fg
← Older articles
Newer articles →
Volume XIII |
Climatology

Assessment of the long-term wind energy resources in the Southern Bârlad Plateau. An applied climatology study

1,

Abstract: In order to evaluate the long-term wind conditions and energy resources in the Southern Bârlad Plateau, the WINDATLAS method has been applied, using the numerical software programs WindPRO 2.7 and WAsP 9. For this purpose, 2 years (2008 – 2010) of in-situ wind measurement data from two locations were used. These time series have been adjusted to a 30-year long-term period (1981-2010), using NCAR global weather analyses data, and validated with the monthly means of the wind speed recorded at Galați meteorological station (1981-2010). On the basis of the new generated long-term time series, local wind statistics have been obtained, which were used for wind conditions assessment and energy yield calculations within the study area. The average wind speed, the Weibull parameters for the vertical wind profile, as well as the expected wind energy resources have been determined. The Southern Bârlad Plateau is characterized by high wind energy potential demonstrated by long-term averaged wind speeds larger than 7 m/s (at 120 m a.g.l.), similar to Dobrogea region, and by corresponding wind energy values of more than 3000 kWh/m2 at hill top positions. Another key issue is that the energy potential of this area is relatively constant at multi-annual scale, with prevailing winds from northern and southern directions, making it highly suitable for the development of Multi-Megawatt wind farms. The results obtained by applying this complex methodology can be practically valorized by being further integrated in energy production estimates and feasibility studies for wind farms.

Keywords: , , ,
Full article 10.5775/fg.2067-4635.2014.051.dDates:
Received: 18-09-2014 Accepted: 09-12-2014 Printed: 30-12-2014 Online: 22-03-2015
Affiliations:
  • 1 Faculty of Geography, University of Bucharest, 1st Nicolae Bălcescu blv., sector 1, Bucharest, Romania
Corresponding author:
  • florin.tatui@geo.unibuc.ro
Citation:
APA 6 | Harvard 2008 | Turabian 6 | MLA 7
RIS | BibTeX
Acknowledgements: I would like to thank the S.C. Eolian Expert S.R.L. company for providing wind measurement data and computational facilities. Alfred Vespremeanu-Stroe made helpful suggestions regarding the present study.
Copyright: © 2015 The Author(s). Published by Forum geografic.
Provided under the Creative Commons Attribution-NonCommercial-NoDerivatives License.
Open Access article.
Volume XIII |
Hydrology

Seasonal river flow variability of the Middle and Lower Danube and its tributaries

1,

Abstract: The seasonality of stream flow variability indicates special feature of local cycle of precipitations, evaporation and the timing of snow melt. This study presents seasonal occurrence of maximal and minimal annual flows and spatial variability of seasonal index (Is) in the Middle and Lower Danube basin. The analysis is based on 47 time series of monthly runoff (12 for the Danube and 35 for its tributaries), which are collected from public database. The results show that the maximum annual stream flow appears during all months, but with highest frequency in April for 68% from watersheds. It varies between one and 60% (Danube – Baziaz). The monthly flow is concentrated in summer–autumn hydrological season, except for the Jalomita, Siret and Prut river basins, where it is in the winter. The highest frequency of minimum monthly runoff for the Danube and the Tisza is in October and November and for the Sava and Velika Morava – in August and September. The lowest and highest monthly discharge of the given month in the entire period were recorded in different years. Seasonal index (Is) is between 0.98 and 3.18. It is about 1.00 for the Danube and more than 2.00 for the Tisza, Ialomita, Siret and Prut watersheds. Is is stability – coefficient of variation is up to 0.30 with the exception of several river basins. Stream flow variability of the Middle and Lower Danube can provide valuable information for scientific studies and integrated management of water resources.

Keywords: , ,
Full article 10.5775/fg.2067-4635.2014.063.dDates:
Received: 15-10-2014 Accepted: 15-12-2014 Printed: 30-12-2014 Online: 22-03-2015
Affiliations:
  • 1 Faculty of Geology and Geography, Sofia University “St. Kliment Ohridski”, 15 Tsar Osvoboditel Blvd, Sofia, Bulgaria
Corresponding author:
  • hristovaneli@abv.bg
Citation:
APA 6 | Harvard 2008 | Turabian 6 | MLA 7
RIS | BibTeX
Copyright: © 2015 The Author(s). Published by Forum geografic.
Provided under the Creative Commons Attribution-NonCommercial-NoDerivatives License.
Open Access article.
Volume XIII |
Hydrology

Analysis of River regime and Water balance of the Temštica River Basin (South-East Serbia) during the 1980-2012 Period

1,, 1, 2

Abstract: In this study we analyze river regime and water balance of the Temštica River on the base of thirty three year (1980 – 2012) data series. For this study period, the mean water level of the Temštica River was 41 cm. The average discharge of the Temštica River at Staničenje station for the investigated period is 5.63 m3/s. Annual changes in average discharge is similar to the annual course of mean monthly low and high discharge values. It is concluded that the Temštica river has moderate – continental river regime. Although the precipitation quantity is not so low – 596 mm per year, of which 217.05 mm or 36.42 % of it runoffs, and 378.92 mm, or 63.58% evaporates. The ratio of the components of the water balance in the basin is not convenient, appropriate measures to improve the situation in this river basin should be taken.

Keywords: , , ,
Full article 10.5775/fg.2067-4635.2014.082.dDates:
Received: 12-12-2014 Accepted: 28-12-2014 Printed: 30-12-2014 Online: 22-03-2015
Affiliations:
  • 1 Society of Young Researches “Branislav Bukurov, Department of Geography, Tourism and Hotel management, Faculty of Science,University of Novi Sad, Trg Dositeja Obradovića 3, 21000, Novi Sad, Serbia
  • 2 Faculty of Science, Department of Geography, Tourism and Hotel Management, University of Novi Sad, Trg Dositeja Obradovića 3, Novi Sad, Serbia
Corresponding author:
  • radulovicmirjana94@gmail.com
Citation:
APA 6 | Harvard 2008 | Turabian 6 | MLA 7
RIS | BibTeX
Acknowledgements: This paper is the result of field research of members of the DMI “Branislav Bukurov,” Department of Geography, Tourism and Hotel management, Faculty of Science, during the summer of 2014
Copyright: © 2015 The Author(s). Published by Forum geografic.
Provided under the Creative Commons Attribution-NonCommercial-NoDerivatives License.
Open Access article.
Volume XIII |
Hydrology

Research of water balance at hydrological micro-scale in the Aldeni experimental basin (Romania)

1,, 2

Abstract: The paper presents a number of aspects regarding the Aldeni Experimental Basin (Romania). In order to experimentally investigate micro-scale (plot scale) hydrological impact of soil erosion, the National Institute of Hydrology and Water Management founded, in 1984, the Aldeni Experimental Basin (AEB). AEB is located in the Curvature Subcarpathians, a region characterized by a sharp erosion of soil. Experimental investigations at a micro-scale are aimed towards: determining the parameters of the water balance equation, during natural and simulated rainfall; researching of runoff genetic and soil erosion processes on runoff plots; extrapolating relations involving runoff coefficients from a micro-scale to meso-scale. Runoff plots have A = 80 sq m (20 x 4m), WNV-ESE aspect and an average slope of 5.6%; one runoff plot is maintained with grass, and the other is devoid of grass by digging (processing) and the structure of the first horizon with a depth of 20 cm has been changed, which resulted in a greater development of infiltration than in the first runoff plot. Complex measurements and sampling observations of the necessary elements for the quantitative estimation of the water balance equation are achieved with the help of specific equipment on standard climatologic and hydrological time (hourly and pentads) at hydrometric stations and meteorological platform, while at runoff plots scale per rainfall event. Nowadays, the latest evolutions in data acquisition and transmission equipment are represented by sensors (such as sensors to measure the soil moisture). Exploitation and dissemination of hydrologic data is accomplished by: research themes/projects, yearbooks of basic data (Experimental Basins Yearbook) and scientific papers.

Keywords: , , , ,
Full article 10.5775/fg.2067-4635.2014.104.dDates:
Received: 26-09-2014 Accepted: 20-12-2014 Printed: 30-12-2014 Online: 20-03-2015
Affiliations:
  • 1 National Institute of Hydrology and Water Management, 97 Bucureşti - Ploieşti Road, 1st Sector, 013686, Bucharest, Romania
  • 2 Faculty of Geography, University of Bucharest, 1 N. Bălcescu Avenue, 1st Sector, Bucharest, Romania
Corresponding author:
  • gabriel.minea@hidro.ro
Citation:
APA 6 | Harvard 2008 | Turabian 6 | MLA 7
RIS | BibTeX
Acknowledgements: The authors would like to thank the Scientific Director of the NIHWM, Mrs. Mary-Jeanne ADLER PhD, for allowing Ms. Gabriela MOROȘANU, currently studying for a master’s degree at the Faculty of Geography, University of Bucharest, to carry out practical activities, focused on documentation and research, in the team of the Experimental Hydrology Section, NIHWM and for offering her the opportunity to use the facilities of the Aldeni Experimental Basin. In particular, we thank the Aldeni Experimental Basin staff: Maria MANTA hydrological technician and Tudor BUZDUGA hydrometer.
Copyright: © 2015 The Author(s). Published by Forum geografic.
Provided under the Creative Commons Attribution-NonCommercial-NoDerivatives License.
Open Access article.
Volume XIII |
Biogeography

Conservation Status and Conservation Strategies of threatened aquatic fern Marsilea quadrifolia L. in Europe

1,

Abstract: The aquatic fern Marsilea quadrifolia L is a rare and threatened species in entire Europe due to wetland habitats destruction and changing agricultural practices. To protect it, in situ and ex situ conservation methods are approached in European Union an in other countries. The in vivo and in vitro collections that were developed in botanical gardens in the last two decades are used for reintroduction and for restoration of M. quadrifolia populations in natural sites as well as in agro ecosystems that are analogous to natural habitats. Natural establishment of several M. quadrifolia populations in its natural range is an evidence that it can colonize new suitable habitats, including anthropogenic habitats. Despite conservation strategies approached within the European Union, its area of occupancy has decreased, thereby this species has become vulnerable at European Union level. The main threats are the small size populations, low genetic diversity and genetic erosion of populations, habitat degradation and chemical pollutions of waters by herbicides and fertilizers used in modern agricultural practice.

Keywords: , , , , ,
Full article 10.5775/fg.2067-4635.2014.122.dDates:
Received: 23-07-2014 Accepted: 01-11-2014 Printed: 30-12-2014 Online: 20-03-2015
Affiliations:
  • 1 Faculty of Geography, University of Bucharest, 1 N. Bălcescu Blvd, Bucharest, Romania
Corresponding author:
  • danielastrat@gmail.com
Citation:
APA 6 | Harvard 2008 | Turabian 6 | MLA 7
RIS | BibTeX
Copyright: © 2015 The Author(s). Published by Forum geografic.
Provided under the Creative Commons Attribution-NonCommercial-NoDerivatives License.
Open Access article.
← Older articles
Newer articles →

Meta

© 2009- 2026 Forum geografic

Designed by Alin Clincea.