Hydrobiologia

, Volume 247, Issue 1–3, pp 141–161 | Cite as

Hydrodynamics of mangrove swamps and their coastal waters

  • Eric Wolanski
Chemical and physical processes

Abstract

Mangrove swamps help control the tidal hydrodynamics of many tropical estuaries. They generate an asymmetry of the tidal currents in both the tidal creeks and the mangrove swamps. This results in self-scouring of the tidal channels. Mangrove land reclamation results in siltation of the channel. Mangrove swamps control the flushing rates of the estuaries through the lateral trapping effect. Lateral trapping leads to the aggregation of mangrove litter along slick lines. Evapotranspiration plays a role in the hot dry season by forming a salinity maximum zone which isolates the estuary from the coastal waters for several months of the year. In the absence of runoff, evapotranspiration in the hot dry season generates an inverse estuarine circulation which can trap high salinity mangrove water, and mangrove detritus, along the bottom of a mangrove creek. This bottom layer can become anaerobic. Groundwater flow appears to play a key role in the nutrient budget of mangrove creeks, exporting salt left behind by evapotranspiration, and inhibiting runoff after rainfall. Particulates and dissolved nutrients outwelled from mangrove swamps to coastal waters are retained in a coastal boundary layer. This coastal boundary layer water can be trapped along the shore for long periods if the coast is straight and mangrove-fringed and the coastal waters are shallow. Headlands inhibit coastal trapping because they enhance mixing. Nutrient-rich coastal boundary layer waters may be ejected offshore as tidal jets peeling off headlands and locally enriching offshore waters.

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References

  1. Awaji, T. A., N. Imasato & H. Kunishi, 1980. Tidal exchange through a strait: A numerical experiment using a simple model basin. J. Phys. Oceanogr. 10: 1499–1508.Google Scholar
  2. Awaji, T., 1982. Water mixing in a tidal current and the effect of turbulence on tidal exchange through a strait. J. Phys. Oceanogr. 12: 501–514.Google Scholar
  3. Black, K. P., 1988. The relationship of reef hydrodynamics to variation in number of planktonic larvae on and around coral reefs. Proc. 6th. Int. Coral Reef Symposium, Townsville, Vol. 2.Google Scholar
  4. Black, K. P. & S. L. Gay, 1987. Eddy formation in unsteady flows. J. geophys. Res. 92: 9514–9522.Google Scholar
  5. Boto, K. & J. S. Bunt, 1981. Tidal export of particulate organic matter from a northern Australian mangrove system. Estuar. coast. Shelf Sci. 13: 247–255.Google Scholar
  6. Bowden, K. F. & P. Hamilton, 1975. Some experiments with a numerical model of circulation and mixing in a tidal estuary. Estuar. coast. Mar. Sci. 3: 281–301.Google Scholar
  7. Bowman, M. J., 1988. Estuarine fronts. In B. Kjerfve (ed.), Hydrodynamics of estuaries, Vol. 1, CRC Press, Boca Raton, Florida, 85–132.Google Scholar
  8. Bouyne, P. & J. D. Roux, 1978. Remarques sur la circulation d'eaux turbides d'origine amazonienne le long de la cote des Guyanes. C.r. Acad. Sci. Paris, 287, Serie D.: 203–205.Google Scholar
  9. Burke, R. W. & K. H. Stolzenbach, 1983. Free surface flow through salt marsh grass. Massachusetts Institute of Technology Sea Grant College Program, Publication No. MITSG 83–16, Cambridge, MA., 252 pp.Google Scholar
  10. Deleersnijder, E., E. Wolanski & A. Norro, 1989. Numerical simulation of the three-dimensional tidal circulation in an island's wake. In G. M. Carlomagno & C. A. Brebbia (eds), Computer and experiments in fluid flow. Computational Publications, Springer-Verlag, Berlin: 355–381.Google Scholar
  11. Elder, J. W., 1959. The dispersion of marked fluid in turbulent shear flow. J. Fluid Mech. 5: 544–560.Google Scholar
  12. Falconer, R. A., E. Wolanski & L. Mardapitta-Hadjipandeli, 1986. Modelling tidal circulation in an island's wake. J. Waterway, Port, Coastal and Ocean Engineering, ASCE, 112: 234–254.Google Scholar
  13. Fischer, H. B., E. J. List, R. C. Y. Koh, J. Imberger & N. H. Brooks, 1979. Mixing in inland and coastal waters. Academic Press, New York, 484 pp.Google Scholar
  14. Geyer, W. R. & R. P. Signell, 1990. A reassessment of the role of tidal dispersion in estuaries and bays. Estuaries, in press.Google Scholar
  15. Geyer, W. R. & R. P. Signell, 1990. Measurements of tidal flow around a headland with a shipboard acoustic Doppler current profiler. J. geophys. Res. 95: 3159–3197.Google Scholar
  16. Mazda, Y., Y. Sato, S. Swamoto, H. Yokochi & E. Wolanski, 1990. Links between physical, chemical and biological processes in Bashita-Minato, a mangrove swamp in Japan. Estuar. coast. Shelf Sci., in press.Google Scholar
  17. Mazda, Y., H. Yokochi & Y. Sato, 1990. The behaviour of groundwater in a mangrove area and the influence on the properties of water and bottom mud. Estuar. coast. Shelf Sci. 31: 621–638.Google Scholar
  18. Murray, S. P. & M. Young, 1985. The nearshore current along a high-rainfall, tradewind coast — Nicaragua. Estuar. Coast. Shelf Sci. 21: 687–699.Google Scholar
  19. Nokes, R. I., 1986. Problems in turbulent dispersion. Ph.D. Thesis, Dept. Civil Eng., Univ. of Canterbury, Christchurch, New Zealand, 229 pp.Google Scholar
  20. Okubo, A., 1973. Effect of shoreline irregularities on streamwise dispersion in estuaries and other embayments. Neth. J. Sea Res. 6: 213–224.Google Scholar
  21. Ovalle, A. R. C., C. E. Rezende, L. D. Lacerda & C. A. R. Silva, 1990. Factors affecting the hydrochemistry of a mangrove tidal creek, Sepetiba Bay, Brazil. Estuar. coast. Shelf Sci.: 639–650.Google Scholar
  22. Ozsoy, E., 1977. Flow and mass transport in the vicinity of tidal inlets. Technical Rep. UFL/COEL/TR-036, Coastal and Oceanographic Engineering Department, University of Florida.Google Scholar
  23. Pattiaratchi, C., A. James & M. Collins, 1987. Island wakes and headland eddies: a comparison between remotely sensed data and laboratory experiments. J. geophys. Res. 92: 783–794.Google Scholar
  24. Petryk, S. & G. Bosmajan, 1975. An analysis a flow through vegetation. J. Hydraul. Div., Am. Soc. Civil Eng. 101: 871–874.Google Scholar
  25. Pingree, R. D. & L. Maddock, 1979. The tidal physics of headland flows and offshore tidal bank formation. Mar. Geol. 32: 269–289.Google Scholar
  26. Ridd, P. V., M. W. Sandstrom & E. Wolanski, 1988. Outwelling from tropical tidal salt flats. Estuar. coast. Shelf Sci. 26: 243–253.Google Scholar
  27. Ridd, P. V., E. Wolanski & Y. Mazda, 1990. Longitudinal diffusion in mangrove-fringed tidal creeks. Estuar. coast. Shelf Sci. 31: 541–554.Google Scholar
  28. Robertson, A. I., D. M. Alongi, P. Daniel & K. G. Boto, 1988. How much mangrove detritus enters the Great Barrier reef lagoon? Proc. 6th. Inter. Symp. Coral Reefs, Townsville, Aug. 1988.Google Scholar
  29. Signell, R. P., 1989. Tidal dynamics and dispersion around coastal headlands. Ph.D. thesis, MIT/WHOI-89–38.Google Scholar
  30. Signell, R. P. & W. R. Geyer, 1990. Numerical simulation of tidal dispersion around a coastal headland. In R. T. Cheng (ed.), Residual currents and long-term transport in estuaries and bays, Lecture notes on Coastal and Estuarine Studies, Springer-Verlag: 210–222.Google Scholar
  31. Simpson, J. H. & I. D. James, 1986. Convergent fronts in the circulation on tidal estuaries. In D. A. Wolfe (ed.), Estuarine variability. Academic Press, London.Google Scholar
  32. Taylor, G. I., 1921. Diffusion by continuous movements. Proc. London Math. Soc., Ser. A, 20: 196–211.Google Scholar
  33. Tee, K. T., 1976. Tide-induced residual current, a 2-D nonlinear numerical tidal model. J. Mar. Res. 34: 603–628.Google Scholar
  34. Thompson, R. O. R. Y. & T. J. Golding, 1981. Tidally induced upwelling by the Great Barrier Reef. J. geophys. Res. 86: 6517–6521.Google Scholar
  35. Uncles, R., J. E. Ong & W. K. Gong, 1990. Observations and analysis of a stratification-destratification event in a tropical estuary. Estuar. coast. Shelf Sci. 31: 651–666.Google Scholar
  36. van Senden, D., 1985. Structure of tidal jets under variable source conditions. Proc. 21st Congress I.A.H.R., Melbourne, 3C, pp. AI/3–AI/8.Google Scholar
  37. Wattayakorn, G., E. Wolanski & B. Kjerfve, 1990. Mixing, trapping and outwelling in the Klong Ngao mangrove swamp, Thailand. Estuar. coast. Shelf Sci., in press.Google Scholar
  38. Williams, D. McB., 1988. Significance of coastal resources to sailfish and blackmarlin in NE Australia: an on-going research program. Proc. International Billfish Symposium II, Kailua-Kona, Hawaii, Aug. 1–5, 1988.Google Scholar
  39. Wolanski, E., 1986. An evaporation-driven salinity maximum zone in Australian tropical estuaries. Estuar. coast. Shelf Sci. 22: 415–424.Google Scholar
  40. Wolanski, E., 1989. Measurements and modeling of the water circulation in mangrove swamps. UNESCO-COMARAF Serie Documentaire No. 3, 43 pp.Google Scholar
  41. Wolanski, E., 1989. Circulation anomalies in tropical Australian estuaries. In B. J. Kjerfve (ed.), Hydrodynamics of estuaries. Vol. II, CRC Press, Boca Raton: 53–59.Google Scholar
  42. Wolanski, E. & R. Gardiner, 1981. Flushing of salt from mangroves. Aust. J. mar. Freshwat. Res. 32: 681–683.Google Scholar
  43. Wolanski, E. & W. M. Hamner, 1988. Topographically controlled fronts in the ocean and their biological influence. Science 241: 177–181.Google Scholar
  44. Wolanski, E. & B. King, 1990. Flushing of Bowden Reef lagoon. Estuar. coast. Shelf Sci. 31: 789–804.Google Scholar
  45. Wolanski, E. & P. Ridd, 1986. Tidal mixing and trapping in mangrove swamps. Estuar. coast. Shelf Sci. 23: 759–771.Google Scholar
  46. Wolanski, E. & P. Ridd, 1990. Mixing and trapping in Australian tropical coastal waters. In R. T. Cheng (ed.), Residual currents and long-term transport in estuaries and bays. Lecture notes on Coastal and Estuarine Studies, Springer-Verlag: 165–183.Google Scholar
  47. Wolanski, E. & D. van Senden, 1983. Mixing of Burdekin River flood waters in the Great Barrier Reef. Austr. J. mar. Freshwat. Res. 34: 49–63.Google Scholar
  48. Wolanski, E., D. Burrage & B. King, 1989. Trapping and dispersion of coral eggs around Bowden Reef, Great Barrier Reef, following mass coral spawning. Contin. Shelf Res. 9: 479–496.Google Scholar
  49. Wolanski, E., J. Imberger & M. L. Heron, 1984. Island wakes in shallow coastal waters. J. geophys. Res. 89: 10553–10569.Google Scholar
  50. Wolanski, E., M. Jones & J. S. Bunt, 1980. Hydrodynamics of a tidal creek-mangrove swamp system. Aust. J. mar. Freshwat. Res. 31: 431–450.Google Scholar
  51. Wolanski, E., E. Drew, K. Abel & J. O'Brien, 1988. Tidal jets, nutrient upwelling, and their influence on the productivity of the alga Halimeda in the Ribbon Reefs, Great Barrier Reef. Estuar. coast. Shelf Sci. 26: 169–201.Google Scholar
  52. Wolanski, E., Y. Mazda, B. King & S. Gay, 1990. Dynamics, flushing and trapping in Hinchinbrook Channel, a giant mangrove swamp, Australia. Estuar. coast. Shelf Sci. 31: 555–580.Google Scholar

Copyright information

© Kluwer Academic Publishers 1992

Authors and Affiliations

  • Eric Wolanski
    • 1
  1. 1.Australian Institute of Marine ScienceTownsville M.C.Australia

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