[Home ] [Archive]    
:: Main :: About :: Current Issue :: Archive :: Search :: Submit :: Contact ::
:: ::
Back to the articles list Back to browse issues page
Effect of New Structures at Headland of Crenulate-Shaped Bays on the Equilibrium Shape of Bays in Mokran Coasts
Mohammad Arian, Hassan Akbari , Seyed Mojtaba Hoseini Chavoshi
Tarbiat Modares University
Abstract:   (41 Views)
Construction of a new coastal structure changes the stable shape of the shoreline. This issue generally leads to sedimentation and erosion around adjacent structures due to changes in Littoral Sediment Transport (LST). This mechanism is considerably more complicated in crenulate-shaped bays than in straight shorelines. Therefore, special theories have been introduced for these bays. In addition to the above-mentioned difficulties, using two-dimensional long-term morphological models with considerable run times is not practical in most real cases. Instability and numerical errors may also be occurred due to the complicated forms of shorelines. The aim of this research is to introduce a proper morphological model for South-Eastern shorelines of Iran. Long term morphological simulation has been done for three important bays in the Mokran coasts using numerical and empirical models. The results show that these models are appropriate for understanding the behavior of crenulate-shaped bays. Their responses to natural changes like climate changes as well as human interventions can also be simulated properly.
Keywords: Shoreline changes, Crenulate-shaped bays, Long term morphological simulation, Mepbay, One-line models (COVE)
Full-Text [PDF 1074 kb]   (10 Downloads)    
Type of Study: Research | Subject: Coastal Engineering
Received: 2018/12/4 | Accepted: 2019/05/22
1. Barkwith, A., C. W. Thomas, P. W. Limber, M. A. Ellis, and A. B. Murray (2014a), Coastal vulnerability of a pinned, soft-cliff coastline-Part I: Assessing the natural sensitivity to wave climate, Earth Surf. Dyn., 2(1), 295-308. [DOI:10.5194/esurf-2-295-2014]
2. Barkwith, A., M. D. Hurst, C. W. Thomas, M. A. Ellis, P. L. Limber, and A. B. Murray (2014b), Coastal vulnerability of a pinned, soft-cliff coastline. II: Assessing the influence of sea walls on future morphology, Earth Surf. Dyn., 2(1), 233-242. [DOI:10.5194/esurf-2-233-2014]
3. Daly, C. J., C. Winter, and K. R. Bryan (2015), On the morphological development of embayed beaches, Geomorphology, 248, 252-263, [DOI:10.1016/j.geomorph.2015.07.040]
4. Daly, C. J., K. R. Bryan, and C. Winter (2014), Wave energy distribution and morphological development in and around the shadow zone of an embayed beach, Coastal Eng., 93, 40-54. [DOI:10.1016/j.coastaleng.2014.08.003]
5. Gonzalez, M., Medina, R., (2001), On the application of static equilibrium bay formations to natural and man-made beaches, Coast. Eng. 43 (3-4), 209-225. [DOI:10.1016/S0378-3839(01)00014-X]
6. Hsu, J.R.C., Silvester, R., Xia, Y.M., (1989), Generalities on static equilibrium bay, Coast.Eng. 12, 353-369. [DOI:10.1016/0378-3839(89)90012-4]
7. Hurst, M., & Barkwith, A. (2015), Exploring the sensitivities of crenulate bay shorelines to wave climates using a new vec tor-based one-line model, Journal of Geophysical Research: Earth Surface, 2586-2608. [DOI:10.1002/2015JF003704]
8. Kaergaard, K., and J. Fredsoe (2013a), A numerical shoreline model for shorelines with large curvature, Coastal Eng., 74, 19-32. [DOI:10.1016/j.coastaleng.2012.11.011]
9. Kaergaard, K., and J. Fredsoe (2013b), Numerical modeling of shoreline undulations. Part 1: Constant wave climate, Coastal Eng., 75, 64-76. [DOI:10.1016/j.coastaleng.2012.11.006]
10. Kaergaard, K., and J. Fredsoe (2013c), Numerical modeling of shoreline undulations. Part 2: Varying wave climate and comparison with observations, Coastal Eng., 75, 77-90. [DOI:10.1016/j.coastaleng.2012.11.003]
11. Krumbein, W.C., (1944), Shore processes and beach characteristics, Technical Memorandum, vol. 3. Beach Erosion Board, U.S. Army Corps of Engineers, p.47.
12. LeBlond, P. H. (1972), On the formation of spiral beaches, Coastal Eng. Proc., 1(13), 1331-1343. [DOI:10.1061/9780872620490.076]
13. Martino, E., Moreno, L., Kraus, N.C., (2003), Engineering guidance for the use of bayed beach formulations, Proc. Coastal Sediments'03. ASCE.
14. Moreno, L.J., Kraus, N.C., (1999), Equilibrium shape of headland-bay beaches for engineering design, Proc. Coastal Sediments '99, vol. 1. ASCE, p.860-875.
15. Pelnard-Considere, R. (1956), Essai de theorie de l'evolution des formes de rivage en plages de sable etde galets, in 4th Journees de l'Hydraulique, Les Energies de la Mer, vol. 3, p.289-298.
16. Rea, P. D., and C. C. Komar (1975), Computer simulation models of a hooked beach shoreline configuration, J. Sediment. Res., 45(4), 866-872. [DOI:10.1306/212F6E6A-2B24-11D7-8648000102C1865D]
17. Silvester, R., Hsu, J.R.C., (1997), Coastal stabilization, World Scientific, Singapore, p.578. [DOI:10.1142/3475]
18. Walton Jr., T.L., (1977), Equilibrium shores and coastal design, Proc. Coastal Sediments'77, ASCE, p. 1-16.
19. Yasso, W.E., (1965), Plan geometry of headland bay beaches. J. Geol. 73, 702-714 [DOI:10.1086/627111]
Send email to the article author

Add your comments about this article
Your username or Email:


XML     Print

Back to the articles list Back to browse issues page
International Journal of Coastal and Offshore Engineering International Journal of Coastal and Offshore Engineering
Persian site map - English site map - Created in 0.06 seconds with 32 queries by YEKTAWEB 3897