Modeling of coastal erosion and sediment deposition during the 2004 Indian Ocean tsunami in Lhok Nga, Sumatra, Indonesia

摘要: This study presents the results of numerical simulations 2004 Indian Ocean earthquake and tsunami in Bay Lhok Nga (northwestern coast Sumatra, Indonesia) integrating sediment erosion deposition. We investigate transport both by suspension bedload under different scenarii long breaking dispersive waves through a series experiments. The source model used Koshimura et al. (Coast Eng J 51:243–273, 2008) with 25-m dislocation better reproduces wave travel time, flow depth inundation area than other models tested. realistically pronounced coastal retreat northern part (retreat ranging between 50 150 m), where Paris (Geomorphology 104:59–72, 2009) estimated mean 80 m. There is also good agreement simulated (195,400 m2) field observations (203,200 m2). simulation may underestimate volume deposits (611,700 m3 vs. 500,000–1,000,000 (2009). fully observed thickness when considering suspension, even if dominates. Limitations are due to micro-scale topographic, anthropic features (which not always represented DEM) amount debris which influence dynamics transport.