An integrated physical and cost-benefit approach to assess groins as a coastal erosion mitigation strategy

Lima, M.; Coelho, Carlos; Gomes, Fernando Veloso; Roebeling, Peter

doi:10.1016/j.coastaleng.2019.103614

Cited by 31 publications

(25 citation statements)

References 36 publications

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“…With respect to groins, trapping capacity reduces with time, until sediments bypass the obstacle; at this point, offshore dispersion is increased, although some material can overpass the structure (if it does not extend over the depth of closure). Therefore, updrift accumulation, offshore dispersion and input to the downdrift sectors change over time [119,120].…”

Section: Coastal Structuresmentioning

confidence: 99%

The Equilibrium Concept, or…(Mis)concept in Beaches

Pranzini

Williams

2021

Geosciences

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Beaches, as deposits of unconsolidated material at the land/water interface, are open systems where input and output items constitute the sediment budget. Beach evolution depends on the difference between the input/output to the system; if positive the beach advances, if negative the beach retreats. Is it possible that this difference is zero and the beach is stable? The various processes responsible for sediment input and output in any beach system are here considered by taking examples from the literature. Results show that this can involve movement of a volume of sediments ranging from few, to over a million cubic meters per year, with figures continuously changing so that the statistical possibility for the budget being equal can be considered zero. This can be attributed to the fact that very few processes are feedback-regulated, which is the only possibility for a natural system to be in equilibrium. Usage of the term “beach equilibrium” must be reconsidered and used with great caution.

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Section: Coastal Structuresmentioning

confidence: 99%

The Equilibrium Concept, or…(Mis)concept in Beaches

Pranzini

Williams

2021

Geosciences

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“…Some generic applications of COAST were presented by [72,116,117], considering hypothetical values to discuss different scenarios of interventions to mitigate coastal erosion. At the present, COAST is being considered in a real situation to evaluate costs and benefits of sand by-passing systems in two harbors of the Portuguese Northwest coast, and to discuss coastal erosion mitigation strategies at the Ovar municipality (Portuguese Northwest coast), in the aim of the INCCA (Integrated Coastal Climate Change Adaptation for Resilient Communities) project, started in February 2020.…”

Section: Figurementioning

confidence: 99%

Coastal Management Software to Support the Decision-Makers to Mitigate Coastal Erosion

Coelho

Narra

Marinho

et al. 2020

JMSE

Self Cite

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There are no sequential and integrated approaches that include the steps needed to perform an adequate management and planning of the coastal zones to mitigate coastal erosion problems and climate change effects. Important numerical model packs are available for users, but often looking deeply to the physical processes, demanding big computational efforts and focusing on specific problems. Thus, it is important to provide adequate tools to the decision-makers, which can be easily interpreted by populations, promoting discussions of optimal intervention scenarios in medium to long-term horizons. COMASO (coastal management software) intends to fill this gap, presenting a group of tools that can be applied in standalone mode, or in a sequential order. The first tool should map the coastal erosion vulnerability and risk, also including the climate change effects, defining a hierarchy of priorities where coastal defense interventions should be performed, or limiting/constraining some land uses or activities. In the locations identified as priorities, a more detailed analysis should consider the application of shoreline and cross-shore evolution models (second tool), allowing discussing intervention scenarios, in medium to long-term horizons. After the defined scenarios, the design of the intervention should be discussed, both in case of being a hard coastal structure or an artificial nourishment (third type of tools). Finally, a cost-benefit assessment tool should optimize the decisions, forecasting costs and benefits for each different scenario, through definition of economic values to the interventions and to the land/services/ecosystems, weighting all the environmental, cultural, social and historical aspects. It is considered that COMASO tools can help giving answers to the major problems of the coastal planning and management entities, integrating transversal knowledge in risk assessment, physical processes, engineering and economic evaluations. The integrated coastal zone management needs these tools to ensure sustainable coastal zones, mitigating erosion and climate change effects.

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“…The value of services such as storm protection or erosion control provided by salt marshes and mangroves worldwide is estimated to be 194,000 $/ha/year [51], which has not been accounted for in this study. Of course, one should acknowledge that other important factors such as shoreline evolution have to be integrated into a cost-benefit analysis to account for the complexities of coastal defence solutions, as argued earlier by other authors [52]. In this case, we have simplified this part of the analysis to focus on the impact of uncertainty on the economic estimates but by no means do we neglect the need to integrate those factors.…”

Section: The Economic Damage Of Sea-level Risementioning

confidence: 99%

The Costs of Sea-Level Rise: Coastal Adaptation Investments vs. Inaction in Iberian Coastal Cities

Abadie

Murieta

Galarraga

2020

Water

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Iberian coastal cities are subject to significant risks in the next decades due to climate change-induced sea-level rise. These risks are quite uncertain depending on several factors. In this article, we estimate potential economic damage in 62 Iberian coastal cities from 2020 to 2100 using regional relative sea-level rise data under three representative concentration pathways (RCP 8.5, RCP 4.5 and RCP 2.6). We analyze the expected accumulated damage costs if no adaptation actions take place and compare this scenario to the investment cost of some adaptation strategies being implemented. The results show that some adaptation strategies are less costly than the potential damage under inaction. In other words, it is economically rational to invest in adaptation even in a context of high uncertainty. These calculations are very relevant to inform climate change adaptation decisions and to better manage the risk posed by sea-level rise. Moreover, our findings show the importance of a good understanding of the shape of the sea-level rise and damage cost distributions to calculate the expected damage. We show that using the 50th percentile for these calculations is not adequate as it leads to a serious underestimation of expected damage and coastal risk.

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An integrated physical and cost-benefit approach to assess groins as a coastal erosion mitigation strategy

Cited by 31 publications

References 36 publications

The Equilibrium Concept, or…(Mis)concept in Beaches

The Equilibrium Concept, or…(Mis)concept in Beaches

Coastal Management Software to Support the Decision-Makers to Mitigate Coastal Erosion

The Costs of Sea-Level Rise: Coastal Adaptation Investments vs. Inaction in Iberian Coastal Cities

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