Abstract
Coastal Land use Change has become an important component in current strategies for managing coastal resources and monitoring its environmental changes. This study examines the Landuse conversion and improper aquaculture activities in the coastal region of Nagapattinam SE coast of India. The brackish water aquaculture practices started very extensively since year 2000 onwards where fertile agriculture land, Mudflat areas, swampy land have been converted for the aquaculture ponds. Using temporal satellite data of Landsat ETM+PAN 1999, IRS P6 LISS IV 2007, Lands at OLI 2014 the changes that have been estimated. The results indicate that, the agricultural activity has been on the decrease these years. In addition, the data also suggest that the agricultural lands are decreasing due to increasing brackish water aquaculture activities, mud land, swampy land and waterlogged areas have been converted during last decade. Water quality index indicating in terms of index numbers, offers a useful representation of overall quality of water for public or for any intended use as well as in the pollution abatement programmes and in water quality management. Water quality index was calculated based on the basis of various physical chemical parameters like pH, Electrical conductivity, total dissolved solids, nitrate, calcium, sulfate, magnesium, fluoride, total hardness, sodium, chloride, carbonate and bicarbonate. Groundwater quality results clearly indicate that almost entire PWD selected Controlled well of Nagapattinam Taluk groundwater unsuitable for drinking purpose. It is also observed that the pollution load is relatively pre monsoon season. Average values for the seasons are taken into account the study area slightly alkaline. Chloride is the most important parameter in assessing the water quality. Since 2002 (19.49-excellent water quality) Tirumarugal only suitable for drinking purpose and other areas not suitable for the Period of (1998-2007). Result shows the change that has been occurred during 15 years of period mud land and swampy land, waterlogged areas totally converted to aquaculture activities.
Highlights
Landuse/Landcover changes have become an important component in current strategies for managing natural resources and monitoring environmental changes
The analysis shows that the features like crop lands, Water bodies, and mud land have been decreased when comparing from 1999, 2007, to 2014 (Table 3)
The result of Land use/ landcover and Aquaculture area changes clearly revealed in the trend of Land use and Land cover in Nagapattinam Taluk
Summary
Landuse/Landcover changes have become an important component in current strategies for managing natural resources and monitoring environmental changes. Mapping land cover is essential for global monitoring studies, resource management, and planning activities [1,2,3]. Identification of land cover establishes the baseline from which the change detection can be performed, and provides the ground cover information for baseline thematic maps. Landuse applications involve both baseline mapping and subsequent monitoring and develop strategies to balance conservation, conflicting purposes, and developmental pressures. Issues substantial land use studies removal or disturbance of productive land, urban encroachment, and depletion of forests
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