Groyne-Induced Effects on Channel-Shoal Exchange and Saltwater Intrusion in Estuarine Environments
Publication: Journal of Hydraulic Engineering
Volume 150, Issue 1
Abstract
Existing knowledge about groyne-induced effects is primarily based on riverine or coastal environments where salinity gradients are absent or limited. However, in estuaries, salinity gradients drive physical processes such as longitudinal and lateral residual flows. The effect of groynes is much more complex because they can modulate channel hydrodynamics and directly affect lateral salinity gradients. In this study, an idealized model is applied to investigate the effects of groyne layouts in estuarine environments, including effects on (1) channel hydrodynamics, (2) lateral water exchange, (3) Coriolis effects, and (4) saltwater intrusion. Model results show that the aspect ratio (the width of groyne fields to the length of groynes) of groyne fields plays an important role. Groynes also induce asymmetry of lateral flows, for example, increasing near-bottom shoal-to-channel flows during low water slack. The aspect ratio has opposite effects on horizontal and vertical components of water exchange. A large aspect ratio strengthens horizontal exchange and weakens density-driven currents. For a large-scale groyne field (several kilometers), Coriolis effects introduce a substantial difference in exchange mechanisms along the north and south banks. A medium range of aspect ratio (2.0–3.0) leads to the strongest saltwater intrusion during both neap and spring tides.
Practical Applications
Dikes and groynes are common engineering structures in waterways designed to increase along-channel flow velocities and prevent sediment deposition, thereby maintaining navigability. However, especially in estuarine environments, cross-channel flow velocities resulting from these structures may generate sediment transport toward the channel, in contrast to their original intention. Another important impact of these structures is on saltwater intrusion, which is crucial to freshwater resource management. Therefore, this research investigates the groyne-induced effects on cross-channel flows and the saltwater intrusion problem by comparing different layouts of groynes and their consequences. Two important findings may benefit practical applications. First, the interaction between saltwater and freshwater in estuaries enhances cross-channel flows during certain periods, thereby influencing sediment transport. Second, the maximal saltwater intrusion occurs for intermediate width-to-length ratios of the groynes, with lower saltwater intrusion for either very small or very wide groyne fields.
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Data Availability Statement
All data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
This research is supported by the National Key R&D Program of China (Grant No. 2022YFE0117500), the National Natural Science Foundation of China (Grant No. 41776104), and KNAW Project (Grant PSA-SA-E-02).
References
Beardsley, R. C., C. Chen, and Q. Xu. 2013. “Coastal flooding in Scituate (MA): A FVCOM study of the 27 December 2010 nor’easter.” J. Geophys. Res.: Oceans 118 (11): 6030–6045. https://doi.org/10.1002/2013JC008862.
Biron, P. M., C. Robson, M. F. Lapointe, and S. J. Gaskin. 2005. “Three-dimensional flow dynamics around deflectors.” River Res. Appl. 21 (9): 961–975. https://doi.org/10.1002/rra.852.
Blumberg, A. F., and L. H. Kantha. 1985. “Open boundary condition for circulation models.” J. Hydraul. Eng. 111 (2): 237–255. https://doi.org/10.1061/(ASCE)0733-9429(1985)111:2(237).
Chen, C., R. C. Beardsley, G. Cowles, J. Qi, Z. Lai, G. Gao, D. Stuebe, Q. Xu, P. Xue, and J. Ge. 2013. An unstructured grid, finite-volume Community Ocean model FVCOM user manual. Dartmouth, MA: School of Marine Science and Technology, Univ. of Massachusetts-Dartmouth.
Chen, L., W. Gong, H. Zhang, L. Zhu, and W. Cheng. 2020. “Lateral circulation and associated sediment transport in a convergent estuary.” J. Geophys. Res.: Oceans 125 (8): e2019JC015926. https://doi.org/10.1029/2019jc015926.
Chen, W., and H. E. de Swart. 2018. “Longitudinal variation in lateral trapping of fine sediment in tidal estuaries: Observations and a 3D exploratory model.” Ocean Dyn. 68 (3): 309–326. https://doi.org/10.1007/s10236-018-1134-z.
Ge, J., C. Chen, J. Qi, P. Ding, and R. C. Beardsley. 2012. “A dike–groyne algorithm in a terrain-following coordinate ocean model (FVCOM): Development, validation and application.” Ocean Modell. 47 (Jan): 26–40. https://doi.org/10.1016/j.ocemod.2012.01.006.
Ge, J., C. Chen, Z. B. Wang, K. Ke, J. Yi, and P. Ding. 2020. “Dynamic response of the fluid mud to a tropical storm.” J. Geophys. Res.: Oceans 125 (3): e2019JC015419. https://doi.org/10.1029/2019JC015419.
Ge, J., P. Ding, and C. Chen. 2015a. “Low-salinity plume detachment under non-uniform summer wind off the Changjiang Estuary.” Estuarine Coastal Shelf Sci. 156 (Apr): 61–70. https://doi.org/10.1016/j.ecss.2014.10.012.
Ge, J., P. Ding, C. Chen, S. Hu, G. Fu, and L. Wu. 2013. “An integrated East China Sea–Changjiang Estuary model system with aim at resolving multi-scale regional–shelf–estuarine dynamics.” Ocean Dyn. 63 (Aug): 881–900. https://doi.org/10.1007/s10236-013-0631-3.
Ge, J., J. Lu, J. Zhang, C. Chen, A. Liu, and P. Ding. 2022. “Saltwater intrusion-induced flow reversal in the Changjiang Estuary.” J. Geophys. Res.: Oceans 127 (11): e2021JC018270. https://doi.org/10.1029/2021JC018270.
Ge, J., F. Shen, W. Guo, C. Chen, and P. Ding. 2015b. “Estimation of critical shear stress for erosion in the Changjiang Estuary: A synergy research of observation, GOCI sensing and modeling.” J. Geophys. Res.: Oceans 120 (12): 8439–8465. https://doi.org/10.1002/2015JC010992.
Glas, M., K. Glock, M. Tritthart, M. Liedermann, and H. Habersack. 2018. “Hydrodynamic and morphodynamic sensitivity of a river’s main channel to groyne geometry.” J. Hydraul. Res. 56 (5): 714–726. https://doi.org/10.1080/00221686.2017.1405369.
Hesse, R. F., A. Zorndt, and P. Fröhle. 2019. “Modelling dynamics of the estuarine turbidity maximum and local net deposition.” Ocean Dyn. 69 (Apr): 489–507. https://doi.org/10.1007/s10236-019-01250-w.
Hu, K., P. Ding, Z. Wang, and S. Yang. 2009. “A 2D/3D hydrodynamic and sediment transport model for the Yangtze Estuary, China.” J. Mar. Syst. 77 (1–2): 114–136. https://doi.org/10.1016/j.jmarsys.2008.11.014.
Huang, H., C. Chen, G. W. Cowles, C. D. Winant, R. C. Beardsley, K. S. Hedstrom, and D. B. Haidvogel. 2008. “FVCOM validation experiments: Comparisons with ROMS for three idealized barotropic test problems.” J. Geophys. Res.: Oceans 113 (C7): 1–14. https://doi.org/10.1029/2007JC004557.
Lin, J., B. C. van Prooijen, L. Guo, C. Zhu, Q. He, and Z. B. Wang. 2021. “Regime shifts in the Changjiang (Yangtze River) Estuary: The role of concentrated benthic suspensions.” Mar. Geol. 433 (Mar): 106403. https://doi.org/10.1016/j.margeo.2020.106403.
McCoy, A., G. Constantinescu, and L. Weber. 2007. “A numerical investigation of coherent structures and mass exchange processes in channel flow with two lateral submerged groynes.” Water Resour. Res. 43 (5): 1–26. https://doi.org/10.1029/2006WR005267.
Mellor, G. L., and T. Yamada. 1982. “Development of a turbulence closure model for geophysical fluid problems.” Rev. Geophys. 20 (4): 851–875. https://doi.org/10.1029/RG020i004p00851.
Ouillon, S., and D. Dartus. 1997. “Three-dimensional computation of flow around groyne.” J. Hydraul. Eng. 123 (11): 962–970. https://doi.org/10.1061/(ASCE)0733-9429(1997)123:11(962).
Pawlowicz, R., B. Beardsley, and S. Lentz. 2002. “Classical tidal harmonic analysis including error estimates in MATLAB using T_TIDE.” Comput. Geosci. 28 (8): 929–937. https://doi.org/10.1016/S0098-3004(02)00013-4.
Shore, J. A. 2009. “Modelling the circulation and exchange of Kingston Basin and Lake Ontario with FVCOM.” Ocean Modell. 30 (2–3): 106–114. https://doi.org/10.1016/j.ocemod.2009.06.007.
Smagorinsky, J. 1963. “General circulation experiments with the primitive equations.” Mon. Weather Rev. 91 (3): 99–164. https://doi.org/10.1175/1520-0493(1963)091%3C0099:GCEWTP%3E2.3.CO;2.
Sukhodolov, A., W. S. J. Uijttewaal, and C. Engelhardt. 2002. “On the correspondence between morphological and hydrodynamical patterns of groyne fields.” Earth Surf. Processes Landforms 27 (3): 289–305. https://doi.org/10.1002/esp.319.
Ten Brinke, W. B. M., F. H. Schulze, and P. van Der Veer. 2004. “Sand exchange between groyne-field beaches and the navigation channel of the Dutch Rhine: The impact of navigation versus river flow.” River Res. Appl. 20 (8): 899–928. https://doi.org/10.1002/rra.809.
Tritthart, M., M. Liedermann, and H. Habersack. 2009. “Modelling spatio-temporal flow characteristics in groyne fields.” River Res. Appl. 25 (1): 62–81. https://doi.org/10.1002/rra.1169.
Uijttewaal, W. S. 2005. “Effects of groyne layout on the flow in groyne fields: Laboratory experiments.” J. Hydraul. Eng. 131 (9): 782–791. https://doi.org/10.1061/(ASCE)0733-9429(2005)131:9(782).
Uijttewaal, W. S. J., D. Lehmann, and A. van Mazijk. 2001. “Exchange processes between a river and its groyne fields: Model experiments.” J. Hydraul. Eng. 127 (11): 928–936. https://doi.org/10.1061/(ASCE)0733-9429(2001)127:11(928).
Vanlede, J., and A. Dujardin. 2014. “A geometric method to study water and sediment exchange in tidal harbors.” Ocean Dyn. 64 (Nov): 1631–1641. https://doi.org/10.1007/s10236-014-0767-9.
van Maren, D. S., T. van Kessel, K. Cronin, and L. Sittoni. 2015. “The impact of channel deepening and dredging on estuarine sediment concentration.” Cont. Shelf Res. 95 (Mar): 1–14. https://doi.org/10.1016/j.csr.2014.12.010.
Wei, E., A. Zhang, Z. Yang, Y. Chen, J. Kelley, F. Aikman, and D. Cao. 2014. “NOAA’s nested northern Gulf of Mexico operational forecast systems development.” J. Mar. Sci. Eng. 2 (1): 1–17. https://doi.org/10.3390/jmse2010001.
Wu, L., C. Chen, P. Guo, M. Shi, J. Qi, and J. Ge. 2011. “A FVCOM-based unstructured grid wave, current, sediment transport model, I. Model description and validation.” J. Ocean Univ. China 10 (Mar): 1–8. https://doi.org/10.1007/s11802-011-1788-3.
Yossef, M. F. M., and H. J. de Vriend. 2010. “Sediment exchange between a river and its groyne fields: Mobile-bed experiment.” J. Hydraul. Eng. 136 (9): 610–625. https://doi.org/10.1061/(ASCE)HY.1943-7900.0000226.
Yossef, M. F. M., and H. J. de Vriend. 2011. “Flow details near river groynes: Experimental investigation.” J. Hydraul. Eng. 137 (May): 504–516. https://doi.org/10.1061/(ASCE)HY.1943-7900.0000326.
Zhou, Z., J. Ge, D. S. van Maren, Z. B. Wang, Y. Kuai, and P. Ding. 2021. “Study of sediment transport in a tidal channel-shoal system: Lateral effects and slack-water dynamics.” J. Geophys. Res.: Oceans 126 (3): e2020JC016334. https://doi.org/10.1029/2020JC016334.
Zhou, Z., J. Ge, Z. B. Wang, D. S. Maren, J. Ma, and P. Ding. 2019. “Study of lateral flow in a stratified tidal channel-shoal system: The importance of intratidal salinity variation.” J. Geophys. Res.: Oceans 124 (9): 6702–6719. https://doi.org/10.1029/2019JC015307.
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Journal of Hydraulic Engineering
Volume 150 • Issue 1 • January 2024
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© 2023 American Society of Civil Engineers.
History
Received: Sep 10, 2022
Accepted: Aug 18, 2023
Published online: Oct 20, 2023
Published in print: Jan 1, 2024
Discussion open until: Mar 20, 2024
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