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Impacts of Climate Change on Water Resources

This document outlines the objectives and research tasks of the Indo-UK Programme on Climate Change Impacts in India workshop held in Delhi in 2002. It includes analysis of spatio-temporal variability of precipitation, evaluation of climate model simulations, past changes in water availability and quality, and development of future scenarios under different climate change scenarios.

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Impacts of Climate Change on Water Resources

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  1. Impacts of Climate Change on Water Resources INDIAN INSTITUTE OF TROPICAL METEOROLOGY G.B. Pant Indo-UK Programme on Climate Change Impacts in India : Delhi Workshop, Sep. 5-6, 2002

  2. The People • Dr. G.B. Pant (PI) • Dr. K. Rupa Kumar • Mr. B.N. Mandal • Dr. K. Krishna Kumar • Dr. B.D. Kulkarni • Mrs. N.R. Deshpande • Collaborators/Consultants: • Dr. K.S. Ramasastri, National Institute of Hydrology

  3. OUTLINE • Objectives • Research Tasks • Indian rainfall variability • Baseline precipitation analysis • Precipitation climatology of major river basins • Spatio-temporal variability of precipitation over major river basins • Evaluation of HadRM2 simulations of precipitation over major river basins

  4. Objectives • Analysis of spatio-temporal variability of precipitation over major river basins of India • Study of past changes in water availability and their sensitivity to climate variability and land-use/land-cover changes • Evaluation of regional climate model simulations of precipitation • Study of past changes in water quality • Development of future scenarios for water availability and quality under different climate change scenarios

  5. Research Tasks • Identification of target river basins • Baseline precipitation analysis: Precipitation climatology of major river basins; Spatio-temporal variability of precipitation • Evaluation of HadRM2 simulations of monthly/daily precipitation over major river basins • Case studies of past changes in water availability and quality in relation to climate and land-use/land-cover changes • Hydrometeorological analysis of HadRM2 simulations for major river basins • Water availability scenarios for major river basins including the scenarios for the impacts of land use and cover • Identification of critical areas and frequency/impacts of extreme events

  6. Mean Rainfall PatternsData Source: CMAP (1979-2000) Summer Monsoon (mm/season) Annual (mm/year)

  7. Indian Summer Monsoon Contribution to Annual Rainfall and its VariabilityData Source : CMAP (1979-2000) Monsoon/Annual (%) Coefficient of Variation (%)

  8. The Stability of the Indian Summer Monsoon

  9. Temporal scales of monsoon variability Features Factors

  10. Rainfall Data • Homogeneous monthly rainfall data set for 306 stations (1871-2001) • Daily rainfall data at 500-1000 raingauge stations during 1901-90 (variable network)

  11. Change in Raingauge Network Density (1871-1992)

  12. Raingauge Network for Daily Rainfall Data

  13. All-India Summer Monsoon Rainfall (1871-2001)(Based on IITM Homogeneous Monthly Rainfall Data Set)

  14. Long-term Trends in Indian Summer Monsoon Rainfall

  15. Major River Basins of India

  16. Identification of Target River Basins • 66 notable river basins • 3 large river basins identified : Ganga, Godavari and Krishna • Summer monsoon main source of water for all the three basins

  17. Seasona Precipitation : GANGA

  18. Seasonal Precipitation : GODAVARI

  19. Seasonal Precipitation : KRISHNA

  20. Variation of Basin-mean Precipitation: GANGA

  21. Variation of Basin-mean Precipitation: GODAVARI

  22. Variation of Basin-mean Precipitation: KRISHNA

  23. Extreme Rainfall in River Basins • Short-duration extremes in rainfall have profound influence on the water availability as well as flood-related issues • 1-3 day extreme rainfall patterns have been analysed to study this aspect

  24. Extreme Rainfall : GANGA

  25. Extreme Rainfall : GODAVARI

  26. Extreme Rainfall : KRISHNA

  27. All-India Mean Monthly Rainfall

  28. All-India Seasonal Rainfall

  29. Godavari Annual Cycles of Rainfall in Major River Basins of India Ganga Krishna

  30. Capital Equipment • A high-end workstation along with PCs and on-line UPS have been acquired for the project

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