Foundations and Moorings for Tidal Stream Systems
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Tide Simplified by Phil Clegg Sea Kayaking Anglesey
Tide Simplified By Phil Clegg Sea Kayaking Anglesey Tide is one of those areas that the more you learn about it, the more you realise you don’t know. As sea kayakers, and not necessarily scientists, we don’t have to know every detail but a simplified understanding can help us to understand and predict what we might expect to see when we are out on the water. In this article we look at the areas of tide you need to know about without having to look it up in a book. Causes of tides To understand tide is convenient to imagine the earth with an envelope of water all around it, spinning once every 24 hours on its north-south axis with the moon on a line parallel to the equator. Moon Gravity A B Earth Ocean C The tides are primarily caused by the gravitational attraction of the moon. Simplifying a bit, at point A the gravitational pull is the strongest causing a high tide, point B experiences a medium pull towards the moon, while point C has the weakest pull causing a second high tide. Because the earth spins once every 24 hours, at any location on its surface there are two high tides and two low tides a day. There are approximately six hours between high tide and low tide. One way of predicting the approximate time of high tide is to add 50 minutes to the high tide of the previous day. The sun has a similar but weaker gravitational effect on the tides. On average this is about 40 percent of that of the moon. -
WATER ENVIRONMENT A3d.1 INTRODUCTION
Offshore Energy SEA APPENDIX 3d - WATER ENVIRONMENT A3d.1 INTRODUCTION A number of aspects of the water environment are reviewed below in a UK context, and for individual Regional Seas: • The major water masses and residual circulation patterns in UK seas • Density stratification (influenced principally by temperature and salinity) and frontal zones between different water masses – these represent potentially important areas for biological productivity • Tidal flows • Overall patterns of temperature and salinity • Wave climate • Ambient noise Recent assessments of changes in hydrographic conditions are summarised, based mainly on reports by DEFRA (2004a, b) and MCCIP (2007). Overall, significant anomalies and changes have been noted in sea surface temperature (SST), thermal stratification, circulation patterns, wave climate, pH and sea level – many appear to be correlated to atmospheric climate variability as described by the North Atlantic Oscillation (NAO). Larger- scale trends and process changes have also been noted in the North Atlantic (e.g. in the strength of the Gulf Stream and Atlantic Heat Conveyor (more properly characterised as the Meridional Overturning Circulation (MOC), or the Atlantic Thermohaline circulation (THC) e.g. Trumper 2005), Northern Hemisphere (Weijerman et al. 2005) and globally (IPCC 2007a). There are varying degrees of confidence in the interpretation of observed data and prediction of future trends. Finally, the specific environmental issue of eutrophication is summarised. This is an area of concern in specific geographical areas, notably the southern North Sea and various coastal and estuarine locations. A3d.2 UK CONTEXT The history of broadscale studies of North Sea circulation and hydrographic patterns (e.g. temperature and salinity distribution) was briefly reviewed in SEA 2. -
A1d Water Environment
Offshore Energy SEA 3: Appendix 1 Environmental Baseline Appendix 1D: Water Environment A1d.1 Introduction A number of aspects of the water environment are reviewed below in a UK context, and for individual Regional Seas: • The major water masses and residual circulation patterns • Density stratification (influenced principally by temperature and salinity) and frontal zones between different water masses • Tidal flows • Tidal range • Overall patterns of temperature and salinity • Wave climate • Internal waves • Water Framework Directive ecological status of coastal and estuarine water bodies • Eutrophication • Ambient noise Recent assessments of changes in hydrographic conditions are summarised, based mainly on reports by Defra (2010a, b) and MCCIP (2013) but incorporating a range of other grey and peer reviewed literature sources. Overall, significant anomalies and changes have been noted in sea surface temperature (SST), thermal stratification, circulation patterns, wave climate, pH and sea level – many appear to be correlated to atmospheric climate variability as described by the North Atlantic Oscillation (NAO). Larger-scale trends and process changes have also been noted in the North Atlantic (e.g. in the strength of the Gulf Stream and Atlantic Heat Conveyor (more properly characterised as the Meridional Overturning Circulation (MOC), or the Atlantic Thermohaline circulation (THC), northern hemisphere and globally. There are varying degrees of confidence in the interpretation of observed data and prediction of future trends. A1d.2 UK context There have been a number of information gathering and assessment initiatives which provide significant information on the current state of the UK and neighbouring seas, and the activities which affect them. These include both UK wide overview programmes and longer term specific monitoring and measuring studies. -
Merging Velocity Measurements and Modeling to Improve Understanding of Tidal Stream Resource in Alderney Race
Merging velocity measurements and modeling to improve understanding of tidal stream resource in Alderney Race. Maxime Thiébaut, Alexei Sentchev, Pascal Bailly Du Bois To cite this version: Maxime Thiébaut, Alexei Sentchev, Pascal Bailly Du Bois. Merging velocity measurements and modeling to improve understanding of tidal stream resource in Alderney Race.. Energy, Elsevier, 2019, 178, pp.460-470. 10.1016/j.energy.2019.04.171. hal-02336285 HAL Id: hal-02336285 https://hal.archives-ouvertes.fr/hal-02336285 Submitted on 28 Oct 2019 HAL is a multi-disciplinary open access L’archive ouverte pluridisciplinaire HAL, est archive for the deposit and dissemination of sci- destinée au dépôt et à la diffusion de documents entific research documents, whether they are pub- scientifiques de niveau recherche, publiés ou non, lished or not. The documents may come from émanant des établissements d’enseignement et de teaching and research institutions in France or recherche français ou étrangers, des laboratoires abroad, or from public or private research centers. publics ou privés. Distributed under a Creative Commons Attribution - NonCommercial - NoDerivatives| 4.0 International License Merging velocity measurements and modeling to improve understanding of tidal stream resource in Alderney Race Maxime Thiébaut1,2 , Alexei Sentchev*1 and Pascal Bailly du Bois3 (1) Univ. Littoral Côte d’Opale, Univ. Lille, CNRS, UMR 8187, LOG, Laboratoire d’Océanologie et de Géosciences, Wimereux, France (2) France Énergies Marines, Technopôle Brest-Iroise, Batîment Cap Océan, 525 Avenue de Rochon, Plouzané, France (3) IRSN/DEI/SECRE/LRC, Institut de Radioprotection et de Sûreté Nucléaire, Direction de l Environnement et de l Intervention, Laboratoire de Radioécologie de Cherbourg Octeville, France (*) Corresponding author: [email protected] Phone : +33 3 21 99 64 17 Fax : + 33 3 21 99 64 01 Abstract Tidal circulation and tidal stream resource in Aldemey Race (Raz Blanchard) were assessed by using a towed acoustic Doppler current profiler (ADCP) system and tidal modeling. -
Environmental, Health, and Safety Guidelines for Offshore Oil and Gas Development
ENVIRONMENTAL, HEALTH, AND SAFETY GUIDELINES OFFSHORE OIL AND GAS DEVELOPMENT June 5, 2015 ENVIRONMENTAL, HEALTH, AND SAFETY GUIDELINES FOR OFFSHORE OIL AND GAS DEVELOPMENT INTRODUCTION 1. The Environmental, Health, and Safety (EHS) Guidelines are technical reference documents with general and industry-specific examples of Good International Industry Practice (GIIP).1 When one or more members of the World Bank Group are involved in a project, these EHS Guidelines are applied as required by their respective policies and standards. These industry sector EHS guidelines are designed to be used together with the General EHS Guidelines document, which provides guidance to users on common EHS issues potentially applicable to all industry sectors. For complex projects, use of multiple industry sector guidelines may be necessary. A complete list of industry sector guidelines can be found at: www.ifc.org/ehsguidelines. 2. The EHS Guidelines contain the performance levels and measures that are generally considered to be achievable in new facilities by existing technology at reasonable costs. Application of the EHS Guidelines to existing facilities may involve the establishment of site-specific targets, with an appropriate timetable for achieving them. 3. The applicability of the EHS Guidelines should be tailored to the hazards and risks established for each project on the basis of the results of an environmental assessment in which site-specific variables, such as host country context, assimilative capacity of the environment, and other project factors, are taken into account. The applicability of specific technical recommendations should be based on the professional opinion of qualified and experienced persons. 4. When host country regulations differ from the levels and measures presented in the EHS Guidelines, projects are expected to achieve whichever are more stringent. -
Rules for Building and Classing Mobile Offshore Units 2021
Rules for Building and Classing Mobile Offshore Units Part 8 Specific Unit Types July 2021 RULES FOR BUILDING AND CLASSING MOBILE OFFSHORE UNITS JULY 2021 PART 8 SPECIFIC UNIT TYPES American Bureau of Shipping Incorporated by Act of Legislature of the State of New York 1862 © 2021 American Bureau of Shipping. All rights reserved. ABS Plaza 1701 City Plaza Drive Spring, TX 77389 USA PART 8 Specific Unit Types CONTENTS CHAPTER 1 Mobile Offshore Units..........................................................................1 Section 1 General..............................................................................2 CHAPTER 2 Drilling Units.........................................................................................5 Section 1 General..............................................................................7 CHAPTER 3 Accommodation Units.......................................................................19 Section 1 General............................................................................20 CHAPTER 4 Crane Units.........................................................................................24 Section 1 General............................................................................25 CHAPTER 5 Construction and Maintenance Units.............................................. 27 Section 1 General............................................................................28 CHAPTER 6 Drilling Tenders..................................................................................30 Section 1 General............................................................................31 -
Offshore Wind Turbine Foundation Installation Vessel
Off shore Reliable partner for effi cient off shore soluti ons Royal IHC – Off shore Smitweg 6, 2961 AW Kinderdijk P.O. Box 1, 2960 AA Kinderdijk The Netherlands T +31 78 691 09 11 off [email protected] www.ihcmerwede.com Contents Royal IHC – Off shore 4 Reliable partner for effi cient off shore soluti ons Market segments 6 Oil and gas 7 Renewable energy Product groups 8 Pipelaying 4 12 2524 12 Cablelaying 16 Module handling and well interventi on 18 Off shore support 20 Diving support 24 Off shore wind farm installati on 26 Pile-driving 28 FPSO installati on and offl oading 30 Handling, lift ing and deep-water lowering 32 Hydraulic systems 33 Electrical power and automati on systems 6 17 26 34 IHC Life-cycle support 7 18 32 8 20 34 2 Royal IHC | Off shore Off shore | Royal IHC 3 Royal IHC – Off shore SAPURA DIAMANTE Royal IHC’s off shore division strives to deliver the best value to its customers. It is a partner of choice for innovati ve, Reliable partner for sustainable and integrated off shore vessels and equipment. IHC’s off shore soluti ons are reliable, effi cient and fl exible to the demands of challenging seabed-to-surface oil and gas projects, and the renewable energy market. With its extensive effi cient off shore soluti ons knowledge and in-house design capabiliti es, IHC ensures compliance with the latest technological developments, strictest safety regulati ons and most stringent environmental standards. Reliable IHC excels at managing the complexity inherent within the development of vessels. -
Innovation and Learning in Complex Offshore Construction Projects
Research Policy 29Ž. 2000 973±989 www.elsevier.nlrlocatereconbase Innovation and learning in complex offshore construction projects James Barlow ) SPRU-Science and Technology Policy Research Unit, UniÕersity of Sussex, Brighton, BN1 9RF, UK Abstract Concern about the poor performance of the construction industry, in the UK and elsewhere, is coming at a time when its customers are demanding more and projects are becoming increasingly complex. Many of the industry's performance problems stem from inadequate inter-organisational co-operation. The paper explores the problems and solutions in aligning the construction industry more closely to its customers in CoPS-type projects. Using the example of a high value, high complexity offshore oilfield construction project, the paper examines the use of `partnering' as a tool for stimulating performance gains at the project level and innovation and learning benefits at the organisational level. q 2000 Elsevier Science B.V. All rights reserved. Keywords: Construction industry; Offshore sector; Partnering; Innovation; Learning 1. Introduction unique to the UK Ð include low productivity, an adversarial environment and the limited take-up of Concern about the poor performance of the con- technological and business process innovations. Con- struction industry, and its lack of innovation, is flicting interests arise because project participants coming at a time when its customers are demanding have differing goals and priorities, and risk is trans- more and projects are becoming increasingly com- ferred down the supply chain to those who are plex. The construction and maintenance of major generally least able to bear it. transport and urban infrastructure schemes, highly The paper explores the problems and solutions in complex production facilities for the microprocessor aligning the construction industry more closely to its and pharmaceutical industries, or offshore oil and customers in CoPS-type projects. -
Assessment of the Effects of Noise and Vibration from Offshore Wind Farms on Marine Wildlife
ASSESSMENT OF THE EFFECTS OF NOISE AND VIBRATION FROM OFFSHORE WIND FARMS ON MARINE WILDLIFE ETSU W/13/00566/REP DTI/Pub URN 01/1341 Contractor University of Liverpool, Centre for Marine and Coastal Studies Environmental Research and Consultancy Prepared by G Vella, I Rushforth, E Mason, A Hough, R England, P Styles, T Holt, P Thorne The work described in this report was carried out under contract as part of the DTI Sustainable Energy Programmes. The views and judgements expressed in this report are those of the contractor and do not necessarily reflect those of the DTI. First published 2001 i © Crown copyright 2001 EXECUTIVE SUMMARY Main objectives of the report Energy Technology Support Unit (ETSU), on behalf of the Department of Trade and Industry (DTI) commissioned the Centre for Marine and Coastal Studies (CMACS) in October 2000, to assess the effect of noise and vibration from offshore wind farms on marine wildlife. The key aims being to review relevant studies, reports and other available information, identify any gaps and uncertainties in the current data and make recommendations, with outline methodologies, to address these gaps. Introduction The UK has 40% of Europe ’s total potential wind resource, with mean annual offshore wind speeds, at a reference of 50m above sea level, of between 7m/s and 9m/s. Research undertaken by the British Wind Energy Association suggests that a ‘very good ’ site for development would have a mean annual wind speed of 8.5m/s. The total practicable long-term energy yield for the UK, taking limiting factors into account, would be approximately 100 TWh/year (DTI, 1999). -
Technical Eia Guidance Manual Offshore and Onshore Oil & Gas Exploration, Development and Production
Final Draft TECHNICAL EIA GUIDANCE MANUAL FOR OFFSHORE AND ONSHORE OIL & GAS EXPLORATION, DEVELOPMENT AND PRODUCTION Prepared for Ministry of Environment and Forests Government of India by IL&FS Ecosmart Limited Hyderabad September 2009 PROJECT TEAM Project Coordination Dr. (Mrs.) Nalini Bhat Ministry of Environment & Forests Advisor, Ministry of Environment and Forests Dr. (Mrs.) T. Chandni Director, Ministry of Environment and Forests Core Project Coordination Team Mr. Mahesh Babu IL&FS Environment CEO Mr. N. Sateesh Babu Vice President & Project Director Mr. B.S.V. Pavan Gopal Manager –Technical Mr. Padmanabhachar. K Environmental Engineer Ms. Chaitanya Vangeti GIS Engineer Ms. Suman Benedicta Thomas Technical Writer Resource Person Dr. Y. R. Mehta Former Director, Gas Authority of India Limited Expert Core & Peer Committee Chairman Dr. V. Rajagopalan, IAS Principal Secretary Government of Uttar Pradesh Core Members Dr. R. K. Garg Former Chairman, EIA Committee Ministry of Environment and Forests Mr. Paritosh C. Tyagi Former Chairman, Central Pollution Control Board Prof. S.P. Gautam Chairman, Central Pollution Control Board Dr. Tapan Chakraborti Director, National Environmental Engineering Research Institute Mr. K. P. Nyati Former Head, Environmental Policy, Confederation of Indian Industry Dr. G.K. Pandey Advisor, Ministry of Environment and Forests Dr. (Mrs.) Nalini Bhat Advisor, Ministry of Environment and Forests Dr. G.V. Subramaniam Advisor, Ministry of Environment and Forests Dr. B. Sengupta Former Member Secretary, Central Pollution Control Board Dr. R. C. Trivedi Former Scientist, Central Pollution Control Board Peer Members Dr. Hosabettu Former Director, Ministry of Environment and Forests Dr. B. D. Ghosh Director, Centre For High Technology Member Convener Mr. -
Diving & ROV Forum
Celebrating 50 years in 2016 Evening Technical Meeting: Diving & ROV Forum Wednesday, 16th March 2016 – Wood Group Kenny Offices, 171 Collins Street, Melbourne Onsite Registration 4.30 pm: Movie and Q&A session 5.00 pm – 6.30 pm: Networking, drinks and finger food (The Long Room, Georges Arcade, 162-168 Collins Street) 6.40 pm – 7.40 pm Places are limited so please register prior to the event at www.trybooking.com/KOII SUT Melbourne presents a documentary film on the successful rescue of a diver who became detached from his umbilical and was stranded on the seabed, created by Bibby Offshore. It will be followed by Q&A panel discussion, with diving and ROV experts, and networking drinks. The panellists for the evening are: Dusty Miller , Director, Infinity Offshore (Skyping from Perth) Dusty has been involved in all aspects of offshore construction diving since 1976 and has managed many offshore construction, intervention, repair and removal campaigns. In terms of SE Australian assets, he has worked on Longtom, Patricia-Baleen, Casino, Henry and Minerva fields. In the 1990s, he established and later sold his own diving company, the largest in Australia at the time. He has set up air and sea logistic operations for the UN, in Timor Leste, and for INPEX. Recently, Dusty has been involved in establishing use of the Diving Hardsuit, which reduces diving spread costs and extends diving operations beyond saturation water depths. David Inggall, Director, DIDesign (Int.) Pty Ltd For over 30 years David Inggall has been involved in the ROV and subsea remote intervention industry, covering all aspects of Subsea Intervention, predominately in Europe and now in Australasia. -
Williams Offshore Contractor Safety Handbook 27 October 2014
Williams Offshore Contractor Safety Handbook Version 1 Effective date: October 27, 2014 Table of Contents Introduction ................................................................................................... 6 Purpose .......................................................................................................... 7 Not Exhaustive and Not Legal Advice .......................................................... 8 Safety is a Condition of Continued Service ................................................. 8 Overview of Responsibilities ........................................................................ 8 Professional Conduct .................................................................................. 12 Authorization to Stop Work ........................................................................ 14 Drugs and Alcohol ....................................................................................... 15 Weapons ...................................................................................................... 17 Requirements for Offshore Work and Visitation ...................................... 18 SafeGulf Certification ................................................................................. 18 Transportation Worker Identification Card ............................................... 18 Fishing .......................................................................................................... 19 Security .......................................................................................................