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Title: U.S. East Coast Lidar Measurements Show Offshore Wind Turbines Will Encounter Very Low Atmospheric Turbulence

Abstract

The rapid growth of offshore wind energy requires accurate modeling of the wind resource, which can be depleted by wind farm wakes. Turbulence dissipation rate (ϵ) governs the accuracy of model predictions of hub-height wind speed and the development and erosion of wakes. Here we assess the variability of turbulence kinetic energy and ϵ using 13 months of observations from a profiling lidar deployed on a platform off the Massachusetts coast. Offshore, ϵ is 2 orders of magnitude smaller than onshore, with a subtle diurnal cycle. Wind direction influences the annual cycle of turbulence, with larger values in winter when the wind flows from the land, and smaller values in summer, when the wind flows from open ocean. Because of the weak turbulence, wind plant wakes will be stronger and persist farther downwind in summer.

Authors:
ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [3]
  1. Univ. of Colorado Boulder, Boulder, CO (United States)
  2. Univ. of Colorado Boulder, Boulder, CO (United States); National Renewable Energy Lab. (NREL), Golden, CO (United States)
  3. Woods Hole Oceanographic Institution, Woods Hole, MA (United States)
Publication Date:
Research Org.:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org.:
USDOE Office of Energy Efficiency and Renewable Energy (EERE), Wind and Water Technologies Office (EE-4W)
OSTI Identifier:
1518584
Report Number(s):
NREL/JA-5000-73599
Journal ID: ISSN 0094-8276
Grant/Contract Number:  
AC36-08GO28308
Resource Type:
Accepted Manuscript
Journal Name:
Geophysical Research Letters
Additional Journal Information:
Journal Volume: 46; Journal Issue: 10; Journal ID: ISSN 0094-8276
Publisher:
American Geophysical Union
Country of Publication:
United States
Language:
English
Subject:
17 WIND ENERGY; turbulence; offshore wind energy; lidar; wakes

Citation Formats

Bodini, Nicola, Lundquist, Julie K., and Kirincich, Anthony. U.S. East Coast Lidar Measurements Show Offshore Wind Turbines Will Encounter Very Low Atmospheric Turbulence. United States: N. p., 2019. Web. doi:10.1029/2019GL082636.
Bodini, Nicola, Lundquist, Julie K., & Kirincich, Anthony. U.S. East Coast Lidar Measurements Show Offshore Wind Turbines Will Encounter Very Low Atmospheric Turbulence. United States. doi:10.1029/2019GL082636.
Bodini, Nicola, Lundquist, Julie K., and Kirincich, Anthony. Wed . "U.S. East Coast Lidar Measurements Show Offshore Wind Turbines Will Encounter Very Low Atmospheric Turbulence". United States. doi:10.1029/2019GL082636. https://www.osti.gov/servlets/purl/1518584.
@article{osti_1518584,
title = {U.S. East Coast Lidar Measurements Show Offshore Wind Turbines Will Encounter Very Low Atmospheric Turbulence},
author = {Bodini, Nicola and Lundquist, Julie K. and Kirincich, Anthony},
abstractNote = {The rapid growth of offshore wind energy requires accurate modeling of the wind resource, which can be depleted by wind farm wakes. Turbulence dissipation rate (ϵ) governs the accuracy of model predictions of hub-height wind speed and the development and erosion of wakes. Here we assess the variability of turbulence kinetic energy and ϵ using 13 months of observations from a profiling lidar deployed on a platform off the Massachusetts coast. Offshore, ϵ is 2 orders of magnitude smaller than onshore, with a subtle diurnal cycle. Wind direction influences the annual cycle of turbulence, with larger values in winter when the wind flows from the land, and smaller values in summer, when the wind flows from open ocean. Because of the weak turbulence, wind plant wakes will be stronger and persist farther downwind in summer.},
doi = {10.1029/2019GL082636},
journal = {Geophysical Research Letters},
number = 10,
volume = 46,
place = {United States},
year = {2019},
month = {5}
}

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