Study on Impact of Sea Level Rise and Extreme Sea State on Coastal Inundation in Tamil Nadu

Hezron Philip, S Jayalakshmi
International Research Journal of Engineering and Technology (IRJET)   unpublished
The rapid increase in the rate of sea level rise over the recent years has become a cause for concern to the coastal communities as a whole; therefore, a comprehensive study on the effects of sea level rise and related phenomena that influence the inundation of the coastal areas of Tamil Nadu is undertaken. The inundation level for the year 2004 is estimated with consideration to the relative sea level rise, extreme wave height with a 100 year return period based on extreme probability
more » ... robability distribution of the significant wave height data and also taking into account the effect of tidal and meteorological forcing on the sea level. GIS based inundation mapping is done on the digital elevation model to determine the areas that are vulnerable to the flooding. This is compared with the observed values of inundation due to the tsunami during the year 2004 to validate the model. The model is used to map the inundation for the year 2100 and to assess the socioeconomic impacts, as well as the comparative impact on the land use land cover of Tamil Nadu with respect to a hypothetical scenario of extreme conditions during the year 2012. The Analysis of the affected land use gives us a clear picture as to the areas that are most affected by the projected inundation. The wetlands (86.27%) and the mangrove forests (96.86%) are the land uses that have a large percentage of area that is affected by the projected inundation. The districts worst affected by the projected inundation are Cuddalore, Nagapattinam and Rameswaram. This is due to the low elevation of these districts.