Summary of Abstract Submission

Abstract Submission No. IO50-03-0004PresentationPoster

COASTAL GEOMORPHOLOGY AND MORPHOLOGICAL CHANGES ALONG SOUTH MAHARASHTRA COAST

R. Gowthaman*1, Sheela Sharma2, V. Sanilkumar2, Anoop T.R2

1 Ocean Engineering,CSIR-National Institute of Oceanography, India
2 Ocean Engineering,CSIR-National Institute of Oceanography , India

ABSTRACT :

Coastal areas are facing serious threats from both manmade and natural disturbances. Coastal erosion, sea level variation and cyclone generated waves are the major factors that alter the coast. The present study was carried out to understand the coastal geomorphology and morphological changes along the south Maharashtra coast. Coastal geomorphology was studied using the Indian Remote Sensing Satellite (IRS)-RS Linear Imaging Self-Scanning (LISS)-III sensor imagery of 2011 and 2013. Along the Ganapatipule zone the spit increased by 0.163 kmē area and got accreted near Shastri River mouth (Figs. 1 & 2 and Table 1). Along the Vengurla zone, the spit decreased by 0.014 kmē due to change in the creek mouth (Fig. 3 and Table 2). Mineral deposits in Ratnagiri region are found over berms and sand dunes. The change in beach morphology during an annual cycle (May 2013 to April 2014) was studied through beach profiles at four select locations (Ganapatipule, Bhatye, Purnagad and Vengurla) of south the Maharashtra coast. The beaches, of Ganapatipule and Vengurla are enclosed by headland in the north and south ends. The beaches on an average are about 90-150 m wide with moderate to steep foreshore backed by narrow to wide backshore with well-developed vegetated sand dunes and beach rock formations. All the beaches were varying from extremely gentle to average slope and showed dissipative to intermediate nature except the Vengurla beach which showed slightly reflective nature. Low beach width was observed during the southwest (SW) monsoon period (June-September). Beach volume was maximum just before the SW