QUANTITATIVE PREDICTION OF SAND DISCHARGE INTO SUBMARINE CANYON OFF MORITO RIVER ON SEISHO COAST, JAPAN

Kou Furuike, Takaaki Uda, Masumi Serizawa, Toshiro San-nami, Toshinori Ishikawa

Abstract


On the Seisho coast, submarine canyons have developed very close to the shoreline and the discharge of fluvial sediment of the Sakawa River into the submarine canyons has been reported, resulting in the net loss of sand into the offshore zone. The beach topography under dynamically equilibrium conditions owing to the sediment supply from the river and the sand loss into the submarine canyons during several thousand years was reproduced using the contour-line-change model considering the grain size composition. Long-term beach changes around the submarine canyons were accurately predicted and the effect of beach nourishment using a mixture of fine and coarse materials was investigated.

Keywords


submarine canyon; beach changes; long-term prediction; contour-line-change model; Seisho coast

References


Kamphuis, J. W., M. H. Davies, R. B. Narim and O. J. Sayao. 1986. Calculation of littoral sand transport rate, Coastal Engineering, Vol. 10, 1-12.http://dx.doi.org/10.1016/0378-3839(86)90036-0

Kraus, N. C. 1985. Field experiments on vertical mixing of sand in the surf zone, J. Sedimentary Petrology, Vol. 55, 3-14.

Kumada, T., A. Kobayashi, T. Uda and M. Serizawa. 2003. Development of predictive model of shoreline and grain size changes, Coastal Sediments '03, 1-14.

Ozasa, H. and A. H. Brampton. 1980. Model for predicting the shoreline evolution of beaches backed by seawalls, Coastal Eng., Vol. 4, 47-64.http://dx.doi.org/10.1016/0378-3839(80)90005-8

Sakai, K., T. Uda, M. Serizawa, T. Kumada and Y. Kanda. 2006. Model for predicting threedimensional sea bottom topography of statically stable beach, Proc. 30th ICCE, 3184-3196.

Serizawa, M., T. Uda, T. San-nami, K. Furuike and T. Kumada. 2003. Improvement of contour line change model in terms of stabilization mechanism of longitudinal profile, Coastal Sediments '03, 1-15.

Uda, T. and S. Kawano. 1996. Development of a predictive model of contour line change due to waves, Proc. JSCE, No. 539/II-35, 121-139. (in Japanese)

Uda, T., T. Kumada and M. Serizawa. 2004. Predictive model of change in longitudinal profile in beach nourishment using sand of mixed grain size, Proc. 29th ICCE, 3378-3390.

Uda, T. and S. Yano. 1987. Beach erosion of Seisho coast facing Sagami Bay, Japan.


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