International Journal of Remote Sensing · 1985 · 18 citations · 2 references
AgricultureAgronomyGeographyCropping SystemsIrrigation ManagementRemote SensingAgricultural Land ManagementIrrigationLand Cover Change DetectionLand UseLand Use Change DetectionRemote Sensing Change DetectionAgricultural ImageryArea CommandCommand Area MappingCrop MappingCroppingCropping Pattern AnalysisEcological StudiesLand Degradation Mapping
Abstract The present study was directed towards studying the impact of the Ukai-Kakrapar irrigation project on the ecology of the command area with particular reference to changes in cropping pattern and land degradation due to waterlogging/salinity. The data used were multitemporal (1972-1981) LANDSAT imagery of the entire command area, multitemporai colour infrared plus black-and-white aerial photography and multispectral scanner data over a test area of about 1200 km2 collected from November 1980 to February 1982. Land-use maps for the entire command area at 1:250 000 scale (LANDSAT) and land-use/cropping-pattern maps for the test area at 1:12 500 scale (aerial photography) have been prepared. The results indicate that due to the introduction of large-scale irrigation, the cropping pattern has changed and the acreage under heavy perennial crops such as sugar-cane and banana has increased beyond permissible limits resulting in a rapid rise in the water-table in the area. The areas delineated as waterlogged and salt-affected from the aerial and LANDSAT imagery, when correlated with the subsoil water-table data, were found to have the water-table within 0-1 5 to 1-5-3-0 m.
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