Summary of Abstract Submission

Abstract Submission No. IO50-03-0044PresentationPoster

SHORT-TERM TO DECADE-SCALE SPITS EVOLUTION - AN INDICATOR OF THE RIVER AND SHORE DRIFT EVOLUTION IN GOA, INDIA

Bazile Pinel*1, Pravin D. Kunte2

1 University of Caen Basse-Normandie, , France
2 CSIR- National Institute of Oceanography, India

ABSTRACT :

Goa, the ¿Tourist Paradise of India¿, is disturbed in the recent times due to the sudden of real estate sector and the inconsistent tourist flows, with a consequent impact on coastal ecosystems. The aim of this study is a better grasp of the river mouths sand spits and their modification and evolution by seeking to determine what factors influence it. The assessment of the sand spits in decade-scale is also a good indicator of the modifications of shore and river drift. Sand spits situated at river-mouths are the major coastal geomorphologic indicators to know where and when the shore line changes occurred. Four sand spits were chosen because of their sizes and their shifts. A remote sensing approach was used to compare the morphologic changes and changes were confirmed by fieldwork. The present assessment shows yearly cyclicity of the sand spits morphology influenced by the seasonal climate changes. Indeed, the changes of orientation and strength of the waves and wind impact the shore currents and sediment transports. Whereas, the heavy rainfall impacts the river drift. Hence, the river sand spits are fluctuating in relation with this variables. The other spits are quite stable on decade-scale except one particular, where a spectacular erosion was noticed and is attributed to anthropogenic activities. This study shows that the analysis of the evolution of spits provides information on the river and shore drift. It is interesting to study the spits for a greater time and spatial scales to appreciate the impact of the global warming and other anthropogenic impacts on the coastal environment.