FIELD OBSERVATION AND NUMERICAL SIMULATION OF BARRIER ISLAND FORMATION AS RESULT OF ELONGATION OF SAND SPIT AND ITS ATTACHMENT TO OPPOSITE SHORE

Shiho Miyahara; Takaaki Uda; Masumi Serizawa

doi:10.9753/icce.v35.sediment.5

Núm. 35 (2016), Sediment Transport and Morphology

Núm. 35 (2016)

FIELD OBSERVATION AND NUMERICAL SIMULATION OF BARRIER ISLAND FORMATION AS RESULT OF ELONGATION OF SAND SPIT AND ITS ATTACHMENT TO OPPOSITE SHORE

Sediment Transport and Morphology

Publicado 2017-06-23

Shiho Miyahara⁺⁻
Takaaki Uda⁺⁻
Masumi Serizawa⁺⁻

Shiho Miyahara

Coastal Engineering Laboratory Co., Ltd.

Takaaki Uda

Public Works Research Center

Masumi Serizawa

Coastal Engineering Laboratory Co., Ltd.

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Palabras clave

barrier island
Nakatsu tidal flat
BG model
aerial photographs
longshore sand transport

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FIELD OBSERVATION AND NUMERICAL SIMULATION OF BARRIER ISLAND FORMATION AS RESULT OF ELONGATION OF SAND SPIT AND ITS ATTACHMENT TO OPPOSITE SHORE. (2017). Coastal Engineering Proceedings, 1(35), sediment.5. https://doi.org/10.9753/icce.v35.sediment.5

Resumen

An artificial mound was produced from dredged materials containing sand and gravel in the Nakatsu tidal flat facing the Suo-nada Sea, and this artificial mound served as a supply source of sediment for the development of a barrier island. A sand spit extended from this mound in an extremely shallow sea and attached to the opposite shore, resulting in the formation of a barrier island. The planar changes in the sand spit were investigated using aerial photographs. Observations were compared with the results of a numerical simulation regarding the formation of a barrier island on a sloping bed with a 1/40 slope using the BG model (a model for predicting three-dimensional beach changes based on Bagnold's concept). The observed change in the barrier island and the calculated results were in good agreement.

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Referencias

Bird, E. 2001. Coastal Geomorphology, Wiley, 322 p.

Miyahara, S., T. Uda, M. Serizawa, and T. San-nami. 2015. Elongation of sand spit and profile changes

on sloping shallow seabed, 8th Int. Conf. on Asian and Pacific Coasts (APAC 2015), Procedia

Engineering, 116, 245-253.

Nummedal, D. 1983. Barrier Islands, in Handbook of Coastal Processes and Erosion, P. D. Komar

(ed.), 77†' 121, Boca Raton, FL: CRC Press.

San-nami, T., T. Uda, M. Serizawa, and S. Miyahara, S. 2014. Numerical simulation of elongation of

sand spit on seabed with different water depths and slopes, Proceedings of 34th International

Conference on Coastal Engineering, ASCE, 1-13.

Schwarz, M. L. 1971. The multiple causation of barrier islands, J. Geology, 79, 91-93.

Seino, S., T. Uda, Y. Ashikaga, Y. Kanda, and H. Jono, 2007. Mechanism of deformation of a sand bar in Sanbyakken area in Nakatsu tidal flat, Proc. Japan. Coastal Eng. Conf., 54, 566†'570. (in Japanese)

Uda, T., S. Seino, Y. Ashikaga, and H. Jono. 2008. Rapid deformation of sand spit triggered by storm surge in Sanbyakken area in Nakatsu tidal flat, Proc. Japan. Coastal Eng. Conf., JSCE, 55, 481- 485. (in Japanese)

Uda, T., and M. Serizawa. 2011. Model for predicting formation of bay barrier in flat shallow sea, Coastal Sediments '11, 1176-1189.

Uda, T., S. Onaka, and M. Serizawa. 2015. Beach erosion downcoast of Pengambengan fishing port in western part of Bali Island Japan, 8th Int. Conf. on Asian and Pacific Coasts (APAC 2015), Procedia Engineering, 116, 494-501.

Authors retain copyright and grant the Proceedings right of first publication with the work simultaneously licensed under a Creative Commons Attribution License that allows others to share the work with an acknowledgement of the work's authorship and initial publication in this Proceedings.

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FIELD OBSERVATION AND NUMERICAL SIMULATION OF BARRIER ISLAND FORMATION AS RESULT OF ELONGATION OF SAND SPIT AND ITS ATTACHMENT TO OPPOSITE SHORE

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