Shoreline changes over last five decades and predictions for 2030 and 2040: a case study from Cuddalore, southeast coast of India
Résumé
We estimated shoreline changes over the last five decades in a part of the southeast coast of India at Cuddalore by usingmultitemporal satellite images from six different time-windows (i.e. 1972, 1980, 1990, 2000, 2010 and 2020) and the digitalshoreline analysis system tool (DSAS 5.0). The linear regression rate and end point rate quantified the maximum erosion atrates of 6.8–7.2 m/year and the maximum accretion at rates of 3.9–4.2 m/year at different sites along the 42 km stretch thatwas affected by several disasters in the recent past and has a substantial industrial presence. The net shoreline movementanalysis identified the sites that experienced about 340 m of erosion and about 203 m of accretion. The Kalman filter modelpredicted up to 274 m of the shoreline erosion at Chinna vaaikaal until 2040. Similarly, the shoreline at Puthupettai could beaccreted up to 538 m over the same interval. The outcome of this research demonstrates that studies similar to ours shouldbe carried out in different parts along the vast Indian coastline to understand the shoreline evolution in order to prepare abetter coastal management strategy.