An investigation into the effects of tidal barrier operation on the tidal asymmetry in the Arvand Estuary

Document Type : Research Paper


1 Department of Civil Engineering, K. N. Toosi University of Technology, Tehran, Iran.

2 Institute of Geophysics, University of Tehran, Tehran, Iran

3 Belle W. Baruch Institute for Marine and Coastal Sciences, University of South Carolina, 209A Sumwalt Building, Columbia, SC 29208.


The Arvand River forms the border between Iran and Iraq and is the only permanent river discharging into the Persian Gulf(PG). It is a tidal river adversely affected by sedimentation,which is more likely resulted from tidal asymmetry. The tidal barrier(TB) has remarkable effects on the tidal regime. To assess these effects on the tidal waves asymmetry,it is critical to study the two main factors of closure percentage(CP) and closure duration(CD). This manuscript aims to investigate the tidal barrier effect on the asymmetry of the tidal waves propagating through the estuary. To evaluate tidal asymmetry,Tidal Asymmetry Index(TAI) is introduced based on the relative phase angle of the M2 and M4 components through the river. A two-dimensional Delft3D hydrodynamic model is utilized. The tidal wave is flood dominant, and its relative phase angle increased slightly, from 90 to 135 degrees in Km 40 and then decreased to just under 90 degrees near the Abadan(65km) and constant along the Abadan to Khorramshahr. The tidal barrier has changed the tidal regime in the river which leads to relatively constant tidal asymmetry during the 45km upward. To reach the highest TAI, a closure percentage and duration of 55% and 180 minutes are estimated. The tidal barrier operation also adversely affects the amplitude of the M2 and M4 components. M4 component amplitude increases before reaching the TB and then decreases. The decrease is more elaborated from kilometer 45 onward. Increasing the closure percentage amplifies the changes described above,but it has little effect on the general trends.


  1. Speirs, D.C. and W.S. Gurney, Population persistence in rivers and estuaries. Ecology, 2001. 82(5): p. 1219-1237.
  2. Teng, L., et al., Lateral Variation of Tidal Mixing Asymmetry and Its Impact on the Longitudinal Sediment Transport in Turbidity Maximum Zone of Salt Wedge Estuary. Journal of Marine Science and Engineering, 2022. 10(7): p. 907.
  3. Zhou, Z., et al., Study of Sediment Transport in a Tidal Channel‐Shoal System: Lateral Effects and Slack‐Water Dynamics. Journal of Geophysical Research: Oceans, 2021. 126(3): p. e2020JC016334.
  4. Teng, L., H. Cheng, and Y. Qiao. Analysis of flow regime in the Turbidity Maximum Zone of Yangtze Estuary based on texture features of Tiangong-2 remote sensing images. in Proceedings of the Tiangong-2 Remote Sensing Application Conference. 2019. Springer.
  5. Kiaghadi, A., et al., Longitudinal patterns in sediment type and quality during daily flow regimes and following natural hazards in an urban estuary: a Hurricane Harvey retrospective. Environmental Science and Pollution Research, 2022. 29(5): p. 7514-7531.
  6. Chen, L., et al., Lateral circulation and associated sediment transport in a convergent estuary. Journal of Geophysical Research: Oceans, 2020. 125(8): p. e2019JC015926.
  7. Valizadeh, D. and M. Kolahdoozan. Effect of Current Deflecting Wall on the Sedimentation in Tidal harbors. in ICHE 2010. Proceedings of the 9th International Conference on Hydro-Science & Engineering, August 2-5, 2010, Chennai, India. 2010.
  8. Van Rijn, L., Tidal phenomena in the Scheldt Estuary. Report, Deltares, 2010. 105: p. 99.
  9. Dronkers, J., Tidal asymmetry and estuarine morphology. Netherlands Journal of Sea Research, 1986. 20(2-3): p. 117-131.
  10. Friedrichs, C.T. and D.G. Aubrey, Non-linear tidal distortion in shallow well-mixed estuaries: a synthesis. Estuarine, Coastal and Shelf Science, 1988. 27(5): p. 521-545.
  11. Nidzieko, N.J., Tidal asymmetry in estuaries with mixed semidiurnal/diurnal tides. Journal of Geophysical Research: Oceans, 2010. 115(C8).
  12. Guo, L., et al., Quantification of tidal asymmetry and its nonstationary variations. Journal of Geophysical Research: Oceans, 2019. 124(1): p. 773-787.
  13. van Leussen, W., Fine sediment transport under tidal action. Geo-marine letters, 1991. 11(3): p. 119-126.
  14. Guo, L., et al., A historical review of sediment export–import shift in the North Branch of Changjiang Estuary. Earth Surface Processes and Landforms, 2022. 47(1): p. 5-16.
  15. Toublanc, F., et al., Fortnightly tidal asymmetry inversions and perspectives on sediment dynamics in a macrotidal estuary (Charente, France). Continental Shelf Research, 2015. 94: p. 42-54.
  16. Ridderinkhof, H., Sediment transport in intertidal areas, in Intertidal Deposits. 2019, CRC Press. p. 363-382.
  17. Wang, Z., et al., Tidal asymmetry and residual sediment transport in estuaries: a literature study and application to the Western Scheldt. 1999.
  18. Gatto, V.M., B.C. van Prooijen, and Z.B. Wang, Net sediment transport in tidal basins: quantifying the tidal barotropic mechanisms in a unified framework. Ocean Dynamics, 2017. 67(11): p. 1385-1406.
  19. Guo, L., et al., Exploring the impacts of multiple tidal constituents and varying river flow on long‐term, large‐scale estuarine morphodynamics by means of a 1‐D model. Journal of Geophysical Research: Earth Surface, 2016. 121(5): p. 1000-1022.
  20. Postma, H., Tidal flat areas, in Coastal-offshore ecosystem interactions. 1988, Springer. p. 102-121.
  21. Godin, G., Frictional effects in river tides. Tidal hydrodynamics, 1991. 379: p. 402.
  22. Guo, L., et al., The role of river flow and tidal asymmetry on 1‐D estuarine morphodynamics. Journal of Geophysical Research: Earth Surface, 2014. 119(11): p. 2315-2334.
  23. Guo, L., et al., River‐tide dynamics: Exploration of nonstationary and nonlinear tidal behavior in the Y angtze R iver estuary. Journal of Geophysical Research: Oceans, 2015. 120(5): p. 3499-3521.
  24. Winterwerp, J.C., Fine sediment transport by tidal asymmetry in the high-concentrated Ems River: indications for a regime shift in response to channel deepening. Ocean Dynamics, 2011. 61(2): p. 203-215.
  25. Wang, Z.B., et al., Morphology and asymmetry of the vertical tide in the Westerschelde estuary. Continental Shelf Research, 2002. 22(17): p. 2599-2609.
  26. Dissanayake, D., J. Roelvink, and M. Van der Wegen, Modelled channel patterns in a schematized tidal inlet. Coastal Engineering, 2009. 56(11-12): p. 1069-1083.
  27. Vos, T., Tidal control in the Lower Ems: An indicative study into the effects of controlled barrier operation on the tidal asymmetry in the Lower Ems river. 2021.
  28. Oberrecht, D. and A. Wurpts, Impact of controlled tidal barrier operation on tidal dynamics in the Ems estuary. Die Küste, 81 Modelling, 2014(81): p. 427-433.
  29. Chernetsky, A.S., H.M. Schuttelaars, and S.A. Talke, The effect of tidal asymmetry and temporal settling lag on sediment trapping in tidal estuaries. Ocean Dynamics, 2010. 60(5): p. 1219-1241.
  30. Kuang, C., et al., Morphological process of a restored estuary downstream of a tidal barrier. Ocean & Coastal Management, 2017. 138: p. 111-123.
  31. Lee, S. and J.L. Lee, Estimation of background erosion rate at Janghang Beach due to the construction of Geum estuary tidal barrier in Korea. Journal of Marine Science and Engineering, 2020. 8(8): p. 551.
  32. Eelkema, M., et al., Morphological effects of the Eastern Scheldt storm surge barrier on the ebb-tidal delta. Coastal Engineering Journal, 2013. 55(3): p. 1350010-1-1350010-26.
  33. Herrling, G., et al., The effect of asymmetric dune roughness on tidal asymmetry in the Weser estuary. Earth Surface Processes and Landforms, 2021. 46(11): p. 2211-2228.
  34. Haghighi, A.T., et al., The impact of river regulation in the Tigris and Euphrates on the Arvandroud Estuary. Progress in Physical Geography: Earth and Environment, 2020. 44(6): p. 948-970.
  35. Hajiabadi, A., S. Sakhdari, and R. Barati, Study of morphologic changes in the past and predicting future changes of border rivers (case study: Arvand River, Iran-Iraq Border Line), in Current Directions in Water Scarcity Research. 2022, Elsevier. p. 153-163.
  36. Etemad‐Shahidi, A., et al., Investigation of hydraulics transport time scales within the Arvand River estuary, Iran. Hydrological Processes, 2014. 28(25): p. 6006-6015.
  37. UN-ESCWA and BGR, Inventory of Shared Water Resources in Western Asia. 2013, UN-ESCWA, BGR Beirut.
  38. Etemad Shahidi, A., A. Saburi, and J. Parsa, Control of salinity intrusion in Arvand estuary under different hydrological conditions. Iran-water resources research, 2011. 7(2): p. 50-60.
  39. Zahed, F., A. Etemad-Shahidi, and E. Jabbari, Modeling of salinity intrusion under different hydrological conditions in the Arvand River Estuary. Canadian Journal of Civil Engineering, 2008. 35(12): p. 1476-1480.
  40. Etemad-Shahidi, A., J. Parsa, and M. Hajiani. Salinity intrusion length: comparison of different approaches. in Proceedings of the Institution of Civil Engineers-Maritime Engineering. 2011. Thomas Telford Ltd.
  41. Etemad-Shahidi, A., et al., Effects of sea level rise on the salinity of Bahmanshir estuary. International journal of environmental science and technology, 2015. 12(10): p. 3329-3340.
  42. Passeri, D.L., et al., The dynamic effects of sea level rise on low‐gradient coastal landscapes: A review. Earth's Future, 2015. 3(6): p. 159-181.
  43. Khojasteh, D., et al., Sea level rise will change estuarine tidal energy: A review. Renewable and Sustainable Energy Reviews, 2022. 156: p. 111855.
  44. Pekel, J.-F., et al., High-resolution mapping of global surface water and its long-term changes. Nature, 2016. 540(7633): p. 418-422.
  45. Hakimdavar, R., et al., Monitoring water-related ecosystems with earth observation data in support of Sustainable Development Goal (SDG) 6 reporting. Remote Sensing, 2020. 12(10): p. 1634.
  46. Jiang, L., et al., Effects of sea-level rise on tides and sediment dynamics in a Dutch tidal bay. Ocean Science, 2020. 16(2): p. 307-321.
  47. Lesser, G.R., et al., Development and validation of a three-dimensional morphological model. Coastal engineering, 2004. 51(8-9): p. 883-915.
  48. Van der Wegen, M. and J. Roelvink, Long‐term morphodynamic evolution of a tidal embayment using a two‐dimensional, process‐based model. Journal of Geophysical Research: Oceans, 2008. 113(C3).
  49. Weatherall, P., et al., A new digital bathymetric model of the world's oceans. Earth and space Science, 2015. 2(8): p. 331-345.
  50. Alosairi, Y. and T. Pokavanich, Seasonal circulation assessments of the northern Arabian/Persian Gulf. Marine pollution bulletin, 2017. 116(1-2): p. 270-290.
  51. Gupta, H.V., et al., Decomposition of the mean squared error and NSE performance criteria: Implications for improving hydrological modelling. Journal of hydrology, 2009. 377(1-2): p. 80-91.
  52. Khajehei, S. and H. Moradkhani, Towards an improved ensemble precipitation forecast: A probabilistic post-processing approach. Journal of Hydrology, 2017. 546: p. 476-489.
  53. Guo, W., et al., Contributions of different tidal interactions to fortnightly variation in tidal duration asymmetry. Journal of Geophysical Research: Oceans, 2016. 121(8): p. 5980-5994.
  54. Song, D., et al., Modeling studies of the far-field effects of tidal flat reclamation on tidal dynamics in the East China Seas. Estuarine, Coastal and Shelf Science, 2013. 133: p. 147-160.
  55. Jewell, S.A., D.J. Walker, and A.B. Fortunato, Tidal asymmetry in a coastal lagoon subject to a mixed tidal regime. Geomorphology, 2012. 138(1): p. 171-180.
  56. Blanton, J.O., G. Lin, and S.A. Elston, Tidal current asymmetry in shallow estuaries and tidal creeks. Continental Shelf Research, 2002. 22(11-13): p. 1731-1743.
  57. Van de Kreeke, J. and K. Robaczewska, Tide-induced residual transport of coarse sediment; application to the Ems estuary. Netherlands Journal of Sea Research, 1993. 31(3): p. 209-220.
  58. Speer, P.E., D.G. Aubrey, and C.T. Friedrichs, Nonlinear hydrodynamics of shallow tidal inlet/bay systems. Tidal hydrodynamics, 1991. 321: p. 339.
  59. Lafta, A.A., Investigation of tidal asymmetry in the Shatt Al-Arab river estuary, Northwest of Arabian Gulf. Oceanologia, 2022. 64(2): p. 376-386.
  60. Lu, S., et al., Propagation of tidal waves up in Y angtze E stuary during the dry season. Journal of Geophysical Research: Oceans, 2015. 120(9): p. 6445-6473.