Abstract
Assessment of climate and land use changes impact including extreme events on the sediment yield is vital for water and power stressed countries. Mangla Reservoir is the second-largest reservoir in Pakistan, and its capacity is being reduced due to rapid sedimentation and will be threatened under climate and land use changes. This paper discusses the consequences of climate and land use change on sediment yield at Mangla Dam using General Circulation Models (GCMs), Land Change Modeler (LCM), Soil and Water Assessment Tool (SWAT) model after calibration and validation. Results show that over the historical period temperature is observed to increase by 0.10oC/decade and forest cover is observed to reduce to the level of only 16% in 2007. Nevertheless, owing to the forest conservation policy, the forest cover raised back to 27% in 2012. Anticipated land use maps by using LCM of 2025, 2050 and 2100 showed that the forest cover will be 33%, 39.2%, and, 53.7%, respectively. All seven GCMs projected the increase in temperature and five GCMs projected an increase in precipitation, however, two GCMs projected a decrease in precipitation. Owing to climate change, land use change and combined impact of climate and land use change on annual sediment yield (2011-2100) may vary from -42.9% to 39.4%, 0% to -27.3% and, -73% to 39.4%, respectively. Under climate change scenarios projected sediment yield is mainly linked with extreme events and is expected to increase with the increase in extreme events. Under land use change scenarios projected sediment yield is mainly linked with the forest cover and is expected to decrease with the increase in forest cover. The results of this study are beneficial for planners, watershed managers and policymakers to mitigate the impacts of climate and land use changes to enhance reservoir life by reducing the sediment yield.
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Acknowledgments
All authors would like to take this opportunity to recognize and offer appreciation to Climate Forecast System Reanalysis (CFSR), India Meteorological Department (IMD), Pakistan Meteorological Department (PMD), and Surface Water Hydrology Project (SWHP) of Power Development Authority (WAPDA) of Pakistan, for providing the required valuable data for this study. Genuine gratitude is extended to the University of Central Punjab, Lahore, Pakistan, Higher Education Commission (HEC) of Pakistan and Asian Institute of Technology (AIT), Thailand for providing continuous support.
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Integrated assessment of extreme climate and landuse change impact on sediment yield in a mountainous transboundary watershed of India and Pakistan
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Babur, M., Shrestha, S., Bhatta, B. et al. Integrated assessment of extreme climate and landuse change impact on sediment yield in a mountainous transboundary watershed of India and Pakistan. J. Mt. Sci. 17, 624–640 (2020). https://doi.org/10.1007/s11629-019-5547-z
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DOI: https://doi.org/10.1007/s11629-019-5547-z