OCE 495 Task List Fall 2008

Objectives and Respective Tasks 1.Site Selection 1.Review known information 2.Grade Sites 3.Rank Sites 2.Wind Power Production Potential 1.Collect wind data from available resouces 2.Create probability distribution 3.Estimate Power production 3.Site Characterization 1.Sediment bottom type 2.Wind forcing 3.Wave forcing 4.Storm surge 4.Turbine Design 1.Consider foundation design specifications in DNV manual (sec. 10) 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) Special Area’s ( Area available –Second Tier Screening Criteria: Wave forcing (Spaulding’s EBC Presentation) Bottom sediment type(USGS Needell and Lewis) Depth to bedrock(USGS Needell and Lewis) Cabling distance

RIWINDS 2007 Modifications: Cable area?, wave conditions, storm surge, bottom type, interconnect distance, fishing areas, and boat traffic

Site Selection Task 2: Eliminate Deal Breakers and Grade Sites Method: –Eliminate areas that don’t pass first tier criteria using GIS software –Evaluate each possible site and grade them in terms of the second tier criteria

Site Selection Task 3: Rank Sites Method: –Using Grades and trade-offs between possible sites –Order Sites from most viable to least viable

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: –Apply cut-in and max-out wind speeds for particular turbine –Compute Power based on remaining frequency distribution and equation for power

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 Forcing Method: – Acquire wind data for the site Gathered in Objective 2, Task 1 –Calculate once in 25, 50, and 100 year storm predictions using Gumbell distribution –Determine forcing on the turbine due to extreme conditions

Site Characterization Task 3: Wave Forcing Method: – Acquire wave data for the site Gather data from WIS stations –Calculate once in 25, 50, and 100 year storm predictions using Gumbell distribution –Use STWAVE for wave analysis during extreme conditions

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

Turbine Design Task 1: Consider foundation design specifications in DNV manual (sec. 10) Method: –A. General A 300 Characteristics Properties of Soil A 400 Effects of cyclic loading –B. Stability of Sea Bottom B 100 Slope stability –C. Pile Foundations C 200 Design criteria for monopile foundations C 400 Design of piles subject to scour

Turbine Design Task 2: 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