Measurement and prediction of the initial settlement of cube-type artificial reefs caused by free-fall installation using a laboratory-scale experiment, regression analysis, and numerical collision analysis

Chau, Than Van; Jung, Sung-Min; Na, Won–Bae

doi:10.1016/j.oceaneng.2021.108643

Cited by 11 publications

(5 citation statements)

References 62 publications

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“…This repulsion force will cause the ball to bounce after hitting the surface, which means that when the ball falls on a denser surface, the energy lost from the ball is less so that the ball can bounce back with greater energy. The same thing was also found in the research conducted by Chau [14]. Figure 3 also shows a decrease in kinetic energy after the ball has bounced until it finally stops due to a reduction in the speed possessed by the ball.…”

Section: Resultssupporting

confidence: 81%

Determination of momentum after reflection in free fall using infrared and vibration sensors

Yardi,

Setiadi,

Rosandi

et al. 2023

J. Phys.: Conf. Ser.

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Collision events are often encountered in daily life, such as free-falling balls. The falling ball will cause momentum, which is influenced by the speed and mass of the object. When an object falls, its speed before and after colliding with the reflecting plane will determine the coefficient of restitution (e). In this study, an apparatus for physics experiment was made using a 110 mm diameter by 125 cm height PVC cylinder pipe with two photodiode sensors attached to detect light reflection on the falling object. A vibration sensor was installed on the base to detect the bouncing ball and authenticate the time measurement. Sensor readings and measurements occur once an automated actuator triggers the sensor. The experimental results showed that the ball falling on the aluminum reflecting plane experienced the longest oscillation with a time of 4.19 Seconds, followed by ceramic at 3.59 seconds and wood at 3.29 seconds. The contact time experienced by the ball is 0.8487 seconds on aluminum, 0.8093 seconds on ceramic and 0.7830 on wood. This experimental apparatus can help students understand physics material.

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Section: Resultssupporting

confidence: 81%

Determination of momentum after reflection in free fall using infrared and vibration sensors

Yardi,

Setiadi,

Rosandi

et al. 2023

J. Phys.: Conf. Ser.

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“…Indeed, from the survey of July 2021, i.e., soon after the reef installation, it seems that the initial settlement of the reefs was negligible: the difference in depth between their tops and the surrounding seabed (Figure 10a) is practically equal to the height of the units. This is expected for the present case due to the small static loads and because the units have been deployed on the foundation without free-fall installation (Figure 2b), so that momentum effects on the initial settlement [14] may be neglected.…”

Section: Monitoring Of the Seabed Subsidence Over The First Yearmentioning

confidence: 81%

Subsidence of Artificial Reefs with Bamboo Foundations on a Soft Seabed

Dini,

Nuzzolese,

Cafaro

et al. 2024

Applied Sciences

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The design of artificial reefs must be based on the criteria of both durability and serviceability. In this respect, the seabed subsidence rate related to the weight of the reefs and of their foundation system should be limited. The horizontal drift of the reefs during their life should be small too. In this study, pertaining to the behavior of artificial reefs made of microsilica concrete and realized with foundations in bamboo near the international airport of Hong Kong, 1-year monitoring data and calculations of reef foundation settlements are shown and discussed to assess the performance of the adopted mixed foundation and to deduce the nature of the long-term subsidence. The subsidence related to the settlements of the foundations was monitored using a Multibeam Echo Sounder System. It was found that the observed subsidence rate cannot be justified by the primary consolidation of the soils forming the seabed. Indeed, secondary consolidation seems to play an important role. Overall, after one year of service, the artificial reefs are considered to be effective in terms of limitation of both subsidence and drift.

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“…Consequently, some natural resources are being gradually depleted [4]. In this sense, Arti cial Reefs (ARs) emerge as promising options for: protecting and restoring habitats, enhancing biodiversity, increasing marine biomass and sh populations, reducing erosion, managing water quality, providing sustainable shing opportunities and also promoting tourism and recreational activities (recreational shing, sur ng, diving or boating) [4][5][6][7][8][9][10][11][12][13][14].…”

Section: Introduction Literature Review and Objectivesmentioning

confidence: 99%

“…">INTRODUCTION, LITERATURE REVIEW AND OBJECTIVESMarine ecosystems around the world have undergone considerable degradation due to several factors such as climate change, unsustainable shing patterns, or illegal trawling [1-3], among others.Consequently, some natural resources are being gradually depleted [4]. In this sense, Arti cial Reefs (ARs) emerge as promising options for: protecting and restoring habitats, enhancing biodiversity, increasing marine biomass and sh populations, reducing erosion, managing water quality, providing sustainable shing opportunities and also promoting tourism and recreational activities (recreational shing, sur ng, diving or boating) [4][5][6][7][8][9][10][11][12][13][14].ARs can be de ned as manmade structures placed on the seabed with the aim of imitating the most relevant characteristics of natural reefs [12][13][14][15]. At a more detailed level, it is possible to differentiate between Opportunity Arti cial Reefs (OARs) and Conventional Arti cial Reefs (CARs).…”

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confidence: 99%

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Exploring land and sea transport options for the installation of green artificial reefs (GARs) in shallow waters: the case study of Galician estuaries

Barros,

Munín-Doce,

Castro-Santos

et al. 2023

Preprint

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The aim of the present paper is to propose a new methodology for the production and installation of green artificial reefs (GARs) in shallow waters, with special attention to the transport stages. The process includes both onshore (manufacturing, road transport and unload at port) and offshore (load at port, sea transport, positioning, and deployment tasks) stages. Two different types of truck were analysed for the road transport. Furthermore, three different options were considered for the sea one: a workboat powered by liquefied natural gas, a barge using diesel (ECA distillate, 0.1% sulphur) as fuel, and an electric specific design barge. A simulation tool called AGARDO (Automatic Green Artificial Reef Deploy Optimisation) was developed for such a purpose. An estuary located in Galicia (North-West of Spain), where 180 GAR units must be installed, has been considered as case study. AGARDO was used to obtain results concerning process total time, equivalent CO2 emissions and costs for different scenarios. Consequently, the use of the proposed methodology allows the decision-maker to select the best option in terms of costs, emissions and time. AGARDO can be easily adapted to other case studies, with different onshore and offshore options.

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Measurement and prediction of the initial settlement of cube-type artificial reefs caused by free-fall installation using a laboratory-scale experiment, regression analysis, and numerical collision analysis

Cited by 11 publications

References 62 publications

Determination of momentum after reflection in free fall using infrared and vibration sensors

Determination of momentum after reflection in free fall using infrared and vibration sensors

Subsidence of Artificial Reefs with Bamboo Foundations on a Soft Seabed

Exploring land and sea transport options for the installation of green artificial reefs (GARs) in shallow waters: the case study of Galician estuaries

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