Temperature and Precipitation Trends in Lebanon’s Largest River: The Litani Basin
Publication: Journal of Water Resources Planning and Management
Volume 139, Issue 1
Abstract
This study deals with the historical hydro-climatological watershed characteristics of the Litani basin located in Lebanon, east of the Mediterranean Sea, during 1900–2008. The basin is divided into two distinct sub-basins. The Upper Litani Basin (ULB) is mostly dominated by mountainous geophysical features and the Lower Litani Basin (LLB) is closer to the Mediterranean coast. Monthly and annual temperature and precipitation data were generated from different sources, including global gridded data, satellite data, and local station data. Because long-term runoff records were not available, previously generated monthly synthetic runoff data were employed. Temperature and precipitation trends were investigated using the Mann-Kendall and Sen Slope nonparametric trend tests. The mean annual and monthly runoff were subsequently correlated with temperature and precipitation variations using a multiple linear regression approach. The results show that between 1900 and 2008, the whole Litani basin, including both sub-basins, experienced a drying trend without a significant change in temperature. However, within the period of 1970–2008, the whole basin grew notably warmer in all seasons, without being wetter; this climatic pattern was reflected in the LLB but not in the ULB, which was only slightly warmer, but also slightly wetter in this period. In addition, the results revealed distinctive seasonal and annual correlations between temperature and precipitation changes and the basin’s runoff. However, runoff for both the ULB and the LLB was shown to more frequently correlate with precipitation than with temperature. Positive correlations were found between runoff and precipitation during winter and wet seasons, and a negative correlation was detected during winter between temperature and runoff variations of the ULB. Hence, the continuation of increasing temperature and decreasing precipitation trends may pose a threat to future water resources in the Litani as a whole, and the ULB in particular.
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References
Abd-el-Al, I. (1993). “The complete work.” The friends of Abd-el Al, Beirut, Lebanon, 〈http://www.ibrahim-abdelal.org〉 (July 11, 2010).
Bates, B., Kundzewicz, Z., Wu, S., and Palutikof, J. P. (2008). “Climate change and water.” Technical Paper of the Intergovernmental Panel on Climate Change, IPCC Secretariat, Geneva.
Beighley, R. E., Eggert, K., Dunne, T., He, Y., and Gummadi, V. (2009). “Simulating hydrologic and hydraulic processes throughout the Amazon River Basin.” Hydrol. Processes, 23(8), 1221–1235.
Bou-Zeid, E., and El-Fadel, M. (2002): “Climate change and water resources in Lebanon and the Middle East.” J. Water Resour. Plann. Manage., 128(5), 343–355.
Giorgi, F. (2002). “Variability and trends of sub-continental scale surface climate in the twentieth century. Part I: Observations.” Clim. Dynam., 18(8), 675–691.
Hatzianastassiou, N., Katsoulis, B., Pnevmatikos, J., and Antakis, V. (2008). “Spatial and temporal variation of precipitation in Greece and surrounding regions based on global precipitation climatology project data.” J. Clim., 21(6), 1349–1370.
Huffman, G. J. et al. (2007). “The TRMM multi-satellite precipitation analysis: Quasi-global, multi-year, combined-sensor precipitation estimates at fine scale.” J. Hydrometeorol., 8(1), 38–55.
Huntington, T. G. (2006). “Evidence for intensification of the global water cycle: Review and synthesis.” J. Hydrol. (Amsterdam), 319, 83–95.
Intergovernmental Panel on Climate Change (IPCC). (2007a). “Climate change 2007: Impacts, adaptation and vulnerability.” Contribution of Working Group II to the Fourth Assessment, Rep. of the Intergovernmental Panel on Climate Change, Parry, M. L., Canziani, O. F., Palutikof, J. P., van der Linden, P. J., and Hanson, C. E., eds., Cambridge Univ. Press, Cambridge, UK, 976.
IPCC. (2007b). “Climate change 2007: Synthesis report.” Contribution of Working Groups I, II and III to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change, Pachauri, R. K., and Reisinger, A., eds., IPCC, Geneva, Switzerland, 104.
Jacobeit, J. (2000). “Rezente Klimaentwicklung im Mittelmeerraum.” Petermanns Geographische Mitteilungen, Vol. 144, Der Mittelmeerraum, Gotha, 22–35.
Jacobeit, J., Dünkeloh, A., and Hertig, E. (2004). “Die Niederschlagsarmut im mediterranen Raum und ihre Ursachen.” Warnsignal Klima: Geng Wasser Für alle? Lozán, J. L., Graβl, H., Hupfer, P., Menzel, L., and Schönwiese, C. D., eds., Wissenschaftliche Auswertungen, Hamburg, 192–196.
Kendall, M. G. (1975). Rank correlation methods, Charles Griffin, London.
Kulkarni, A., and von Storch, H. (1995). “Monte Carlo experiments on the effect of serial correlation on the Mann-Kendall-test of trends.” Meteor. Z., 4(2), 82–85.
Kachigan, S. K. (1986). Statistical analysis: An interdisciplinary introduction to univariate and multivariate methods, Radius Press, New York.
Kleinbaum, D. G., Kupper, L. L., Muller, K. E., and Nizam, A. (1998). Applied regression analysis and other multivariable methods, 3rd Ed., Duxbury Press, Brooks/Cole Publishing Company, Pacific Grove, California.
Kundzewicz, Z. W. et al. (2007). “Freshwater resources and their management.” Climate change 2007: Impacts, adaptation and vulnerability, contribution of Working Group II to the fourth assessment rep. of the Intergovernmental Panel on Climate Change, Parry, M. L., Canziani, O. F., Palutikof, J. P., van der Linden, P. J., and Hanson, C. E., eds., Cambridge Univ. Press, Cambridge, UK.
Lionello, P., Malanotte-Rizzoli, P., and Boscolo, R. (2006). “Mediterranean climate variability.” Developments in earth and environmental sciences, 4, Elsevier, Boston.
Litani River Authority (LRA). 〈http://www.litani.gov.lb/river.html〉 (March 8, 2011).
López-Moreno, J., Goyette, I. S., and Beniston, M. (2009). “Impact of climate change on snowpack in the Pyrenees: Horizontal spatial variability and vertical gradients.” J. Hydrol. (Amsterdam), 374, 384–396.
Loukas, A., Vasiliades, L., and Dalezios, N. R. (2002). “Potential climate change impacts on flood producing mechanisms in southern British Columbia, Canada using the CGCMA1 simulation results.” J. Hydrol. (Amsterdam), 259(1–4), 163–188.
Matalas, N. C., and Lanbein, W. B. (1962). “Information content of the mean.” J. Geophys. Res., 67(9), 3441–3448.
Matsuura, K., and Willnott, C. J. (2007). Terrestrial air temperature and precipitation: 1900–2006 gridded monthly time series, Dept. of Geography, Univ. of Delaware, Newark, DE.
Mitchell, T. D., and Jones, P. D. (2005). “An improved method of constructing a database of monthly climate observations and associated high-resolution grids.” Int. J. Climatol., 25, 693–712.
NASA. (2009). ASTER Global Digital Elevation Map, Jet Propulsion Laboratory, California Institute of Technology, Japan’s Ministry of Economy, Trade and Industry (METI), Sioux Fall, South Dakota.
New, M., Todd, M., Hulme, M., and Jones, P. (2001). “Precipitation measurements and trends in the twentieth century.” Int. J. Climatol., 21(15), 1899–1922.
Norrant, C., and Douguédroit, A. (2006). “Monthly and daily precipitation trends in the Mediterranean (1950–2000).” Theor. Appl. Climatol, 83, 89–106.
Pfister, L., Humbert, J., and Hoffmann, L. (2000). “Recent trends in rainfall-runoff characteristics in the Alzette River Basin, Luxembourg.” Clim. Change, 45, 323–327.
Ramadan, H. H., Beighley, R. E., and Ramamurthy, A. S. (2012). “Modelling streamflow trends for a watershed with limited data: A case on the Litani, Lebanon.” Hydrol. Sci. J., 57(8), 1516–1529.
Sahsamanoglou, H. S., and Makrogiannis, T. J. (1992). “Temperature trends over the Mediterranean region, 1950–1988.” Theor. Appl. Climatol., 45, 183–192.
Seemann, S. W., Li, J., Menzel, W. P., and Gumley, L. E. (2003). “Operational retrieval of atmospheric temperature, moisture, and ozone from MODIS infrared radiances.” J. Appl. Meteorol., 42, 1072–1091.
Sen, P. K. (1968). “Estimates of the regression coefficient based on Kendall’s tau.” J. Am. Stat. Assoc., 63, 1379–1389.
Türkeş, M., Sümer, U. M., and Demir, I. (2002). “Re-evaluation of trends and changes in mean, maximum and minimum temperatures of Turkey for the period 1929–1999.” Int. J. Climatol., 22, 947–977.
Xoplaki, E. (2002). “Climate variability over the Mediterranean.” Ph.D. dissertation, Univ. of Bern, Switzerland.
Zhang, X. et al. (2005). “Trends in Middle East climate extreme indices from 1950 to 2003.” J. Geophys. Res., 110(D22), CiteID D22104, 12.
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Published In
Journal of Water Resources Planning and Management
Volume 139 • Issue 1 • January 2013
Pages: 86 - 95
Copyright
© 2013 American Society of Civil Engineers.
History
Received: Apr 13, 2011
Accepted: Feb 28, 2012
Published online: Mar 3, 2012
Published in print: Jan 1, 2013
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