Colin WOODROFFE - Research Information

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Morphodynamics of estuaries and deltas

Colin Woodroffe has examined the sedimentary history of estuaries and deltas in three regions.

 Southeastern Australia
 Northern Australia
 Southeast Asia

Estuaries of southeastern Australia

The estuaries of southeastern Australia are a research focus of the GeoQuEST Research Centre. Colin Woodroffe is part of a team of researchers examining the processes by which coastal lakes and barrier estuaries infill. His particular focus has been on the stratigraphy of mature infilled barrier estuaries such as the Shoalhaven River delta (Woodroffe et al., 2000, Umitsu et al., 2001), and the Minnamurra River plains (Panayotou et al., 2007; Haslett et al., 2010).  He, together with Kerrylee Rogers, has supervised an Honours project by Tom Oliver that has studied mangrove and saltmarsh dynamics and sedimentation in the Minnamurra estuary, and modelled its future response to sea-level rise.

References

Umitsu, M., Buman, M., Kawase, K. and Woodroffe, C.D. (2001) Holocene palaeoecology and formation of the Shoalhaven River deltaic-estuarine plains, southeast Australia. The Holocene 11, 407-418.

Woodroffe, C.D., Buman, M., Kawase, K. and Umitsu, M. (2000) Estuarine infill and formation of deltaic plains, Shoalhaven River. Wetlands 18, 72-84.

Panayaotou, K., Woodroffe, C.D., Jones, B.G., Chennall, B., McLean, E. and Heijnis, H. (2007) Patterns and rates of sedimentary infill in the Minnamurra River Estuary, southeastern Australia. Journal of Coastal Research, Special Issue,50, 688-692.

Haslett, S.K., Davies-Burrows, R., Panayotou, K., Jones, B.G. and Woodroffe, C.D. (2010) Holocene evolution of the Minnamurra River estuary, southeast Australia: foraminiferal evidence. Zeitschrift für Geomorphologie, 54, Suppl. 3, 79-98.

Estuaries of northern Australia

Colin Woodroffe’s research in northern Australia has led to the development of a three-stage model of estuarine evolution based on the coring, stratigraphy and dating results from the South Alligator River, but with supporting evidence from other adjacent river systems (Woodroffe et al., 1993). The initial stage, commencing around 8000 years ago, was a transgressive stage during which the valleys were flooded as sea level continued to rise. The second stage during the mid-Holocene, termed a big swamp phase, was characterised by widespread mangrove forests occupying much of what is now estuarine plain. This phase peaked around 6000 years ago, when sea level stabilised at or close to its present level. This stage was superceded by the final stage during which the estuary became channelised as vertical sedimentation continued to infill the estuary, and mangroves were replaced by sedge/grassland.

A particular area of interest in these northern Australian systems is the rapid recent expansion of several of the tidal system, particularly that on the Mary River. Extensive areas of the low-lying plains have undergone saline intrusion, and this appears to be an analogue of the way in which low-lying plains elsewhere might be inundated under conditions of sea-level rise as anticipated as a result of climate change (Mulrennan and Woodroffe, 1998). These systems are the focus of research by PhD student Gareth Davies.

References

Woodroffe, C.D., Mulrennan, M.E. and Chappell, J. (1993) Estuarine infill and coastal progradation, southern van Diemen Gulf, northern Australia. Sedimentary Geology 83, 257-275.

Mulrennan, M.E. and Woodroffe, C.D. (1998) Saltwater intrusion into coastal plains of the Lower Mary River, Northern Territory, Australia. Journal of Environmental Management 54. 169-188.

Davies, G. and Woodroffe, C.D. (2010) Tidal estuary width convergence: theory and form in North Australian estuaries. Earth Surface Processes and Landforms, 35, 737-749.

Southeast Asia

The pattern of development of estuaries identified in northern Australia, with a change from transgression to regression, has been identified throughout much of the southeast Asian region, although many of the larger deltaic systems have filled in more rapidly and their shoreline may have prograded more extensively (Woodroffe, 2000). Colin is interested in developing the approaches adopted in northern Australia and extending them to the delta systems of southeast Asia (Woodroffe, et al., 2006).

References

Woodroffe, C.D. (2000) Deltaic and estuarine environments and their Late Quaternary dynamics on the Sunda and Sahul shelves. Journal of Asian Earth Sciences 18, 393-413.

Woodroffe, C.D., Nicholls, R.J., Saito, Y., Chen, Z. and Goodred, S.L. (2006) Landscape variability and the response of Asian megadeltas to environmental change, In Harvey, N. (ed) Global Change and Integrated Coastal Management: The Asia-Pacific Region, Springer, pp. 277-314.

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