Abstract:
The natural process and man-made activities in the
watershed have influenced the climate change and
induce the hydrology of the watershed along the
temporal scale. Increase in emission of greenhouse
gas into atmosphere might induce in climate pattern
in future. Many researchers have been incorporated
climatologicall cycle and its variability into the
water resources system modelling in the recent past.
Change on climate could affect the metrological
parameters and which directly lead to change in
irrigation water requirement in agriculture. In this
study, an effort has been made to assess the impact
of climate change on crop water requirement in
Sunei command area (Bhudhabalang Basin) of
Mayurbhanj district Odisha, India. For this study,
daily meteological data like maximum temperature ,
minimum temperature, wind speed, sunshine hours,
humidity and precipitation data are used. Crops and
cropping pattern data are used for the study area.
Future climate data predicate for the period 2025,
2050 and 2080 considering both A2 and B2 scenario
using GCM HadCM3. Crop evapotranspiration
(ETo ) was calculated using mean monthly climate
and rainfall data with help of CROPWAT 8.0. Then
crop water requirement (CWR) was determined for
each crop of the project area of the study area.
Results confirm the clear impact of climate change
on crop water requirement of Kharif and Rabi crops.
It shows that both H3A2 and H3B2 scenarios crop
water requirements increases where as for some
Rabi season crops like Dalua rice, Groundnut,
Mustard crop water requirements decreases in
future for H3B2 scenario. The increase or decrease
are consider compared to base period 2010. To meet
the increase water demand and to increase yield for
future, water resources can be increased by doing
water conservation practices, small barrages and
farm ponds near command area. Groundwater
should be used as conjunctive use at peak
requirement period.
