Palaeo-Environmental Approaches to Reconstructing Sea Level Changes in Estuaries

Morrison, Brigid; Ellison, JC

doi:10.1007/978-94-024-0990-1_19

Cited by 4 publications

(4 citation statements)

References 55 publications

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“…Glacio-isostatic adjustment (GIA) modelling by Lambeck and Nakada (1990) implied no highstand in Tasmania noting the potential influence of Late Pleistocene uplift also suggested by Murray-Wallace & Goede (1991;1995). This interpretation appears to be the prevailing view (Lambeck, 2002), and recent proxy reconstructions have favoured a sea level that remained below present level in mid Holocene but rose gradually to its present level (Gehrels et al, 2012;Morrison & Ellison, 2017). Clark et al (2011) also concluded that the sea level was below present around 7000 years ago, but they did infer a fall in sea-level during the late Holocene to explain the decreasing marine influence observed in three coastal wetlands.…”

Section: Mid To Late Holocene Sea Level In Tasmaniamentioning

confidence: 95%

Reply to: Punctuated transgression (?): Comment on Oliver, T.S.N., Donaldson, P., Sharples, C., Roach, M., and Woodroffe, C.D. “Punctuated progradation of the Seven Mile Beach Holocene barrier system, southeastern Tasmania”

Oliver

Donaldson²,

Roach

et al. 2018

Marine Geology

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Our interpretation of the depositional history of the prograded barrier at Seven Mile Beach in Tasmania, described in Oliver et al. (2017a), was based on the morphology of ridges apparent in the LiDAR-based digital elevation data and a sample of 14 optically-stimulated luminescence (OSL) ages. Dougherty (2018) has identified gaps in the chronology and speculated that progradation may have occurred as sea level fell from a mid-Holocene highstand inappropriately applying sea-level curves from mainland Australia. Despite a highstand being inferred by early research in Tasmania, glacio-isostatic modelling and recent sea-level studies adopted a prevailing view that excluded a highstand. Our observations led us to question this prevailing view and to suggest that it might be appropriate to reopen the debate on Holocene sea-level change in Tasmania. We welcome the renewed interest in the chronology and sea-level history of this prograded barrier, and look forward to further clarification based on new evidence. The site may have the potential to become one of the more continuous and better-constrained sea-level records in southern Australia.

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Section: Mid To Late Holocene Sea Level In Tasmaniamentioning

confidence: 95%

Reply to: Punctuated transgression (?): Comment on Oliver, T.S.N., Donaldson, P., Sharples, C., Roach, M., and Woodroffe, C.D. “Punctuated progradation of the Seven Mile Beach Holocene barrier system, southeastern Tasmania”

Oliver

Donaldson²,

Roach

et al. 2018

Marine Geology

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“…Climate change involves distinct biochemical and mechanical processes that occur within and above the oceanic and continental crust [1][2][3][4][5][6]. One of the most noticeable effects of climatic variations and coastal margin modeling in this study is the rise and fall of sea levels during the Quaternary period [7][8][9][10]. All these effects of changes, which occurred in the past, are recorded in the sediments and in the shaping of the terrain, depending on sedimentary inputs or erosional processes, as well as glacial and interglacial stages, which are defined as Marine Isotope Stage (MIS), as well as intense precipitation or erosion by the sea, river, and wind [2,[11][12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 93%

New Perspectives on the Quaternary Paleogeography of Coastal Ecuador and Its Relationships with Climate Change

Quiñónez-Macías,

Chunga,

Toulkeridis

et al. 2023

Quaternary

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Well-preserved Quaternary sedimentary sequences in the central coast of Ecuador have provided sufficient relevant information for paleogeographic reconstruction and climatic evolution, from stratigraphic, geochemical, and biological analysis. The Jaramijo canton site is one of the most remarkable results in the stratigraphic correlation of lithological units with delineation of a paleo sea-cliff of age 14C 43,245 ± 460 B.P. (belonging to the MIS-3). This MIS-3 is associated with a period of glaciation, but the data obtained, such as δ 18O, indicate paleo-temperature values of −1 to −1.5, which are interpreted in this study, indicate that the central coast of Ecuador has an interstadial phase (warm years in a glacial stage). Two more paleo-coastal cliffs have been mapped from orthophoto analysis, but these are younger. The sedimentary levels analyzed in this study include deposits that occurred in MIS 3 to MIS 1. Holocene transgression has modified the central coast of Ecuador and increased the level of coastal climate hazard by sea level rise. Indeed, paleo-coastlines have been evidenced from bathymetric data in the depth contours of −5.5 m and −7.6 m, at 440 and 650 m distances from the up-to-date coastline. For the Jaramijó site, the rate of cliff-erosion and wave-cut platforms are in the order of 1.1 to 2.4 m/yr. These cliff-erosion rates, with a moderate to high coastal vulnerability index, can be increased if we consider mathematical models with an estimated sea-level rise scenario to be, in 2100, about +1 to +1.4 m.

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“…Glacial periods beginning 2.4 Ma brought no glacial activity but caused sea level fluctuation, up to 20 m above and 130 m below current levels (Corbett, 2019). Base level changes are summarised in Table S1, in south-eastern Tasmania rapid rising sea level occurred from $130 m below present levels until 7,000 BP (years before present) then slowed from 20 m upwards to become a very slow after 2,500 BP (Morrison & Ellison, 2017). Planimetric areas of sub-catchments, topographic areas and area ratios were derived (Supporting Information Figure S1).…”

Section: Study Areamentioning

confidence: 99%

Lithological controls influence river form in contrasting sub‐catchments: The Scamander and Avenue Rivers, Tasmania

Fearman

Ellison

2023

River Research & Apps

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Bedrock influence on river channel form is difficult to assess, with many catchments dominated by glacial erosion and with blanketing sediments from both pluvial and fluvial sources. The Scamander catchment in Tasmania lacks glacial history and features two bedrock-confined sub-catchments of similar area and maximum flow length, but one dominated by Mathinna Group sedimentary rocks, and the other with large areas in granite lithology. Lithology types, stream network parameters and near stream slope angles were analysed using geographical information systems, and results of stream cross sections, channel form and planforms were compared for each lithology. Results showed that granite features low gradient, shallow streams with channel slope cross sections of <10 . Granite channels are irregular and dominated by large boulders that create channel roughness and resist incision. Weathering products of coarse quartz sand provide anchorages for in-channel vegetation. By contrast, sedimentary Mathinna Group rocks feature steeply incised trough-like channels, with near-channel hillslope gradients mostly between 30 and 50 . Rectangular blocks disintegrate to gravel cobbles on the channel bed, providing poor anchorage for vegetation. Mathinna lithology influences steep, low roughness channels, and stable, incised recurved meanders formed by river interaction with vertical layers of resistant rock.The resistant bedrock lithology is demonstrated in this study to influence varied river planforms, near-channel slope gradients, channel sediments and cross sections.bedrock rivers, Mathinna Group rocks, river catchment, river channel, river geomorphology, river planform, Strahler stream order | INTRODUCTIONBedrock rivers are an outstanding feature within geodiversity, where river channels feature exposed rock with little sediment (Gomez-Heras et al., 2019). Lithological controls set the boundary conditions in which rivers operate, providing the resisting framework on which exogenic processes influence river character and behaviour (Brierley, 2010;Schumm, 1977;Wohl & Ikeda, 1997). Tectonic uplift, climate change and base level fall can increase the transporting power of water relative to the available sediment supply, causing incision into the channel bed (Simon & Rinaldi, 2006;Wohl & Ikeda, 1998;Yanites, 2018). River erosion patterns are strongly influenced by bedrock (Wohl & Ikeda, 1998), also influencing river response to tectonic forcing (Shobe et al., 2021).

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Palaeo-Environmental Approaches to Reconstructing Sea Level Changes in Estuaries

Cited by 4 publications

References 55 publications

Reply to: Punctuated transgression (?): Comment on Oliver, T.S.N., Donaldson, P., Sharples, C., Roach, M., and Woodroffe, C.D. “Punctuated progradation of the Seven Mile Beach Holocene barrier system, southeastern Tasmania”

Reply to: Punctuated transgression (?): Comment on Oliver, T.S.N., Donaldson, P., Sharples, C., Roach, M., and Woodroffe, C.D. “Punctuated progradation of the Seven Mile Beach Holocene barrier system, southeastern Tasmania”

New Perspectives on the Quaternary Paleogeography of Coastal Ecuador and Its Relationships with Climate Change

Lithological controls influence river form in contrasting sub‐catchments: The Scamander and Avenue Rivers, Tasmania

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