Experimental modeling of bed morphological changes and toe erosion of emerged breakwaters due to wave-structure interactions in a deltaic coast

Overtopping phenomena and consequent floods cause significant damage to coastal communities. Morphological changes in front of structures during storms can influence their functionality, affecting their stability and leading to failures, impacting the population that are depending on those coastal interventions for their protection. The effect of climate changes, such as sea level rise and increase of the frequency and intensity of storms, can raise the number of overtopping events over defense structures, also increasing coastal morphological changes, challenging future managers, engineers and the scientific coastal communities. A review of morphological changes in front of coastal defense structures and in natural barriers due to overtopping, wave run-down and reflux was conducted. The objective of this review was to find and gather relevant information, sometimes dispersing, reflecting and grouping the concepts found in the literature. Additionally, the gaps in scientific research are addressed, focusing on topics that may be enhanced. Several keywords used in the research were presented, emphasizing the relationship between overtopping and models (physical and numerical), storms, defense structures and morphological changes, also related to wave run-down during storms. The results show that there is limited information available that is mainly related to morphological changes in front of coastal defense structures during storm events, showing an opportunity to develop knowledge.

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A Laboratory Scale of the Physical Model for Inclined and Porous Breakwaters on the Coastline of Soc Trang Province (Mekong Delta)

Nguyen

et al. 2023

Water

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In the last few decades, the Mekong Delta coastlines have suffered serious erosion. Strong waves during the Northeast Monsoon are one of the main reasons for this. Many types of breakwaters with different structural components have been designed and built to mitigate coastline erosion. Vertical seawalls have been widely used, but they create reflection waves, which can generate water particle kinematics in front of the structure and increase the toe scour. In this study, an innovative block of inclined and porous breakwaters was studied by conducting laboratory-scale experiments. The experimental results show that inclined and porous breakwaters can considerably reduce wave energy due to transmission, reflection, and diffraction compared to inclined breakwaters. The porosity on the front and back sides of the structures has also been studied. Letting sediment-laden seawaters penetrate inside the sheltered zones, porous breakwaters promote accretion and facilitate the forestation of mangrove belts.

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Experimental modeling of bed morphological changes and toe erosion of emerged breakwaters due to wave-structure interactions in a deltaic coast

Cited by 3 publications

References 55 publications

Experimental and numerical modeling of pile-rock breakwater gap arrangement for optimal coastal erosion protection in deltaic coasts

Experimental and numerical modeling of pile-rock breakwater gap arrangement for optimal coastal erosion protection in deltaic coasts

A State-of-the-Art Review on Storm Events, Overtopping and Morphological Changes in Front of Coastal Structures

A Laboratory Scale of the Physical Model for Inclined and Porous Breakwaters on the Coastline of Soc Trang Province (Mekong Delta)

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