Fumihiko Yamada, Nobuhisa Kobayashi, Yuichiro Shirakawa, Yoshihiro Sakanishi


Fine-grained sediment budgets based on the monthly bed level and net sediment flux monitoring during October 2006 to October 2007 are estimated to examine the relative significance of tides and river discharges on mud transport on an intertidal flat adjacent to a river mouth in the semi-closed sound. The intertidal flat accreted during normal discharge conditions mainly due to the alongshore sediment flux toward the river mouth. However, the flat eroded during large discharge conditions at the time of low tides. The offshore sediment transport during the large discharge was four times larger than that during the normal discharge. The spatial variations of tidal currents cause alongshore sediment fluxes toward the river mouth on the intertidal flat adjacent to the river mouth. The proposed fine-grained sediment budgets are useful to understand and assess the transport pathways for silt and clay on the intertidal flat.


sediment budget; fine-grained sediment; tidal flat; flux monitoring

Full Text:



Andersen, T. J., Pejrup, M., and Nielsen, A. A. (2006). "Long-term and high-resolution measurements of bed level changes in a temperate, microtidal coastal lagoon." Mar. Geol., 226(1-2), 115-125.

Dyer, K. R., Christie, M. C., and Wright, E. W. (2000). "The classification of intertidal mudflat." Cont. Shelf Res., 20(10-11), 1039-1060.

Friedrichs, C. T., and Wright, L. D. (2004). "Gravity-driven sediment transport on the continental shelf: implications for equilibrium profiles near river mouths." Coastal Eng., 51(8-9), 795-811.

Green, M. and Coco, G. (2007). "Sediment transport on an estuarine intertidal flat: measurements and conceptual model of waves, rainfall and exchanges with a tidal creek." Estuarine, Coastal and Shelf Sci., 72(4), 553-569.

Giardino, A., Ibrahim, E., Adam, S., Toorman, E. A., and Monbaliu, J. (2009). "Hydrodynamics and cohesive sediment transport in the Ijzer estuary, Belgium: case study." J. of Waterw., Port, Coastal and Ocean Eng., 135(4), 176-184.

Harris, K. C., Sherwood, C. R., Signell, R. P., Bever, A. J., and Warner, J. C. (2008). "Sediment dispersal in the northwestern Adriatic Sea." J. of Geophys. Res., 113, C11S03, doi:10.1029/2006JC003868.

Kuriyama, Y. and Hashimoto, K. (2004). "Sediment budget on an intertidal flat at the mouth of the Shirakawa River, Japan." Technical Note of Port and Airport Research Institute, Yokosuka, Japan, 1074, 1-16.

Le Hir, P., Roberts, W., Cazaillet, O., Christie, M, Bassoullet, P., and Bacher, C. (2000). "Characterization of intertidal flat hydrodynamics." Cont. Shelf Res., 20(12-13), 1433-1459.

Malvarez, G., Navas, F., and Jackson, D. W. T. (2004). "Investigations on the morphodynamics of sandy tidal flats: a modeling application." Coastal Eng., 51(8-9), 731-747.

Parks, A. B., Shay, L. K., Johns, W. E., Martinez-Pedraja, J., and Gurgel, K. W. (2009). "HF radar observations of small-scale surface current variability in the Straits of Florida." J. of Geophys. Res., 114, C08002, doi:10.1029/2008JC005025.

Patchineelam, S. M., Kjerfve, B., and Gardner, L. R. (1999). "A preliminary sediment budget for the Winyah Bay estuary, South Carolina, USA." Mar. Geol., 162(1), 133-144.

Pedersen, J. B. T., and Bartholdy, J. (2006). "Budgets for fine-grained sediment in the Danish Wadden Sea." Mar. Geol., 235(1-4), 101–117.

Rodriguez, E. Z. and Dean, R. G. (2009). "A sediment budget analysis and management strategy for Fort Pierce Inlet, Florida." J. of Coastal Res., 25(4), 870-883.

Yamada, F. and Kobayashi, N. (2004). "Annual variations of tide level and mudflat profile." J. of Waterw., Port, Coastal and Ocean Eng., 130(3), 119-126.

Yamada F., Kobayashi, N., Sakanishi, Y. and Tamaki, A. (2009a). "Phase averaged suspended sediment fluxes on intertidal mudflat adjacent to river mouth." J. of Coastal Res., 25(2), 350-358.

Yamada F., Kobayashi, N., Sakanishi, Y., Shirakawa, Y., and Payo, A. (2009b). "Suspended sediment fluxes due to tides and waves on meso-tidal flat." Proc. of 31st International Conference on Coastal Eng., World Scientific, Singapore, 1990-2002.

Wheatcroft, R. A. (2000). "Oceanic flood sedimentation: a new perspective." Cont. Shelf Res., 20(16), 2059-2066.