Grain-size characteristics of seafloor sediment and transport pattern in the Caspian Sea (Nowshahr and Babolsar coasts)


1 Faculty of Natural Resources and Marine Sciences, Tarbiat Modares University,

2 Department of Marine Physics, Faculty of Natural Resources and Marine Sciences, Tarbiat Modares University,

3 Department of Marine Physics, Faculty of Natural Resources and Marine Sciences, Tarbiat Modares University,


The aim of the current study is to determine the equilibrium beach profiles of the coasts of Babolsar and Nowshahr in the southern Caspian Sea. Using depth field data collected from two beaches in the period from 2018 to 2019, seasonal beach profiles and equilibrium beach profiles of the study area were extracted. To investigate the type and transfer of bed sediments, samples were collected from depths of 0.5, 1.5, 3 and 5 meters and were transferred to the laboratory for granulation. The results show the predominant type of sediments in Babolsar and Nowshahr are fine sand with an average of 82.39% and 82.12%, respectively. Also, the percentage of fine-grained sediments, including very fine sand and silt have increased from nearshore to offshore. In the west-east, the median diameter of sediment and the profile slope decreased, from there, the erosion and deposition rate in the two regions has changed. In the western regions, the diameter of beach sediments is more than in the eastern regions due to strong sea currents and relatively coarse-grained sediments from the rivers of western Mazandaran, as well as human activities.


  1. Dean, R. G. and Dalrymple, R. A., (2004), Coastal processes with engineering applications, Cambridge University Press, 489p.
  2. Pan, Y., Kuang, C., Zhang, J., Chen, Y., Mao, X., Ma, Y., Zhang, , Yang, Y., Qiu, R., (2017), Post nourishment evolution of beach profiles in a low-energy sandy beach with a submerged berm,Journal of Waterway, Port, Coastal, and Ocean Engineering, 143(4): 05017001.
  3. Wilson, K. C., (1966), Bed-load transport at high shear stress,Journal of the Hydraulics Division, 92(6): 49-59.
  4. Watanabe, A., (1982), Numerical models of nearshore currents and beach deformation,Coastal Engineering in Japan, 25(1): 147-161.
  5. Van Rijn, L. C., (1993), Principles of sediment transport in rivers, estuaries and coastal seas, Aqua Publications, Amsterdam,
  6. Ozkan-Haller, H. T., Brundidge, S., (2007), Equilibrium beach profile concept for Delaware beaches,Journal of Waterway, Port, Coastal, and Ocean Engineering, 133(2): 147-160.
  7. Lopez, I., Aragones, L., Villacampa, Y., (2016), Analysis and modelling of cross-shore profile of gravel beaches in the province of Alicante,Ocean Engineering, 118: 173-186.
  8. Bruun, P., (1954), Coast erosion and the development of beach profiles, US Beach Erosion Board.
  9. Dean, R. G., (1991), Equilibrium beach profiles: characteristics and applications,Journal of Coastal Research, 7(1): 53-84.
  10. Mangor, K., (2001), Shoreline Management Guidelines, DHI-Water and Environment, 232p.‏
  11. Aragones, L., Serra, J. C., Villacampa, Y., Saval, J. M., Tinoco, H., (2016), New methodology for describing the equilibrium beach profile applied to the Valencia's beaches,Geomorphology, 259: 1-11.
  12. Lopez, I., Aragones, L., Villacampa, Y., Navarro-Gonzalez, F. J., (2018), Gravel beaches nourishment: Modelling the equilibrium beach profile,Science of the Total Environment, 619: 772-783.
  13. Mansoury, D., Sadrinasab, M., (2013), Investigation of Bottom Sediment Distribution in Noor Marine Area, Fifth National Conference on Offshore Industries, Sharif University of Technology, Tehran.
  14. Roradeh, H., Lorestani, Q., Etemadi, F., Valikhani, S., (2013), Simulation of wave dynamics and sand transfer in the Caspian Sea coasts (Gorgan Bay), Quantitative geomorphological research, 2(2), p. 1-18.
  15. [15]     Khoshravan, H., Rohanizadeh, S., Malek, J., Nejadgholi, G., (2012),  Caspian Sea southern coasts zoning on the basis of sedimentary morphodynamical indicators, Earth and Space Physics, 37(3): 1-15.
  16. Boggs, S. r., (2005), Principles of sedimentology and stratigraphy, Prentice Hall: New Jersey.
  17. Ataei, S., Adjami, M., Lashteh Neshaei, M. A., Haghighifar, M., (2014), Classification of equilibrium beach profile in the Caspian Sea,International Geoinformatics Research and Development Journal, 6: 8-18.
  18. Voropaev, G. V., (1986), The Caspian Sea; hydrology and hydrochemistry, Moscow, Nauka, 262p.
  19. Lahijani, H., (1997), Riverine Sediments and stability of Iranian coast of the Caspian Sea, PhD Thesis, Russian Academy of Science, 120 p.
  20. Rychagov, G. I., (1997), Holocene oscillations of the Caspian Sea and forecasts based on paleogeographical reconstructions, Quaternary International, 41(42): 167-172.
  21. Leroy, S. A. G., Marret, F., Gibert, E., Chalié, F., Reyss, J. L., Arpe, K., (2007), River inflow and salinity changes in the Caspian Sea during the last 5500 years.Quaternary Science Reviews, 26(25-28): 3359-3383.
  22. Zereshkian, S., and Mansoury, D., 2020. Evaluation of ocean thermal energy for supplying the electric power of offshore oil and gas platforms, Journal of the Earth and Space Physics, Vol. 46, No. 2, 331-345.
  23. Frihy, O.E., Iskander, M.M., Badr, A.E. and Lotfy, M. F., (2004), Effects of shoreline and bedrock irregularities on the morphodynamics of the Alexandria coast littoral cell, Egypt, Geo-Mar Lett .24: 195–211 DOI 10.1007.
  24. Houston, J. R., (1995), Beach-fill volume required to produce specified dry beach width,Coastal Engineering Technical Note, 11-32.
  25. Blott, S. J., Pye, K., (2001), GRADISTAT: a grain size distribution and statistics package for the analysis of unconsolidated sediments,Earth Surface Processes and Landforms, 26(11): 1237-1248.