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STUDY OF SPATIAL TEMPORAL INTER RELATIONSHIPS BETWEEN CROP AREAS AND SURFACE WATER SPREAD

KrishiKosh

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Title STUDY OF SPATIAL TEMPORAL INTER RELATIONSHIPS BETWEEN CROP AREAS AND SURFACE WATER SPREAD
 
Creator YOGITHA, P
 
Contributor MANI, A
 
Subject irrigation, area, precipitation, crops, surface water, seasons, diseases, biological phenomena, land resources, remote sensing
 
Description Availability of surface water resources in a river basin is a key and critical parameter
in water resources planning and management. Estimation of water resources through
conventional methods at spatio-temporal scale is a huge task and hence cannot be
repeated and carried out in near real time scale. In view of this, spatial information
technologies such as Remote Sensing (RS) and GIS methods have been explored for
this purpose and made use for the study of surface water dynamics vis-à-vis rainfall
pattern, its distribution and seasonal crop area estimates. The present study has used
satellite data from IRS P6 – Resourcesat-1 AWiFS sensor for the years 2004-2011 to
study the surface water spread dynamics. Automated water spread extraction
algorithm developed by NRSC has been used for the quick processing of satellite data
and delineate inter/intra seasonal surface water spread areas for the last 7 years during
Kharif and Rabi seasons. The trends in surface water spread area (WSA) variations
have been presented at river sub basin level, and also at Godavari basin level and
relationships with rainfall pattern, seasonal crop area estimates were also discussed in
detail in the study. It was observed that the maximum water spread is 5.09 lakh ha
out of Geographical area of 30 Mha of Godavari basin which is 1.69 % ; and
minimum water spread is 2.45 lakh ha (0.81%) during 2004-05 and 2010-11
respectively. However, the majority of years had water spread area of ~ 4.00 lakh ha
and above. It was noted that the 50-70% of surface water spread is contributed from
larger water bodies across the sub-basin and rest is from smaller irrigation tanks / rain
fed tanks. Hence, the study results can be made use for inputs to the development of
indicators for the assessment of agricultural drought which occurs in many parts of
the country in India. Satellite derived seasonal crop areas indicate that Kharif crop
area grown in Godavari basin is ranging from 127.91 lakh ha (2005-06) to 150.48
lakh ha (2009-10). Rabi crop area grown in Godavari basin is ranging from 48.90
(2004-05) to 69.51 lakh ha (2010-11). It appears that the WSA observed during
Sep/Oct will have direct relationship with the Rabi crop area in different study years.
The efforts made in this study on surface water spread dynamics are very fruitful and
huge database on Godavari basin has been generated in respect of spatio-temporal
satellite data water spread. The results are very much relevant for the climate change
study groups. Quick image processing techniques that were used for automatic
delineation of water bodies, and the approach can be extended to conduct the similar
analysis at national level to study the impact of climate change on the availability of
water resources in India.
 
Date 2016-06-07T14:30:31Z
2016-06-07T14:30:31Z
2011
 
Type Thesis
 
Identifier http://krishikosh.egranth.ac.in/handle/1/66959
 
Language en
 
Relation D9084;
 
Format application/pdf
 
Publisher ACHARYA N. G. RANGA AGRICULTURAL UNIVERSITY