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Recreational PIANC The World Association for Navigation Commission Waterborne Navigation Infrastructure RecCom RecCom WG 222 DESIGN GUIDELINES FOR FLOATING BREAKWATERS IN MARINAS TERMS OF REFERENCE 1. Historical background - Definition of the problem Floating breakwaters, also known as wave attenuators, are wave protection structures with specific characteristics for specific wave environments, which require specialized design guidelines. Small craft harbours are often exposed to waves and require structures to protect docking facilities, boats and users from excessive wave-induced motions or wave damage. Among the several wave protection structures available, floating breakwaters are often considered at locations where vessel wake, or wave conditions are relatively mild but still conducive to unacceptable levels of agitation within a marina or small craft harbour. As opposed to breakwaters that are fixed and founded on the seabed, floating breakwaters anchored either with piles or mooring lines are dynamic. Consequently, they can only attenuate and not completely block incoming waves. Furthermore, to minimize footprint and reduce cost for most commercial applications, their size is constrained in a way that make them effective within a narrow range of wave periods of approximately up to 4 seconds The wave protection performance of a floating breakwater is closely related to its geometry, mass properties, mooring system and how these relate with the design wave conditions. Therefore, a good understanding of these relationships is critical for adequate design. Historically, floating breakwater design has been based on limited field and physical model experiments and empirical formulae derived from these. At times, the experimental data and empirical formulae have been used outside their range of validity and this has led to designs of poor performance and structures that have suffered catastrophic failure. Recent advances in applied research, materials, construction technologies and analytical tools and methods can significantly improve the understanding of floating breakwater performance and assist in the development of efficient and safe designs. PIANC PTC2 Working Group No. 13, Floating Breakwaters - A Practical Guide for Design and Construction, 1994, is the only guideline currently available and, in the light of recent advances, it is need of review and update. 2. Objectives The objectives of the proposed WG are to: 1. collect and review existing technical information on floating breakwater applied research, analysis, design, construction, installation, inspection and maintenance; 2. identify the existing best practices and design guidelines; 3. develop state-of-the-art practical guidelines for the design of efficient and safe floating breakwaters. 3. Earlier reports to be reviewed The WG shall review PIANC’s relevant publications including PIANC PTC2 Working Group No. 13, Floating Breakwaters - A Practical Guide for Design and Construction, 1994; and academic literature, reports, national and international standards, codes and guidelines. 4. Scope The expected scope of work necessary to achieve the objectives of the WG is the following: • Literature collection and review • Description of design principles (including functionality, operational, environmental and regulatory aspects) and guidelines • Description of floating breakwater design process and outcomes a. concepts (including historical developments) b. components 2  c. design (including site characterization and performance prediction) d. construction e. installation f. inspection and maintenance • Case Studies 5. Intended product Aid for the assessment and design of floating breakwaters. 6. Working Group Membership Membership of the WG shall include representatives from stakeholders and target users such as: engineers, port authorities, harbour masters, marina operators, fabricators and developers of marine products, marina design-build contractors and designers, and researchers. The range of WG expertise should cover practical knowledge in aspects such as planning, analysis, design, construction, installation, inspection and maintenance, as well as research focused on design performance and optimization. 7. Target Audience The target audience for the guidelines will be general maritime engineers and designers, marine product designers and fabricators, harbour masters, project managers, construction managers, and administrators. 8. Relevance 8.1. Relevance to countries in transition The guidelines can assist countries in transition with the growth of recreational navigation by providing information for the evaluation and adequate implementation of efficient, safe and low-cost floating breakwater designs for wave protection. Conversely, inappropriate construction of these types of works can result in costly damage during extreme events, poor operational performance, and generally discourage boating infrastructure development. 3 8.2. Climate Change and Adaptation Implications Depending on site conditions, floating breakwaters constitute an alternative to mitigate the effects and adapt to sea level rise given their modular and reconfigurable nature. 8.3. Relevance to Implementation of WwN Philosophy Floating breakwaters, in the right conditions, could provide wave protection with minimal impact on benthic resources. Early feasibility evaluation of adequate wave attenuator solutions can be a valuable technical tool for the implementation of WwN philosophy. 8.4. Relevance to UN Sustainable Development Goals This report is intended to directly contribute to the following SDG’s: • Goal 9: Develop quality, reliable, sustainable and resilient infrastructure • Goal 13: Strengthen resilience and adaptive capacity to climate-related hazards and natural disasters 8.5. Relevance to UN Small Island Development States (SIDS) Technically appropriate and cost-efficient solutions for sustainable coastal and boating infrastructure development supports SIDS. 4 Saatja: Kaidi Katus <[email protected]> Saadetud: 09.07.2019 13:10 Adressaat: Aire Jõeloo <[email protected]> Teema: Ed: PIANC setting up a new RecCom WG 222 on Design guidelines for floating breakwaters in marinas Tähtsus: Kõrgeim Manused: image009.jpg; image010.jpg; image011.jpg; image012.jpg; LETTER 222.pdf; TOR 222.pdf Saatja: Sabine Vandevelde [mailto:[email protected]] Saatmisaeg: Thursday, July 4, 2019 4:39 PM Adressaat: Sabine Vandevelde <[email protected]> Teema: PIANC setting up a new RecCom WG 222 on Design guidelines for floating breakwaters in marinas Tähtsus: Kõrge Dear all, See attached files, Kind regards, Sabine Van de Velde PIANC GENERAL SECRETARIAT Graaf de Ferraris - 8th Floor 20, Boulevard du Roi Albert II B3 - 1000 Brussels - BELGIUM Tel: + 32 2 553 71 61 E-mail: [email protected] Web: www.pianc.org PIANC The World Association for Brussels, 4 July 2019. Waterborne Transport Infrastructure To the First Delegates of the Qualifying Members of PIANC To the National Sections’ Secretaries of PIANC To the Platinum Partners of PIANC To The Sister Associations of PIANC Subject: Setting up of a new PIANC Working Group 222 on “Design guidelines for floating breakwaters in marinas”. Dear Madam, Dear Sir, The setting up of PIANC RecCom Working Group 222 on “Design guidelines for floating breakwaters in marinas”, has duly been approved as well as its term of reference, which are herewith enclosed. We kindly ask you to inform the secretariat of RecCom by 15 September 2019 (copy to the General Secretariat) about the name, qualification and (e-mail-) address of the expert, proposed by your country/organisation. Please enclose a brief curriculum vitae of the proposed expert together with some details about her/his professional experiences. An additional expert per country/organisation, being a young professional, can participate in the Working Group activities. Further I would like to remind you that Working Group Members should either be Individual Member of PIANC, working for a Corporate Member or Platinum Partner, be an invited expert or a be a member of a Sister Organisation. We remind you that in accordance with PIANC rules, the costs incurred in taking part in Working Group activities are borne by the member countries/organizations. We thank you beforehand for your collaboration. Yours sincerely, Geert Van Cappellen, Secretary-General. Reply to: Mr Esteban Biondi [email protected]