The effect of water level rise on coastal wave Overwash and Inundation of dunes in laboratory

Qu, Zhipeng; Liang, Bingchen; Lee, Dong Hoon; Zhang, Zhaozi

doi:10.1016/j.ecss.2023.108246

Cited by 3 publications

(1 citation statement)

References 34 publications

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“…The swash and backwash processes associated with waves carry sediment landward and seaward, respectively, causing a net sediment movement. Tidal currents also influence sediment transport by exerting additional forces on the shoreline, redistributing sediment in response to the changing water levels (Khoury et al, 2019;Qu et al, 2023). Furthermore, alongshore sediment transport is responsible for shaping coastal features such as spits, barrier islands, and tombolos (Kobayashi et al, 2007;McCall et al, 2010).…”

Section: Introductionmentioning

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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Section: Introductionmentioning

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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Scientific basis, engineering feasibility and system optimization of green sea dykes for temperate mud coasts: a brief overview

Yu,

Jia,

Gao

2024

Anthropocene Coasts

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Green sea dykes, also known as ecosystem-based sea dykes, represent a novel type of coastal defense consisting of both traditional structural engineering and coastal ecosystems, designed to cope with the future trends of sea level rise and intensified storms. Here we focus on the mid-latitude mud coasts (eastern China in particular), which face the most prominent risks of storm surge, storm-induced giant waves, and shoreline erosion, and summarizes the scientific basis of green sea dykes and the current status of engineering practices. We show that the basic mechanisms of nearshore wave energy dissipation include bottom friction, sediment transport, and form drag. These explain the wave damping capacity of oyster reefs and salt marshes on mud coasts. In tidal flat environments, oyster growth increases frictional resistance and even causes wave breaking; the resuspension and transport of fine-grained sediments on salt marsh beds and the movement or resistance to hydrodynamic forcing of salt marsh vegetation stems effectively dissipate wave kinetic energy, and their efficiency increases with the elevation of the bed surface. Based on the wave damping capacity of oyster reefs and salt marshes on mud coasts, ecosystem-based sea dykes are being built in combination with traditional structured sea dykes. By utilizing natural tidal flats outside the dykes or implementing artificial modification projects, a certain scale of salt marshes and/or oyster reefs can be maintained, which serve to protect the sea dykes and enhance their wave resistance functions. From the perspective of system optimization, it is necessary to further improve the efficiency and sustainability of green sea dykes under constraints such as regional environment characteristics, ecosystem health, investment capacity, and ecological resilience. Related scientific issues include the theorization of the wave damping process of salt marshes, the niche and scale control of oyster reef and salt marsh ecosystems, the establishment of engineering standards and the design of the optimal form of sea dykes.

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Coastal processes and dune stability: Insights from wave transmission and runup modeling

Qu,

Meng,

Liang

2024

Physics of Fluids

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Dunes not only serve as natural landscapes but also act as crucial natural barriers protecting coastlines from storm surges. However, the stability of coastlines and dunes is further affected by climate change-induced sea level rise and increased storm activity. An effective evaluation of dune stability necessitates the collection of parameters such as wave height, changes in dune crest elevation, and dune erosion rates. This research employs wave flumes and high-speed camera technology in laboratory settings to observe and simulate coastal dynamics under overwash and collision regimes. The study investigates wave propagation under both regimes using the XBeach model. In the overwash regime, the model slightly overestimates the values of infragravity waves, whereas its accuracy improved under the collision regime. Moreover, in the overwash regime, higher wave skewness results in more sediment transport to the shore, exhibiting a linear relationship between sediment erosion volume and shoreline retreat distance. Through comparison with time series wave runup data obtained by cameras and traditional predictive formulas, the study validates the applicability of the formula proposed by Stockdon as a predictive tool for wave runup in this experiment. To evaluate dune stability, the study introduces the dimensionless overwash threshold parameter Cs, which is based on wave runup and dune crest elevation, to distinguish between dunes in a collision regime or an overwash regime. These findings help identify dune stability patterns, aiding in early detection of coastal erosion and assisting authorities in ecosystem management.

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The effect of water level rise on coastal wave Overwash and Inundation of dunes in laboratory

Cited by 3 publications

References 34 publications

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

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

Scientific basis, engineering feasibility and system optimization of green sea dykes for temperate mud coasts: a brief overview

Coastal processes and dune stability: Insights from wave transmission and runup modeling

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