Abstract
AbstractOnce open-pit mining activities are abandoned and dewatering stops, pit lakes emerge. Mining activities started at Raniganj coalfield (RCF) in West Bengal in 1774 during the British East India era, containing about 1306 sq. km. For the last few decades, open-cast mine practice has become increasingly common, and as a result open pit is formed. The main objective of this study is to assess the water quality and landscape dynamics of some selected Pit lakes in RCF, West Bengal, India, with special reference to Andal C.D Block to evaluate the suitability of the pit lake resources in terms of sustainability and socioeconomic aspects. Various physico-chemical parameters (i.e. pH, conductivity, TDS, total alkalinity, total hardness, chloride, nitrate, phosphate, DO and BOD) using pre-monsoon, monsoon and post-monsoon pit lake water sample data, water quality index and geospatial technology adopted to analyse water chemical properties along with their spatial and temporal dimension. Genesis and evolution of these pit lakes are analysed using satellite imagery archive in GIS (Geographic Information System) platform. Spectral indices, land surface temperature and land use/land cover thematic map are prepared in a temporal scale through Landsat satellite imagery (Landsat 5 TM, Landsat7 ETM+ and Landsat8 OLI) using ArcGIS10.1 to gather knowledge about the landscape dynamics surroundings of pit lakes. For the evaluation, the overall hydrological status, landscape dynamics and effectiveness, quality assessments of 12 selected pit lakes in the Andal Block (RCF region) are being carried out to establish approaches for ecological regeneration, management and conservation.KeywordsPit lakeRaniganj coalfield (RCF)Water quality indexGIS
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