The second generation of EN Eurocode standards is expected to be published between 2023 and 2026. These documents are being published as soon as they are available, to enable users to prepare for the transition from the first generation to second generation of Eurocodes. As set out in the National foreword of the BS EN second generation Eurocodes, UK adoptions of the first generation of Eurocodes will be withdrawn by BSI on 30 March 2028. That means there is a period of coexistence between 2023 and 2028 during which both first and second generation Eurocodes are available.
Until 30 March 2028, the first generation documents should be considered as the applicable standards for buildings and civil engineering works constructed in the UK unless otherwise specified by the relevant authority or in the specification for a particular project. While the use of provisions in second generation Eurocodes in conjunction with first generation Eurocodes is not precluded, it should be undertaken with care and should only be done when users are satisfied that it will not result in a lower level of reliability than the minimum level set in the first generation Eurocodes and associated UK National Annexes
1 Scope
1.1 Scope of EN 1991‑1‑8
(1) EN 1991‑1‑8 gives principles and rules to determine the values of wave and current actions on structures and civil engineering works in the coastal zone, i.e. works connected to, or in close vicinity to the shore.
NOTE 1 Provisions in EN 1991‑1‑8 are limited to hydrodynamic actions that can be directly quantified in terms of wave and/or current induced pressures and associated forces and moments on structures or structural parts.
NOTE 2 As opposed to offshore conditions, waves or currents in the coastal zone are generally affected by the presence of the seabed or shore.
NOTE 3 The coastal zone is typically defined as the area between the shoreline and the deep-water limit.
(2) EN 1991‑1‑8 describes the principles for defining the hydrodynamic conditions to be used for design, including sea water levels.
(3) EN 1991‑1‑8 addresses specifically actions from currents and waves on the following structure types:
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cylindrical structures;
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subsea pipelines;
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suspended decks;
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vertical face structures;
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permanently moored floating structures.
NOTE 1 Additional guidance can be needed for:
— moored structures in the coastal zone for renewable energy production or related to oil and gas production or processing;
— moored structures spanning areas with variable wave and current states (e.g. floating aquaculture farms or floating bridges).
NOTE 2 For hydraulic pressures caused by quasi-static water levels, and ground water, see EN 1997 (all parts).
(4) Actions addressed in EN 1991‑1‑8 do not cover:
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hydraulic resonance in sheltered areas or basins (phenomena also known as harbour resonance);
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translation waves, e.g. tsunamis;
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waves and currents induced by maritime operations, i.e. vessel wake, berthing and mooring;
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hydrodynamic actions induced by earthquakes;
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ice-induced pressures and forces;
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coastal structures where flood risk and/or erosion or sediment management is the dominant function.
1.2 Assumptions
(1) The assumptions given in EN 1990‑1 apply to this document.
(2) In addition, it is assumed that actions from waves and currents on coastal structures are determined by personnel appropriately qualified and experienced in the following fields:
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physical coastal environment including physics of waves and currents, statistical properties and propagation of such;
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marine hydrodynamics, wave and current interaction with structures in general and wave and current actions on structures in the coastal zone including i) fixed structures, and ii) floating structures;
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advanced methods including probabilistic methodology and physical model testing.