Summary of Abstract Submission

Abstract Submission No. IO50-03-0029PresentationPoster


Busnur R. Manjunatha*1

1 Department of Marine Geology, Mangalore University, India


Increase of civilization, the nearshore environments such as estuaries, backwater, lagoons and marshes is being disturbed to a greater extent due to different anthropogenic activities and impacts. By keeping view developmental activities along Karnataka and Kerala coasts, the southern part of west coast of India five sediment cores have been collected, sub-samples at 1 cm and subject to sedimentological and geochemical analyses followed by isotope dating. About 100 and odd sub-samples were selected for particle size and geochemical analyses as per standard procedure. The main objectives of the study are to determine the effects of human activities, such as deforestation, environmental pollution on particle size and toxic elemental variations in sediments accumulating with respect to time. Sand fractions are the major fraction of sediments that ranges from minimum of 40 to maximum of as much as 99 percent. The general trend is that the sand contents generally increase from core bottom to the top with some exceptional increase suggesting pulses of increased sediment input from the land. This indicates increased sediment input due to erosion not only due to changes in the heavy rainfall pattern, but also deforestation including changes in landuse pattern. The decreased input of sand from rivers catchment to the study area causing problems not only to humans, but also to the marine life. This aguments coastal navigation problem along with the accumulation of contaminants. This has also implications on coastal fisheries and decrease of alluvium (sand) resource that is a principal raw material for building construction.