Abstract
Erosion and deposition by the 2011 Tohoku-oki tsunami in the coastal areas of the Sendai Plain were numerically investigated using the tsunami sediment transport model (STM). The simulation suggested that much of the sediment deposited on land originated from the beach and dune, whereas the contribution from sea-bottom sediments was quite minor. Erosion observed at the backs of engineering structures such as reinforced concrete (RC) dikes was reproduced well in the simulation. Simulated deposition and erosion inside the nearby coastal forest and farmlands were generally consistent with the observed data. Further investigation of the model parameters and implementation of dynamic change in the roughness coefficient and destruction of the structures are required to simulate detailed local variability of erosion and deposition and of the thin sand layer in the inland areas.
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Acknowledgments
We acknowledge the Tohoku Regional Bureau, Ministry of Land, Infrastructure and Transport, for providing the post-tsunami digital elevation model of the study area. We wish to thank Mr. Shunji Iwama, for his efforts in making the land use map. The research was financially supported by and carried out as a part of the Strategic Program for High-Performance Computing Infrastructure sponsored by the Ministry of Education, Culture, Sports, Science and Technology in Japan.
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Sugawara, D., Takahashi, T. (2014). Numerical Simulation of Coastal Sediment Transport by the 2011 Tohoku-Oki Earthquake Tsunami. In: Kontar, Y., Santiago-Fandiño, V., Takahashi, T. (eds) Tsunami Events and Lessons Learned. Advances in Natural and Technological Hazards Research, vol 35. Springer, Dordrecht. https://doi.org/10.1007/978-94-007-7269-4_4
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DOI: https://doi.org/10.1007/978-94-007-7269-4_4
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