A morphodynamic model of reef-island development on atolls

Barry, S.J.; Cowell, Peter J.; Woodroffe, Colin D.

doi:10.1016/j.sedgeo.2006.08.006

Cited by 39 publications

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“…By contrast, coral mortality on fringing reefs around granitic islands in the Seychelles has been inferred to reduce their efficacy for shoreline protection, resulting in increased wave erosion of beaches (Sheppard et al, 2005). Although these viewpoints differ in terms of the immediate accretionary or erosional dynamics of reef islands, such studies indicate the significance of the response of the reef itself to sea-level change, and imply that there are critical thresholds in response of reef accretion to the rate of sea-level rise, beyond which abrupt change in both reef platform accretion and island deposition seems inevitable (Hopley 1997;Woodroffe, 2007).…”

Section: Accepted M Manuscriptmentioning

confidence: 99%

“…To parameterise simulations with high resolution digital terrain models and benthic surface cover maps enables the response of reef platforms to be modelled in a more deterministic or realistic manner than has been used in previous simulations of reef community dynamics (Blanchon and Blakeway, 2003;Langmead and Sheppard, 2004). Such an approach draws on available information to establish key boundary conditions for a platform configuration that is comparable to regional reef systems and could be further used to predict related patterns of island deposition or erosion in inverse or optimisation models that encompass the mobile portion of the carbonate budget, for example, sediment allocation models (Barry et al, 2007(Barry et al, , 2008. In this sense, the present study provides a useful starting point for future modelling exercises of the response of reef platforms to sea-level rise as data on rates of rise, carbonate production and elevation models of other reef platforms become available.…”

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Simulating reef response to sea-level rise at Lizard Island: A geospatial approach

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Please cite this article as: Hamylton, S.M., Leon, J.X., Saunders, M.I., Woodroffe, C.D., Simulating reef response to sea-level rise at Lizard Island: A geospatial approach, Geomorphology (2014Geomorphology ( ), doi: 10.1016Geomorphology ( /j.geomorph.2014 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting proof before it is published in its final form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain.A C C E P T E D M A N U S C R I P T Abstract Sea-level rise will result in changes in water depth over coral reefs, which will influence reef platform growth as a result of carbonate production and accretion. This study simulates the pattern of reef response on the reefs around Lizard Island in the northern Great Barrier Reef. Two sea-level rise scenarios are considered to capture the range of likely projections: 0.5 m and 1.2 m above 1990 levels by 2100. Reef topography has been established through extensive bathymetric profiling, together with available data, including LiDAR, single beam bathymetry, multibeam swath bathymetry, LADS and digitized chart data. The reef benthic cover around Lizard Island has been classified using a high resolution WorldView-2 satellite image, which is calibrated and validated against a ground referencing dataset of 364 underwater video records of the reef benthic character. Accretion rates are parameterised using published hydrochemical measurements taken in-situ and rules are applied using Boolean logic to incorporate geomorphological transitions associated with different depth ranges, such as recolonisation of the reef flat when it becomes inundated as sea level rises. Simulations indicate a variable platform response to the different sea-level rise scenarios. For the 0.5 m rise, the shallower reef flats are gradually colonised by corals, enabling this active geomorphological zone to keep up with the lower rate of rise while the other sand dominated areas get progressively deeper. In the 1.2 m scenario, a similar pattern is evident for the first 30 years of rise, beyond which the whole reef platform begins to slowly drown. To provide insight on reef response to sea-level rise in other areas, simulation results of four different reef settings are discussed and compared at the southeast reef flat (barrier reef), Coconut Beach (fringing reef), Watson's Bay (leeward bay with coral patches) and Mangrove Beach (sheltered lagoonal embayment). The reef sites appear to accrete upwards at a rate commensurate with the rate of rise, thereby maintaining their original profile and position relative to the sea surface and the leeward and lagoonal sites with a low accretion rate maintain a similar profile but slowly gain depth relative to sea-level. The result of this variable response i...

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Simulating reef response to sea-level rise at Lizard Island: A geospatial approach

et al. 2014

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“…tribuição nos mares tropicais atuais provém dos organismos fototróficos (corais hermatípicos, algas vermelhas e verdes) e não fototróficos (foraminíferos, moluscos, briozoários e equinodermos) (Barry et al 2007).…”

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Sedimentos carbonáticos bioclásticos do Atol das Rocas, Atlântico Sul Equatorial

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Kikuchi

2009

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Resumo Atóis são recifes que tanto geram quanto acumulam sedimentos carbonáticos. Os carbonatos bioclásticos do Atol das Rocas, Nordeste do Brasil, foram analisados a partir de amostras superficiais de diversos compartimentos ambientais. Os resultados mostram a predominância dos bioclastos de algas calcárias, foraminíferos e moluscos nos sedimentos revelando a dominância destes grupos na bioconstrução do recife e na dinâmica sedimentar da área. Evidências de contribuições alóctones e autóctones na composição sedimentoló-gica do atol e variações na composição ao longo do gradiente sotavento-barlavento são discutidas. Diferente de outros atóis do planeta, o Atol das Rocas apresenta as fácies lagunares com baixa proporção das fácies carbonáticas totais associadas ao recife e baixa frequência de bioclastos de corais escleractíneos. The results show the dominance of calcareous algae bioclasts, foraminiferans and molluscs in sediments of reef bioconstruction and the sediment dynamics of the area. Evidence of allochtonous and autochtonous contributions in the sedimentological composition of atoll and variations in the composition along the windward-leeward gradient are discussed. Unlike other atolls of the planet, the Rocas Atoll present the lagoonal facies with low proportion of total carbonate facies associated with the reef and low frequency of coral bioclasts. PalavrasKeywords: sedimentology, carbonates, Rocas Atoll, Equatorial South Atlantic. tribuição nos mares tropicais atuais provém dos organismos fototróficos (corais hermatípicos, algas vermelhas e verdes) e não fototróficos (foraminíferos, moluscos, briozoários e equinodermos) (Barry et al. 2007).No sistema siliciclástico o preenchimento é formado por diversas contribuições exógenas, enquanto no sistema carbonático os sedimentos são majoritariamente gerados in situ, dentro da própria bacia de sedimentação pela biota. Como conseqüência da contribuição biogêni-ca, fatores como latitude, temperatura, salinidade, profundidade da água, intensidade da luz, turbidez, circulação oceânica, pressão de CO 2 e suprimento sedimentar, atuam de forma conjunta, e criam condições necessárias para a proliferação dos organismos formadores da "fábri-ca carbonática" (Hanford & Loucks 1993). Sedimentologia e atóisPlataformas carbonáticas largas, plataformas isoladas e atóis são sistemas dinâmicos que tanto geram quanto acumulam sedimentos. Tais sistemas carbonáticos são influenciados significativamente por oscilações eustáticas e por controles batimétrico e de INTRODUÇÃO Recifes e sistemas carbonáticos Um recife biogênico é, segundo Lowenstam (1950), ".... o produto da atividade construtiva e agregadora/cimentadora de constituintes bióticos que, devido ao seu potencial de resistência às ondas, erigem estruturas topográficas resistentes a elas". Para Cloud (1959), qualquer recife, a qualquer tempo, é o resultado de sua cadeia de nutrientes e do produto de sua desintegração, e da sua história geológica. Stoddart (1969) acrescenta ainda a esses fatores a história geológica. Essa cons...

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“…Atolls are ring-shaped ocean reefs formed by an internal lagoon and islands of unconsolidated sediments (Barry et al, 2007;Woodroffe et al, 1999). These islands, commonly known as reef islands, are recent geological formations (Holocene), formed by physical processes acting on biogenic sediments (Gourlay, 1988).…”

Section: Introductionmentioning

confidence: 99%

“…Although atolls are superficially similar to each other, they significantly differ with regard to the number, size, continuity, and morphology of the reef islands (Barry et al, 2007). They typically have a low elevation (<3 m above the mean sea level), small area, vegetation in the central part, and narrow beaches around the entire perimeter (Kench and Brander, 2006a).…”

Section: Introductionmentioning

confidence: 99%

Wave and tidally induced processes on Rocas Atoll: geomorphological implications and future projections

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A morphodynamic model of reef-island development on atolls

Cited by 39 publications

References 26 publications

Simulating reef response to sea-level rise at Lizard Island: A geospatial approach

Simulating reef response to sea-level rise at Lizard Island: A geospatial approach

Sedimentos carbonáticos bioclásticos do Atol das Rocas, Atlântico Sul Equatorial

Wave and tidally induced processes on Rocas Atoll: geomorphological implications and future projections

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