Dutch experience with sand nourishments for dynamic coastline conservation – An operational overview

Brand, Evelien; Ramaekers, Gemma; Lodder, Quirijn

doi:10.1016/j.ocecoaman.2021.106008

Cited by 37 publications

(27 citation statements)

References 18 publications

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“…Besides the previously highlighted correlation to coastal dune evolution, the approach can be a valuable tool in (i) forecasting vulnerable alongshore dune sections (shallow dune ridges, gaps); (ii) identifying dune sections with a need for reinforcement [e.g. additional sand nourishment (Brand et al, 2022), sand fencing (Eichmanns et al, 2021), hybrid dune core strengthening (Nordstrom, 2019)] and (iii) tracking post-storm related vulnerable sections.…”

Section: Foredune Correlated Storm Surge Protectionmentioning

confidence: 99%

Foredune growth and storm surge protection potential at the Eiderstedt Peninsula, Germany

et al. 2023

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In the context of climate change and associated sea level rise, coastal dunes can provide an essential contribution to coastal protection against wave attack and flooding. Since dunes are highly dynamic systems, their potential safety levels are related to their long-term development, varying in time and space, however pertinent research that ties those aspects together are generally scarce. The objective of this study is to analyze the long-term development of a young coastal foredune at the Eiderstedt peninsula, Germany and assess its coastal protection potential. This research presents (i) a novel semi-automated Dune Toe Tracking (DTT) method to systematically extract dune toes from cross-shore elevation profiles; (ii) established tools to derive the extraction of characteristic dune parameters and (iii) a newly defined Critical Storm Surge Level (CSSL) to relate spatio-temporal dune growth with coastal storm surge protection. Based on geospatial survey data, initial dune formation was identified in the 1980s. By 2015, the foredune had developed over a 6.5 km coastal stretch with a mean annual growth of 7.4m³/m. During the course of dune evolution, the seaward dune toe shifted seaward by an average of 2.3m/yr, while simultaneously increasing in height by an average of 1.1 cm/yr. Overall, the foredune formation established a new line of defense in front of an existing dike/dune line that provides spatially varying protection against a mean CSSL of 3.4m + NHN and can serve as an additional buffer against wave attack during severe storm events.

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Section: Foredune Correlated Storm Surge Protectionmentioning

confidence: 99%

Foredune growth and storm surge protection potential at the Eiderstedt Peninsula, Germany

et al. 2023

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“…We suggest that project planners and stakeholders carefully evaluate the specific objectives, constraints, and environmental conditions of their particular site before selecting a beach nourishment method. Factors to consider may include the desired beach morphology, the availability of sediment sources, the cost-effectiveness of each method, and the long-term sustainability of the chosen approach (Brand et al, 2022). In the future, a combination of sand replenishment in different areas can be considered to bring out the best effect of sand replenishment and conservation and to improve the efficiency of beach nourishment.…”

Section: Discussionmentioning

confidence: 99%

An experimental study on the evolution of beach profiles under different beach nourishment methods

Meng,

Qu,

et al. 2024

Front. Mar. Sci.

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Due to the influence of storm surges, hard coastal protection structures may exacerbate beach erosion, hence beach nourishment methods are considered in coastal protection and restoration efforts. An experiment is conducted in a wave flume to compare the advantages and disadvantages of three types of beach nourishment methods (berm nourishment, profile nourishment, and bar nourishment) under non-storm and storm wave conditions. The experiment analyzes wave height distribution, beach morphology changes, net sediment transport, shoreline recession, beach width increase, and beach volume changes. The findings indicate that the implementation of bar nourishment strategies facilitates the pre-breaking of storm waves, thereby mitigating the disruption caused by wave breaking on water flow dynamics. Moreover, the application of berm and profile nourishment methods proves to be highly effective in expanding the width of the beach and bolstering its stability. However, it is worth noting that bar nourishment exhibits limited efficacy in terms of restoring beach berms and mitigating coastal erosion within the same duration of wave action. The study presents two equations incorporating hydrodynamic parameters to predict the erosion or accretion status of beaches, and compares the predicted results with experimental data, thereby refining the criteria and making the formulas more applicable to beach nourishment projects. These findings provide valuable insights into the strengths and weaknesses of different beach nourishment methods, which will contribute to the implementation of nourishment projects.

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“…Under these circumstances, sedimentation is an important mechanism to mitigate the shrinking of tidal flat and to restore the ecological function of tidal flat. Some practical approaches have been designed for utilizing sedimentation to prevent the erosion of tidal flats, which include soft solutions such as sand nourishments (Cooke et al, 2012;Van der Werf et al, 2015;Brand et al, 2022) and traditional hard solutions such as dikes, groins and seawalls (Kuang et al, 2019). Recently, some innovative underwater nourishments, which are located at the subtidal regions, such as the channel wall nourishment, the shoreface nourishment and the Mud Motor, have been proposed as a more simplified and economical process of nourishing, but the effect of nourishments on the local morphodynamics is still not well understood (Baptist et al, 2019;Huisman et al, 2019;Brand et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

Sedimentation of cohesive sediments at the subtidal flat affected by wind wave in high turbidity estuary

Shen

Zhu²,

Lou³

et al. 2023

Front. Mar. Sci.

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Sedimentation is an important mechanism to mitigate the shrinking of tidal flat and to restore its ecological function by means of sand or mud nourishment. To explore the sedimentation of cohesive sediments, a seabed tripod observation system was deployed at the subtidal region of the Hengsha Shoal adjacent to the turbidity maximum zone of the Yangtze Estuary for 11 days. The results showed that the fine sediment with the median grain size around 8 mm occupied the whole water column. The seabed was in relative equilibrium state with the fluctuation of bed level smaller than 16 mm during the moderate wind condition while the seabed experienced a rapid erosion of 38mm and a successive intensive accretion of 68mm during the process of wind wave and swell. The bottom hydrodynamic at 0.3mab during the bed accretion was stronger than that during the bed erosion. The deposition process of cohesive sediments can be better described by the simultaneous deposition paradigm than that by the exclusive deposition paradigm according to the direct data-model comparison of the bed level changes, especially during the impact of fluid mud. Three possible reasons for the better performance of the simultaneous deposition paradigm were proposed. The first possibility is that the fine suspended sediments do maintain a continuous contact with the sediment bed since the direct bed level changes during our observation period has been well reproduced by the simultaneous deposition paradigm. The second possibility is the SSC-induced turbulence damping which facilitates the fine sediment settling in the form of cohesive sediment flocs, indicating the settling of sediments can’t be judged by the critical shear stress for deposition just based on the single particle grain size. The last possibility is the fluid mud-induced overestimated bed shear stress by using turbulent velocity fluctuation above the fluid mud-water interface, which produces excess sediment erosion waiting to be compensated by the simultaneous deposition paradigm. For practical modeling purposes, modeling under the simultaneous deposition paradigm can give satisfactory results for the sedimentation of cohesive sediment especially during the impact of wave or swell.

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Dutch experience with sand nourishments for dynamic coastline conservation – An operational overview

Cited by 37 publications

References 18 publications

Foredune growth and storm surge protection potential at the Eiderstedt Peninsula, Germany

Foredune growth and storm surge protection potential at the Eiderstedt Peninsula, Germany

An experimental study on the evolution of beach profiles under different beach nourishment methods

Sedimentation of cohesive sediments at the subtidal flat affected by wind wave in high turbidity estuary

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