Print Email Facebook Twitter Factors responsible for the limited inland extent of sand deposits on Leyte Island during 2013 Typhoon Haiyan Title Factors responsible for the limited inland extent of sand deposits on Leyte Island during 2013 Typhoon Haiyan Author Watanabe, M. (Tohoku University) Bricker, J.D. (TU Delft Hydraulic Structures and Flood Risk; Tohoku University) Goto, K. (Tohoku University) Imamura, F. (Tohoku University) Date 2017 Abstract Previous geological studies suggest that the maximum inland extent of storm-induced sand deposits is shorter, but their thickness is larger, than those of tsunami-induced sand deposits. However, factors that determine the maximum extent and thickness of storm deposits are still uncertain. We conducted numerical simulations of storm surge, waves, and sediment transport during Typhoon Haiyan in order to understand the distribution and sedimentary processes responsible for storm deposits. Numerical results showed that wave-induced currents slightly offshore were strong, but attenuated rapidly in the inland direction after wave breaking. Therefore, sediments were not transported far inland by waves and storm surge. Consequently, the maximum inland extent of storm deposits was remarkably shorter than the inland extent of inundation. We also revealed that vegetation (roughness coefficient) and typhoon intensity greatly affect the calculation of maximum extent and thickness distribution of storm deposits. As the duration of wave impact on a coast is relatively long during a storm (hours, compared to minutes for a tsunami), sediments are repeatedly supplied by multiple waves. Therefore, storm deposits tend to be thicker than tsunami deposits, and multiple layers can form in the internal sedimentary structure of the deposits. We infer that limitation of the sand deposit to within only a short distance inland from the shoreline and multiple layers found in a deposit can be used as appropriate identification proxies for storm deposits. To reference this document use: http://resolver.tudelft.nl/uuid:4f75d4b6-2e53-43aa-8cce-52acdfe2682f DOI https://doi.org/10.1002/2016JC012023 Embargo date 2017-10-01 ISSN 2169-9275 Source Journal Of Geophysical Research-Oceans Bibliographical note Publisher's version/PDF must be used in Institutional Repository 6 months after publication Part of collection Institutional Repository Document type journal article Rights © 2017 M. Watanabe, J.D. Bricker, K. Goto, F. Imamura Files PDF Watanabe_et_al_2017_Journ ... Oceans.pdf 1.8 MB Close viewer /islandora/object/uuid:4f75d4b6-2e53-43aa-8cce-52acdfe2682f/datastream/OBJ/view