Artificial Reefs in Marseille: From Complex Natural Habitats to Concepts of Efficient Artificial Reef Design

2010 ◽  
pp. 81-82 ◽  
Author(s):  
E. Charbonnel ◽  
F. Carnus ◽  
S. Ruitton ◽  
L. Le Direac’h ◽  
J.-G. Harmelin ◽  
...  
Keyword(s):  
Artificial Reef ◽  
Artificial Reefs ◽  
Natural Habitats

scholarly journals Spatial Heterogeneity of Artificial Reefs Functioning according to Wind-Induced Lagrangian Circulation

2013 ◽  
Vol 2013 ◽  
pp. 1-9 ◽  
Author(s):  
Marie-Aude Pradal ◽  
Bertrand Millet
Keyword(s):  
Numerical Model ◽  
Spatial Heterogeneity ◽  
Particle Flux ◽  
Artificial Reef ◽  
Ocean Model ◽  
Artificial Reefs ◽  
Natural Habitats ◽  
Southern France ◽  
3D Numerical Model ◽  
Fine Resolution

In the scope of the program “Récifs Prado” for artificial reef immersion in the bay of Marseilles (southern France), we adapted the fine resolution (100 m) of the 3D numerical model POM (Princeton Ocean Model) to compute the typical patterns of the wind induced circulation within the bay. In addition, we derived from those results the Lagrangian trajectories of planktonic particles drifting over periods of 3 days, both from natural habitats to colonize the reefs, and inversely from the reefs to enrich peripheral ecosystems. Results emphasized the high spatial heterogeneity of the reefs functioning at short scales. First, reefs were submitted to a general southward particle flux, being colonized from the northern bay and then impacting the southern bay 50% and 40% of the time, respectively. Second, adjacent reefs frequently showed contrasted impacts, with fluxes simultaneously oriented offshore or inshore, in opposite directions. Third, at the top of reefs particles were released both southward and northward 32% and 8.6% of the time, respectively; when at the bottom of reefs particles were only released southward 40% of the time.

scholarly journals Artificial reefs in marseille (France, Mediterranean sea): from complex natural habitats to concept of efficient artificial reef design

2011 ◽  
Vol 59 (spe1) ◽  
pp. 177-178 ◽  
Author(s):  
Eric Charbonnel ◽  
Jean-Georges Harmelin ◽  
François Carnus ◽  
Laurence Le Direac'h ◽  
Sandrine Ruitton ◽  
...  
Keyword(s):  
Mediterranean Sea ◽  
Artificial Reef ◽  
Artificial Reefs ◽  
Natural Habitats

scholarly journals REDUCTION OF WAVE OVERTOPPING RATE BY THE USE OF ARTIFICIAL REEFS

1988 ◽  
Vol 1 (21) ◽  
pp. 23
Author(s):  
Toru Sawaragi ◽  
Ichiro Deguchi ◽  
San-Kil Park
Keyword(s):  
Wave Breaking ◽  
Artificial Reef ◽  
Numerical Procedure ◽  
Artificial Reefs ◽  
Irregular Waves ◽  
Analysis Method ◽  
Wave Analysis ◽  
Wave Overtopping ◽  
Unidirectional Flow ◽  
Individual Wave

A wave overtopping rate from a sea dike of various toe depths is formulated based on a weir model in an unidirectional flow. To evaluated the wave overtopping rate from a seadike on an artificial reef by the weir model, a numerical procedure for predicting wave transformations including the effect of forced wave breaking on the reef is constructed. After confirming the applicability of the model through experiments with regular and irregular waves, the effect of artificial reef on wave overtopping is discussed. So-called individual wave analysis method is shown to he applicable to the wave overtopping caused by irregular waves.

Dispersal of yellowtail kingfish (Seriola lalandi) from a coastal embayment following a recreational fisheries enhancement stocking program: attempts to integrate aquaculture and habitat-based initiatives

2021 ◽  
Author(s):  
Alistair Becker ◽  
Michael B Lowry ◽  
D Stewart Fielder ◽  
Matthew D Taylor
Keyword(s):  
Artificial Reef ◽  
Artificial Reefs ◽  
Recreational Fisheries ◽  
Dispersal Patterns ◽  
The North ◽  
Sea Ranching ◽  
In The Wild ◽  
Yellowtail Kingfish ◽  
Seriola Lalandi ◽  
Fisheries Enhancement

Fisheries enhancement initiatives including marine stocking and artificial reef deployments are becoming increasingly common in many parts of the world. Combining the two by releasing hatchery reared fish onto artificial reefs is used in sea-ranching operations but is an approach rarely adopted for recreational fisheries. Yellowtail kingfish (Seriola lalandi) form a valuable recreational fishery in Australia and in 2018 a pilot stocking program was initiated to enhance this fishery. Fish were released onto estuarine artificial reefs in Botany Bay to evaluate if estuarine artificial reefs are suitable release habitat for juvenile yellowtail kingfish and to monitor their dispersal patterns using acoustic telemetry and a tag-recapture program. Both approaches showed similar patterns, indicating juvenile yellowtail kingfish rapidly dispersed from the release location and can travel at least 60 km during their first weeks in the wild. Twenty percent of the acoustically tagged fish entered nearby estuaries to the north and south and tagged fish were also recaptured in these estuaries, indicating that the estuaries provide habitat for juveniles. There was little interaction between stocked fish and two large coastal artificial reefs positioned near Botany Bay. Stocked yellowtail kingfish will likely disperse rapidly from release locations which is consistent with their pelagic life history. While this may present challenges to fisheries managers, increasing release numbers to maintain stocking densities over a broader area may provide a solution. Future releases of fish on coastal natural and artificial reefs are an important next step in refining stocking practices for this species and will help further identify key juvenile habitats.

Impact of artificial reefs on sediment bacterial structure and function in Bohai Bay

2019 ◽  
Vol 65 (3) ◽  
pp. 191-200 ◽  
Author(s):  
Yu Wang ◽  
Jinsheng Sun ◽  
Enjun Fang ◽  
Biao Guo ◽  
Yuanyuan Dai ◽  
...  
Keyword(s):  
Artificial Reef ◽  
Control Area ◽  
Structure And Function ◽  
Artificial Reefs ◽  
Rrna Genes ◽  
Bohai Bay ◽  
Reef Area ◽  
The Future ◽  
And Function ◽  
And Control

Artificial reefs have significantly altered ecological and environmental conditions compared with natural reefs, but how these changes affect sediment bacteria structure and function is unknown. Here, we compared the structure and function of the sediment bacterial community in the artificial reef area, the future artificial reef area, and the control area in Bohai Bay by 16S rRNA genes sequencing. Our results indicated that bacteria communities in the sediment were both taxonomically and functionally different between the reef area and control area. In the artificial reef area, the α-diversity was significantly lower, whereas the β-diversity was significantly higher. Functional genes related to chemo-heterotrophy, nitrate reduction, hydrocarbon degradation, and the human pathogens and human gut were more abundant, whereas genes related to the metabolism of sulfur compounds were less abundant in the artificial reef than in the control area. The differences in bacterial communities were primarily determined by depth in the artificial reef area, and by total organic carbon in the future reef area and control area. This study provides the first overview of molecular ecology to assess the impacts of artificial reefs on the bacteria community.

scholarly journals The role of habitat creation in coral reef conservation: a case study from Aceh, Indonesia

Oryx ◽  
2012 ◽  
Vol 46 (4) ◽  
pp. 501-507 ◽  
Author(s):  
Nur Fadli ◽  
Stuart J. Campbell ◽  
Kathryn Ferguson ◽  
Jude Keyse ◽  
Edi Rudi ◽  
...  
Keyword(s):  
Local Community ◽  
Coral Cover ◽  
Artificial Reef ◽  
Marine Conservation ◽  
Artificial Reefs ◽  
Conservation Strategy ◽  
General View ◽  
Sea Temperature ◽  
Habitat Creation ◽  
Almost All

AbstractWe describe the successful creation of new reef habitat on Pulau Weh, Indonesia. Coral cover on artificial reef modules increased from a mean of 24±SE 2.4% 1 year after the initial attachment of Acropora spp. coral fragments to 64±SE 4.8% after 3 years. The artificial reef modules were also rapidly colonized by coral recruits. Recruit densities were 53±SE 3.2 m−2 on modules that had been submerged for only 1 year, nearly twice as high as recruit densities on natural reef substratum (31±2.8 m−2). Consequently, the original Acropora assemblage had increased to include at least 23 coral taxa, including 10 additional Acropora species. The artificial reefs also supported at least 29 reef fish species, from 11 families. Unfortunately, this initial success in habitat creation was abruptly halted by a rapid rise in sea temperature in May 2010 that killed almost all corals on the artificial reefs and on nearby natural reefs. Notwithstanding the general view that reef rehabilitation is yet to deliver ecological and conservation benefits at meaningful scales, other benefits of this project included raising the awareness of reef conservation in the local community, promotion of tourism on Pulau Weh and job creation. We conclude, therefore, that habitat creation has a legitimate role as part of an integrated marine conservation strategy.

Erosion Mitigation Using Submerged Breakwater Composed of Artificial Reefs

2015 ◽  
Vol 744-746 ◽  
pp. 1171-1174
Author(s):  
Kyu Han Kim ◽  
Bum Shick Shin
Keyword(s):  
Wave Attenuation ◽  
Three Dimensional ◽  
Artificial Reef ◽  
Beach Erosion ◽  
Artificial Reefs ◽  
Return Flow ◽  
Two Dimensional ◽  
Submerged Breakwater ◽  
Erosion Mitigation ◽  
Study Offer

In this study, erosion mitigation by submerged breakwater with artificial reefs is investigated among other means of countermeasures. Beach erosion mechanism near the submerged breakwater and the performance of artificial reef blocks are analyzed in the laboratory. Two-dimensional and three-dimensional laboratory experiments are applied to the analysis. The results of two-dimensional experiments prove that new artifi-cial blocks showed a better performance than the existing blocks in terms of wave attenuation due to wave breaking turbulence near the crest of the structure. Three-dimensional experiments show reduced return flow velocity by half by installing another type of new artificial block in between submerged breakwaters. Return flow has been creating vulnerability in countermeasures by submerged breakwater. Therefore, artifi-cial reef blocks suggested by this study offer solutions to the existing mitigation problems with submerged breakwater.

Are artificial reefs an appropriate solution to protect the Danube Delta coast?

2020 ◽  
Author(s):  
Irina Dinu
Keyword(s):  
Wave Climate ◽  
Sediment Supply ◽  
Danube River ◽  
Artificial Reefs ◽  
Coastal Protection ◽  
Danube Delta ◽  
Marine Geology ◽  
Natural Habitats ◽  
Wave Heights ◽  
The Impact

<p><strong>Are artificial reefs an appropriate solution to protect the Danube Delta coast?</strong></p><p>Irina Dinu<sup>1</sup>, Vicente Gràcia<sup>2</sup>, Manuel García-León<sup>3</sup>, Adrian Stănică<sup>1</sup></p><p> </p><p><sup>1</sup> – National Institute for Marine Geology and Geoecology (GeoEcoMar), 23-25 Dimitrie Onciul St., 024053, Bucharest, Romania</p><p><sup>2</sup> - Laboratory of Maritime Engineering, Polytechnic University of Catalonia (LIM-UPC), Campus Diagonal Nord, Building D1, 1-3 Jordi Girona St., 08034 Barcelona</p><p><sup>3</sup> - International Centre for Research of Coastal Resources (CIIRC), 1-3 Jordi Girona St., Mòdul D1, Campus Nord, 08003 Barcelona, Spain</p><p> </p><p>The Danube Delta coast is part of the Danube Delta Biosphere Reserve, thus being aimed to preserve its typical natural habitats. Over the last decades, human interventions along the Danube River, as well as coastal navigation and harbour protection works on the Romanian coast have determined the reduction of sediment supply along the Danube Delta coast, which is nowadays affected by erosion on its widest part.</p><p>Sustainable management plans for the Danube Delta coast include the use of working-with-nature solutions.</p><p>In this work, the effect of artificial reefs on the wave heights along the Danube Delta coast is studied. The results of a previous wave climate study and a wave model have been used for this purpose. Simulations have been performed for different setup of artificial reefs and for extreme storms with various return periods. The effect of sea level rise has also been taken into account.</p><p>Our results show that artificial reefs are significantly effective in reducing the wave heights along the Danube Delta coast. However, further detailed analysis concerning the impact of such a coastal protection solution is still needed.  </p>

scholarly journals Artificial Reef Effect in relation to Offshore Renewable Energy Conversion: State of the Art

2012 ◽  
Vol 2012 ◽  
pp. 1-8 ◽  
Author(s):  
Olivia Langhamer
Keyword(s):  
Renewable Energy ◽  
Side Effect ◽  
Artificial Reef ◽  
Wind Farms ◽  
Offshore Wind ◽  
Artificial Reefs ◽  
Offshore Wind Farms ◽  
Positive Side ◽  
Native Populations ◽  
New Habitats

The rapid worldwide growth of offshore renewable energy production will provide marine organisms with new hard substrate for colonization, thus acting as artificial reefs. The artificial reef effect is important when constructing, for example, scour protections since it can generate an enhanced habitat. Specifically, artificial structures can create increased heterogeneity in the area important for species diversity and density. Offshore energy installations also have the positive side effect as they are a sanctuary area for trawled organisms. Higher survival of fish and bigger fish is an expected outcome that can contribute to a spillover to outer areas. One negative side effect is that invasive species can find new habitats in artificial reefs and thus influence the native habitats and their associated environment negatively. Different scour protections in offshore wind farms can create new habitats compensating for habitat loss by offshore energy installations. These created habitats differ from the lost habitat in species composition substantially. A positive reef effect is dependent on the nature and the location of the reef and the characteristics of the native populations. An increase in surface area of scour protections by using specially designed material can also support the reef effect and its productivity.

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