A methodological framework for reconstructing historical delta front morphology: case study at Macquarie rivulet delta within Lake Illawarra, Australia

Deng, Junjie; Yao, Qiangsheng; Jones, Brian G.; Rogers, Kerrylee; Woodroffe, Colin D.; Harff, Jan

doi:10.1007/s11852-019-00699-7

Cited by 2 publications

(5 citation statements)

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“…The apparent increase in sedimentation rate in MR 45 is likely to reflect land clearing and disturbance during urbanization within the catchment over the past 40 years. The increased sedimentation rates can also be inferred by the increased subaerial footprint of the delta since 1834, as published by Hopley et al (2007) and Deng et al (2019).…”

Section: And Simms and Rodriguezmentioning

confidence: 83%

“…(2007) and Deng et al . (2019). Significantly, the observed increase in sediment load resulted in the delta’s morphology transitioning from a wave‐dominated cuspate shape to the current birdsfoot morphology.…”

Section: Discussionmentioning

confidence: 99%

“…6. Delta progradation has been especially rapid in the last 200 years since European land clearing and settlement in the region has increased the fluvial sediment supply (Hopley et al ., 2007; Deng et al ., 2019).…”

Section: Discussionmentioning

confidence: 99%

“…Holocene evolution of wave‐dominated estuaries along the south‐east coast of Australia, including Lake Illawarra, has been researched and documented since the 1970s. Local examples of studies which address the development of fluvial bay‐head deltas, to varied degrees of detail, include the Macquarie Rivulet (Sloss et al ., 2004a; Hopley et al ., 2007; Deng et al ., 2019), Shoalhaven River system (Wright, 1970; Roy, 1984; Young et al ., 1996; Umitsu et al ., 2001), Wapengo Creek (Nichol, 1991), Wandandian Creek (Hopley & Jones, 2006) and Tomerong Creek (Sloss et al ., 2006a). Significantly, the lack of detail about the internal structure of bay‐head deltas impairs our ability to identify and manage these systems into the future as they adjust to climate change with increased anthropogenic pressure on the delta itself as well as the surrounding catchment.…”

Section: Introductionmentioning

confidence: 99%

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Holocene evolution and depositional model of a bayhead delta, Lake Illawarra, Australia

Hopley

Jones

2022

Sedimentology

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Extensive research into the evolution of wave-dominated estuaries has been documented since the 1960s. However, there has only been limited research on the prograding bay-head deltas that are the primary drivers for the rate and stage of estuary evolution. This paper presents the findings of a highresolution spatial study into the evolution of the Macquarie Rivulet bayhead delta in the Lake Illawarra barrier estuary. The delta's evolution has been established based on sedimentological analysis of 74 cores, two 14 C ages and 45 amino acid racemization ages. This study intersected two Pleistocene and 10 Holocene sedimentary facies associations representing both the retrogradational and progradational phases of delta development. The distribution of bayhead delta facies associations in shallow barrier estuaries is initially controlled by the antecedent morphology, but, in contrast to deeper estuaries, this influence decreases as sedimentation proceeds. Changing relative sea level also has a major control on facies distribution with transgressive facies deposited as relative sea-level rises being replaced by prograding deltaic facies during the highstand and subsequent minor relative sea-level fall. Fluvial sediment supply and river flood events affect the rate of delta progradation, and produce low and high flow sediment deposits within the overall deltaic sequence. The low tidal flux in barrier estuaries, the muddy cohesive nature of the sediments and the prevalence of bioturbation means that primary sedimentary structures are rarely preserved in these bayhead delta facies. The depositional model of bayhead delta evolution shown by the Macquarie Rivulet delta would be widely applicable to other similar barrier estuary settings.

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Section: And Simms and Rodriguezmentioning

confidence: 83%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Holocene evolution and depositional model of a bayhead delta, Lake Illawarra, Australia

Hopley

Jones

2022

Sedimentology

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“…Modeling and reconstruction of coastal landscapes' formation Deng et al (2019) developed a methodological framework to reconstruct the delta front morphology by integrating the information from historical shorelines, spatial distribution of depositional environments, relative sea-level changes and a modern Digital Elevation Model (DEM). A key process is the spatial connection between mud basin morphology, the subaerial DEM and the historical shoreline.…”

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confidence: 99%

Journal of Coastal Conservation special issue “Coast and society”

2019

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The coastal zone is the area where geosphere, hydrosphere, atmosphere, ecosphere and anthroposphere meet. Since prehistoric times the coast has provided people with habitat, food, trade ways, and facilitated socioeconomic networking. However, coasts are also recognized as areas that are threatened, where rising sea level, floods, storms, tsunamis, erosion and silting endanger livelihoods. These threats have become even more visible in recent times in the face of climate change and related oceanographic processes. Geologists, oceanographers, engineers, modelers and socio-economists met at the 35th International Geological Congress, Cape Town, South Africa in August 2016 and discussed at the symposium "Coast and Society" how natural processes and anthropogenic driving forces jointly shape the development of coastal zones and how the threats because of climate change and increasing exploitation of coastal zones resources can be mitigated. Some selected papers of the presentations from Cape Town 2016 have been brought together in this special issue in order to exemplify general principles at the interference of natural processes and human activities.

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A methodological framework for reconstructing historical delta front morphology: case study at Macquarie rivulet delta within Lake Illawarra, Australia

Cited by 2 publications

References 31 publications

Holocene evolution and depositional model of a bayhead delta, Lake Illawarra, Australia

Holocene evolution and depositional model of a bayhead delta, Lake Illawarra, Australia

Journal of Coastal Conservation special issue “Coast and society”

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