FIELD EXPERIMENT ON BEACH NOURISHMENT USING GRAVEL AT JINKOJI COAST

Takayuki Kumada, Takaaki Uda, Takeo Matsu-ura, Michio Sumiya

Abstract


Beach nourishment using 87,000 m3 of gravel with grain size between 2.5 and 13 mm was experimentally carried out until April 2008 at the Jinkoji coast, which faces the Pacific Ocean and is surrounded by artificial headlands. Monitoring surveys, a boring test and core sampling on the beach were carried out to investigate the mechanism of the formation of gravel layers and their effect on protecting the foot of the seawall. It was found that the nourishment gravel was deposited with a slope of 1/8 at the foot of the seawall, thus providing some protection to the seawall, and that the nourishment gravel was stably deposited without offshore discharge.

Keywords


beach nourishment; gravel; artificial headland; monitoring survey; change in grain size

References


Komar, P. D. 2007. The design of stable and aesthetic beach fills: Learning from Nature, Coastal Sediments 07, 420-433.http://dx.doi.org/10.1061/40926(239)32

Kumada, T., T. Uda, M. Serizawa, H. Ishii, T. Nakamura and Y. Oki. 2007. Numerical simulation and field experiment on beach nourishment using coarse materials, Asian and Pacific Coasts 2007, Proc. 4 th Inter. Conf., 1094-1105.

Matsu-ura, T., T. Uda, T. Kumada and H. Nagayama. 2008. Evaluation of stabilization effect by artificial headlands built on Kashimanada coast using model for predicting changes in contour lines and grain sizes, Proc. 31 st ICCE, 1888-1900.


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