Abstract
This study was undertaken to describe the characteristics of suspended sediment concentrations (SSCs) of marine waters near inner-shelf fringing coral reefs and relate these to the prevailing oceanographic and meteorological conditions. Using logging optical backscatter nephelometers, SSCs were measured at fringing reefs at Magnetic Island and on the adjacent inner-shelf, Cleveland Bay, N.E. Australia. Continuous measure-ments were made over a period of 4 months, representing possibly the most comprehensive set of SSC data collected near coral reefs. Wind, current and wave data were also collected. Temporal and spatial variation in near-bed SSCs is high. Periods of strong southeasterly regional winds generate swells, which, within 1 km of the reefs, produce near-bed SSCs of well over 200 mg/l. At the fringing coral reefs at Arthur and Geoffrey Bays, SSCs were less than 5 mg/l for most of the time and rarely exceeded 40 mg/l, but there were a number of periods of over 24 h when near-bed SSCs continuously exceeded 20 mg/l. The height of locally produced, short-period wind-waves is the dominant control on the magnitude of near-bed SSCs at the reef sites, and thus the wind regime heavily influences conditions for coral communities. The magnitude of the tide is of lesser importance. However, it is likely that flushing of these bays by tidal currents is important in preventing a long-term build-up of SSC in the water around the coral reefs.
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References
Bak RM (1978) Lethal and sublethal effects of dredging on corals. Mar Pollut Bull 9:14–16
Baker ET, Lavelle JW (1984) The effect of particle size on the light attenuation coefficient of natural suspensions. J Geophys Res 89: 8197–8203
Beaman R, Larcombe P, Carter RM (1994) New evidence for the Holocene sea-level high from the inner shelf, central Great Barrier Reef shelf, Australia. J Sediment Res A 64:881–885
Belperio AP (1978) An inner shelf sedimentation model for the Townsville region, Great Barrier Reef province. PhD thesis, James Cook University, Townsville
Bull GD (1982) Scleractinian coral communities of two inshore high island fringing reefs at Magnetic Island, north Queensland. Mar Ecol Prog Ser 7:267–272
Carter RM, Johnson DP, Hooper KG (1993) Episodic post-glacial sea-level rise and the sedimentary evolution of a tropical embayment (Cleveland Bay, Great Barrier Reef shelf, Australia). Aust J Earth Sci 40:229–255
Chappell J, Chivas A, Wallensky E, Polach HA, Aharon P (1983) Holocene palaeo-environmental changes, central to north Great Barrier Reef inner zone. BMR J Aust Geol Geophys 8:223–235
Conner CS, De Visser AM (1992) A laboratory investigation of particle size effects on an optical backscatterance sensor. Mar Geol 108:151–159
Dodge RE, Vaisnys JR (1977) Coral populations and growth patterns: responses to dredging and turbidity associated with dredging. J Mar Res 35:715–730
Fennessy MJ, Dyer KR, Huntley DA (1994) INSSEV: an instrument to measure the size and settling velocity of flocs in situ. Mar Geol 117:107–117
Gibbs RJ, Wolanski E (1992) The effect of flocs on optical back-scattering measurements of suspended material concentration. Mar Geol 107:289–291
Green MO, Boon JD (1993) The measurement of constituent concentrations in non-homogeneous sediment suspensions using optical backscatter sensors. Mar Geol 110:73–81
Harris PT, Davies PJ, Marshall JF (1990) Late Quaternary sedimentation on the Great Barrier Reef continental shelf and slope east of Townsville, Australia. Mar Geol 94:55–77
Hopley D (1983) Evidence of 15000 years of sea-level change in tropical Queensland. In: Hopley D (ed) Australian sea-levels in the last 15000 years: a review. (Monograph series, occasional paper no 3) Department of Geography, James Cook University of North Queensland, Townsville, pp 93–104
Hopley D, Choat HC (1990) The effects of mainland land use on adjacent reef systems of the Great Barrier Reef. Paper presented at Australian Institute of Agricultural Science, North Queensland Sub-branch Symposium: Agriculture and the Ecosystem in North Queensland
Lineke GC, Sternberg RW (1992) Measurements of high concentration suspended sediments using the optical backscatterance sensor. Mar Geol 108:253–258
Ling B, Wolanski E (1992) Coastal dynamics along a rugged coastline. In: Prandle D (ed) Dynamics and exchanges in estuaries and the coastal zone. (Coastal and estuarine studies) American Geophysical Union, New York, pp 577–598
Larcombe P, Ridd PV (1994) Data interpretation. In: Benson LJ, Goldsworthy PM, Butler IR, Oliver J (eds) Townsville Port Authority Capital Dredging Works 1993: Environmental Monitoring Program. Townsville Port Authority, Townsville, pp 165–194
Larcombe P, Carter RM, Dye J, Gagan MK, Johnson DP (1995) New evidence for episodic postglacial sea-level rise, central Great Barrier Reef, Australia. Mar Geol (in press)
Mapstone BD, Choat JH, Cumming RL, Oxley WG (1989) The fringing reefs of Magnetic Island: benthic biota and sedimentation — a baseline study. (Research publication no. 13) Great Barrier Reef Marine Park Authority, Townsville
Ohlenbusch R (1991) Post-glacial sequence stratigraphy and sedimentary development of the continental shelf off Townsville, central Great Barrier Reef province. Honours thesis, James Cook University, Townsville
Parnell KE (1988) The hydrodynamics of fringing reef bays in the Great Barrier Reef Marine Park. Proc 6th Int Coral Reef Symp Aust 2:503–508
Patterson D (1994) Oceanographic data collection. In: Benson LJ, Goldsworthy PM, Butler IR, Oliver J (eds) Townsville Port Authority Capital Dredging Works 1993: Environmental Monitoring Program. Townsville Port Authority, Townsville, pp 125–147
Ridd PV, Larcombe P (1994) Biofouling control for optical backscatter suspended sediment sensors. Mar Geol 116:255–258
Rogers CS (1990) Responses of coral reefs and reef organisms to sedimentation. Mar Ecol Prog Ser 62:185–202
Smith A (1978) Case study: Magnetic Island and its fringing reefs. In: Hopley D (ed) Geographical studies of the Townsville area. (Monograph series, occasional paper no. 2) Department of Geography, James Cook University, Townsville, pp 59–64
Tye SC (1992) A stratigraphic and geochemical study of the Holocene sediments in southern Halifax Bay, North Queensland. Honours thesis, Geology Department, James Cook University, Townsville
West BG, Davies PJ (1981) Determination of suspended sediment loads, southern Great Barrier Reef: field techniques. BMR J Aust Geol Geophys 6:181–185
Wolanski E, Ridd PV (1990) Mixing and trapping in Australian tropical coastal waters. In: Cheng RT (ed) Residual currents and long term transport. (Coastal and estuarine studies, vol 38) Springer, New York Berlin Heidelberg, pp 165–183
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Larcombe, P., Ridd, P.V., Prytz, A. et al. Factors controlling suspended sediment on inner-shelf coral reefs, Townsville, Australia. Coral Reefs 14, 163–171 (1995). https://doi.org/10.1007/BF00367235
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DOI: https://doi.org/10.1007/BF00367235