‘Coastal squeeze’ – an historical perspective

Doody, J. Pat

doi:10.1652/1400-0350(2004)010[0129:csahp]2.0.co;2

Cited by 237 publications

(129 citation statements)

References 4 publications

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“…Les modèles récents de prévision de l'augmentation du niveau marin à l'échelle mondiale montrent aussi que les côtes du Québec et de l'est du Canada font partie des régions où la hausse future du niveau marin sera parmi les plus élevées (Slangen et collab., 2012;Han et collab., 2015). À l'international, bien que quelques études sur le coincement côtier aient été réalisées sur des côtes sablonneuses (Schleupner, 2008) et sur des côtes rocheuses (Jackson et McIlvenny, 2011), la plupart ont porté sur les marais côtiers (Cooper et collab., 2001;Doody, 2004;Torio et Chmura, 2013). Au Québec, il n'existe encore aucun portrait d'ensemble de la répartition des écosystèmes côtiers de l'EGSL.…”

Section: Découvrir La Revueunclassified

Potentiel de migration des écosystèmes côtiers meubles québécois de l’estuaire et du golfe du Saint-Laurent dans le contexte de la hausse appréhendée du niveau de la mer

Bernatchez¹,

Quintin²

2016

natcan

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Les écosystèmes côtiers s’ajustent à la hausse du niveau de la mer en migrant vers les terres. Or, dans les zones sujettes à une accélération de la montée du niveau de la mer et à un déficit sédimentaire, des contraintes naturelles (p. ex. falaises) ou artificielles (p. ex. routes, structures de protection) présentes sur la côte, peuvent freiner cette dynamique naturelle et entraîner une perte de superficie de l’écosystème, processus nommé coincement côtier (coastal squeeze en anglais). Afin de savoir si les écosystèmes côtiers de l’estuaire et du golfe du Saint-Laurent (EGSL) ont l’espace nécessaire pour se déplacer vers les terres dans un contexte de hausse du niveau de la mer, leur distance de migration potentielle a été évaluée. Les résultats révèlent que 57 % des écosystèmes formés de sédiments meubles ont un potentiel de migration inférieur à 30 m. Les contraintes artificielles sont susceptibles de freiner leur déplacement dans plus de 50 % des cas et plus des 3/4 des contraintes artificielles sont situées à moins de 30 m de leur limite supérieure. L’impact du coincement côtier devient préoccupant tant pour les milieux sableux que pour les marais maritimes qui occupent, respectivement, 74 % et 26 % de la superficie du territoire. L’amorce d’une réflexion sur la conservation d’espaces de migration des écosystèmes côtiers de l’EGSL est essentielle afin d’augmenter leur résilience face aux changements environnementaux.

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Section: Découvrir La Revueunclassified

Potentiel de migration des écosystèmes côtiers meubles québécois de l’estuaire et du golfe du Saint-Laurent dans le contexte de la hausse appréhendée du niveau de la mer

Bernatchez¹,

Quintin²

2016

natcan

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“…Sea-level rise will lead to a redistribution (where possible) of intertidal and shallow coastal habitats, as well as increased seawater intrusion into estuaries and rivers (Short and Neckles 1999). However, development and modification of coastal habitats has introduced physical barriers to landward migration of wetlands along much of Australia's coastline (Lovelock and Ellison 2007), leading to contractions in habitat area (Doody 2004). The loss of tidal wetlands has significant ecological and geophysical impacts, including destabilisation of coastal shorelines and sediments, increased contamination and eutrophication of coastal ecosystems, leading to lower productivity.…”

Section: Fisheriesmentioning

confidence: 99%

Climate change and Australian marine and freshwater environments, fishes and fisheries: synthesis and options for adaptation

Koehn¹,

Hobday²,

Pratchett³

et al. 2011

Mar. Freshwater Res.

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Abstract. Anthropogenic climate change is already apparent and will have significant, ongoing impacts on Australian fishes and their habitats. Even with immediate actions to reduce greenhouse gases, there will be sustained environmental changes. Therefore, it is necessary to consider appropriate adaptations to minimise detrimental impacts for both fishes and the human populations that utilise them. Climate change will have a range of direct effects on the physiology, fitness, and survivorship of Australia's marine, estuarine and freshwater fishes, but also indirect effects via habitat degradation and changes to ecosystems. Effects will differ across populations, species and ecosystems, with some impacts being complex and causing unexpected outcomes. The range of adaptation options and necessary levels of intervention to maintain populations and ecosystem function will largely depend on the vulnerability of species and habitats. Climate change will also have an impact on people who depend on fishes for food or livelihoods; adapting to a new climate regime will mean trade-offs between biological assets and socioeconomic drivers. Models can be used to help predict trends and set priorities; however, they must be based on the best available science and data, and include fisheries, environmental, socioeconomic and political layers to support management actions for adaptation.

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“…These losses result from coastal squeeze caused by climate change and sea level rise, the construction of coastal defences, reduction in water and sediment quality, land reclamation for agriculture, industry and recreational use, and coastal development through the construction and expansion of ports and marinas (e.g. Doody, 2004;Jacobs et al, 2009;Kennish, 2002).…”

Section: Introductionmentioning

confidence: 99%

Sedimentation rhythms and hydrodynamics in two engineered environments in an open coast managed realignment site

2017

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Managed Realignment (MR) schemes are considered by many coastal managers and engineers to be a preferable method of coastal flood defence and compensating for habitat loss, by creating new areas of intertidal saltmarsh and mudflat habitat. Monitoring of MR sites has tended to focus on short term ecological factors, resulting in a shortage of high frequency, high resolution long term measurements of the evolution of the sediment erosion, transportation, deposition and consolidation cycle (ETDC) in newly breached sites. This is particularly true of analysis of the formation and preservation of sedimentary rhythmites and evaluations of sedimentation rates (and their variability) in newly inundated intertidal environments. This study provides an evaluation of sedimentation rhythms and hydrodynamics from two contrasting sites within the Medmerry Managed Realignment scheme, the largest open coast realignment in Europe (at the time of site inundation). Bed sediment altimeter data highlighted different sedimentation patterns at the two sites; near constant deposition of sediment occurred near the breach resulting in 15.2 cm of sediment being accreted over the one year monitoring period, whereas periodic accretion and erosion of sediment occurred inland leading to 2.7 cm of net accretion. Differences in the relationship between suspended sediment concentrations and site hydrodynamics were observed on a semi-diurnal to annual scale. This study highlights the need for further consideration of the sedimentation processes in MR schemes in order to enhance the design and construction of these sites. Advancements in the understanding of these processes will increase the success of MR schemes in terms of the evolution of the sediment regime and the ecosystem services provided, particularly as they are more widely accepted as a form of coastal flood defence and intertidal habitat creation method.

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‘Coastal squeeze’ – an historical perspective

Cited by 237 publications

References 4 publications

Potentiel de migration des écosystèmes côtiers meubles québécois de l’estuaire et du golfe du Saint-Laurent dans le contexte de la hausse appréhendée du niveau de la mer

Potentiel de migration des écosystèmes côtiers meubles québécois de l’estuaire et du golfe du Saint-Laurent dans le contexte de la hausse appréhendée du niveau de la mer

Climate change and Australian marine and freshwater environments, fishes and fisheries: synthesis and options for adaptation

Sedimentation rhythms and hydrodynamics in two engineered environments in an open coast managed realignment site

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