SEDIMENT TRANSPORT AND DISPERSAL IN THE NEARSHORE OF “FLASH-FLOOD” RIVERS.

Manel Grifoll, Vicenç Gracia, Jorge Guillén, Manuel Espino, Agustín Sanchez-Arcilla

Abstract


River sediment dispersal on the near-shore of “flash-flood” rivers is investigated using a coupled wave-current-sediment transport model. Besòs and Llobregat rivers (short and mountainous rivers in NW Mediterranean Sea, near to Barcelona City) are used as examples to study the sediment transport under “flash-flood” regime. The modeling system COWAST which includes the coupling between the water circulation model ROMS and the wave model SWAN, is applied to assess the sediment dispersal mechanisms and deposition in the coastal area off the two river mouths. Preferential depositional areas such as mud-belts were identified from the simulations. The sediment dispersal pattern obtained by the model agrees with observational measurments. Complementary numerical simulations revealed sorting of sediment grain size in the cross-shelf direction.

Keywords


sediment transport; river dispersal; mud-belt; coupling

Full Text:

PDF

References


Bever, A. J., C. K. Harris, C. R. Sherwood, and R. P. Signell. 2009. Deposition and flux of sediment from the Po River, Italy: An idealized and wintertime numerical modeling study, Mar. Geol., 260(1-4), 69–80, doi:10.1016/j.margeo.2009.01.007.

Bever, A. J., J. E. McNinch, and C. K. Harris. 2011. Hydrodynamics and sediment-transport in the nearshore of Poverty Bay, New Zealand: Observations of nearshore sediment segregation and oceanic storms, Cont. Shelf Res., 31(6), 507–526, doi:10.1016/j.csr.2010.12.007.

Galparsoro, I., A., Broja, I., Legorburu, C., Hernández, G., Chust, P., Liria, and A. Uriarte. 2010. Morphological characteristics of the Basque continental shelf (Bay of Biscay, northern Spain); their implications for Integrated Coastal Zone Managment. Geomorphologhy 118 (3-4), 314-329.

Grifoll, M., V. Gracia, Aretxabaleta, A., Guillèn, J., Espino, M. and J.C. Warner. 2014. Formation of fine sedimetn deposit from a flash-flood river in the Mediterranean Sea. J. Geophys. Res. Ocean., doi: 10.1002/2014JC010187

Grifoll, M., V. Gracia, J. Fernandez, and M. Espino. 2013a. Suspended sediment observations in the Barcelona inner-shelf during storms, In: Conley, D.C., Masselink, G., Russell, P.E. and O’Hare,T.J. (eds.), Proceedings 12th International Coastal Symposium (Plymouth, England), Journal of Coastal Research, Special Issue No. 65, pp. 1533-1538, ISSN 0749-0208.

Grifoll, M., A. L. Aretxabaleta, J. L. Pelegrí, M. Espino, J. C. Warner, and A. Sánchez-Arcilla. 2013b. Seasonal circulation over the Catalan inner-shelf (northwest Mediterranean Sea), J. Geophys. Res. Ocean., 118(10), 5844–5857, doi:10.1002/jgrc.20403.

Grifoll, M., A. L. Aretxabaleta, M. Espino, and J. C. Warner. 2012. Along-shelf current variability on the Catalan inner-shelf (NW Mediterranean), J. Geophys. Res., 117(C9), 1–14, doi:10.1029/2012JC008182.

Guillén, J., F. Bourrin, a. Palanques, X. Durrieu de Madron, P. Puig, and R. Buscail. 2006. Sediment dynamics during wet and dry storm events on the Têt inner shelf (SW Gulf of Lions), Mar. Geol., 234(1-4), 129–142, doi:10.1016/j.margeo.2006.09.018.

Guillén, J., and J. Jimenez. (2009). Comment on “Wave climate, sediment supply and the depth of the sand–mud transition: A global survey” by D.A. George and P.S. Hill [Marine Geology 254 (2008) 121–128]. Mar. Geol. 264, 251-261, doi: :10.1016/j.margeo.2009.04.004

Harris, C. K. and P. Wiberg. 2002. Across-shelf sediment transport: Interactions between suspended sediment and bed sediment, J. Geophys. Res., 107(C1),doi:10.1029/2000JC000634.

Harris, C. K., C. R. Sherwood, R. P. Signell, A. J. Bever, and J. C. Warner. 2008. Sediment dispersal in the northwestern Adriatic Sea, J. Geophys. Res., 113(C11), C11S03, doi:10.1029/2006JC003868.

Liquete, C., M. Canals, G. Lastras, D. Amblas, R. Urgeles, B. De Mol, M. De Batist, and J. E. Hughes-Clarke. 2007. Long-term development and current status of the Barcelona continental shelf: A source-to-sink approach, Cont. Shelf Res., 27(13), 1779–1800, doi:10.1016/j.csr.2007.02.007.

Sherwood, C. R., B. Butman, D. A. Cacchione, D. E. Drake, T. F. Gross, R. W. Sternberg, P. L. Wiberg, and A. J. Williams. 1994. Sediment-transport events on the northern California continental shelf during the 1990–1991 STRESS experiment, Cont. Shelf Res., 14(10-11), 1063–1099, doi:10.1016/0278-4343(94)90029-9.

Scandura, P. and E. Foti. 2011. Measurements of wave-induced steady currents outside the surf-zone. Journal of Hydraulic Research (49), 64-71.

Ulses, C., C. Estournel, X. Durrieu de Madron, and A. Palanques. 2008. Suspended sediment transport in the Gulf of Lions (NW Mediterranean): Impact of extreme storms and floods, Cont. Shelf Res., 28(15), 2048–2070, doi:10.1016/j.csr.2008.01.015.

Warner, J.C., Armstrong, B., He, R., Zambon, J. 2010. Development of a Coupled Ocean-Atmosphere-Wave-Sediment Transport (COAWST) Modeling System, Ocean Modelling, 35, 230-244.R.L. 1965. Oceanographical Engineering, Prentice-Hall, Englewood Cliffs, New Jersey, 531 pp.

Wright, L. D., and C. a. Nittrouer. 1995. Dispersal of River Sediments in Coastal Seas: Six Contrasting Cases, Estuaries, 18(3), 494, doi:10.2307/1352367.

Xu, K., C. K. Harris, R. D. Hetland, and J. M. Kaihatu. 2011. Dispersal of Mississippi and Atchafalaya sediment on the Texas–Louisiana shelf: Model estimates for the year 1993, Cont. Shelf Res., 31(15), 1558–1575, doi:10.1016/j.csr.2011.05.008.

Xue, Z., He, R., Liu, J.P. and J.C. Warner 2012. Modeling transport and deposition of the Mekong River sediment. Cont. Shelf Res., 37(1), 66-78. doi.org/10.1016 /j.csr.2012.02.010




DOI: https://doi.org/10.9753/icce.v34.sediment.51