Annals of the University of Craiova

Series Geography

Tag: Stefan NEGREANU

Impact of land use/land cover on urban heat island (UHI) within Bucharest area

June 20, 2021 /
Sorin AVRAM Irina ONȚEL Ștefan NEGREANU
Abstract

Environmental issues, in the context of climate change attracted the attention of researchers, government organizations and NGOs, which cooperate to find solutions on the greenhouse effect and decrease carbon dioxide in urban areas. Urban planning could play a key role in minimizing climate risks for the human environment. Bucharest is a very dynamic capital-city in terms of economy and demography and thus its urban extension, along new built-up areas and changes of land use/land cover, has a direct influence on many environmental issues, for example the variation of spatial distribution of temperatures. Over the past 30 years, the urban landscape in Bucharest has been changing as new elements were newly constructed or transformed: numerous residential neighbourhoods in the city and mostly in its peripheral areas, vast commercial areas, business centres, etc. The main objective of this research is to demonstrate the relationship between land cover/land use classes and temperature variations, identified by satellite imagery. Therefore, satellite imagery provided by Landsat 5 TM, Landsat 8 OLI/TIR, Sentinel 1 scenes acquired from the years 1990, 2000, 2007, 2015, 2016, 2017, 2018 were selected for this study. The spatial resolution is 30 m for Landsat images in order to demonstrate the correlation between land use/land cover changes and LST estimation. A multi-temporal analysis was also conducted. Nowadays, high-resolution satellite imagery may contribute greatly to the monitoring of green spaces, saving time and money.

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Evaluation of degradation status for three caves in Romania

January 31, 2021 /

Ștefan NEGREANU

Abstract

Cave ecosystem research has known a growing interest in the last years. Nonetheless there is more to be found out about underground world of caves. The difficulty of access and rapid change of conditions that might occur in many cases, among other factors make the survey of this kind of environment a hard task to accomplish. This paper applies on three caves from Romania, the attempts made by other authors in assessing the degree of cave environment degradation. Method used combines characteristics of both subterranean and supraterranen domains associated to caves.
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Methods and techniques used for establishing the age and genesis of pelitic rocks. Applications in geography

July 14, 2010 / / 0 Comments

Ştefan NEGREANU, Alina VLĂDUŢ, Sorin AVRAM

Abstract: In the sedimentary domain, clays represent about half of the detritic rocks in terms of frequency. Clasts with the diameters smaller than 2 or 4μm, according to the used scale, clays, also called pelitic rocks, have to contain as deposits more than 60% clay minerals of the entire petrographic assembly in order to be categorized as clay rocks. Sediments (the primary material) on the base of which they form after the occurrence of diagenetic processes (porosity reduction, cementation of clasts, dissolving of certain minerals and precipitation of others etc.) are known as muds. The type of clay minerals, their morphology, as well as the morphology of the deposits they belong to, the presence and proportion of different chemical elements characteristic to certain well-established depositing environments, gives us clues about the origin of the primary material and about the transformations, it underwent from the initial depositing stage to the moment the sample is taken.

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Man induced impact on the environment as a result of hydrocarbons’ exploitations within the Amaradia hills

July 14, 2010 / / 0 Comments

Viorica TOMESCU, Liliana POPESCU, Elisabeta CIOCAN, Cristina MARA, Ştefan NEGREANU

Abstract: The contents of the present research comprises the case studies of two areas, which are referential for the exploitation of hydrocarbons in the Amaradia Hills, with major impact on the environment: Brădeşti area, in the south-west of the region and Vârteju area, situated norther, on the Plosca brook valley, a tributary of the Amaradia river.
The paper aims at evaluating the pollution degree which affects the components of the environment, within the extraction areas of hydrocarbons, in order to point out the necessity of the precautionary measures to reduce the negative impact on the environment, all this with a view to applying the principles of sustainable development of the region.

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Using G.I.S. for identifying mobility problems in Milan city

July 14, 2010 / / 0 Comments

Sorin AVRAM, Ştefan NEGREANU

Abstract: Becoming an indispensable instrument in the integrated management of settlements, GIS has become very useful for territorial organization, the fluidization of the traffic representing the priority problem from both the environmental and the social costs point of view. Thus, through various informatical systems and mathematical modeling, a series of thematical layers can be realized, taking into account different variables which enter the equation of the territorial mobility, which, once overlapped, can generate extremely precise information regarding the neuralgic points for mobility, the hours with congestions and the road arteries on which they take place, the finality of information hence obtained being integrated in the territorial organization planning that will solve the main town-planning problems taking into account the valid legislation.

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Ecological landfills: rules and structure

July 13, 2010 / / 0 Comments

Ştefan NEGREANU, Sorin AVRAM

Abstract. From the point of view of waste integrated management, landfills are regarded as a high priority option by most of the public local administrations in Romania, but involve considerable economic investment and relatively large land areas. “Best available technology” becomes a mandatory option when opening such a site, as well as the choosing of the construction technology using the logic analysis Life Cycle Assessment, amortization of the investment, and also the environment protection. Community legislation provides a series of conditions, which must be followed, regarding location, structure, materials and general rules in terms of ambient impact studies, meant to ensure an increased degree of environmental protection accepting the increase in the limits of sustainable development.

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The Annals of the University of Craiova. Series Geography is an international journal which provides an opportunity for the publication of original scientific contribution of interest to a wide readership and covering all branches of Geography. The journal first appeared in 1998, being edited by the Geography Department of the University of Craiova and reuniting scientific reviewers from prestigious national and international universities.

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