The present paper examines hydroclimatic dynamics in southwestern Romania drylands, which is one of the country’s most heavily affected regions by climate change. The analysis focuses on two of the region’s representative catchments (Drincea and Desnatui), covers the past five decades (1961–2009), and is based on climate data (mean monthly and annual climatic water balance values – CWB, expressed in mm) and hydrological data (mean monthly and annual streamflow rate values – SFR, expressed in m3/s). The data were provided by five regional weather stations, i.e., by five gauging stations located within the two catchments. The analysis was conducted on three temporal scales (annual, seasonal and monthly), and used statistical methods, such as Mann–Kendall test/Sen’s slope method for trend analysis, and Spearman/Student test for the statistical association between climatic and hydrological parameters. The results indicated an overall increase in climatic water deficit, with direct effects on streamflow reduction. Statistically significant trends (climatic water deficit increase and streamflow decrease) were identified especially in spring (with maximum rate values of (−1.66 mm/yr)/(−81.3 mm/49 yrs), for the CWB, and (−0.02 m3/s/yr)/(−0.9 m3/s/49 yrs), for the SFR). In some cases (mainly in the autumn months) it was found that, while climatic water deficit has decreased, the streamflow rate has increased. Statistical correlations revealed the relationship between the considered hydroclimatic parameters, with a particularly high statistical significance in spring and summer. Weak and inverse correlations between climatic and hydrological parameters can be explained by the role of other factors controlling the streamflow, both natural (soil and lithology) and anthropogenic (wetland drainage, water body conversion, dam and reservoirs building).
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Bandoc G and Golumbeanu M 2010 Climate variability influence to the potential evapotranspiration regime of Sfantu Gheorghe Delta Shore; J. Environ. Prot. Ecol. 10 (1) 172–181.
Bandoc G 2012 Estimation of the annual and interannual variation of potential evapotranspiration; In: Evapotranspiration – Remote Sensing and Modeling (ed.) Irmak A, InTech, Rijeka, Croatia, pp. 251–272.
Bandoc G, Dragomir E and Mateescu R 2013 Spatial analysis of potential evapotranspiration in Danube Delta; Book Series Adv. Edu. Res. 32 181–186.
Bandoc G, Mateescu R, Dragomir E, Golumbeanu M, Comănescu L and Nedelea A 2014 Systemic approach of the impact induced by climate changes on hydrothermic factors at the Romanian Black Sea Coast; J. Environ. Prot. Ecol. 15 (2) 455–467.
Bandoc G and Prăvălie R 2015 Climatic water balance dynamics over the last five decades in Romania’s most arid region, Dobrogea; J. Geogr. Sci. 25 (11) 1307–1327.
Barnett T P, Adam J C and Lettenmaier D P 2005 Potential impacts of a warming climate on water availability in snow-dominated regions; Nature 438 303–309.
Bîrsan M V, Molnar P, Burlando P and Pfaundler M 2005 Streamflow trends in Switzerland; J. Hydrol. 314 312–329.
Bîrsan M V 2013 River liquid discharge rate variability in Romania (in Romanian); PhD thesis, University of Bucharest.
Bîrsan M V, Zaharia L, Chendeş V and Brănescu E 2012 Recent trends in streamflow in Romania (1976–2005); Romanian Reports in Physics 64 (1) 275–280.
Bîrsan M V, Zaharia L, Chendeş V and Brănescu E 2014 Seasonal trends in Romanian streamflow; Hydrol. Process. 28 4496–4505.
Bojariu R, Velea L, Mateescu E, Cica R D, Alexandru D, Dobrinescu A E, Bîrsan M and Dumitrescu A 2012 Local climate mechanisms related to aridization of Oltenia Plain; Ann. Univ. Craiova – Agriculture, Montanology, Cadastre Series 42 (1) 70–84.
Burn D H and Hag Elnur M A 2002 Detection of hydrologic trends and variability; J. Hydrol. 255 107–122.
Busuioc A, Caian M, Bojariu R, Boroneanţ C, Cheval S, Baciu M and Dumitrescu A 2009 Climate regime change scenarios in Romania for the 2001–2030 period (in Romanian); National Meteorology Administration, Bucharest.
Busuioc A, Caian M, Cheval S, Bojariu R, Boroneanţ C, Baciu M and Dumitrescu A 2010 Climate Variability and Change in Romania (in Romanian); Pro Universitaria, Bucharest, ISBN: 978–973–129–549–7.
Cayan D R, Kammerdiener S A, Dettinger M D, Caprio J M and Peterson D H 2001 Changes in the onset of spring in the western United States; Bull. Am. Meteor. Soc. 82 399–415.
CDIAC (Carbon Dioxide Information Analysis Center) 2014 Recent Greenhouse Gas Concentrations; http://cdiac.ornl.gov/pns/current_ghg.html.
Chendeş V, Cheval S and Dumitru S 2010 The assessment of some hydrometeorological drought indices in the Bend Subcarpathians and peripheral zones; Res. J. Agri. Sci. 42 (3) 60–70.
Cheval S, Baciu M and Breza T 2003 An investigation into the precipitation conditions in Romania using a GIS-based method; Theor. Appl. Climatol. 76 77–88.
Ciuinel A M and Onţel I 2012 Variability of precipitation and liquid flow in the Desnatui hydrographical basin; Water resources and wetlands, Conference Proceedings, 14–16 September 2012, Tulcea–Romania.
Ciulache S 2005 Oltenia Plain. Climate (in Romanian); Geography of Romania, Vol. V, Romanian Academy Publishing, Bucharest.
CLC 2006 Corine Land Cover (raster data); European Environment Agency, www.eea.europa.eu.
Croitoru A E, Piţicar A, Dragotă C S and Burada D C 2013 Recent changes in reference evapotranspiration in Romania; Global Planet. Change 111 127–132.
Crueger T, Roeckner E, Raddatz T, Schnur R and Wetzel P 2008 Ocean dynamics determine the response of oceanic CO2 uptake to climate change; Clim. Dyn. 31 151–168.
Dai A, Qian T, Trenberth K E and Milliman J D 2009 Changes in continental freshwater discharge from 1948 to 2004; J. Climate 22 (10) 2773–2792.
Danberg J 2012 Changes in runoff time series in Thuringia, Germany – Mann–Kendall trend test and extreme value analysis; Adv. Geosci. 31 49–56.
Dhital Y P, Tang Q and Shi J 2013 Hydroclimatological changes in the Bagmati River Basin, Nepal; J. Geogr. Sci. 23 (4) 612–626.
Dragomirescu L 1998 Biostatistics for dummies (in Romanian); Constelatii Press, Bucharest, Romania.
Dumitraşcu M 2006 Landscape changes in Oltenia Plain (in Romanian); Romanian Academy Publishing House Bucharest.
Fu G, Chen S, Liu C and Shepard D 2004 Hydro-climatic trends of the Yellow River Basin for the last 50 years; Climatic Change 65 149–178.
Genta J L, Perez-Iribarren G and Mechoso C R 1998 A recent increasing trend in the streamflow of rivers in southeastern South America; J. Climate 11 2858–2862.
Ghioca M 2008 Physical assessment of climatic impact on hydrologic extremes (in Romanian); PhD thesis, University of Bucharest, Physics.
Ghioca M 2009 Drought monitoring using self-calibrating Palmer’s indices in the southwest of Romania; Romanian Reports in Physics 61 (1) 151–164.
Gilbert R O 1987 Statistical methods for environmental pollution monitoring; Van Nostrand Reinhold, New York.
Gou X, Chen F, Cook E, Jacoby G, Yang M and Li J 2007 Streamflow variations of the Yellow River over the past 593 years in western China reconstructed from tree rings; Water Resour. Res. 43 W06434.
Groisman P Y, Knight R W and Karl T R 2001 Heavy precipitation and high streamflow in the contiguous United States: Trends in the 20th century; Bull. Am. Meteor. Soc. 82 219–246.
Hannaford J, Buys G, Stahl K and Tallaksen L M 2013 The influence of decadal-scale variability on trends in long European streamflow records; Hydrol. Earth Syst. Sci. Discuss. 10 1859–1896.
He B, Miao C and Shi W 2013 Trend, abrupt change, and periodicity of streamflow in the mainstream of Yellow River; Environ. Monit. Assess. 185 6187–6199.
Hodgkins G A, Dudley R W and Huntington T G 2003 Changes in the timing of high river flows in New England over the 20th century; J. Hydrol. 278 244–252.
Huang J, Sun S and Zhang J 2013 Detection of trends in precipitation during 1960–2008 in Jiangxi province, southeast China; Theor. Appl. Climatol. 114 237–251.
IPCC 2007 Climate Change 2007: The Physical Science Basis; Contribution of Working Group I to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change; Cambridge University Press, Cambridge, 996p.
JWD (Jiu Water Directorate) 2014 Data series regarding average monthly flow rates of the Drincea River (at the Corlatel and Cujmir gauging stations) and the Desnatui river (at the Dragoia and Goicea gauging stations) (1960–2009).
Kahya E and Kalayci S 2004 Trend analysis of streamflow in Turkey; J. Hydrol. 289 128–144.
Kendall M G 1975 Rank Correlation Methods; Charles Griffin, London.
Klein Tank A M G et al. 2002 Daily dataset of 20th-century surface air temperature and precipitation series for the European climate assessment; Int. J. Climatol. 22 1441–1453.
Kolbert E 2011 Enter the Anthropocene: Age of man; Natl. Geogr. 219 60–77.
Liu W, Cai T, Fu G, Zhang A, Liu C and Yu H 2013 The streamflow trend in Tangwang River basin in northeast China and its difference response to climate and land use change in sub-basins; Environ. Earth Sci. 69 51–62.
Liu H, Li Y, Josef T, Zhang R and Huang G 2014 Quantitative estimation of climate change effects on potential evapotranspiration in Beijing during 1951–2010; J. Geogr. Sci. 24 (1) 93–112.
Ling H, Xu H, Shi W and Zhang Q 2011 Regional climate change and its effects on the runoff of Manas River, Xinjiang, China; Environ. Earth Sci. 64 2203–2213.
Lins H F and Slack J R 1999 Streamflow trends in the United States; Geophys. Res. Lett. 26 227–230.
Ma H, Yang D, Tan S K, Gao B and Hu Q 2010 Impact of climate variability and human activity on streamflow decrease in the Miyun Reservoir catchment; J. Hydrol. 389 317–324.
Mann H B 1945 Non-parametric tests against trend; Econometrica 13 245–259.
Marin L, Birsan M V, Bojariu R, Dumitrescu A, Micu D M and Manea A 2014 An overview of annual climatic changes in Romania: Trends in air temperature, precipitation, sunshine hours, cloud cover, relative humidity and wind speed during the 1961–2013 period; Carpath. J. Earth Env. 9 (4) 253–258.
Martin H and Buishand T A 2012 Multi-model analysis of RCM simulated 1-day to 30-day seasonal precipitation extremes in the Czech Republic; J. Hydrol. 412 (413) 141–150.
Milly P C D, Dunne K A and Vecchia A V 2005 Global pattern of trends in streamflow and water availability in a changing climate; Nature 438 (17) 347–350.
Mitof I and Prăvălie R 2014 Temporal trends of hydroclimatic variability in the lower Buzău catchment; Geographia Technica 1 87–100.
Molyneux N, da Cruz G R, Williams R L, Andersen R and Turner N C 2012 Climate change and population growth in Timor Leste: Implications for food security; AMBIO 41 823–840.
Neculau G and Zaharia L 2009 Mean rainfall and streamflow rate variability trends in Trotus catchment (in Romanian); Geography Reports 13 249–254.
NIHWM (National Institute of Hydrology and Water Management) 2014 Morphometric data of the Drincea and Desnatui rivers.
NMA (National Meteorological Administration) 2014 Data series regarding average monthly temperatures and monthly precipitation quantities at the Calafat and Bechet weather stations (1961–2009).
Palizdan N, Falamarzi Y, Huang Y F, Lee T S and Ghazali A H 2015 Temporal precipitation trend analysis at the Langat River Basin, Selangor, Malaysia; J. Earth Syst. Sci. 124 1623–1638.
Pasquini A I and Depetris P J 2007 Discharge trends and flow dynamics of South American rivers draining the southern Atlantic seaboard: An overview; J. Hydrol. 333 385–399.
Păltineanu C, Mihăilescu I F, Seceleanu I, Dragotă C S and Vasenciuc F 2007 Using aridity indexes to describe some climate and soil features in Eastern Europe: A Romanian case study; Theor. Appl. Climatol. 90 263–274.
Păltineanu C, Mihăilescu I F, Prefac Z, Dragotă C S, Vasenciuc F and Nicola C 2009 Combining the standardised precipitation index and climatic water deficit in characterising droughts: A case study in Romania; Theor. Appl. Climatol. 97 219–233.
Perju E R, Balin D, Lane S and Zaharia L 2013a Climate change impacts on water balance in the Romanian Carpathians: More droughts but fewer floods? Geophysical Research Abstracts 15, EGU2013–8284, European Geosciences Union-General Assembly, Vienna.
Perju E R, Zaharia L, Balin D and Lane S 2013b Hydrological response to climate changes in Bucegi Mountains; Volume of abstracts, Annual Scientific Conference ‘Water Resources Management under Climate and Anthropogenic Changes’, 23–26 September, Bucharest, pp. 98–99.
Peterson B J, Holmes R M, McClelland J W, Vorosmarty C J, Lammers R B, Shiklomanov A I, Shiklomanov I A and Rahmstorf S 2002 Increasing river discharge to the Arctic Ocean; Science 298 2171–2173.
Pişota I 2005 Oltenia Plain. Waters (in Romanian); Geography of Romania, Vol. V; Romanian Academy Publishing, Bucharest.
Pleniceanu V 1999 Waters in Oltenia Plain (in Romanian); Universitaria Publishing, Craiova.
Prăvălie R 2013a Climate issues on aridity trends of southern Oltenia in the last five decades; Geographia Technica 17 (1) 70–79.
Prăvălie R 2013b Aspects regarding spatial and temporal dynamic of irrigated agricultural areas from Southern Oltenia in the last two decades; Present Environment and Sustainable Development 7 (2) 133–143.
Prăvălie R 2013c Considerations about the reduction of marshes in Southern Oltenia; Geographia Technica 8 (2) 71–79.
Prăvălie R, Peptenatu D and Sîrodoev I 2013 The impact of climate change on the dynamics of agricultural systems in south-western Romania; Carpath. J. Earth Env. 8 (3) 175–186.
Prăvălie R, Peptenatu D and Sîrodoev I 2014a Changes in the forest ecosystems in areas impacted by aridization in south-western Romania; J. Environ. Health Sci. Eng. 12 2.
Prăvălie R, Sîrodoev I and Peptenatu D 2014b Detecting climate change effects on forest ecosystems in south-western Romania using Landsat TM NDVI data; J. Geogr. Sci. 24 (5) 815–832.
Prăvălie R and Bandoc G 2015 Aridity variability in the last five decades in the Dobrogea region, Romania; Arid Land Res. Manag. 29 (3) 265–287.
Prăvălie R, Mitof I, Zaharia L and Bandoc G 2015 Hydroclimatic trends in southwestern Romania between 1961 and 2009 (in French); XXVIIIe Colloque de l’Association Internationale de Climatologie, Liège, Belgium, http://www.climato.be/aic/colloques/actes/ACTES_AIC2015/5%20Variabilites%20et%20aleas%20climatiques/095-PRAVALIE--585--590.pdf.
Prăvălie R, Patriche C V, Sîrodoev I, Bandoc G, Dumitraşcu M and Peptenatu D 2016 Water deficit and corn productivity during the post-socialist period. Case study: Southern Oltenia drylands, Romania; Arid Land Res. Manag. 30. doi:10.1080/15324982.2015.1091399.
Qi W, Zhang Y, Gao J, Yang X, Liu L and Khanal N R 2013 Climate change on the southern slope of Mt. Qomolangma (Everest) region in Nepal since 1971; J. Geogr. Sci. 23 (4) 595–611.
Rîmbu N, Boroneanţ C, Buta C and Dima M 2002 Decadal variability of the Danube river flow in the lower basin and its relation with the North Atlantic Oscillation; Int. J. Climatol. 22 1169–1179.
Reiter A, Weidinger R and Mauser W 2012 Recent climate change at the upper Danube – A temporal and spatial analysis of temperature and precipitation time series; Climatic Change 111 665–696.
Sabzevari A A, Zarenistanak M, Tabari H and Moghimi S 2015 Evaluation of precipitation and river discharge variations over southwestern Iran during recent decades; J. Earth Syst. Sci. 124 335–352.
Salmi T, Määttä A, Anttila P, Ruoho-Airola T and Amnell T 2002 Detecting trends of annual values of atmospheric pollutants by the Mann–Kendall test and Sen’s slope estimates – the Excel template application MAKESENS; ISBN 951–697–563–1, Finnish Meteorological Institute, Helsinki, Finland.
Sandu I, Pescaru V I, Poiana I, Geicu A, Candea I and Tastea D 2008 The climate of Romania (in Romanian); Romanian Academy Publishing, Bucharest, Romania.
Savin C 2004 Rivers in Oltenia: Hydrologic phenomena of exceptional risk (in Romanian); Universitaria Publishing, Craiova.
Savin C 2008 Rivers of Oltenia – hydrologic monograph; Vol. I (Discharge dynamics) (in Romanian); Sitech Publishing, Craiova.
Shahid S 2011 Trends in extreme rainfall events of Bangladesh; Theor. Appl. Climatol. 104 489–499.
Singh D, Glupta R D and Jain S K 2015 Statistical analysis of long term spatial and temporal trends of temperature parameters over Sutlej river basin, India; J. Earth Syst. Sci. 124 17–35.
Ştefan S, Ghioca M, Rîmbu N and Boroneanţ C 2004 Study of meteorological and hydrological drought in southern Romania from observational data; Int. J. Climatol. 24 (7) 871–881.
Steffen W et al. 2011 The Anthropocene: From global change to planetary stewardship; AMBIO 40 739–761.
Sterman J D and Sweeney L D 2007 Understanding public complacency about climate change: Adults’ mental models of climate change violate conservation of matter; Climatic Change 80 213–238.
Stewart I T, Cayan D R and Dettinger M D 2005 Changes toward earlier streamflow timing across western north America; J. Climate 18 1136–1155.
Thornthwaite C W 1948 An approach toward a rational classification of climate; Geogr. Rev. 38 (1) 55–94.
Trabucco A and Zomer R J 2009 Global aridity index (global-aridity) and global potential evapo-transpiration (global-PET) geospatial database; CGIAR consortium for spatial information, CGIAR-CSI GeoPortal, http://www.csi.cgiar.org.
Wagholikar N K, Sinha Ray K C, Sen P N and Pradeep Kumar P 2014 Trends in seasonal temperatures over the Indian region; J. Earth Syst. Sci. 123 673–687.
Zaharia L and Gălie A 2007 Climate change and its impact on the hydrologic regime of rivers in Romania (in French); Papers of the 20th International Climatology Conference, Tunis–Carthage, 3–8 September, pp. 591–596.
Zaharia L and Beltrando G 2009 Flow rate and pluviometry variability and trends in the region of the curvature Carpathians (Romania) (in French); Geographia Technica, Spec. edn, pp. 471–476.
Zarenistanak M, Dhorde A G and Kripalani R H 2014 Trend analysis and change point detection of annual and seasonal precipitation and temperature series over southwest Iran; J. Earth Syst. Sci. 123 281–295.
Zhang X, Harvey K D, Hogg W D and Yuzyk T R 2001 Trends in Canadian streamflow; Water Resour. Res. 37 987–998.
Zhang Y, Zhang S, Xia J and Hua D 2013 Temporal and spatial variation of the main water balance components in the three rivers source region, China from 1960 to 2000; Environ. Earth Sci. 68 973–983.
Zhu J, Gao P, Geissen V, Maroulis J, Ritsema C J, Mu X and Zhao G 2015 Impacts of rainfall and land use on sediment regime in a semi-arid region: Case study of the Wuqi catchment in the upper Beiluo River Basin, China; Arid Land Res. Manag. 29 1–16.
This work was performed as a part of research supported by the UEFISCDI PN-II-PTPCCA–2011–3.2 1427 (Project ECOMAGIS/No. 69/2012) and project COSMOMAR No. 58/2013 financed by STAR Program of ROSA. The authors would like to thank the anonymous reviewers for their highly constructive comments and suggestions that helped to improve this paper.
Corresponding editor: Rajib Maity
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Prăvălie, R., Zaharia, L., Bandoc, G. et al. Hydroclimatic dynamics in southwestern Romania drylands over the past 50 years. J Earth Syst Sci 125, 1255–1271 (2016). https://doi.org/10.1007/s12040-016-0730-x
- Hydroclimatic dynamics
- statistical correlations
- southwestern Romania
- Drincea River
- Desnatui River.