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BY,
ANEESH MATHEW,ID:2012PCW5182,M.TECH(WRE).
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INTRODUCTION Climate change impacts are going to be most severe in the
developing world because of their poor capacity to adopt
climate variability.
NATCOM, the present study has been taken up to quantify
the impact of climate change of the water resources of
Indian river systems.
The study uses the HadRM2 daily weather data todetermine the spatio-temporal water availability in the
river systems. A distributed hydrological model namely
SWAT has been used.
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METHEDOLOGY The climate change impact assessment on water resources
can be best handled through simulation of the
hydrological conditions that shall prevail under the
projected weather conditions in an area.
The SWAT water balance model is one such model and
has been used in the present study to carry out the
hydrological modeling of the river basins of the country.
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SWAT The SWAT model simulates the hydrologic cycle at daily
time basis.
SWAT is a distributed , continuous, hydrological modelwith an Arc View GIS interface(AVSWAT). The interface
is used for pre and post processing of the data and outputs.
It is used to predict the impact on climate change on the
availability of water resources under GHG with theassumption that land use will not change with time.
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DATA
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WEATHER DATA
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DIGITAL ELEVATION MODEL
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DILINEATION OF THE RIVER
BASINS It is done by using DEM as input and the final outflow
point on the drain age of the river basin as the final
pour/drainage point.
River basins have been divided into sub basins using an
arbitrarily selected threshold value.
It also provides the number of the sub basins the river
basins got subdivided into as a result of this threshold. The total area of the river basin as obtained from the
automatic delineation has also been provided.
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MODELLED RIVER BASIN ALONG WITH RCM
GRID LOCATIONS
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RESULTS OF BASIN ANALYSIS
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LAND COVER OR LAND USE LAYER Classified land cover data (13 categories) produced by the
university of Maryland Global land cover facility, using
remote sensing with resolution of 1km grid cell has been
used.
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SOIL LAYER Soil map adopted from FAO digital map of the world and
derived soil properties with a resolution of 1:5000000
have been used.
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CONTROL CLIMATE
SCENARIO Represents the simulated baseline weather conditions.
Simulated using SWAT model by using this generated
daily weather data (HadRM2). Simulated weather report has been used for control period.
The model represents detailed outputs on flows, actual
evapotranspiration, soil moisture status at daily level.
Additional subcomponents of the total water balance suchas surface runoff, inter flow, sub surface runoff etc.
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GHG CLIMATE SCENARIO Using GHG climate scenario data without changing
the land use.
Detailed analysis have been performed on the river
basins to quantify the impacts at the sub basin levels.
Shorter time interval in the month has been used.
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SUMMARY RESULTS ON CLIMATE IMPACT
CHANGE ON INDIAN RIVER BASINS
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ANNUAL WATER BALANCE COMPONENTS
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KRISHNA RIVER BASIN
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KRISHNA RIVER BASIN The variation in mean annual water balance components
from control to GHG scenario both in terms of change in
individual values of these components and percentage of
change over control.
Reduction in precipitation by about 20% of the current
value has been predicted in the sub basins of Krishna.
Decrease in water yield over the sub basins is predicted tovary from 30% to 50%.
Actual evapotranspiration is predicted to reduce by about
5% over most of the basins.
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DROUGHT ANALYSIS Used for the assessment of drought severity by indicating
relative dryness or wetness.
PDSI is the widely used index that incorporates
information on rainfall, land use and soil properties in the
lumped manner.
PDSI value below 0 indicates the beginning of drought
situation and value below -3 indicates severe droughtcondition.
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DROUGHT ANALYSIS
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DROUGHT ANALYSIS
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MAHANADI RIVER BASIN
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MAHANADI RIVER BASIN
It has been selected as the one which has been
predicted to have maximum impact on account of theflood conditions.
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MAHANADI RIVER BASIN
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MAHANADI RIVER BASIN
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MAHANADI RIVER BASIN
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MAHANADI RIVER BASIN
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MAHANADI RIVER BASIN
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MAHANADI RIVER BASIN
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MAHANADI RIVER BASIN
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MAHANADI RIVER BASIN
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MAHANADI RIVER BASIN
FLOOD ANALYSIS
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MAHANADI RIVER BASIN
FLOOD ANALYSIS
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ADAPTATION ISSUES Strategy for copying with the climate change impacts
on water resources can be no different from the
present day strategy of copying with the ever
increasing demands on the precious resource.
The best way forward is to incorporate such
interventions through a unified framework which can
be conductive to integrated approach.
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COPYING ACTIVITIES MAY INCLUDE
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GAPS AND FUTURE DIRECTION OF
STUDIES The hotspots have been identified only with respect to
the natural boundaries in the form of sub basins of the
river systems.
Another gap which shall be required to be addressed
in an institutional capacity building at various levels.
The creation of unified framework and its
maintenance shall be a gigantic task which can beachieved only through major policy restructuring of
the institutions at different levels of management.
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CONCLUTION
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THANK YOU