Universal Journal of Geoscience Vol. 2(8), pp. 242 - 250
DOI: 10.13189/ujg.2014.020802
Reprint (PDF) (1284Kb)

GIS Based Tsunami Risk Assessment in Weligma, Sri Lanka

W.A.A.P Wijesundara *
National Aquatic Resources Research and Development Agency (NARA)


A tsunami is a natural coastal hazard generated in the deep ocean as a result of an earthquake, volcanic activity, submarine landslide or meteoritic impact. The 26th Dec. 2004 earthquake off the west coast of Sumatra, Indonesia generated one of the deadliest tsunami in history. It demolished the coastal areas of Indonesia, Sri Lanka, India, and Thailand, as these countries located shadow zone of this tectonic belt. Over thirty thousand loss their lives and also millions of worth extensive property damaged. As Sri Lanka situated in a shadow zone of the earthquake generated belt preparedness is very important factor. The study focused towards creation of a Tsunami risk map for Weligama area. The numerical simulation of tsunami inundation was carried out using ComMIT model with the major input parameters of earthquake source parameters, topography and bathymetry data. The December 2004 Sumatra Earthquake source parameters were used for generation, propagation, and coastal amplification of the tsunami waves and finally the inundation extent and water level was obtained to prepare large scale action maps on tsunami inundation to protect the coastal communities. The GIS tool has been used to incorporate the tsunami inundation depth to prepare the final tsunami risk map. Reliability of model results was compared with the field data and a high resolution QuickBird images with pre and post tsunami. The results from this study will be useful for long – term planning in vulnerable coastal communities and providing early warnings to take precautions to reduce impacts of tsunami in future.

Tsunami Inundation, Numerical Simulation, Early Warning, Pre and Post Tsunami, Coastal Communities

Cite this paper
W.A.A.P Wijesundara . "GIS Based Tsunami Risk Assessment in Weligma, Sri Lanka." Universal Journal of Geoscience 2.8 (2014) 242 - 250. doi: 10.13189/ujg.2014.020802.