Mechanism of Beach Deformation Elucidated by Bathymetry Survey and Beach Trench Survey on Miyazaki Coast

  • Ryota NomuraEmail author
  • Shinji Sato
  • Kenji Noguchi
Conference paper


Significant beach deformation is developed on Miyazaki Coast facing the Pacific Ocean. Around the jetties located at the river mouth of the Hitotsuse River, excessive sedimentation is observed on the north side while severe erosion is developed on the south side. A field survey was conducted on the northern beach in order to understand the mechanism of the coastal deformation. Three beach trenches, 1.5 m deep, 30 to 50 m in cross-shore length, were excavated at north, central and south locations. Sediment layers were investigated by precise inspection of the stratum. Sediment samples taken from each trench were vertically sliced by every 2.5 cm. Particle size and the magnetism were analyzed for every sliced sample. Thermo-luminescence and Optically-stimulated-luminescence capable of estimating the alongshore sediment movement processes were measured. From the results, combined with analysis of topography surveys, temporal and spatial progression of coastal erosion was examined together with the short-term erosion developed by a big event such as typhoon. The trend of topographic change differed at years when there was a big typhoon. Furthermore, the erosion process at Miyazaki coast was quantitatively investigated on the basis of the bathymetry survey data for about 30 years.


beach trench survey coastal erosion sediment size luminescence beach processes 


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  1. Gallagher E, Wadman D, McNinch J, Reniers A, Koktas M:A Conceptual Model for Spatial Grain Size Variability on the Surface of and within Beaches, Journal of Marine Science and Engineering, 4, no.2: 38 (2016)CrossRefGoogle Scholar
  2. Higashi R, Sato S:A field study on sediment transport round the jetty of Hitotsuse river mouth, Journal of JSCE, Ser.B2 (Coastal Engineering), Vol.72, No.2, pp.685-690 (2016) (In Japanese)CrossRefGoogle Scholar
  3. Noguchi K:A study on sand-gravel beach formation and efficient nourishment based on beach trench survey and laboratory experiments, Dr. Eng. Dissertation, The University of Tokyo (2018) (In Japanese)Google Scholar
  4. Sato S, Kishimoto S, Hiramatsu H:Sediment movement and long-term deformation of sand and gravel beaches in Hyuganada sediment cell, Journal of JSCE, Ser.B2 (Coastal Engineering), Vol.B2-65, No.1, pp.671-675 (2009) (In Japanese)CrossRefGoogle Scholar
  5. Takano Y, Sato S:Study on early detection of disappearance of longshore bar accelerating coastal erosion, Journal of JSCE, Ser.B2 (Coastal Engineering), Vol.72, No.2, pp.703-708 (2016) (In Japanese)CrossRefGoogle Scholar

Copyright information

© Springer Nature Singapore Pte Ltd. 2020

Authors and Affiliations

  1. 1.Department of Civil EngineeringThe University of TokyoTokyoJapan

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