, Volume 608, Issue 1, pp 3–20 | Cite as

Circulation and the nutrient budget in Myall Lakes

  • Brian G. Sanderson


A two-dimensional model is used to study transport of material within Myall Lakes and is coupled to the ocean using a one-dimensional model of Lower Myall River. Runoff from the catchment is calculated from water levels and compares favourably with rainfall assuming an average runoff yield of 28% and a runoff coefficient of 47% for events above the 90th percentile. Most of the runoff enters Bombah Broadwater which is also the only basin connected to the ocean. Intermittent runoff events rapidly displace water from Bombah Broadwater into Boolambayte Lake and from Boolambayte Lake into Myall Lake. Displaced water is mixed within basins by wind-driven circulation within the time scale that levels fall as water drains from the lakes to the ocean. Only 7% of the nutrient load entering Bombah Broadwater becomes resident Myall Lake. About 40% of the nutrient load entering Boolambayte Lake becomes resident in Myall Lake. Median time scales for loss of conservative material entering each basin with the runoff are: 140 days for Bombah Broadwater, 118 days for Boolambayte Lake, and 535 days for Myall Lake. Salinity fluctuates greatly in Bombah Broadwater but is stable in Myall Lake. Material loss from Bombah Broadwater is characterized by many time scales associated with runoff from the catchment and low-frequency changes in ocean water level. Comparison of observed distributions of total nitrogen with simulations indicates that there are sources of total nitrogen in Boolambayte Lake and Myall Lake and sinks of total nitrogen in Bombah Broadwater. There appear to be sinks of total phosphorus throughout the Myall Lakes.

Key words

Flushing Runoff Currents Nutrient Source Sink 



The author thanks J. Wilson, A. M. Redden, T. Asaeda, and G. Coade for sharing measurements that inspired and underpin this work. Wind measurements were provided by the Bureau of Meteorology and water level measurements by Manly Hydraulics Laboratory. Comments by anonymous reviewers helped the author identify and correct a substantive error in the first draft.


  1. Abdelrhman, M. A., 2003. Effect of eelgrass Zostera marina canopies on flow and transport. Marine Ecology Progress Series 248: 67–83.CrossRefGoogle Scholar
  2. Amorocho, J. & J. J. DeVries, 1980. A new evaluation of the wind stress coefficient over water surfaces. Journal of Geophysical Research 85: 433–442.CrossRefGoogle Scholar
  3. Arakawa, A. & V. R. Lamb, 1977. Computational design of the basic dynamical processes of the UCLA general circulation model. Methods of Computational Physics 17: 174–265.Google Scholar
  4. Asaeda, T., L. Rajapakse & B. G. Sanderson, 2007. Morphological and reproductive acclimations to growth of two charophyte species in shallow and deep water. Aquatic Botany 86: 393–401.CrossRefGoogle Scholar
  5. Atkinson, G., M. Hutchings, P. Johnson, W. D. Johnson & M. D. Melville, 1981. An ecological investigation of the Myall Lakes region. Australian Journal of Ecology 6: 299–327.CrossRefGoogle Scholar
  6. Boris, J. P., F. F. Grinstein, E. S. Oran & R. L. Kolbe, 1992. New insights into large-eddy simulation. Fluid Dynamics Research 10: 199–228.CrossRefGoogle Scholar
  7. Bouws, E., H. Gunther, W. Rosenthal & C. L. Vincent, 1985. Similarity of the wind wave spectrum in finite depth water. 1. Spectral form. Journal of Geophysical Research 90: 975–986.CrossRefGoogle Scholar
  8. Cleugh, H. A. & D. E. Hughes, 2002. Impact of shelter on crop microclimates: a synthesis of results from wind tunnel and field experiments. Australian Journal of Experimental Agriculture 42: 679–701.CrossRefGoogle Scholar
  9. Cohen, D., 2004. An examination of planktonic processes in the Myall Lakes. B.Sc. Honours Thesis, University of Newcastle, Newcastle.Google Scholar
  10. Dasey, M., A. Raine, N. Ryan, J. Wilson & N. Cook, 2004. Understanding blue-green algaeblooms in Myall Lakes NSW. New South Wales Department of Infrastructure Planning and Natural Resources, NSW Government, ISBN 0 7347 5498 1Google Scholar
  11. Elliot, W. P., 1958. The growth of the atmospheric internal boundary-layer. Eos, Transactions, American Geophysical Union, 39: 1048–1054.Google Scholar
  12. 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.Google Scholar
  13. Flett, I., 2003. The History of Algal Blooms in Myall Lakes. Department of Environmental Sciences. Undergraduate Thesis. Sydney, University of Technology: 1–69.Google Scholar
  14. Gill, A. E., 1982. Atmosphere-Ocean Dynamics. Academic Press, London.CrossRefGoogle Scholar
  15. Harris, G. P., 2001. The biogeochemistry of nitrogen and phosphorus in Australian catchments, rivers and estuaries: effects of land use and flow regulation and comparisons with global patterns. Marine and Freshwater Research 5: 139–149.CrossRefGoogle Scholar
  16. Hunter, J. R. & C. J. Hearne, 1987. Lateral and vertical variations in the wind-driven circulations in long, shallow lakes. Journal of Geophysical Research 92 (C12): 13106–13114.CrossRefGoogle Scholar
  17. Kirwan, A. D., J. K. Lewis, A. W. Indest, P. Reinersman & I. Quintero, 1988. Observed and simulated kinematic properties of loop current rings. Journal of Geophysical Research 93(C2): 1189–1198.CrossRefGoogle Scholar
  18. Kufel, L. & I. Kufel, 2002. Chara beds acting as nutrient sinks in shallow lakes—a review. Aquatic Botany 72: 249–260.CrossRefGoogle Scholar
  19. Leonard, B. P., 1996. Bounded higher-order upwind multidimensional finite-volume convection-diffusion algorithms. In Minkowicz, W. J. & E. M. Sparrow (eds) Advances in Numerical Heat Transfer, Vol. 1, Taylor and Francis, Washington DC: 1–57.Google Scholar
  20. Okubo, A., 1970. Horizontal dispersion of floatable particles in the vicinity of velocity singularities such as convergences. Deep Sea Research 17: 445–454.Google Scholar
  21. Paerl, H. W., 1992. Growth and reproductive strategies of freshwater blue-green algae (cyanobacteria). In Sandgren, C. D. (ed.), Growth and Reproductive Strategies of Freshwater Phytoplankton. Cambridge University Press, Cambridge: 261–315.Google Scholar
  22. Palmer, D., D. J. Fredericks, C. Smith, G. Logan & D. T. Heggie, 2000. Benthic Nutrient Fluxes in Bombah Broadwater, Myall Lakes. Australian Geological Survey Organisation, Professional opinion, No. 2000/33.Google Scholar
  23. Rubbert, S. & J. Kongeter, 2005. Measurements and three-dimensional simulations of flow in a shallow reservoir subject to small-scale wind field inhomogeneities induced by sheltering. Aquatic Sciences 67: 104–121.CrossRefGoogle Scholar
  24. Sanderson, B. G., T. Asaeda, L. Rajapakse & A. M. Redden, 2008. Mechanisms affecting biomass and distribution of Charophytes and Najas marina in Myall Lake, New South Wales, Australia. Hydrobiologia. doi: 10.1007/s10750-008-9373-5.
  25. Sanderson, B. G. & B. Baginska, 2007. Calculating flow into coastal lakes from water level measurements. Environmental Modelling & Software 22: 774–786.CrossRefGoogle Scholar
  26. Sanderson, B. G. & G. B. Brassington, 2002. Fourth- and fifth-order finite-difference methods applied to a control-volume ocean model. Journal of Atmospheric and Oceanic Technology 19: 1424–1441.CrossRefGoogle Scholar
  27. Sanderson, B. G., A. Okubo, I. T. Webster, S. Kioroglou & R. Appeldoorn, 1995. Observations and idealized models of dispersion on the southwestern Puerto Rican insular shelf. Mathematical and Computational Modelling 21: 39–63.CrossRefGoogle Scholar
  28. Schwarz, A. & I. Hawes, 1997. Effects of changing water clarity on characean biomass and species composition in a large oligotrophic lake. Aquatic Botany 56: 169–181.CrossRefGoogle Scholar
  29. Shilla, D., T. Asaeda, T. Fujino & B. Sanderson, 2006. Decomposition of dominant submerged macrophytes: implications for nutrient release in Myall Lake, NSW, Australia. Wetlands Ecology and Management 14: 427–433.CrossRefGoogle Scholar
  30. Siong, K., & T. Asaeda, 2006. Does calcite encrustation in Chara provide a phosphorus nutrient sink? Journal of Environmental Quality 35: 490–494.PubMedCrossRefGoogle Scholar
  31. Siong, K., T Asaeda, T. Fujino & A. Redden, 2006. Difference characteristics of phosphorus in Chara and two submerged angiosperm species: implications for phosphorus nutrient cycling in an aquatic ecosystem. Wetlands Ecology and Management, 14: 505–510.CrossRefGoogle Scholar
  32. Skilbeck, G. C., T. C. Rolph, N. Hill, J. Woods & R. H. Wilkens, 2005. Holocene millennial/centennial-scale multiproxy cyclicity in temperate eastern Australian estuary sediments. Journal of Quaternary Science 20: 327–347.CrossRefGoogle Scholar
  33. Sterner, R. W., J. J. Elser, E. J. Fee, S. J. Guildford & T. H. Chrzanowski, 1997. The light: nutrient ratio in lakes: the balance of energy and materials affects ecosystem structure and process. The American Naturalist 150: 663–684.CrossRefGoogle Scholar
  34. Wilson, R. E. & A. Okubo, 1978. Longitudinal dispersion in a partially mixed estuary. Journal of Marine Research 36: 427–447.Google Scholar

Copyright information

© Springer Science+Business Media B.V. 2008

Authors and Affiliations

  1. 1.Department of Environment and Climate ChangeSydneyAustralia
  2. 2.School of Environmental and Life SciencesUniversity of NewcastleCallaghanAustralia
  3. 3.WolfvilleCanada

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