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Dive into the research topics where Cristian Constantin Stoleriu is active.

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Featured researches published by Cristian Constantin Stoleriu.


Archive | 2013

Vegetation and Fauna

Gheorghe Romanescu; Cristian Constantin Stoleriu; Andrei Enea

The chapter concerning the vegetation and fauna of the Red Lake (except for the wetlands) is based upon data taken from the scientific literature. From this perspective, the ecologic succession of the lacustrine system may be divided into three phases: open water with an oligotrophic lake regime; invasion of the lake with aquatic macrophytes, with an oligotrophic-mesotrophic lake regime; and, in the end, mesotrophic; senescence, with a mesotrophic-eutrophic lake regime (Ghenciu Trăsături hidrofizice, hidrochimice si hidrobiologice ale Lacului Rosu, 1972). The vegetation within the hydrographic basin is dominated by pine forests: spruce (Picea excelsa); silver fir (Abies alba); white pine (Pinus silvestri); larch (Larix decidua), etc. On the mountain pastures and on the alpine empty crests, graminaceous plants are predominant: red fescue (Festuca rubra); matgrass (Nardus stricta); rosy vanilla orchid (Nigritella rubra) etc., while hydrophyte and helophyte vegetation is present through the following associations: Carocetum inflatovesicariae; Caricetum appropinquatae; Equisetum limosi etc. The fauna of the hydrographic basin comprises a great variety of species, many of them rare and protected. Among the mammals the following should be mentioned: the brown bear (Ursus arctos); the common wild boar (Sus scrofa); the red Carpathian deer (Cervus elaphus carpaticus); the roe deer (Capreolus capreolus); the wolf (Canis lupus); the lynx (Felis lynx); the wildcat (Felis silvestris); the chamois (Rupicapra rupicapra), etc. The fish fauna is specific to the upper salmon area. As it contains dry residue, organic substance, nitrates, phenols, etc., the water provides satisfying conditions for the fish culture.


Archive | 2013

Limnology of the Red Lake, Romania

Gheorghe Romanescu; Cristian Constantin Stoleriu; Andrei Enea

Limnology is one of the most important disciplines of hydrology. It studies inland waters and all other standing waters (natural or artificial), including hydrologic phenomena, physical or chemical, in relation to the environment (chemism, thermals, dynamics, development capabilities of the flora and fauna associations, etc.), as well as the way they are valorized by man. From a historical point of view, limnology is only approximately one century old and the founder of limnology is considered to be François A. Forel from the University of Lausanne (Switzerland). It is very important to make a clear distinction between similar terms, such as ‘‘lake’’ and ‘‘pool’’ and define a clear terminology. Out of the grand total of 1 million lakes, distributed all around the world, in Romania, there are currently about 3,450 lakes. There are many types of lakes and numerous classifications are based on several factors, such as: the origin of the lacustrine basin, hydric regime, thermal regime, mineralization degree, trophic potential, geographic position, nature (natural vs. anthropic). The anthropic category is devised into smaller types, depending on the size (the amount of the water reservoir), or on the purpose (hydro-energetic, drinking or industrial water supply, irrigations, pisciculture, recreation, balneotherapeutic, residue cleaning, wet concentration, etc.). The Red Lake is a natural dam lake, which was formed after a huge landslide blocked the Bicaz Valley in 1837. Here, the objective is emblematic, because it is the most well-known natural barrage lake in Romania. 1.1 Concept and Definition Limnology is the science that studies inland waters and all other standing waters (natural or artificial), including hydrologic phenomena, physical or chemical, in relation to the environment (chemism, thermals, dynamics, development capabilities of the flora and fauna associations, etc.), as well as the way they are valorized by man. G. Romanescu et al., Limnology of the Red Lake, Romania, DOI: 10.1007/978-94-007-6757-7_1, Springer Science+Business Media Dordrecht 2013 1 The word ‘‘limnology’’ comes from the Greek limne = lake. In the category of lacustrine waters are included lakes, ponds and mires. More recently, wetlands have also been included in this category. Through its subject, limnology is a border discipline between geography and biology. It belongs to geography because it studies depressions and the way they were formed; it studies water, with all its characteristics (physical, chemical and dynamics), meaning the biotype—this sub-branch is called physical limnology. It also belongs to biology because it studies the flora and fauna of stagnant waters (biohydrocenosis)—this branch is called biological limnology. As the biotope and biohydrocenosis within a lake form a whole, standing waters in general represent the most typical systems in nature; they may also be called limno-systems (Hutchinson 1957; Dussart 1966, 1992; Gâs tescu 1979). ‘‘Lakes, moreover, form more or less closed systems, so that they provide a series of varying possible ecologic worlds which permit a truly comparative approach to the mechanisms of nature’’ (Hutchinson 1957). The American biologist Forbes (1887) compares the lake with a microcosm—hence the importance of lake studies to reveal the geographic evolution of an area. In a broader perspective, limnology is ‘‘the interdisciplinary science which studies water basins with slow water exchange—natural or artificial—historically, meaning dynamically in time and regionally in space, the current physical and biotic process, on the grounds of energy and matter transformation within the water body. It also studies the laws of their evolution and geographic status, their natural resources, and possibility of use by mankind’’ (Gâs tescu 1971). 1.2 Limnological History The Swiss naturalist and professor of medicine, François A. Forel, at the University of Lausanne (Switzerland) (1841–1912) is considered to be the founder of limnology. His first study was ‘‘Matériaux pour servir à l’étude de la faune profonde du lac Léman’’ (1869). The founding book of limnology is ‘‘Le Léman: Monographie limnologique,’’ Lausanne, (1892, 1895, 1904) (3 volumes). Murray (1900) introduces a methodology specific to oceanography and hydrology in his exhaustive research regarding Scottish lakes. Halbfass (1903, 1923) published his treatise on the geography, physics and chemistry of lakes (Berlin), a true basis for modern limnology. Thienemann (1925, 1926) is the first to have studied the insects of streams; he is the most important representative of European limnology (Arlinghaus et al. 2008). For better organization, on 1st January, 1922, in Kiel (Germany), Thieneman August and Nauman Einar founded the International Society of Limnology (S.I.L.—Societas Internationalis Limnologiae). It comprised 103 specialists from various countries. The first systematic observations on the lakes in our country truly appeared after 1950. For this organized start, the following geographers should be 2 1 Definition of Lakes and Their Position in the Romanian Territory


Journal of Mountain Science | 2017

Geomorphologic map of the 1st Mutnaya River, Southeastern Kamchatka, Russia

Gheorghe Romanescu; Sergey Chalov; Cristian Constantin Stoleriu; Alin Mihu-Pintilie; Silvia Eleonora Angileri; Yulia Kuznetsova; Mariaelena Cama; Michael Maerker

The Kamchatka Peninsula–situated in the Pacific “Ring of Fire”–has 29 active and over 400 extinct volcanoes. Since it is situated in the northeastern extremity of Russia, in subarctic climate, the volcanic landforms are overprinted by the 446 glaciers. This research focuses on the 1stMutnaya catchment which drains the southern slopes of two active volcanoes: Avachinsky and Koryaksky. Those volcanoes are a permanent threat for the cities of Petropavlovsk and Elizovo, which are the 2 of 3 cities of the peninsula. Hence, most of the studies carried out in the area dealt with the natural hazards and only few focus on landscape evolution. Thus, the purpose of this study was to elaborate a cartographic approach which integrates classic geomorphology with state of the art GIS and remote sensing techniques. As result, different landforms and related processes have been analysed and included in the first general geomorphologic map of the 1stMutnaya catchment.


Journal of Maps | 2017

Historic flood events in NE Romania (post-1990)

Gheorghe Romanescu; Catalin Ionut Cimpianu; Alin Mihu-Pintilie; Cristian Constantin Stoleriu

ABSTRACT Using open-source satellite imagery like Landsat TM, ETM+ and Sentinel 2 can lead to accurate cartographic products. We mapped flood events from Siret and Prut river basins in the last 30 years based on the availability of Landsat data archive. In this area were recorded historical values in flow rates for the entire Romanian territory: 4650 m³/s on the Siret River in 2005 – the maximum value ever recorded for Romania; 4240 m³/s on the Prut in 2008 – second maximum value recorded for Romania. The most powerful floods that took place in Romania in the last years were in 1970, 1975, 1991, 2005, 2008, 2010 and 2011. In this study four years are distinguished by particularly characteristics: 1991, 2005, 2008 and 2010. Developing geo-hydrological hazard maps and adequate analysis at an appropriate scale and as quickly as possible is extremely important from an economic and social point of view.


Acta Geobalcanica | 2016

GIS methods for assessment of hydrogeomorphic risk and anthropogenic impact which affect the archaeological sites. Case study: Dealul Mare archaeological site, Moldavian Plateau (Romania)

Alin Mihu-Pintilie; Andrei Asăndulesei; Cristian Constantin Stoleriu; Gheorghe Romanescu

On the territory of Moldova Plateau (Eastern Romania), the degradation of prehistoric archaeological sites is a major issue concerning their conservation. The intensification of soil erosion, actual geomorphological processes and human impact (agriculture, over-grazing, exploitation) are the main causes leading to their destruction. For this reason, different approaches and methods, from scientifical works, were used to assess the intensity of erosion in this region of the country, but most of them have focused only on soil degradation. This study proposes a GIS method, to evaluate not only hydrogeomorphological hazards but also human impact that affecting archaeological sites, which use multiple thematic layers quantified in a single evaluating system (Likerd-type scale). A risk map was generated on 1sqkm extend and based on geoformula, which was adapted for a case study (Dealul Mare archaeological site). In calculation of this geoformula were inserted the following parameters: slope, the occurrence frequency for landslides based on aspect classes, potential water flow erosion depending on land use, potential soil types erosion, surface and liniar erosion, landslides and slope gravitational processes and human impact. The spatial analysis use a digital terrain model (DTM) with a high precision (0.25 sqm/pixel), based on LiDAR technology. Contrary to the traditional scientifical papers, characterized by subjectivity, in this study the detailed identification of risk areas was allowed by a largescale analysis. The proposed method can be applied to all archaeological sites, in Moldova Plateau, and also can be a tool for commencement of conservation works for archaeological sites which can be at risk of being destroyed.


Key Engineering Materials | 2015

Physico-Chemical Parameters in Mountain Freshwater: Cuejdi River from Eastern Carpathians, Romania

Alin Mihu-Pintilie; Gheorghe Romanescu; Cristian Constantin Stoleriu; Iuliana Gabriela Breabăn

Spatial and seasonal variation of physico-chemical parameters of mountain streams is influenced by anthropogenic pollution pressure. The assessment of Cuejdi river water quality from Stânişoarei Mountains through 13 parameters, was performed. 30 samples each were collected during spring and autumn of 2013/2014, measurements being made both in situ aquatic ecosystem (Multi 350i / SET WTW) and in laboratory (bench meter Hanna HI 4421, Titroline 700 SI Analytics and WTW Turb 555IR).


International Scientific Conference Geobalcanica 2015 | 2015

MORPHO-BATHYMETRY AND GIS-PROCESSED MAPPING IN DELIMITING LACUSTRINE WETLANDS: THE RED LAKE (ROMANIA)

Gheorghe Romanescu; Cristian Constantin Stoleriu

The delimiting of wetland boundaries is generally performed by taking into account hydrological, geomorphological, pedological, and biological factors. The hydrogeomorphological factors that are considered include elevation, bathymetry, and the nature of the underlying soil. However, in the case of lacustrine wetlands, two factors affecting the distribution of living organisms have been ignored: the inclination and exposure of the slopes from the photic zone. The wetlands around the Red Lake in Romania were delimited using the maps from sonar bathymetric measurements. The processing of the data using GIS techniques revealed minute details about the features of the slopes and the size of the areas with suitable exposure for the living organisms from the lacustrine cuvette to thrive. The greatest depths (10.5 m) were observed in the central sector close to the outlet of the two arteries. The cross-section revealed that the western shore was steep and rocky, while the eastern cross-section had a gentler slope and was crumbly due to landslide. The wetlands associated with the Red Lake developed in the sectors with shallow depths, adequate insolation, and organic soils and limnosoils on gentle slopes, which are frequently or permanently inundated.


Limnological Review | 2018

The variations of physico-chemical parameters during summer in Lake Erenciuc from the Danube Delta (Romania)

Gheorghe Romanescu; Alin Mihu-Pintilie; Cristian Trifanov; Cristian Constantin Stoleriu

Abstract Lake Erenciuc is situated in the Danube Delta (Romania) and was created in the abandoned riverbed of the Sfântu Gheorghe arm. It is the largest meander lake in Romania. During spring–summer, the physico-chemical parameters of water have been measured in seven lake sampling points and one at the Sfântu Gheorghe branch, which supplies the lake through Erenciuc channel. The area around Lake Erenciuc belongs to the category of strictly protected areas within the Danube Delta Biosphere Reserve. The following water quality parameters were measured: temperature (T: °C); pH (pH units); Luminescent Dissolved Oxygen (LDO: mg dm−3); Dissolved Oxygen saturation (DO: %); water tension (U: mV); Electrical Conductivity (EC: μS cm−1); Total Dissolved Solids concentration (TDS: mg dm−3). The recorded values are easily differentiated across the entire length of the elongated lake path, especially between inflow (upstream) and outflow (downstream). The parameters recorded during the spring–summer period, with high flow rates and high water levels, demonstrate good lake water quality, especially oxygenation. The study also demonstrates that high waters refresh and recalibrate the water quality in isolated lake basins.


International Scientific Conference GEOBALCANICA | 2016

GEOMORPHOLOGIC RISK ASSESSMENT IN TECUCEL DRAINAGE BASIN, USING GIS TECHNIQUES

Marian Albu; Cristian Constantin Stoleriu; Andrei Enea; Marina Iosub; Oana Elena Hapciuc; Gheorghe Romanescu

This paper aims to use a multi-parameter method for estimating the geomorphologic risk, in Tecucel drainage basin, Romania. It is located in the South-Eastern region of the country, and it is an tributary of Barlad river, draining important inhabited areas. The population is predominantly rural and mostly based on agricultural activities, therefore the farmlands are extremely important in their lives, the geomorphologic risk leading to potential reduction of arable land, which ensures the very existence of the inhabitants. The evaluation for this type of risk implies the analysis of several morphometrical parameters, out of which the most important are slope, land use, surface curvature, soil etc. The main morphometrical layers are generated from a terrain model, derived from Lidar data. This method includes the classification of each parameter, according to a riskbased logic. Therefore, high values of each parameter will be associated with landslide prone areas. The following process is the combination of all the layers into a final layer, using a geoformula, which will be implemented in GIS software. Among the results, the most relevant is considered to be a map revealing all the risk prone areas, including the overlapping villages. Based on this map, a statistical analysis will be performed, revealing the estimated built-up areas that are prone to be affected, as well as farmland. This proposed approach, which uses GIS techniques to map the geomorphologic risk, is useful to emphasize the potential danger associated to landslides, gully erosion and their direct effect on the human activities.


International Scientific Conference GEOBALCANICA | 2016

SUITABILITY ANALYSIS FOR BUILDING DAM LAKES IN THE ORIENTAL CARPATHIAN MOUNTAINS, ROMANIA. CASE STUDY: TROTUS RIVER BASIN

Andrei Enea; Daniel Neamțu; Cristian Constantin Stoleriu; Gheorghe Romanescu

This paper aims to analyze the suitability of Trotus river drainage basin, for building dam lakes. At present, water demand is a rising, global issue. There are numerous studies concerning water supply in different regions, as well as solutions for areas associated with water level decrease. Numerous economical sectors imply the use of water (agriculture, industry, tourism, food industry etc), therefore the analysis of areas where potential, new, artificial dam lakes can be built, is mandatory. There are numerous factors that engineers have to take into consideration, when building a dam for an artificial lake. Some of the most important parameters are land use, geology, soil and inhabited areas. For this study, these parameters have been combined into a multi-layer based GIS analysis, in which each layer has different values corresponding to the suitability of the elements contained on that layer, to the dam building purpose. The main results reveal a classified version of a suitability report, depicting the best areas for building a dam lake, in Trotus drainage basin. After choosing the best location for a potential, new lake, several calculations have been made, regarding simulated lake surface, the time it would take to fill the lake, according to different flow rates of the chosen river, the number of households that would have to be moved / relocated because of the lake expansion, and also potential estimated costs for the household relocation process. Overall, this methodological approach is considered to be valid, taking into consideration the validation of the results, with real life dams, that have already been built in these areas.

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Dive into the Cristian Constantin Stoleriu's collaboration.

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Gheorghe Romanescu

Alexandru Ioan Cuza University

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Andrei Enea

Alexandru Ioan Cuza University

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Alin Mihu-Pintilie

Alexandru Ioan Cuza University

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Catalin Ionut Cimpianu

Alexandru Ioan Cuza University

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Marina Iosub

Alexandru Ioan Cuza University

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Andrei Asandulesei

Alexandru Ioan Cuza University

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Angela Lupascu

Alexandru Ioan Cuza University

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Cristi Ionut Nicu

Alexandru Ioan Cuza University

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Ionut Cristi Nicu

Alexandru Ioan Cuza University

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