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
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Creator |
YOGITHA, P
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Contributor |
MANI, A
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Subject |
irrigation, area, precipitation, crops, surface water, seasons, diseases, biological phenomena, land resources, remote sensing
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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. |
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Date |
2016-06-07T14:30:31Z
2016-06-07T14:30:31Z 2011 |
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Type |
Thesis
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Identifier |
http://krishikosh.egranth.ac.in/handle/1/66959
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Language |
en
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Relation |
D9084;
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Format |
application/pdf
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Publisher |
ACHARYA N. G. RANGA AGRICULTURAL UNIVERSITY
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