All roads lead to retreat: adapting to sea level rise using a trigger-based pathway

Grace, Bill; Thompson, C.A.

doi:10.1080/07293682.2020.1775665

Cited by 6 publications

(2 citation statements)

References 23 publications

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“…By its nature, this tide‐only flooding is both more predictable and more frequent than flooding resulting from meteorological and oceanographic extremes. Therefore, once such flooding becomes sufficiently impactful, it likely elicits different adaptive responses (Grace & Thompson, 2020; Lawrence et al., 2020). However, different locations are at different stages in this transition.…”

Section: Discussion—the Need For Impact‐based Coastal Risk Assessment...mentioning

confidence: 99%

Australian Coastal Flooding Trends and Forcing Factors

et al. 2022

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Section: Discussion—the Need For Impact‐based Coastal Risk Assessment...mentioning

confidence: 99%

Australian Coastal Flooding Trends and Forcing Factors

et al. 2022

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“…Ware et al (2020) highlights that the cost related to the implementation of coastal protection varies significantly depending on the adopted representative concentration pathways (RCP - Pörtner et al, 2019). While relocation of coastal cities is challenging (Abel et al, 2011;Grace and Thompson, 2020), construction of structures such as groynes and seawalls that may help to stabilise the coastline tend to have a negative visual amenity impact and can potentially cause severe downdrift erosion (van Rijn, 2011). On the other hand, beach nourishment has the benefit of increased beach amenity (i.e.…”

Section: Introductionmentioning

confidence: 99%

Sediment pathways and morphodynamic response to a multi-purpose artificial reef – New insights

Silva

Hamilton

Strauss

et al. 2022

Coastal Engineering

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Multi-purpose Artificial Reefs (MPARs) are structures that may provide aesthetically acceptable coastal protection and improve recreational outcomes. Twenty years after construction of the first MPAR, Narrowneck reef on the Gold Coast of Australia, most of the available literature is still focused on the planning, design and construction of such structures and peer-reviewed publications on their post-construction monitoring, interaction with sediment transport and impacts on coastal morphology are lacking. The aim of this paper is to evaluate how does Narrowneck reef influence the sediment transport, and morphological changes around the anthropogenic structure, two decades after construction. To do so, a combination of ten high spatial resolution topo-bathymetric surveys from the top of the dune to the 10 m depth captured over 21 months and a series of 60 simulations using a calibrated numerical model were used. Our results demonstrate that: although not expected during design or reported in similar structures, sand can bypass the MPAR around its offshore end; under oblique waves, the longshore currents are deflected as they pass the reef, resulting in a shadow zone on the downdrift side where sand deposits; the bar crest tends to be higher on the reef's updrift side compared to downdrift, indicating that the MPAR can act as a store for sediments, as initially designed. Furthermore, the MPAR can act to stabilise the bar as it moves onshore with a downdrift offset of the inner bar as a result of low oblique wave incidence. The results presented here demonstrate that the short-term response to the MPAR twenty years after construction is more closely related to the deflection of longshore currents as they encounter the reef than to the dissipation of wave energy. This is because MPARs are designed to dissipate just enough wave energy so that they can achieve their recreational goal (surfing).

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