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Impacts of Climate Change on the Water Availability, Seasonality and Extremes in the Upper Indus Basin (UIB)

Author

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  • Asim Jahangir Khan

    (Department of Geohydraulics and Engineering Hydrology, University of Kassel, 34127 Kassel, Germany
    Department of Environmental Sciences, COMSATS University Islamabad, Abbottabad Campus, University Road, Abbottabad 22060, Pakistan)

  • Manfred Koch

    (Department of Geohydraulics and Engineering Hydrology, University of Kassel, 34127 Kassel, Germany)

  • Adnan Ahmad Tahir

    (Department of Environmental Sciences, COMSATS University Islamabad, Abbottabad Campus, University Road, Abbottabad 22060, Pakistan)

Abstract

Projecting future hydrology for the mountainous, highly glaciated upper Indus basin (UIB) is a challenging task because of uncertainties in future climate projections and issues with the coverage and quality of available reference climatic data and hydrological modelling approaches. This study attempts to address these issues by utilizing the semi-distributed hydrological model “Soil and water assessment tool” (SWAT) with new climate datasets and better spatial and altitudinal representation as well as a wider range of future climate forcing models (general circulation model/regional climate model combinations (GCMs_RCMs) from the “Coordinated Regional Climate Downscaling Experiment-South Asia (CORDEX-SA) project to assess different aspects of future hydrology (mean flows, extremes and seasonal changes). Contour maps for the mean annual flow and actual evapotranspiration as a function of the downscaled projected mean annual precipitation and temperatures are produced and can serve as a “hands-on” forecast tool of future hydrology. The overall results of these future SWAT hydrological projections indicate similar trends of changes in magnitudes, seasonal patterns and extremes of the UIB—stream flows for almost all climate scenarios/models/periods—combinations analyzed. In particular, all but one GCM_RCM model—the one predicting a very high future temperature rise—indicated mean annual flow increases throughout the 21st century, wherefore, interestingly, these are stronger for the middle years (2041–2070) than at its end (2071–2100). The seasonal shifts as well as the extremes follow also similar trends for all climate scenario/model/period combinations, e.g., an earlier future arrival (in May–June instead of July–August) of high flows and increased spring and winter flows, with upper flow extremes (peaks) projected to drastically increase by 50 to >100%, and with significantly decreased annual recurrence intervals, i.e., a tremendously increased future flood hazard for the UIB. The future low flows projections also show more extreme values, with lower-than-nowadays-experienced minimal flows occurring more frequently and with much longer annual total duration.

Suggested Citation

  • Asim Jahangir Khan & Manfred Koch & Adnan Ahmad Tahir, 2020. "Impacts of Climate Change on the Water Availability, Seasonality and Extremes in the Upper Indus Basin (UIB)," Sustainability, MDPI, vol. 12(4), pages 1-27, February.
    • Handle: RePEc:gam:jsusta:v:12:y:2020:i:4:p:1283-:d:318930
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    References listed on IDEAS

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    1. P. C. D. Milly & K. A. Dunne & A. V. Vecchia, 2005. "Global pattern of trends in streamflow and water availability in a changing climate," Nature, Nature, vol. 438(7066), pages 347-350, November.
    2. Behrooz Keshtegar & Mohammed Falah Allawi & Haitham Abdulmohsin Afan & Ahmed El-Shafie, 2016. "Optimized River Stream-Flow Forecasting Model Utilizing High-Order Response Surface Method," Water Resources Management: An International Journal, Published for the European Water Resources Association (EWRA), Springer;European Water Resources Association (EWRA), vol. 30(11), pages 3899-3914, September.
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    1. Muhammad Shafeeque & Yi Luo & Arfan Arshad & Sher Muhammad & Muhammad Ashraf & Quoc Bao Pham, 2023. "Assessment of climate change impacts on glacio-hydrological processes and their variations within critical zone," Natural Hazards: Journal of the International Society for the Prevention and Mitigation of Natural Hazards, Springer;International Society for the Prevention and Mitigation of Natural Hazards, vol. 115(3), pages 2721-2748, February.

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