http://nopr.niscair.res.in/handle/123456789/4237 Search the Channel search http://nopr.niscair.res.in/simple-search http://nopr.niscair.res.in/handle/123456789/4252 Title: High resolution satellite geoids/gravity over the western Indian offshore for tectonics and hydrocarbon exploration <br/> <br/>Authors: Bhattacharyya, R.; Verma, P. K.; Majumdar, T. J. <br/> <br/>Abstract: The present study consists of various satellite geoid/gravity maps of the western Indian offshore region and correlated with known tectonic features such as Bombay High, Chagos – Laccadive ridge complex, Laxmi ridge. The satellite-derived gravity maps have been compared with those of ship-borne gravity for validation purpose. Spectral analyses of gravity data over the study area brings out various components of interest, which could be correlated with subsurface features. The interpreted results indicate a positive correlation between the known geological elements and gravity field. <br/> <br/>Page(s): 116-125 http://nopr.niscair.res.in/handle/123456789/4251 Title: <smarttagtype namespaceuri="urn:schemas-microsoft-com:office:smarttags" name="place" downloadurl="http://www.5iantlavalamp.com/"><smarttagtype namespaceuri="urn:schemas-microsoft-com:office:smarttags" name="country-region" downloadurl="http://www.5iantlavalamp.com/"> Heat flow variation from bottom simulating reflector in the Kerala-Konkan basin of the western continental margin of India </smarttagtype></smarttagtype> <br/> <br/>Authors: Shankar, Uma; Sain, Kalachand <br/> <br/>Abstract: <smarttagtype namespaceuri="urn:schemas-microsoft-com:office:smarttags" name="metricconverter"> The base of the gas-hydrate stability field, representing the bottom simulating reflector or BSR, is observed over a closely spaced grid of multichannel seismic data in the Kerala-Konkan (KK) basin of the western continental margin of India (WCMI). The data reveal that gas-hydrates occur in the KK basin at places where water depth exceeds 1500 m. The thickness of the gas-hydrate stability field, inferred from BSR on seismic data, ranges between 190 and 340 m. The geothermal gradient, estimated from BSR, ranges from 40 to 60°C/km. The corresponding heat flow values vary between 36 to 54 mW/m². The result shows a seaward increase in geothermal gradient in the KK basin and brings out relatively high heat flow to the north and low heat flow in the south of the study area. The high heat flow distribution is explained by the decrease of sediment thickness proximal to the ocean/continent boundary. </smarttagtype> <br/> <br/>Page(s): 110-115 http://nopr.niscair.res.in/handle/123456789/4250 Title: Seasonal variation of Zn, Cu and Pb in the estuarine stretch of West Bengal <br/> <br/>Authors: Chakraborty, R.; Zaman, S.; Mukhopadhyay, N.; Banerjee, K.; Mitra, A. <br/> <br/>Abstract: Zn, Cu and Pb levels in the aquatic phase and underlying surface sediment from three stations (viz. Shankarpur, Canning and Bali Islands) of the coastal zone of West Bengal during different seasons in 2002 were recorded. The order of the heavy metal level in the ambient media of the selected stations is Zn> Cu> Pb. Highest concentrations of heavy metals were recorded in the surface water during monsoon, the period characterized by lowest salinity and pH of the ambient aquatic phase. During premonsoon season all the dissolved heavy metals exhibited minimum values. The biologically available heavy metals from surface sediment of the selected stations showed highest values during premonsoon and lowest during monsoon. Significant negative correlations between the concentrations of dissolved heavy metals and biologically available heavy metals from surface sediments elucidates a sharp exchange of selected metals between the aquatic phase and sediment in the study area. <br/> <br/>Page(s): 104-109 http://nopr.niscair.res.in/handle/123456789/4249 Title: <smarttagtype namespaceuri="urn:schemas-microsoft-com:office:smarttags" name="place" downloadurl="http://www.5iantlavalamp.com/"> Occurrence and distribution of some enteric bacteria along the southern coast of Kerala </smarttagtype> <br/> <br/>Authors: Ouseph, P. P.; Prasanthan, V.; Abhilash, P. P.; Udayakumar, P. <br/> <br/>Abstract: Six major groups of enteric bacteria, viz, Faecal coliforms<i style="">, E. coli, Shigella </i>spp.,<i style=""> Salmonella </i>spp.,<i style=""> Vibrio parahaemolyticus </i>and <i style="">Vibrio cholerae</i> were screened for the present study. The overall percentage occurrence of enteric bacteria in water and sediment was maximum accounted for <i style="">Vibrio parahaemolyticus</i> (81.7%) and minimum for <i style="">Salmonella</i> spp. (9.6%) and moderate reported against <i style="">Vibrio cholerae </i>(60.6%). The distribution of enteric bacteria was more in the water sample than sediment except <i style="">Vibrio </i>spp. and the highest occurrence was found to be at Cochin transect, which is the most polluted transect due to enteric microbes. Relationship between the stations on the occurrence of enteric bacteria was linear and significant variations was observed (R²=0.899) and the same pattern of linear regression model was also obtained in source wise occurrence (R²=0.777). The present study elucidates that the health status of the Kerala coast may deteriorates and will be detrimental to the coastal community. <br/> <br/>Page(s): 97-103