Holocene stratigraphic and morphological evolution of the Wandandian Creek delta, St Georges Basin, New South Wales

Hopley, Carl A; Jones, Brian G.

doi:10.1080/08120090600880909

Cited by 10 publications

(24 citation statements)

References 10 publications

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“…The GIS analysis was supported by previous investigations of vegetation, sediment sampling, particle size, X-ray diffraction (XRD), loss on ignition (LOI) and water quality analyses [16]. This study divided the methodology into three parts, as seen in Figure 5.…”

Section: Methodsmentioning

confidence: 81%

“…The 1.6 m deep Wandandian Creek drains about 46% of St. Georges Basin catchment [20]. The deltaic system built by the Wandandian Creek sedimentary processes contains small areas of coastal wetlands (including mangrove, saltmarsh and back swamp) and intertidal flats on a fluvial bayhead delta [16]. …”

Section: The Study Site Specificationsmentioning

confidence: 99%

“…Average rainfall in the Wandandian catchment is 1300 mm/year leading to an estimated annual runoff of 400 mm [16,26]. [23].…”

Section: Local Climate Conditionsmentioning

confidence: 99%

“…Sediment and soil samples were collected as vibracores from the Wandandian Delta ( Figure 1) to represent all the recognized sedimentary facies [16]. Surface material was subsampled and analysed for grain size, mineralogy (using X-ray diffraction; XRD, Panalytical, Almelo, Holland) and organic matter (by loss on ignition; LOI, Ceramic Engineering, Sydney, Australia) to categorise each facies.…”

Section: Data Collectionmentioning

confidence: 99%

“…The coastal eco-geomorphic system of the Wandandian Delta is located at the end of Wandandian Creek where the channel is actively prograding into St. Georges Basin (Figure 1) that is separated from the South Pacific Ocean by a sandy barrier [14]. The shallow St. Georges Basin has rock outcrops that control where the Wandandian fluvial sediment can accumulate and build the deltaic system over time [15,16].…”

Section: The Study Site Specificationsmentioning

confidence: 99%

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A Spatio-Temporal Assessment of Landcover and Coastal Changes at Wandandian Delta System, Southeastern Australia

Al-Nasrawi

Hopley

Hamylton

et al. 2017

JMSE

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Large numbers of people live along and depend upon the world's coastal resources. Human modifications of the coastal zone, in combination with climate induced environmental changes, have had a major effect on the natural ecological systems. GIS analysis of remote sensed data, combined with fieldwork and laboratory tests, can be used to determine the resultant eco-geomorphic changes that need to be managed sustainably on a worldwide scale. Modelling the eco-geomorphic dynamics between 1949 and 2016 on the Wandandian Creek delta (southeastern NSW, Australia) provides a case study of management options for such coastal resources. Results from the Wandandian Creek delta show that sand/silt sediment derived from the partially (22%) modified terrestrial catchment has prograded into the wave-dominated St. Georges Basin where it is impacted by nearshore processes. Clear spatio-temporal growth of the areal extent and elevation of the deltaic levees and sandspits, with their associated mangroves and saltmarshes, has occurred over the past 65 years. Although the growth rate has fluctuated during the study period, due to flood events in 1974, 1990s and 2010, the overall subaerial and subaqueous delta area has had an average growth of 4168 m 2 annually with the shoreline extending 1.451 m/year on average. This geomorphic growth has stabilised the estuarine deltaic habitats with high proportions of nutrients and organic matter, particularly within saltmarsh, mangrove, Casuarina/Juncus and other mixed native plant areas. This research shows the importance of analysing morphological changes observed on the delta that can be related to both anthropogenic modifications and natural processes to the catchment and thus should be used in the development of catchment and coastal management plans.

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Section: Methodsmentioning

confidence: 81%

Section: The Study Site Specificationsmentioning

confidence: 99%

“…Average rainfall in the Wandandian catchment is 1300 mm/year leading to an estimated annual runoff of 400 mm [16,26]. [23].…”

Section: Local Climate Conditionsmentioning

confidence: 99%

Section: Data Collectionmentioning

confidence: 99%

Section: The Study Site Specificationsmentioning

confidence: 99%

See 3 more Smart Citations

A Spatio-Temporal Assessment of Landcover and Coastal Changes at Wandandian Delta System, Southeastern Australia

Al-Nasrawi

Hopley

Hamylton

et al. 2017

JMSE

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An assessment of anthropogenic and climatic stressors on estuaries using a spatio-temporal GIS-modelling approach for sustainability: Towamba estuary, southeastern Australia

Al-Nasrawi

Hamylton

Jones

2018

Environ Monit Assess

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Monitoring estuarine ecological-geomorphological dynamics has become a crucial aspect of studying the impacts of climate change and worldwide infrastructure development in coastal zones. Together, these factors have changed the natural eco-geomorphic processes that affect estuarine regimes and comprehensive modelling of coastal resources can assist managers to make appropriate decisions about their sustainable use. This study has utilised Towamba estuary (southeastern NSW, Australia), to demonstrate the value and priority of modelling estuarine dynamism as a measure of the rates and consequences of eco-geomorphic changes. This research employs several geoinformatic modelling approaches over time to investigate and assess how climate change and human activities have altered this estuarine eco-geomorphic setting. Multitemporal trend/change analysis of sediment delivery, shoreline positions and land cover, determined from fieldwork and GIS analysis of remote sensing datasets, shows significant spatio-temporal changes to the elevation and areal extent of sedimentary facies in the Towamba estuary over the past 65 years. Geomorphic growth (~ 2600 m annually) has stabilised the estuarine habitats, particularly within native vegetation, salt marsh and mangrove areas. Geomorphic changes have occurred because of a combination of sediment runoff from the mostly unmodified terrestrial catchment, nearshore processes (ocean dynamics) and human activities. The construction of GIS models, verified with water and sediment samples, can characterise physical processes and quantify changes within the estuarine ecosystem. Such robust models will allow resource managers to evaluate the potential effects of changes to the current coastal ecosystems.

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Contrasting sedimentation rates in Lake Illawarra and St Georges Basin, two large barrier estuaries on the southeast coast of Australia

et al. 2011

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Holocene stratigraphic and morphological evolution of the Wandandian Creek delta, St Georges Basin, New South Wales

Cited by 10 publications

References 10 publications

A Spatio-Temporal Assessment of Landcover and Coastal Changes at Wandandian Delta System, Southeastern Australia

A Spatio-Temporal Assessment of Landcover and Coastal Changes at Wandandian Delta System, Southeastern Australia

An assessment of anthropogenic and climatic stressors on estuaries using a spatio-temporal GIS-modelling approach for sustainability: Towamba estuary, southeastern Australia

Contrasting sedimentation rates in Lake Illawarra and St Georges Basin, two large barrier estuaries on the southeast coast of Australia

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