Preprints
https://doi.org/10.5194/wes-2021-156
https://doi.org/10.5194/wes-2021-156
 
21 Feb 2022
21 Feb 2022
Status: this preprint is currently under review for the journal WES.

Scientific Challenges to Characterizing the Wind Resource in the Marine Atmospheric Boundary Layer

William Shaw1, Larry Berg1, Mithu Debnath2, Georgios Deskos2, Caroline Draxl2,3, Virendra Ghate4, Charlotte Hasager5, Rao Kotamarthi4, Jeffrey Mirocha6, Paytsar Muradyan4, William Pringle4, David Turner7, and James Wilczak8 William Shaw et al.
  • 1Pacific Northwest National Laboratory, Richland, WA 99352
  • 2National Wind Technology Center, National Renewable Energy Laboratory, Golden 80401, CO, USA
  • 3Renewable and Sustainable Energy Institute, Boulder, CO 80309, USA
  • 4Argonne National Laboratory, 9700 South Cass Ave., Lemont IL 60439
  • 5Technical University of Denmark, DTU Wind Energy, Risø Campus, Roskilde, Denmark
  • 6Lawrence Livermore National Laboratory, Livermore, CA 94550, USA
  • 7NOAA/Global Systems Laboratory, Boulder, CO 80305
  • 8NOAA/Physical Sciences Laboratory, Boulder, CO 80305

Abstract. With the increasing level of offshore wind energy investment, it is correspondingly important to be able to accurately characterize the wind resource in terms of energy potential as well as operating conditions affecting wind plant performance, maintenance, and lifespan. Accurate resource assessment at a particular site supports investment decisions. Post-construction, accurate wind forecasts are needed to support efficient power markets and integration of wind power with the electrical grid. To optimize the design of wind turbines, it is necessary to accurately describe the environmental characteristics, such as precipitation and waves, that erode turbine surfaces and generate structural loads as a complicated response to the combined impact of shear, atmospheric turbulence, and wave stresses. Despite recent considerable progress both in improvements to numerical weather prediction models and in coupling these models to turbulent flows within wind plants, major challenges remain, especially in the offshore environment. Accurately simulating the interactions among winds, waves, wakes, and their structural interactions with offshore wind turbines requires accounting for spatial (and associated time) scales from O(1 m) to O(100 km). Computing capabilities for the foreseeable future will not be able to resolve all of these scales simultaneously, necessitating continuing improvement in subgrid-scale parameterizations within highly non-linear models. In addition, observations to constrain and validate these models, especially in the rotor-swept area of turbines over the ocean, remains largely absent. Thus, gaining sufficient understanding of the physics of atmospheric flow within and around wind plants remains one of the grand challenges of wind energy, particularly in the offshore environment.

This paper provides a review of prominent scientific challenges to characterizing the offshore wind resource using as examples phenomena that occur in the rapidly developing wind energy areas off the United States. Such phenomena include horizontal temperature gradients that lead to strong vertical stratification; consequent features such as low-level jets and internal boundary layers; highly non-stationary conditions, which occur with both extratropical storms (e.g., nor’easters) and tropical storms; air-sea interaction, including deformation of conventional wind profiles by the wave boundary layer; and precipitation with its contributions to leading-edge erosion of wind turbine blades. The paper also describes the current state of modeling and observations in the marine atmospheric boundary layer and provides specific recommendations for filling key current knowledge gaps

William Shaw et al.

Status: final response (author comments only)

Comment types: AC – author | RC – referee | CC – community | EC – editor | CEC – chief editor | : Report abuse
  • RC1: 'Comment on wes-2021-156', Stefan Emeis, 02 Mar 2022
  • CC1: 'Comment on wes-2021-156', Robert Banta, 05 Apr 2022
  • RC2: 'Comment on wes-2021-156', Anonymous Referee #2, 29 Apr 2022

William Shaw et al.

William Shaw et al.

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Short summary
This paper provides a review of prominent scientific challenges to characterizing the offshore wind resource using as examples phenomena that occur in the rapidly developing wind energy areas off the United States. The paper also describes the current state of modelling and observations in the marine atmospheric boundary layer and provides specific recommendations for filling key current knowledge gaps.