Influence of hard defence structures on shoreline erosion along Molise coast (southern Italy): a preliminary investigation

Paola, Gianluigi Di; Ciccaglione, Margherita Carmen; Buccino, Mariano; Rosskopf, Carmen Maria

doi:10.3301/rol.2020.10

Cited by 4 publications

(9 citation statements)

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“…Additionally, it is important to point out that, even though the equivalent wave concept is widely used in the field of practical coastal engineering, it lacks a firm theoretical basis. However, recent studies carried out by [39], demonstrated, through qualitative and quantitative analysis, how the equivalent wave concept may be reliable in explaining the long-term evolution of a stretch of coast. In light of this, the LDR for the case study area has been derived and the equivalent wave has been estimated and used as the wave attack that governs the plan-shape of the bay.…”

Section: Ldr and Equivalent Wavementioning

confidence: 99%

“…The equivalent direction corresponds to the null-point of the real LDR (205 • N for the present case), while H s,eq and T p,eq are fitted to have the same littoral transport magnitude, obtaining H s,eq = 0.8 m and T p,eq =5.89 s (Equation (18)). Additionally, it is worth noticing that, as explained by [39], in [37] the authors do not define explicitly how to derive the equivalent wave height and period. While the equivalent wave direction is much easier to interpret, as it corresponds to the null point of the LDR, the same is not true for H s,eq , and T eq .…”

Section: Ldr and Equivalent Wavementioning

confidence: 99%

“…Therefore, when in narrow wave sector, as the present case of Bagnoli bay, we are used to observe mono-modal wave climate, so with a single high-frequency direction. In such conditions, the directional mode corresponds to the average one, which corresponds, in turn, to the LDR equivalent wave direction [39].…”

Section: Ldr and Equivalent Wavementioning

confidence: 99%

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Predicting Crenulate Bay Profiles from Wave Fronts: Numerical Experiments and Empirical Formulae

Buccino¹,

Tuozzo²,

Ciccaglione³

et al. 2021

Geosciences

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For crenulate-shaped bays, the coastal outline assumes a specific shape related to the predominant waves in the area: it generally consists of a tangential zone downcoast and a curved portion upcoast. Many coastal engineers have attempted to derive an expression of the headland bay shapes that emerge when a full equilibrium is reached (stable or dynamic). However, even though models for static equilibrium bays exist, they are merely of an empirical kind, lacking further insight on relationships between incident wave characteristics and beach shape. In addition, it is commonly believed that shoreline profiles tend to follow wave fronts, but this has been never fully verified. In this paper, we investigate a possible correlation between static equilibrium profiles and wave front shapes. Numerical experiments have been performed using the MIKE 21 Boussinesq Wave module, and the generated wave fronts have been compared to the hyperbolic-tangent equilibrium profile. A thoughtful analysis of results revealed that a single-headland equilibrium profile is merely the wave front translated perpendicularly to the wave direction at the headland tip, without any influence of wave period or in wave direction. A new function called the “wave-front-bay-shape equation” has been obtained, and the application and validation of this formula to the case-study bay of the Bagnoli coast (south-west of Italy) is described in the paper.

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Section: Ldr and Equivalent Wavementioning

confidence: 99%

Section: Ldr and Equivalent Wavementioning

confidence: 99%

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Predicting Crenulate Bay Profiles from Wave Fronts: Numerical Experiments and Empirical Formulae

Buccino¹,

Tuozzo²,

Ciccaglione³

et al. 2021

Geosciences

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“…Erosive processes due to Molise's traverses and check-dams were intensively deepened in recent studies [6,7], even in other sites of southern Italy [8]. The progressive erosion process has been dealt with, over the years, using structural measures, which consequently resulted in a "hardening" of the coast (with detached breakwaters and groins) of about 62% [4,9].…”

Section: Regional Setting 21 Molise Coast and Shoreline General Trendmentioning

confidence: 99%

“…The focus of this article was on a stretch of coast extending from the groin armoring the Trigno river southside mouth, up to 5.2 km southward (Figure 2), which encompasses the sandy beaches of Costa Verde and Marinelle. In the first 2 km, the reach is defended by a system of 11 groins, with an average length of 68 m and a mean spacing of 170 m. The analyses of the most recent evolution trends of the Molise coast [4,9,10] all indicated this area as subject to intense erosion, with local rates of retreat as large as −8 m/year. However, the Trigno river mouth and the nearby shoreline have been experiencing significant evolution for nearly 150 years, as well documented in the literature [12].…”

Section: Trigno River Mouthmentioning

confidence: 99%

Trigno River Mouth Evolution via Littoral Drift Rose

Ciccaglione

Buccino

Paola

et al. 2021

Water

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A mid-term analysis of shoreline evolution was carried out in the present paper for the Trigno river mouth area (5.2 km), located in the northern part of the Molise coast region (southeast Italy). The littoral drift rose (LDR) concept was employed, coupled to the GENESIS one-line model, to produce numerical simulations. The LDR graph was used to define a single, time-invariant, “equivalent wave” component (EW), which was supposed to entirely rule the shoreline changes. Given the inherent bimodality affecting the Molise wave climate, EW could result not significant in forecasting shoreline evolution, since both a climate inversion and a time-varying diffusion extra effect are expected. These aspects, never investigated in the literature, are deepened in the present paper, with the main aims of firstly assessing the explanatory power of the LDR equivalent wave and its significance within a bimodal climate, and secondly checking the role of a time-varying diffusivity. Results confirmed the reliability of the EW concept, even within a bimodal climate. Moreover, the possible effect of a time-varying diffusion, which is expected with a large directional variability, produced insignificant results with respect to the EW.

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Holocene to near-future evolution of the southern Molise coast (Central Adriatic, Italy) under the influence of natural and anthropogenic controls

Di Paola,

Valente,

Caporizzo

et al. 2023

Journal of Maps

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Influence of hard defence structures on shoreline erosion along Molise coast (southern Italy): a preliminary investigation

Cited by 4 publications

References 0 publications

Predicting Crenulate Bay Profiles from Wave Fronts: Numerical Experiments and Empirical Formulae

Predicting Crenulate Bay Profiles from Wave Fronts: Numerical Experiments and Empirical Formulae

Trigno River Mouth Evolution via Littoral Drift Rose

Holocene to near-future evolution of the southern Molise coast (Central Adriatic, Italy) under the influence of natural and anthropogenic controls

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