Reliability Updating of Offshore Structures Subjected to Marine Growth

Marine growth is a known problem for oceanic infrastructure and has been shown to negatively impact the reliability of bottom-fixed or floating offshore structures submitted to fatigue or extreme loading. Among other effects, it has been shown to change drag forces by increasing member diameters and modifying the roughness. Bio-colonization being highly random, the objective of this paper is to show how one-site inspection data increases reliability by decreasing uncertainties. This can be introduced in a reliability-based inspection framework for optimizing inspection and maintenance (here, cleaning). The modeling and computation are illustrated through the reliability analysis of a monopile in the European Atlantic area subjected to marine growth and according to the plastic collapse limit state. Based on surveys of structures in the North Sea, long-term stochastic modeling (space and time) of the marine growth thickness is first suggested. A Dynamic Bayesian Network is then developed for reliability updating from the inspection data. Finally, several realistic (10–20 measurements) inspection strategies are compared in terms of reliability improvement and the accuracy of reliability assessment.

Kinetic Energy Climatology and Effective Resolution for the ERA5 Reanalysis

ERA5 represents the state of the art for atmospheric reanalyses and is widely used in meteorological and climatological research. In this work, this dataset is evaluated using the wind kinetic energy spectrum. Seasonal climatologies are generated for 30º latitudinal bands in the Northern Hemisphere (periodic domain) and over the North Atlantic area (limited-area domain). The spectra are also assessed to determine the effective resolution of the reanalysis. The results present notable differences between the latitudinal domains, indicating that ERA5 is properly capturing the synoptic conditions. The seasonal variability is adequate too, being winter the most energetic, and summer the least energetic season. The limited area domain results introduce a larger energy density and range. Despite the good results for the synoptic scales, the reanalysis' spectra are not able to properly reproduce the dissipation rates at mesoscale. This is a source of uncertainties which needs to be taken into account when using the dataset. Finally, a cyclone tropical transition is presented as a case study. The spectrum generated shows a clear difference in energy density at every wavelength, as expected for a highly-energetic status of the atmosphere.

Effects of temperature and salinity interaction on Vibrio spp and Vibrio parahaemolyticus in the intercontinental Euro-African Atlantic

Vibrionaceae include several human pathogens such as Vibrio cholerae, Vibrio vulnificus or Vibrio parahaemolyticus. The risk of vibriosis is increasing worldwide due to the effects of climate change and modified patterns of food consumption, leading to a considerable economic and public health interest in understanding the factors related to the greater abundance of vibrios. Fluctuations in Vibrio populations are strongly affected by changes in temperature and salinity, nonetheless, there is substantial variability in their effect and discrepancies in their specific roles. In this study, we analyzed the abundance, and spatiotemporal distribution of Vibrio in the Euro-African Atlantic area, focusing the investigation on associations with environmental factors and with an emphasis on V. parahaemolyticus. Using membrane-filtration, cultures and MALDI-TOF mass spectrometry, 191 samples from 12 locations were analysed and a biochemical and proteomic profile created. We developed two multivariate linear regression models for the density of Vibrio spp (adjusted R2 = 0.32 and 0.27) and a logistic regression model for the occurrence of V. parahaemolyticus (R2Nagelkerke = 0.32, Accuracy = 77%). Including the interaction between sea surface temperature (SST) and salinity in linear regression helps to explain the discrepancies found in several studies on the effect of these variables on the abundance of vibrios.

Improving Microalgae Research and Marketing in the European Atlantic Area: Analysis of Major Gaps and Barriers Limiting Sector Development

Microalgae and cyanobacteria represent a diverse renewable resource with significant potential for the industrial production of goods and services with high added value. However, scientific, technical/technological, legislative and market gaps and barriers still limit the growth of these markets in Europe and the number of exploited species. We conducted an in-depth survey of European microalgae researchers, experts and stakeholders to identify these limitations and to discuss strategies, recommendations and guidelines to overcome these barriers. Here, we present the findings of this study which detail the main promising markets for microalgae and cyanobacteria in the coming decades, an updated SWOT analysis of the sector, the current opportunities, limitations, risks and threats for microalgae research and market sectors in Europe, a traffic light analysis for a quick assessment of market opportunities for each microalgae sector and detailed recommendations/guidelines for overcoming the scientific, technical/technological, legislative and market gaps and barriers.

Legal Practitioners

In the wake of the efforts to fight the transatlantic slave trade during the nineteenth century the first system of international jurisdiction emerged, the so-called Mixed Commissions for the Abolition of the Slave Trade. These courts sought to guarantee the conviction of captured slave ships by a uniform set of practices, functions, and procedures for all of the commissions established throughout the Atlantic area. However, the Mixed Commissions were far from being a body of frictionless international cooperation. Instead, they were a fiercely contested place, where each member state sought to enforce its competing national interests concerning abolition. The aim of this chapter is to focus on this rather ambiguous character of the Mixed Commissions and its members. It focuses on the ambiguous roles of the commission members as legal actors, diplomats, and advocates in order to present the first system of international courts as a fiercely contested body of early international cooperation.

Interreg Atlantic Area AGEO Project – Explaining natural hazards and the role of citizen observatories through storytelling

<p>The Platform for Atlantic Geohazard Risk Management (AGEO) is a project co-financed under the Interreg Programme for the Atlantic Area that aims to launch five Citizens’ Observatory pilots on geohazards according to regional priorities:</p><ul><li>Citizens’ observatory on rockfalls and rockfall-triggers in the <strong>Canary Islands, Spain</strong></li> <li>Citizens’ observatory on rockfalls and rockfall-triggers in <strong>Giants' Causeway and Carrick-a-rede, Northern Ireland</strong></li> <li>Multihazard Citizens Observatory in <strong>Lisbon, Portugal</strong></li> <li>Citizens’ observatory of slope instability monitoring in <strong>Madeira island, Portugal</strong></li> <li>Citizens’ observatory of vulnerability to coastal Risks in <strong>Brittany, france</strong></li> </ul><p>These pilots will demonstrate how citizens’ involvement in geohazard risks prevention can strengthen regional and national risk management systems. The consortium is led by the Instituto Superior Técnico (Portugal) andcounts with several other partners from Portugal, Spain, France, Ireland and the United Kingdom.</p><p>Experiences gained during the implementation of the Citizens’ Observatory pilots will be used to formulate recommendations for the creation of future observatories in response to the widest range of hazards (both natural and human-induced) faced in the Atlantic region. Engaging citizens in Citizens Observatories requires the development of outreach strategies seeking to understand expectations and develop attitudes, behaviours and competencies relevant for the aims and activities of the observatories.</p><p>The AGEO Consortium identified and targeted relevant stakeholders using Mendelow’s (1991) power-interest matrix, and developed perceptual maps of stakeholders, adapted for each of the five Citizens’ Observatory pilots. This approach was the basis for the development of tailored value propositions formulated to raise awareness on geohazards  and mobilize citizens participation.</p><p>AGEO is also using storytelling to inspire the general public to action and emotionally implicate non-specialised audiences. This approach is being used to educate children at school age and to reach their parents (in the pilot regions).</p><p> </p><p> </p><p>Mendelow, A. L., 1991. Environmental Scanning: The Impact of the Stakeholder Concept. Proceedings from the Second International Conference on Information Systems 407-418. Cambridge, MA.https://aisel.aisnet.org/icis1981/20/</p>