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Impacts of the Climate Change

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Impacts of the Climate Change Water cycle and water resources management under possible (ongoing) impacts of the climate change Dr. Bashir Ahmad Water Resources Research Institute Islamabad Pakistann The 2nd GEOSS Asia-Pacific Symposium 14th – 16th morning April 2008 Major Rivers of Pakistan Observation Network AWS Installations Sub-basins in Upper Indus Percentage Change – Annual Precipitation Percentage Change – Monsoon Precipitation Percentage Change – Winter Precipitation Projected Water Resources under Climate Change • According to IPCC, TAR (Impacts, Adaptation and Vulnerability, p 563), The average annual runoff in the basin of Indus may decrease by up to 27% Brahmaputra by 14% by the year 2050. The Indus contributes 65% of total river flows • Rainfall may increase in monsoon region but decrease in other parts of the country Future Projections for Climate Change in Asia Region • The GCMs project that average annual mean temperature rise in Asia would be about 2-3°C by 2050; • Dry and arid regions may become dryer and wet regions wetter, (Pakistan is predominately dry and arid); • The projected temperature increase will affect cropping patterns, timings and methods, and overall yields; Glaciers of Upper Indus Basins Total 5,218 Area Source: WRRI, NARC (2005) “ Inventory of glaciers” The Glaciers Distribution in Astor River Basin Study Area 19931993 5 4 3 2 20012001 1 5 4 3 2 1 20052005 5 4 3 2 1 Temporal behavior of Glaciers and Glacial lakes during 1964-2005 Trend of Annual Discharge of Astor River Sub-basins in Upper Indus 10 5 a) Hunza river basin C) ˚ 0 -5 -10 -15 -20 Temperature ( -25 -30 Mean annual JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC Month cycle of Future temperature Present temperature temperature 20 over simulated b) Gilgit river basin C) 10 ˚ with PRECIS 0 -10 for present -20 Temperature ( -30 (1961-90) and JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC future (2071- Month 2100) day Future temperature Present temperature climate [˚C] 20 15 c) Astore river basin C) ˚ 10 5 (Akthar et al. 2005 ) 0 -5 -10 Temperature ( -15 -20 JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC Month Future temperature Present temperature 10 a) Hunza river basin 8 6 4 2 Precipitation (mm/day) Precipitation 0 JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC Mean annual Month cycle of Future precipetation Present precipitation precipitation 7 6 b) Gilgit river basin as simulated 5 4 3 with PRECIS 2 1 for present (mm/day) Precipitation 0 JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC and future Month day climate Future precipitation Present precipitation [mm/day] 10 8 c) Astore river basin (Akthar et al. 2005 ) 6 4 2 Precipitation (mm/day) Precipitation 0 JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC Month Future precipitation Present precipitation 1800 1600 a) Hunza river basin /s) 3 1400 1200 1000 800 600 400 Discharge (m Discharge 200 Annual 0 JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC discharge cycle Month Future Discharge-100% glaciation Future Discharge-50% glaciation simulated by Future Discharge-0% glaciation Present simulated discharge HBV-PRECIS 1400 1200 /s) for the present 3 1000 800 climate and 600 400 Discharge (m 200 future climate 0 JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC for three Month stages of Future Discharge-100% glaciation Future Discharge-50% glaciation glaciation for Future Discharge-0% glaciation Present simulated discharge three river 600 /s) basins 3 400 200 (Akthar et al. 2005 ) Discharge (m 0 JAN FEB MAR APR MAY JUN JUL AUG SEP OCT NOV DEC Month Future Discharge-100% glaciation Future Discharge-50% glaciation Future Discharge-0% glaciation Present simulated discharge MANAGEMENT OF WATER RESOURCESPART-II & ADAPTATION & WATER REQUIREMENT OF PAKISTAN TOTAL WATER RESOURCES AVAILABLE Surface Water availability Water (MAF) Mean river inflows 144 Rainfall 26 Hill torrents 17 Total 187 Groundwater availability 50 Total availability 237 SYSTEM LOSSES • 39 MAF flows into sea • 105 MAF for irrigation • 21 MAF Evaporation/Seepage • 84 MAF reaches the head of water course • 46 MAF reaches fields • 34 MAF available to plants Projected Water Requirement 2025 Present population ~160 million Population between 210-240 million UNDP 240 million World Bank 225 million Government of Pakistan 208 million About 50% more food at present consumption rate and corresponding water requirement of 210 BCM Agricultural Water Demands (MAF) 300 261.14 MAF 250 188.28 MAF 200 168.32 MAF Wheat Cotton 150 Rice S Cane 100 Others Total 50 S CANE COTTON COTTON S CANE S CANE RICE COTTON WHEAT TOTAL OTHERS TOTAL OTHERS TOTAL OTHERS RICE RICE WHEAT 0 WHEAT 1990 2000 2025 INCREASE IN POPULATION Water Management in the Future POORLY MANAGED IRRIGATION SYSTEM DEPLETING GROUND WATER RESOURCES PLANNING COMMISSION VISION 2025 AUGMENTATION MEASURES ¾ RAISING OF MANGLA DAM ¾ HARNESSING HILL STREAMS ¾ EXPLOITING REMAINING GROUNDWATER POTENTIALS PLANNING COMMISSION VISION 2025 Management Measures ¾ Lining canals/watercourses ¾ Changes in cropping pattern ¾ Using high efficiency irrigation techniques Future targets under AWCI • Temporal mapping and database development of cryosphere based on satellite data and field validation • Investigate and quantify the climate change phenomena and hydrological balance • Interrelation of climate change, cryosphere and landuse, and its potential impact on hydrological processes • Water resources management both for operational use and scenario based assessments for planning purposes Expectation from GOESS • Sharing various data sets especially remote sensing • Capacity building in terms of numerical modeling and flood forecasting • Sharing of ideas and experiences .
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