The Effects of Sea Level Fall on the Caspian Sea Shoreline Changes

Authors

1 Faculty of Civil Engineering, Shahrood University of Technology

2 Department of Civil Engineering, Faculty of Engineering, University of Guilan

Abstract

The Caspian Sea level has experienced frequent fluctuations resulting in shoreline advance and retreat. Therefore, studying and predicting shoreline changes in the Caspian Sea are very important. The "Bruun Rule" was presented in order to predict shoreline variation due to sea level rise. In addition, to improve the predictions of the Bruun rule, added landward sediment transport to it, leading to more desirable results. In this research, the Bruun rule and its modified form, extended for landward transport, were investigated for the Caspian Sea level fall conditions. The modified equation in this study leads to the better results, which indicates that due to sea level fall and natural storms, there would be sediment deposition toward the shoreline. In terms of water level reduction, by applying the coefficient, the root mean squared error was obtained 3.447 meters for predicting shoreline changes in comparison to its natural changes. According to the results, the lowest difference in prediction is related to the Mahmudabad coast and the highest difference in prediction is related to the Dastak coast, which are equal to 0.059 and 4.849 meters, respectively. Based on this trend for forecasting shoreline changes by applying the coefficient and not having much difference in calculating the root mean square error based on the proposed equation of Rosati et al., it is possible to use the optimized equation in this study as a prediction of shoreline changes in terms of sea level fall; This coefficient has improved the forecasting trend of coastline changes in terms of water level reduction for each of the studied areas with direct deviations of D50 and HB in the equation, and the results obtained from forecasting shoreline variations show a lower difference for each area.

Keywords


  1. Bruun, P., (1954), Coast erosion and the development of beach profiles, U.S. Army Corps of Engineers, Beach Erosion Board, Tech. Memo. No. 44.
  2. Bruun, P., (1954), Coast erosion and the development of beach profiles, U.S. Army Corps of Engineers, Beach Erosion Board, Tech. Memo. No. 44.
  3. Bruun, P., (1962), Sea-level rise as a cause of shore erosion. Journal of the Waterways and Harbors division, 88(1), 117-132.
  4. Bruun, P., (1962), Sea-level rise as a cause of shore erosion. Journal of the Waterways and Harbors division, 88(1), 117-132.
  5. Rosati, J.D.; Dean, R.G., and Walton, T.L., (2013), The modified Bruun Rule extended for landward transport. Marine Geology, 340, 71-81. [DOI:10.1016/j.margeo.2013.04.018]
  6. Rosati, J.D.; Dean, R.G., and Walton, T.L., (2013), The modified Bruun Rule extended for landward transport. Marine Geology, 340, 71-81. [DOI:10.1016/j.margeo.2013.04.018]
  7. Sorensen, R.M., (2006), Basic coastal engineering, Third Edition (Vol. 10). Springer Science & Business Media, Printed in the United States of America.
  8. Sorensen, R.M., (2006), Basic coastal engineering, Third Edition (Vol. 10). Springer Science & Business Media, Printed in the United States of America.
  9. de Winter, R.C., and Ruessink, B.G., (2017), Sensitivity analysis of climate change impacts on dune erosion: case study for the Dutch Holland coast. Climatic Change, 141(4), 685-701. [DOI:10.1007/s10584-017-1922-3]
  10. de Winter, R.C., and Ruessink, B.G., (2017), Sensitivity analysis of climate change impacts on dune erosion: case study for the Dutch Holland coast. Climatic Change, 141(4), 685-701. [DOI:10.1007/s10584-017-1922-3]
  11. Vitousek, S.; Barnard, P.L.; Limber, P.; Erikson, L., and Cole, B., (2017), A model integrating longshore and cross‐shore processes for predicting long‐term shoreline response to climate change. Journal of Geophysical Research: Earth Surface.
  12. Vitousek, S.; Barnard, P.L.; Limber, P.; Erikson, L., and Cole, B., (2017), A model integrating longshore and cross‐shore processes for predicting long‐term shoreline response to climate change. Journal of Geophysical Research: Earth Surface.
  13. PMO report, (2016), Caspian Sea Level Changes. Ministry of Roads & Urban development of I.R. Iran. http://www.pmo.ir/en/home.
  14. PMO report, (2016), Caspian Sea Level Changes. Ministry of Roads & Urban development of I.R. Iran. http://www.pmo.ir/en/home.
  15. Neshaei, M.A.L.; Veiskarami, M., and Nadimy, S., (2011), Computation of shoreline change: A transient cross-shore sediment transport approach. International Journal of Physical Sciences, 6(24), 5822-5830.
  16. Neshaei, M.A.L.; Veiskarami, M., and Nadimy, S., (2011), Computation of shoreline change: A transient cross-shore sediment transport approach. International Journal of Physical Sciences, 6(24), 5822-5830.
  17. Firoozfar, A., Bromhead, E. N., Dykes, A. P., & Neshaei, M. A. L. (2012), Southern Caspian Sea coasts, morphology, sediment characteristics, and sea level change. In Proceedings of the Annual International Conference on Soils, Sediments, Water and Energy (Vol. 17, No. 1, p. 12).
  18. Firoozfar, A., Bromhead, E. N., Dykes, A. P., & Neshaei, M. A. L. (2012), Southern Caspian Sea coasts, morphology, sediment characteristics, and sea level change. In Proceedings of the Annual International Conference on Soils, Sediments, Water and Energy (Vol. 17, No. 1, p. 12).
  19. Schwartz, M.L., (1967), The Bruun theory of sea-level rise as a cause of shore erosion. The journal of Geology, 76-92. [DOI:10.1086/627232]
  20. Schwartz, M.L., (1967), The Bruun theory of sea-level rise as a cause of shore erosion. The journal of Geology, 76-92. [DOI:10.1086/627232]
  21. Schwartz, M.L., (1987), Editorial: The Bruun Rule. Twenty Years Later. Journal of Coastal Research, ii-iv.
  22. Schwartz, M.L., (1987), Editorial: The Bruun Rule. Twenty Years Later. Journal of Coastal Research, ii-iv.
  23. Williams, P.J., (1978), Laboratory development of a predictive relationship for washover volume on barrier island coastlines. Master thesis, Department of Civil Engineering, University of Delaware, Network, DE, 154p.
  24. Williams, P.J., (1978), Laboratory development of a predictive relationship for washover volume on barrier island coastlines. Master thesis, Department of Civil Engineering, University of Delaware, Network, DE, 154p.
  25. Park, Y.H., (2009), Overwash induced by storm conditions. Doctoral dissertation.
  26. Park, Y.H., (2009), Overwash induced by storm conditions. Doctoral dissertation.
  27. Kobayashi, N.; Tega, Y., and Hancock, M.W., (1996), Wave reflection and overwash of dunes. Journal of Waterway, Port, Coastal, and Ocean Engineering, 122(3), 150-153. [DOI:10.1061/(ASCE)0733-950X(1996)122:3(150)]
  28. Kobayashi, N.; Tega, Y., and Hancock, M.W., (1996), Wave reflection and overwash of dunes. Journal of Waterway, Port, Coastal, and Ocean Engineering, 122(3), 150-153. [DOI:10.1061/(ASCE)0733-950X(1996)122:3(150)]
  29. Tega, Y., and Kobayashi, N., (2000), Dune profile evolution due to overwash. Coastal Engineering, 2000. 2634-2647.
  30. Tega, Y., and Kobayashi, N., (2000), Dune profile evolution due to overwash. Coastal Engineering, 2000. 2634-2647.
  31. Davidson-Arnott, R.G., (2005), Conceptual model of the effects of sea level rise on sandy coasts. Journal of Coastal Research, 1166-1172. [DOI:10.2112/03-0051.1]
  32. Davidson-Arnott, R.G., (2005), Conceptual model of the effects of sea level rise on sandy coasts. Journal of Coastal Research, 1166-1172. [DOI:10.2112/03-0051.1]
  33. Donnelly, C.; Kraus, N., and Larson, M., (2006), State of knowledge on measurement and modeling of coastal overwash. Journal of Coastal Research, 965-991. [DOI:10.2112/04-0431.1]
  34. Donnelly, C.; Kraus, N., and Larson, M., (2006), State of knowledge on measurement and modeling of coastal overwash. Journal of Coastal Research, 965-991. [DOI:10.2112/04-0431.1]
  35. Donnelly, C., (2007), Morphologic change by overwash: establishing and evaluating predictors. Journal of Coastal Research, (SI 50 (special issue)), 520-526.
  36. Donnelly, C., (2007), Morphologic change by overwash: establishing and evaluating predictors. Journal of Coastal Research, (SI 50 (special issue)), 520-526.
  37. Donnelly, C., (2008), Coastal overwash: processes and modeling. Report LUTVDG/(TVVR-1043).
  38. Donnelly, C., (2008), Coastal overwash: processes and modeling. Report LUTVDG/(TVVR-1043).
  39. Larson, M.; Donnelly, C.; Jimenez, J., and Hanson, H., (2009), Analytical model of beach erosion and overwash during storms. Proceedings of the ICE-Maritime Engineering, 162(3), 115-125. [DOI:10.1680/maen.2009.162.3.115]
  40. Larson, M.; Donnelly, C.; Jimenez, J., and Hanson, H., (2009), Analytical model of beach erosion and overwash during storms. Proceedings of the ICE-Maritime Engineering, 162(3), 115-125. [DOI:10.1680/maen.2009.162.3.115]
  41. Aagaard, T., and Sorensen, P., (2013), Sea level rise and the sediment budget of an eroding barrier on the Danish North Sea coast. Journal of Coastal Research, 65(sp1), 434-439. [DOI:10.2112/SI65-074.1]
  42. Aagaard, T., and Sorensen, P., (2013), Sea level rise and the sediment budget of an eroding barrier on the Danish North Sea coast. Journal of Coastal Research, 65(sp1), 434-439. [DOI:10.2112/SI65-074.1]
  43. Houston, J.R., and Dean, R.G., (2014), Shoreline change on the east coast of Florida. Journal of Coastal Research, 30(4), 647-660. [DOI:10.2112/JCOASTRES-D-14-00028.1]
  44. Houston, J.R., and Dean, R.G., (2014), Shoreline change on the east coast of Florida. Journal of Coastal Research, 30(4), 647-660. [DOI:10.2112/JCOASTRES-D-14-00028.1]
  45. Tarigan, A.P.M., and Nurzanah, W., (2016), The Shoreline Retreat and Spatial Analysis over the Coastal Water of Belawan, INSIST, 1(1), 65-69. [DOI:10.23960/ins.v1i1.22]
  46. Tarigan, A.P.M., and Nurzanah, W., (2016), The Shoreline Retreat and Spatial Analysis over the Coastal Water of Belawan, INSIST, 1(1), 65-69. [DOI:10.23960/ins.v1i1.22]
  47. Cooper, J.A.G., and Pilkey, O.H., (2004), Sea-level rise and shoreline retreat: time to abandon the Bruun Rule. Global and planetary change, 43(3), 157-171. [DOI:10.1016/j.gloplacha.2004.07.001]
  48. Cooper, J.A.G., and Pilkey, O.H., (2004), Sea-level rise and shoreline retreat: time to abandon the Bruun Rule. Global and planetary change, 43(3), 157-171. [DOI:10.1016/j.gloplacha.2004.07.001]
  49. Kaplin, P.A., and Selivanov, A.O., (1995), Recent coastal evolution of the Caspian Sea as a natural model for coastal responses to the possible acceleration of global sea-level rise. Marine Geology, 124(1), 161-175. [DOI:10.1016/0025-3227(95)00038-Z]
  50. Kaplin, P.A., and Selivanov, A.O., (1995), Recent coastal evolution of the Caspian Sea as a natural model for coastal responses to the possible acceleration of global sea-level rise. Marine Geology, 124(1), 161-175. [DOI:10.1016/0025-3227(95)00038-Z]
  51. Leatherman, S.P.; Zhang, K., and Douglas, B.C., (2000), Sea level rise shown to drive coastal erosion. Eos, Transactions American Geophysical :union:, 81(6), 55-57. [DOI:10.1029/00EO00034]
  52. Leatherman, S.P.; Zhang, K., and Douglas, B.C., (2000), Sea level rise shown to drive coastal erosion. Eos, Transactions American Geophysical :union:, 81(6), 55-57. [DOI:10.1029/00EO00034]
  53. Zhang, K.; Douglas, B.C., and Leatherman, S.P., (2004), Global warming and coastal erosion. Climatic Change, 64(1-2), 41-58. [DOI:10.1023/B:CLIM.0000024690.32682.48]
  54. Zhang, K.; Douglas, B.C., and Leatherman, S.P., (2004), Global warming and coastal erosion. Climatic Change, 64(1-2), 41-58. [DOI:10.1023/B:CLIM.0000024690.32682.48]
  55. Ranasinghe, R.; Callaghan, D., and Stive, M.J., (2012), Estimating coastal recession due to sea level rise: beyond the Bruun rule. Climatic Change, 110(3-4), 561-574. [DOI:10.1007/s10584-011-0107-8]
  56. Ranasinghe, R.; Callaghan, D., and Stive, M.J., (2012), Estimating coastal recession due to sea level rise: beyond the Bruun rule. Climatic Change, 110(3-4), 561-574. [DOI:10.1007/s10584-011-0107-8]
  57. Coastal Engineering Research Center, (2006), Coastal engineering manual. United States, Army., U.S. Government Printing Office, Washington DC 20314-1000.
  58. Coastal Engineering Research Center, (2006), Coastal engineering manual. United States, Army., U.S. Government Printing Office, Washington DC 20314-1000.
  59. Baldock, T.E., and Holmes, P., (1999), Simulation and prediction of swash oscillations on a steep beach. Coastal Engineering, 36(3), 219-242. [DOI:10.1016/S0378-3839(99)00011-3]
  60. Baldock, T.E., and Holmes, P., (1999), Simulation and prediction of swash oscillations on a steep beach. Coastal Engineering, 36(3), 219-242. [DOI:10.1016/S0378-3839(99)00011-3]
  61. Svendsen, I.A.; Madsen, P.A., and Hansen, J.B., (1978), Wave characteristics in the surf zone. Coastal Engineering Proceedings, 1(16).
  62. Svendsen, I.A.; Madsen, P.A., and Hansen, J.B., (1978), Wave characteristics in the surf zone. Coastal Engineering Proceedings, 1(16).
  63. Yeh, H.H.; Ghazali, A., and Marton, I., (1989), Experimental study of bore run-up. Journal of Fluid Mechanics, 206, pp.563-578. [DOI:10.1017/S0022112089002417]
  64. Yeh, H.H.; Ghazali, A., and Marton, I., (1989), Experimental study of bore run-up. Journal of Fluid Mechanics, 206, pp.563-578. [DOI:10.1017/S0022112089002417]
  65. Caspian Sea National Research Center report, (2016), Caspian Sea Profiles. Water Research Institute, Ministry of Energy of I.R. Iran. http://wri.ac.ir/csnrc.
  66. Caspian Sea National Research Center report, (2016), Caspian Sea Profiles. Water Research Institute, Ministry of Energy of I.R. Iran. http://wri.ac.ir/csnrc.
  67. PMO, (2009), Waves modeling of Iranian seas; first volume: Caspian Sea. (In Persian).
  68. PMO, (2009), Waves modeling of Iranian seas; first volume: Caspian Sea. (In Persian).
  69. Willmott, C.J., and Matsuura, K., (2005), Advantages of the mean absolute error (MAE) over the root mean square error (RMSE) in assessing average model performance. Climate research, 30(1), 79. [DOI:10.3354/cr030079]
  70. Willmott, C.J., and Matsuura, K., (2005), Advantages of the mean absolute error (MAE) over the root mean square error (RMSE) in assessing average model performance. Climate research, 30(1), 79. [DOI:10.3354/cr030079]
  71. Sunamura, T., and Horikawa, K., (1975), Two dimensional beach transformation due to waves. Coastal Engineering, (pp. 920-938).
  72. Sunamura, T., and Horikawa, K., (1975), Two dimensional beach transformation due to waves. Coastal Engineering, (pp. 920-938).
  73. Aagaard, T., (2014), Sediment supply to beaches: cross‐shore sand transport on the lower shoreface. Journal of Geophysical Research: Earth Surface, 119(4), 913-926. [DOI:10.1002/2013JF003041]
  74. Aagaard, T., (2014), Sediment supply to beaches: cross‐shore sand transport on the lower shoreface. Journal of Geophysical Research: Earth Surface, 119(4), 913-926. [DOI:10.1002/2013JF003041]
  75. Nordstrom, K.F., (1977), The use of grain size statistics to distinguish between high-and moderate-energy beach environments. Journal of Sedimentary Research, 47(3).
  76. Nordstrom, K.F., (1977), The use of grain size statistics to distinguish between high-and moderate-energy beach environments. Journal of Sedimentary Research, 47(3).
  77. Aagaard, T., and Sorensen, P., (2012), Coastal profile response to sea level rise: a process‐based approach. Earth Surface Processes and Landforms, 37(3), 354-362. [DOI:10.1002/esp.2271]
  78. Aagaard, T., and Sorensen, P., (2012), Coastal profile response to sea level rise: a process‐based approach. Earth Surface Processes and Landforms, 37(3), 354-362. [DOI:10.1002/esp.2271]