The Effect of Changes in Wave Height on Erosion Pattern and Sedimentation in Inlet

Subject Areas : Marine Physics

A. Karami Khaniki ¹ , M. S. Kiaee ²

1 - Dept. of Physical Oceanography, Islamic Azad University, Tehran Science and Research Branch
2 - Dept. of Physical Oceanography, Islamic Azad University, Tehran Science and Research Branch

Received: 2016-11-25 Accepted : 2017-09-09 Published : 2017-12-21

Keywords: Wave height, inlet, non cohesive sediment, Mike21,

Abstract :

Wave is one of the main factors forming inlets. Refraction of waves in shallow waters of inlet’s mouth forms bank flows and transports sediments in this area.  Wave height is one of the hydrodynamic parameters and its effect on flow and sedimentation patterns are examined.   In this study, for this purpose, a coastal basin that is connected to the open sea through a mouth is simulated in Mike 21 software. For this simulation, an unstructured flexible mesh, with the dimension of 10 to 50 meters was used, in a finite difference model. In this model, the waves with 0.75, 1.5 and 2.2 m heights and 8 sec. fixed period are emitted perpendicular to the coastline. Then, the amounts of flow and sediment transportation are calculated in different parts of the mouth according to simulation results. The flow rate increases as the wave height increases and proportionally the volume of transported sediment is also increased.

References:

کرمی خانیکی، ع.، سادات کیایی، م. و علی اکبری بیدختی، ع. 1390.  بررسی الگوی جریان و انتقال رسوب در مصب ها تحت اثر امواج عمود بر ساحل با استفاده از یک مدل عددی. سیزدهمین همایش صنایع دریایی بین المللی کیش، ایران.

 

   Fachin, S. & Sancho F. E. P. 2003. Morph dynamic instabilities in the surf zone. Journal of Geology and Mining Research, 105(C10): 24071- 24087. 

   Kennedy, A.B. & Kirby, J.T. 2003. An unsteady wave driver for narrow banded waves: modeling near shore circulation driven by wave groups. Coastal Engineering, 48: 257-27.

Kraus, N.C. 1992. Engineering approaches to cross-shore sediment   transport processes. Proceeding of the short Course on Design and Reliability of Coastal Structures, attached to 23^rd International Conference on Coastal Engineering, Venice, Italy.

   Milittello, A. 2003.  Numerical  simulation  ofsediment  pathways  at  an Idealized Inlet and  Ebb shoal, Proceedings coastal sediments 03, 2003.CD  ROM  by published  by  World scientific  publishing  crop and  East Meets  west  Productions. Croups Cristi. Texas, USA.

Van Leeuwen, S.M. & De Swart, H.E. 2002. Intermediate modeling of tidal inlet systems: spatial asymmetries in flow and mean sediment transport. Continental Shelf Research, 22:1795–1810.

    Seaberg, W. C., king, D. B. & Stephens, B. E. 2001. Tidal Inlet Equilibrium Area Experiments. Inlet Laboratory Investigations Coastal and Hydraulics Laboratory, ERDC/CHL.TR-01-20.