A Hydrological Response Analysis Considering Climatic Variability: Case Study of Hunza Catchment

A. N. Laghari, W. Rauch, M. A. Soomro

Abstract


The hydrological response of mountainous catchments particularly dependent on melting runoff is very vulnerable to climatic variability. This study is an attempt to assess hydrological response towards climatic variability of the Hunza catchment located in the mountainous chain of greater Hindu Kush-Himalaya (HKH) region. The hydrological response is analyzed through changes in snowmelt, ice melt and total runoff simulated through the application of the hydrological modeling system PREVAH under hypothetically developed climate change scenarios. The developed scenarios are based on changes in precipitation (Prp) and temperature (Tmp) and their combination. Under all the warmer scenarios, the increase in temperature systematically decreases the mean annual snow melt and increases significantly glacier melt volume. Temperature changes from 1°C to 4°C produce a large increase in spring and summer runoff, while no major variation was observed in the winter and autumn runoff. The maximum seasonal changes recorded under the Tmp+4°C, Prp+10% scenario.


Keywords


mountain region; Hunza catchment; melting contribution; water resources

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References


J. Briscoe, U. Qamar, Pakistan’s Water Economy: Running Dry, Oxford University Press, 2009

A. N. Laghari, D. Vanham,l W. Rauch, “To what extend does climate change result in a shift in Alpine hydrology? A case study of Austrian Alps”, Hydrological Sciences Journal, Vol. 57, No. 1, pp. 103-117, 2012

IPCC, 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, 2007

P. Singh, S. K. Jain, N. Kumar, “Snow and glacier melt runoff contribution in the Chenab river at Akhnoor”, Mountain Research Development, Vol. 17, pp. 49–56, 1997

D. Vanham, E. Fleischhacker, W. Rauch, “Impact of an extreme dry and hot summer on water supply security in an alpine region”, Water Science and Technology, Vol. 59, No. 3, pp. 469-477, 2009

D. Vanham, E. Fleischhacker, W. Rauch, “Impact of snowmaking on alpine water resources management under present and climate change conditions”, Water Science and Technology, Vol. 59, No. 9, pp. 1793-1801, 2009

P. Singh, L. Bengtsson, “Hydrological sensitivity of a large Himalayan basin to climate change”, Hydrological Processes, Vol. 18, pp. 2363–2385, 2004

D. Viviroli, M. Zappa, J. Gurtz, R. Weingartner, “An introduction to the hydrological modelling system PREVAH and its pre- and post-processing-tools”, Environmental Modelling & Software, Vol. 24, No. 10, pp. 1209–1222, 2009

M. Verbunt, M. Zappa, J. Gurtz, P. Kaufmann, “Verification of a coupled hydro meteorological modelling approach for alpine tributaries in the Rhine basin”, Journal of Hydrology, Vol. 324, No. 1-4, pp. 224–238, 2006




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