long term in the context of global climate change. Innovative trend analysis method (ITA) was used to identify these trends, and ITA index was calculated to measure their magnitude. The data used are sourced from 71 hydrogeological wells that were dug between 1983 and 2018 and cover an area of over 8000 km2 developed in the temperate continental climate in the north-eastern part of Romania. The results obtained by applying the ITA show a general positive trend for groundwater level over 50% of wells for winter and spring seasons and annual values. The negative trends were observed for more than 43% of wells for the autumn season followed by the summer season (less than 40%). The magnitude of trends across the region shows a significant increase for spring season (0.742) followed by winter season (0.353). Important changes in the trends slopes and magnitudes have been identified for groundwater level depth between 0 and 4 m (for winter and spring seasons) and between 4 and 6 m (for summer and autumn seasons). The results can be implemented in groundwater resources management projects at local and regional level.
Ionuț Minea; Daniel Boicu; Oana-Elena Chelariu. Detection of Groundwater Levels Trends Using Innovative Trend Analysis Method in Temperate Climatic Conditions. Water 2020, 12, 2129 .
AMA StyleIonuț Minea, Daniel Boicu, Oana-Elena Chelariu. Detection of Groundwater Levels Trends Using Innovative Trend Analysis Method in Temperate Climatic Conditions. Water. 2020; 12 (8):2129.
Chicago/Turabian StyleIonuț Minea; Daniel Boicu; Oana-Elena Chelariu. 2020. "Detection of Groundwater Levels Trends Using Innovative Trend Analysis Method in Temperate Climatic Conditions." Water 12, no. 8: 2129.
The aim of this paper is the application of temporal analysis of daily and 10 min of rainfall data from Poprad station, located in Eastern Slovakia. There are two types of data used in the analysis, firstly, a daily time step data, manually collected between the years 1951 and 2018 and secondly, 10 min of data, automatically collected between the years 2000 and 2018. For proper comparability, the automatically collected data has been recalculated to the daily form. After a comparison of the sets of data, manually collected daily data has been used in further analysis. The main analysis can be divided into two sections. The first section consists of basic statistics (mean, standard deviation, etc.) and the second section of descriptive statistics, where the subjects of examination were trend, stationarity, homogeneity, periodicity and noise. The results of the basic statistics outlined trend behavior in the data meaning that the annual total rainfall for the period 1951–2018 is slightly increasing but the further investigation supported by the methods of descriptive statistics refuted this thesis. The number of rainy days is decreasing but maximum rainfall intensity is increasing year by year, indicating that total rainfall is happening in lesser and lesser days, with an increase in the number of 0 rainfall days. The results demonstrated no presence of the trend or only a weak trend in daily time step, but a significant increasing trend in annual rainfall. Tests of stationarity proved that the data are stationary and, therefore, suitable for any hydrologic analysis. The tests of homogeneity showed no breakpoints in the data. The interesting result was demonstrated by the periodicity test, which showed exactly a 365.25 days’ period, while 0.25 indicates a leap year. As a summary for the Poprad station, there is no tendency of increasing of daily average rainfall, but slight increasing trend of total annual rainfall, the summer season has the highest ratio on total precipitation per year, September and October are the months with the highest numbers of days without rain.
Adam Repel; Vinayakam Jothiprakash; Martina Zeleňáková; Helena Hlavatá; Ionut Minea. Temporal Analysis of Daily and 10 Minutes of Rainfall of Poprad Station in Eastern Slovakia. Hydrology 2020, 7, 32 .
AMA StyleAdam Repel, Vinayakam Jothiprakash, Martina Zeleňáková, Helena Hlavatá, Ionut Minea. Temporal Analysis of Daily and 10 Minutes of Rainfall of Poprad Station in Eastern Slovakia. Hydrology. 2020; 7 (2):32.
Chicago/Turabian StyleAdam Repel; Vinayakam Jothiprakash; Martina Zeleňáková; Helena Hlavatá; Ionut Minea. 2020. "Temporal Analysis of Daily and 10 Minutes of Rainfall of Poprad Station in Eastern Slovakia." Hydrology 7, no. 2: 32.
During the last 30 years, the Romanian economy has faced different challenges due to structural readjustments, overcoming crisis and globalization. The share of primary and secondary sectors in the gross domestic product have strongly decreased, while the services have taken off. The main objective for this study is to observe how these economic readjustments can be assessed and measured using the Corine Land Cover datasets from 1990, 2000, 2006, 2012 and 2018 (with special observation on the range 2006 and 2018, after Romania was included in European Union). Despite some of the methodological limitations (like the minimum surface change), the Corine Land Cover turned out to be a powerful tool and it allowed us to detect an intense correlation between the socioeconomic and the structural trends in land use, in specific spatial contexts. The artificial surfaces are constantly increasing and this trend is rather visible as a distance function to the major Romanian cities. The most interesting changes occurred in the case of the agricultural polygons. The main trend emphasized by our analysis regards the redeployment of large farms in areas of agronomic and environmental territorial optimum. Such is the case for vineyards (after a decline during 2000–2006) and for annual cultures. All these changes in land-use patterns are too complex to be encompassed by a single methodology, which is why we used different tools, ranging from spatial analysis to geo-economic modeling, in order to detect how the Corine Land Cover datasets might be used for a better understanding of the Romanian economic readjustments.
Alexandru Rusu; Adrian Ursu; Cristian Constantin Stoleriu; Octavian Groza; Lilian Niacșu; Lucian Sfîcă; Ionuț Minea; Oana Mihaela Stoleriu. Structural Changes in the Romanian Economy Reflected through Corine Land Cover Datasets. Remote Sensing 2020, 12, 1323 .
AMA StyleAlexandru Rusu, Adrian Ursu, Cristian Constantin Stoleriu, Octavian Groza, Lilian Niacșu, Lucian Sfîcă, Ionuț Minea, Oana Mihaela Stoleriu. Structural Changes in the Romanian Economy Reflected through Corine Land Cover Datasets. Remote Sensing. 2020; 12 (8):1323.
Chicago/Turabian StyleAlexandru Rusu; Adrian Ursu; Cristian Constantin Stoleriu; Octavian Groza; Lilian Niacșu; Lucian Sfîcă; Ionuț Minea; Oana Mihaela Stoleriu. 2020. "Structural Changes in the Romanian Economy Reflected through Corine Land Cover Datasets." Remote Sensing 12, no. 8: 1323.
Concentration of time (Tc) is a frequently used parameter in the evaluation of the hydrological response of different sizes hydrographic basin in case of rainfall events. The present study is innovative, because it has created an index that identifies the small‐sized hydrographic basins that are exposed to the risk of flooding. The Moldavian Plain is an area located in the northeast of Romania where the local population is frequently affected by floods and flash floods caused by heavy rainfall events. The main purpose of the current study is to identify the settlements located in the small‐sized hydrographic basins, which are associated with low concentration times and powerful surface runoff. The empirical method was applied in order to calculate the Tc for rainfall water, for each drainage basin, for a time class less than 6 hr. Calculations of the runoff water were also done for a theoretical extreme precipitation event, corresponding to the 1% occurrence probability. A total number of 312 basins were identified that are smaller than 30 km2, out of which 112 have Tc of less than 6 hr. These basins, in particular, pose flood risk for 12.4% of the villages and towns in the study area.
Marina Iosub; Ionuţ Minea; Oana E. Chelariu; Adrian Ursu. Assessment of flash flood susceptibility potential in Moldavian Plain (Romania). Journal of Flood Risk Management 2020, 13, 1 .
AMA StyleMarina Iosub, Ionuţ Minea, Oana E. Chelariu, Adrian Ursu. Assessment of flash flood susceptibility potential in Moldavian Plain (Romania). Journal of Flood Risk Management. 2020; 13 (4):1.
Chicago/Turabian StyleMarina Iosub; Ionuţ Minea; Oana E. Chelariu; Adrian Ursu. 2020. "Assessment of flash flood susceptibility potential in Moldavian Plain (Romania)." Journal of Flood Risk Management 13, no. 4: 1.
The important hydroelectric potential of Romania has been tapped on most of the mountainous rivers: Bistrita (along with the Siret and Pruth), Olt, Jiu, Arges, Lotru, Somes, Raul Mare. The Danube, with its potential of 2100 MW, has also been harnessed, with the Iron Gates I as the only hydropower plant in Romania that functions permanently. The hydroelectric power potential of Romania is important and it has been exploited on most mountainous rivers: Bistrita (along with Siret and Pruth), Olt, Jiu, Arges, Lotru, Somes, Raul Mare; in addition to them, we must include the Danube, which holds a potential of 2100 MW (Iron Gates I is the only hydropower plant in Romania that functions permanently). The regional climate is increasingly unpredictable, and the hydrological risk events (droughts and tidal waves) occur more frequently. In this case, infrastructures capable of water intake are required (either to compensate for the droughty periods or to mitigate floods). For the past 25 years, droughty periods have increased in length and severity, though, the mean amount of precipitations has augmented. The drought recorded in the autumn of the year 2011 and the spring of the year 2012 entailed a drastic reduction in power production provided by hydropower plants, reasons for which the company Hidroelectrica S.A. became unable to distribute power to beneficiaries. On an average hydrological year, Romania produces 17.33 TWh, which means 35% of the consumption. In this case, Hidroelectrica S.A. was sued by a series of partners who were no longer satisfied with the quality of the distribution.
Gheorghe Romanescu; Ionuț Minea. Drought and Insolvency: Case Study of the Producer-Buyer Conflict (Romania, the Period Between the Years 2011–2012). Springer Water 2019, 489 -515.
AMA StyleGheorghe Romanescu, Ionuț Minea. Drought and Insolvency: Case Study of the Producer-Buyer Conflict (Romania, the Period Between the Years 2011–2012). Springer Water. 2019; ():489-515.
Chicago/Turabian StyleGheorghe Romanescu; Ionuț Minea. 2019. "Drought and Insolvency: Case Study of the Producer-Buyer Conflict (Romania, the Period Between the Years 2011–2012)." Springer Water , no. : 489-515.
The regional and local strategies of the past decade have attempted to introduce the principles of sustainable development, which would allow Romania to both meet economic demands and face increasingly pronounced climate change. With a surface of 20,569 km2 and a population of 2.2 million, the eastern part of the country, spread between the rivers Siret and Prut and sharing borders with the Ukraine (to the north) and the Republic of Moldova (to the east). All the region is classified as vulnerable from an economic and social point of view, but also as far as the impact of climate change upon water resources is concerned. Anthropic activities and climate change are triggering the modification of the hydrological regime (in both quantity and quality) and an increase in the severity of issues associated with water bodies shared with other countries (such as the river Prut, which acts as the border between Romania and the Republic of Moldova), thus rendering an already overexploited resource even more vulnerable. The conclusions of scientific analyses aimed at assessing the effects of climate change upon water resources allow an evaluation of their degree of vulnerability in the face of irreversible challenges. The trend toward phenomena such as global warming, evaluated for the region at 0.2–0.3 °C for the last 50 years, together with an increase in the frequency of extreme temperature values and precipitation volumes emphasize the degree of vulnerability of water resources to current climate change.
Ionuț Minea. The Vulnerability of Water Resources from Eastern Romania to Anthropic Impact and Climate Change. Springer Water 2019, 229 -250.
AMA StyleIonuț Minea. The Vulnerability of Water Resources from Eastern Romania to Anthropic Impact and Climate Change. Springer Water. 2019; ():229-250.
Chicago/Turabian StyleIonuț Minea. 2019. "The Vulnerability of Water Resources from Eastern Romania to Anthropic Impact and Climate Change." Springer Water , no. : 229-250.
The ratio between streamflow and base flow for 3 catchments from lowland area of North-Eastern Romania were calculated with six different separation methods: the local minimum method, Talaksen filter, Chapman filter, recursive digital filter, WHAT model, and the Ekchardt filter. In agreement with an increase in precipitation levels in the past decades all filter-based methods indicate a slight increase in Base Flow Index (BFI) values throughout the study period (1981–2013). The Eckhardt filter associated with Chapman filter are the most appropriate methods to evaluate the ratio between streamflow and base flow for this area. Both methods suggest the identification of parameters a and BFImax (a = 0.925, BFImax = 0.5–0.7). Taking into account the highly variable hydrological regime throughout the year, and the fact that 35% of the hydrographic network displays ephemeral stream, the values obtained for the BFI based on these algorithms are the following: BFI = 0.58 for basins developed on porous aquifers with perennial stream (asuming a = 925 and BFImax = 0.7) and BFI = 0.52 for basins developed on porous aquifers, but with ephemeral stream (asuming a = 925 and BFImax = 0.5).
Ionuţ Minea. Streamflow-base flow ratio in a lowland area of North-Eastern Romania. Water Resources 2017, 44, 579 -585.
AMA StyleIonuţ Minea. Streamflow-base flow ratio in a lowland area of North-Eastern Romania. Water Resources. 2017; 44 (4):579-585.
Chicago/Turabian StyleIonuţ Minea. 2017. "Streamflow-base flow ratio in a lowland area of North-Eastern Romania." Water Resources 44, no. 4: 579-585.
An important aspect of the statistical assessment of the correlation between precipitations - water and sediments is the way these parameters are assessed by means of statistical correlations of the type Q=f(Pp), R=f(Q) or R=f(Pp). Following the analysis of the three types of correlations the conclusion that water and sediment flows depend much on the quantity of water that falls may be reached. The accumulations however introduce some modifications of the water run-offs depending on the intended use. In order to carry out detailed analyses of some processes related to the evolution of channel bed or reservoirs silting, the equations may be extrapolated to the entire river basin
Minea Ionuţ; Nica Dragoş; Boca Bogdan. Preliminary Assessments of the Relation: Precipitations – Water – Sediments with Regard to some Anthropic Accumulations in the River Basin of Bahlui. Present Environment and Sustainable Development 2014, 8, 119 -126.
AMA StyleMinea Ionuţ, Nica Dragoş, Boca Bogdan. Preliminary Assessments of the Relation: Precipitations – Water – Sediments with Regard to some Anthropic Accumulations in the River Basin of Bahlui. Present Environment and Sustainable Development. 2014; 8 (1):119-126.
Chicago/Turabian StyleMinea Ionuţ; Nica Dragoş; Boca Bogdan. 2014. "Preliminary Assessments of the Relation: Precipitations – Water – Sediments with Regard to some Anthropic Accumulations in the River Basin of Bahlui." Present Environment and Sustainable Development 8, no. 1: 119-126.