Long-Term Management Policies of Reservoirs: Possible Re-Use of Dredged Sediments for Coastal Nourishment

Vincenzo, Annamaria De; Covelli, Carmine; Molino, Antonio Jacopo; Pannone, Marilena; Ciccaglione, Margherita Carmen; Molino, Bruno

doi:10.3390/w11010015

Cited by 34 publications

(34 citation statements)

References 34 publications

(59 reference statements)

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“…In the view of a possible reuse of all the deposited material behind the breakwater for coastal zone management and protection, A. De Vincenzo et al (2018) [54] offers an important analysis on how material accumulated in reservoirs might be reused in nourishment works. They reported a study case of the Guardialfiera reservoir in Italy, but this application suggests how such an approach can be tested, for instance, also in the restoration of coastal wetlands along the eastern shore of the United States.…”

Section: Discussionmentioning

confidence: 99%

The Impact of Submerged Breakwaters on Sediment Distribution along Marsh Boundaries

Vona

Gray

Nardin

2020

Water

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Human encroachment and development on coastlines have led to greater amounts of armoring of shorelines. Breakwaters are a common feature along coastlines, which are used to dampen wave energy and protect shorelines from flash floods or overwash events. Although common, their effects on sediment transport and marsh geomorphology are poorly understood. To address this gap, our study quantifies the effects of breakwaters on sediment transport and marsh evolution under different wave regimes using Delft3D-SWAN, a dynamic geomorphodynamic numerical model. Model configurations used the same numerical domain, but scenarios had different sediments, waves, tides, basin slopes and breakwater distances from the shoreline to explore how waves and tidal currents shape coastal margins. Model results suggested breakwaters were responsible for an average wave damping between 10–50%, proportional to the significant wave height across all modeled scenarios. Shear stress at the beginning of the marsh and the volume of sediment deposited at the end of the simulation (into the marsh behind the breakwater) increased on average between 20–40%, proportional to the slope and distance of the breakwater from the shoreline. Sediment trapping, defined as the ratio between the volume of sediment housed into the salt marsh behind and away from the breakwater, was found to be less than 1 from most model runs. Study results indicated that breakwaters are advantageous for wave breaking to protect shorelines from the wave’s energy, however, they might also be an obstacle for sediment transport, negatively affecting nourishment processes, and, consequently, impeded long-term salt marsh survival. Identifying a balance between waves dampening and shoreline nourishment should be considered in the design and implementation of these structures.

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Section: Discussionmentioning

confidence: 99%

The Impact of Submerged Breakwaters on Sediment Distribution along Marsh Boundaries

Vona

Gray

Nardin

2020

Water

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“…The borrow areas are typically located in relative close proximity (i.e., 10 to 50 km) from the coastal section where the sediment is placed, which implies that the origin of the sediment is typically similar. It is therefore expected that the grain size distribution of the nourished material matches with the native material, which is relevant for the stability of the nourished material [36,37], although too little field measurements of sediment at shoreface nourishments are available to understand potential sorting processes during the placement of the nourished material. For the Holland coast, it is expected that sorting processes are especially relevant outside the surfzone (i.e., where the suspension of size fractions differs for coarse and fine sand grains; [38]), while shoreface nourishments are placed for a large part inside the surfzone.…”

Section: Terschellingmentioning

confidence: 99%

Observations and Modelling of Shoreface Nourishment Behaviour

Huisman

Walstra

Radermacher

et al. 2019

JMSE

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Shoreface nourishments are commonly applied for coastal maintenance, but their behaviour is not well understood. Bathymetric data of 19 shoreface nourishments located at alongshore uniform sections of the Dutch coast were therefore analyzed and used to validate an efficient method for predicting the erosion of shoreface nourishments. Data shows that considerable cross-shore profile change takes place at a shoreface nourishment, while an impact at the adjacent coast is hard to distinguish. The considered shoreface nourishments provide a long-term (3 to ∼30 years) cross-shore supply of sediment to the beach, but with small impact on the local shoreline shape. An efficient modelling approach is presented using a lookup table filled with computed initial erosion–sedimentation rates for a range of potential environmental conditions at a single post-construction bathymetry. Cross-shore transport contributed the majority of the losses from the initial nourishment region. This transport was driven partly by water-level setup driven currents (e.g., rip currents) and increased velocity asymmetry of the waves due to the geometrical change at the shoreface nourishment. Most erosion of the nourishment takes place during energetic wave conditions ( H m 0 ≥ 3 m) as milder waves are propagated over the nourishment without breaking. A data-model comparison shows that this approach can be used to accurately assess the erosion rates of shoreface nourishments in the first years after construction.

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“…Finally, the other goal of the paper was coupling GIS with the erosion models to obtain an erodibility map, in order to identify the areas that need of mitigation interventions for the hydraulic protection of the territory, and to estimate the silting of reservoirs for a good management of them [34][35][36][37]. For this reason, the Camastra Basin was chosen to test the approach developed in this work because there is an important reservoir known as Camastra Reservoir.…”

Section: Introductionmentioning

confidence: 99%

Assessment of Erosion in River Basins: A Distributed Model to Estimate the Sediment Production over Watersheds by a 3-Dimensional LS Factor in RUSLE Model

et al. 2020

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Erosive processes influence on several phenomena. In particular, they could influence on land depletion, on vegetation weakening, on aggradation phenomena of intermediate, and plain reaches of rivers, on waterways interruption due to overaggradation phenomena caused by floods, and on the losses of water volumes that may be stored in reservoirs. Among the models proposed in the literature for the prediction of erosion on the annual scale, one of the most widely used is the Revised Universal Soil Loss Equation (RUSLE). In the present paper, starting from the definition of the original model, the authors improved the important combined slope length and slope angle (LS-factor), taking into account the mutual interaction of solid particles, in terms of path and confluences, so as to transform the model, which was first classified on a slope scale or at most on a parcel one, into a distributed model on a basin scale. The use of a distributed approach is an integral part of the analysis of the hydrogeological risk. In this way, it is possible to obtain a map of the erodibility of any basin, from which to derive the most vulnerable areas. The proposed methodology has been tested on the Camastra Basin, located in Basilicata Region of Southern Italy.

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Long-Term Management Policies of Reservoirs: Possible Re-Use of Dredged Sediments for Coastal Nourishment

Cited by 34 publications

References 34 publications

The Impact of Submerged Breakwaters on Sediment Distribution along Marsh Boundaries

The Impact of Submerged Breakwaters on Sediment Distribution along Marsh Boundaries

Observations and Modelling of Shoreface Nourishment Behaviour

Assessment of Erosion in River Basins: A Distributed Model to Estimate the Sediment Production over Watersheds by a 3-Dimensional LS Factor in RUSLE Model

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