Change detection analysis along the coast of ramanathapuram district, tamil nadu, india using geospatial techniques

Vijay Prabhu, M and Venkateswaran, S

The Coastal shoreline worldwide is changing rapidly as a result of natural physical processes and human activities. Assessment of the coastal zone is likely to undergo the most profound change in the near future. Consequently, environmental management and planning are severe conflicts over coastal resource. The degradation of natural resources will close development options in the coastal. In addition to the population pressure, the world’s coastal areas are highly vulnerable to climate change. The rising sea level, as well as to changes in rainfall, storm frequency, and intensity. Inundation, flooding, erosion, and saltwater intrusion are only a few of the potential impacts of climate change. Ramanathapuram district coast has totally about 270 km coastline. Coastal zone monitoring and coastline extraction is a fundamental work for further change detection analysis. Coastline, the coastal zone assessment requires the information about coastline changes. The estimate the coastline changes for a period of 2000 to 2015 using RS and GIS. In this research, satellite data of 2000 and 2015 in order to deduce changed. Different image processing techniques have been carried out to enhance the changes during the study period. Supervised and unsupervised classification, band selection and masking were applied using ERDAS software. These changes were perpetual. However, the coastline has been changed significantly from 2000 to 2015. A new approach was employed for coastline extraction, for which a histogram threshold together with band ratio techniques was utilized. In order to assess the accuracy of the results, they have been compared with ground truth observations. Coastal plains, older deltaic plains, cuspate foreland, teri sand mounds, teri tidal complex are some of the geomorphic features observed in the coastal stretch. The coastline in this stretch is fringed by a sand sandy plain over a width of about 1.5km to 3km. Beyond which runs a wide track of fluvio marine sediments manifested in tidal flat, salt marsh and paleo tidal flat. The coastline between Rameswaram and Mandapam is a huge cuspat foreland bar built up with sand deposits representing repeated lowering of sea level.

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Vijay Prabhu, M and Venkateswaran, S, 2016. Change detection analysis along the coast of ramanathapuram district, tamil nadu, india using geospatial techniques. International Journal of Current Science and Technology. Vol.4, Issue, 11, pp. 298-303