A morphological classification of coastal forelands, with examples from South Africa

Knight, Jasper; Burningham, Helene

doi:10.1016/j.geomorph.2022.108410

Cited by 6 publications

(2 citation statements)

References 66 publications

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“…This means that coastal sediment dynamics are founded on the interplay between sediment properties such as grain size, and hydrodynamic forcing factors that are, in this case, mainly climate driven [39]. Although coastal sediment cells can be considered as integrated and interconnected systems [35], in reality, the sediment volume fluxes and flux rates are highly variable between different storage areas within the system and respond to different forcing factors, such as wave-climate-controlling shoreface erosion and longshore transport [39,40] and wind-regime-controlling beach-dune sediment dynamics [41]. Understanding coastal sediment dynamics is the basis for modeling and predicting coastal change [22,[42][43][44][45].…”

Section: Coastal Systemsmentioning

confidence: 99%

The Green Infrastructure of Sandy Coastlines: A Nature-Based Solution for Mitigation of Climate Change Risks

Knight

2024

Sustainability

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Natural coastal landforms such as sand dunes and sandy beaches have been proposed as green infrastructure that can reduce climate change risks along coastlines. As such, they can offer a nature-based solution to rising sea levels, increased storminess and wave erosion associated with climate change. However, these proposed advantages are not always based on a sound understanding of coastal sediment system dynamics or tested against field evidence of coastal morphodynamic behavior. This study critically examines the basis of the claim for coastal landforms as green infrastructure, by considering how and in what ways these landforms provide resilience against ongoing climate change along sandy coasts, and proposes a theoretical framework for understanding this relationship. The analysis highlights that natural coastal landforms do not always have properties that provide resilience against future climate change. They can only be considered as offering nature-based solutions against climate change when their pre-existing morphodynamic behavior is fully understood. Thus, not all coastal landforms can be considered as ‘green infrastructure’ and the resilience offered by them against climate change forcing may vary from one place or context to another. This should be considered when using landforms such as sandy beaches and sand dunes as nature-based solutions for coastal management purposes. A 10-step framework is proposed, guiding coastal managers on how such green infrastructure can be used to mitigate climate change risks along coasts.

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Section: Coastal Systemsmentioning

confidence: 99%

The Green Infrastructure of Sandy Coastlines: A Nature-Based Solution for Mitigation of Climate Change Risks

Knight

2024

Sustainability

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“…As a result, many coastal protection structures, such as breakwaters and spurs, are being built in coastal areas (Dalton et al, 2008;Knight and Burningham, 2022;Smith et al, 2006;van Rijn, 2011). However, if the environmental conditions of the specific region are not considered, these structures can severely disrupt the delicate balance of the coastal morphology (Alhaddad et al, 2020;Ar Guner et al, 2011).…”

Section: Locationmentioning

confidence: 99%

An Integrated Bayesian Risk Model for Coastal Flow Slides using 3-D Hydrodynamic Transport and Monte Carlo Simulations

Durap¹,

Balas²,

Çokgör³

et al. 2023

Preprint

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Breaching and liquefaction are two types of coastal flow slides proposed in the literature. While their final results are similar, liquefaction and breaching failure are two different processes, with breaching failure characterized by a different progression and sand movement mechanisms. In densely packed sand, breaching causes delayed sand grain discharge and negative excess pore pressures. Liquefaction, when a mass of soil suddenly behaves like a liquid, flow out over overly gentle slopes. Flow slides typically go unnoticed until the slope fails above ground because they start below the water. Without modern technology, diving equipment, risk assessment, and probabilistic and sensitivity assessments, flow slides inherently challenging. The authors developed a new sensitivity index to detect the susceptibility of coastal flow slides. It was established a sophisticated hybrid model that accommodates flow slides in sync with unpredictable variables employed in this new sensitivity index. Innovative hybrid model has three distinctive models. The Hybrid Hydrodynamic Model addresses wave, wind, current, climate change, and sediment transfer. The Monte Carlo Simulation analyses sensitivity, and the Bayesian Network calculates joint probability of coastal flow slide parameters of this new index that includes environmental characteristics, including climate change. With the assistance of these three models, researchers aim at a) presenting a methodology for coupling coastal flow slide projections with outcomes; b) distinguishing two flow slides; c) examining variables influencing flow slides. The use of such a hybrid model and risk index offers a robust and computationally efficient approach to evaluating the critical angle slope for breaching failure.

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Vulnerability of geoheritage sites in South Africa to climate change: Examples from the Eastern Cape Province

Knight,

Grab

2024

Geomorphology

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A morphological classification of coastal forelands, with examples from South Africa

Cited by 6 publications

References 66 publications

The Green Infrastructure of Sandy Coastlines: A Nature-Based Solution for Mitigation of Climate Change Risks

The Green Infrastructure of Sandy Coastlines: A Nature-Based Solution for Mitigation of Climate Change Risks

An Integrated Bayesian Risk Model for Coastal Flow Slides using 3-D Hydrodynamic Transport and Monte Carlo Simulations

Vulnerability of geoheritage sites in South Africa to climate change: Examples from the Eastern Cape Province

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