OCE 495 Objectives and Task List Fall 2008

Objectives and Respective Tasks 1.Site Selection 1.Review known information 2.Create screening criteria and undergo screening process 3.Rank sites 2.Wind Power Production Potential 1.Collect wind data from available resources 2.Create probability distribution and acquire turbine power curve 3.Estimate Power production 3.Site Characterization 1.Sediment bottom type 2.Wind characterization 3.Wave characterization 4.Storm surge considerations 4.Foundation and Structure Design 1.Consider specifications in DNV manual and design wind turbine mounting system and associated foundation 2.Assess sensitivity of design to depth and wave conditions

Site Selection Task 1: Review Known Information and Develop Criteria Method: –Read RIWINDS, Stakeholders Report, Battelle Report, Spaulding EBC Presentation, and other related material –First Tier Screening Criteria: Depth (NOAA Navigation Charts) Navigation (NOAA Navigation Charts) Area available –Second Tier Screening Criteria: Transformed wave characterization Bottom sediment type(USGS Needell and Lewis) Depth to bedrock(USGS Needell and Lewis) Cabling distance and permitting issues Special Area’s ( Resource use conflicts Visualization

RIWINDS 2007 Modifications: Cable area?, wave conditions, storm surge, bottom type, cabling distance, resource use conflict, and navigation (recreational and commercial)

Site Selection Task 2: Eliminate Deal Breakers and Evaluate Remaining Sites using Tier 2 Criteria Method: –Eliminate areas that don’t pass first tier criteria using GIS software –Evaluate remaining sites and assess them in terms of the second tier criteria

Site Selection Task 3: Rank Sites Method: –Document trade-offs between possible sites based on the tier 2 criteria –Order Sites from most viable to least viable as they pertain to the tier 2 criteria

Wind Power Production Potential Task1: Collect wind data from available resources Method: –WIS and Buzzards Bay Data –Transform data to hub height and site location

Wind Power Production Potential Task 2: Create probability distribution Method: –RIWINDS Report uses Weibull distribution See citation within the report –Verify using WIS or Buzzards Bay data This has been done in RIWINDS

Wind Power Production Potential Task 3: Estimate Power Method: –Determine which turbine to be used and attain associated power curve. –Compute average power based on frequency distribution and power curve –Provide graph of power production with respect to frequency to show percentage of time power is being generated

Site Characterization Task 1: Sediment and Bottom Type Method: –USGS website to find sub-bottom profiles and depth to bedrock for site location –Find sediment type at the bottom and talk to Dr. Baxter about how to characterize bottom type Constraints Grain size Relevance to DNV specifications

Site Characterization Task 2: Wind Characterization Method: – Acquire wind data for the site Gathered in Objective 2, Task 1 –Calculate once in 25, 50, and 100 year return period predictions using Gumbell distribution

Site Characterization Task 3: Wave Characterization Method: – Acquire wave data for the site Gather data from WIS stations –Calculate once in 25, 50, and 100 year return period predictions using Gumbell distribution –Use STWAVE to transfer wave data to site location

Site Characterization Task 4: Storm Surge Method: –Estimate the high water levels during extreme storm conditions –Reevaluate wave data using STWAVE with water depths corresponding to the storm surge water levels

Foundation and Structure Design Task 1: Review DNV Manual Method: –Considerations for site characterization –Concentration on Structure/Foundation design in terms of wave and wind forcing Long Term Fatigue –Dynamic structure Extreme Storm Conditions

Foundation and Structure Design Task 2: Design Wind Turbine Mounting System and Associated Foundation Method: –Depth of mono-pile into sediment including shallow bedrock considerations –Diameter and thickness of mono-pile –Connecting turbine tower to mono-pile foundation

Foundation and Structure Design Task 3: Assess sensitivity of design to depth and wave conditions –Consider depths from 10 – 40 m –Consider wave period and amplitude Method: –Determine forces on a pile as a function of wave conditions and depth –Compare results within the domain of interest in terms of mono-pile thickness, diameter, and depth into sediment

Waves and foundation design consideration s Geo-Tech and foundation design consideration s Design Site Power Production Potential Wind data and analysis Wave data and analysis Storm Surge data and analysis Foundation and Structure Design Geo- Technical analysis Second Tier Screening Criteria Cost related (extreme waves, bottom type, interconnect distance, resource use conflict, etc.) First Tier Screening Criteria Deal breakers (depth, shipping lanes, airport exclusions, offset from shore, etc.) Site Characterizatio n

People and Tasks Site Selection –Tony –Kenny –Frank –Ulrike Wind –Nick –Matt Waves –Kate –Loren –Kevin Geo-Tech –Russ –Brad Foundation –Chris –Dan