Research Papers: Ocean Engineering

Vertical Wind Profiles in Non-Neutral Conditions: Comparison of Models and Measurements From Frøya

[+] Author and Article Information
Piotr Domagalski

Institute of Turbomachinery,
Lodz University of Technology,
Wolczanska 219/223,
Lodz 90-924, Poland
e-mail: piotr.domagalski@p.lodz.pl

Lars Morten Bardal

Department of Energy and Process Engineering,
Norwegian University of
Science and Technology,
Trondheim 7491, Norway
e-mail: lars.m.bardal@ntnu.no

Lars Roar Sætran

Department of Energy and Process Engineering,
Norwegian University of
Science and Technology,
Trondheim 7491, Norway
e-mail: lars.satran@ntnu.no

1Corresponding author.

Contributed by the Ocean, Offshore, and Arctic Engineering Division of ASME for publication in the JOURNAL OF OFFSHORE MECHANICS AND ARCTIC ENGINEERING. Manuscript received September 21, 2017; final manuscript received October 18, 2018; published online January 17, 2019. Assoc. Editor: Qing Xiao.

J. Offshore Mech. Arct. Eng 141(4), 041101 (Jan 17, 2019) (8 pages) Paper No: OMAE-17-1172; doi: 10.1115/1.4041816 History: Received September 21, 2017; Revised October 18, 2018

This paper presents an analysis of stratification-dependent mean velocity profiles measured in a Norwegian coastal wind climate, and its comparison with models available in the literature. For this purpose, we use 3 years of observations from a 100 m meteorological mast located at the Frøya island (150 km west of Trondheim, Norway), equipped with a set of two-dimensional (2D) ultrasonic anemometers. The presented analysis is preceded by a general description of the site wind climate, the atmospheric stratification, the roughness length, and the surface layer height. Finally, the measured wind velocity profile is compared with selected models: the basic power and logarithmic law and the stability-corrected models: stability-corrected logarithmic wind profile, the Panofsky and Dutton model, the Peña boundary layer height corrected model, and the correlation-based Smedman-Högström model.

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Fig. 1

Measurement site location (Adapted from Norwegian Mapping Authority)

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Fig. 2

Wind rose (outer graph) and direction dependent roughness length (inner graph)

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Fig. 3

Distribution of the Richardson number

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Fig. 4

Distribution of the Obukhov length

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Fig. 5

Atmospheric stability distribution

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Fig. 6

Stability binned mean velocity profiles

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Fig. 7

Stability binned mean velocity profiles, normalized by velocity at z1 = 10 m

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Fig. 14

Wind speed ratio between the measured and predicted wind velocity at z2 = 100 m against atmospheric stability

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Fig. 8

Comparison of logarithmic model (z0 = 0.0008–0.01 m) and power law (α = 0.12–0.14) with measured wind velocities. Results binned in three stability classes.

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Fig. 9

Comparison of logarithmic model (z0 = 0.0008–0.01 m) and power law (α = 0.12–0.14) with measured wind velocities (normalized by velocity at z1 = 10 m). Results binned in three stability classes.

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Fig. 10

Comparison of calculated and measured profiles for stability corrected logarithmic profile

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Fig. 11

Comparison of calculated and measured profiles for Panofsky and Dutton model

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Fig. 12

Comparison of calculated and measured profiles for Peña model

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Fig. 13

Comparison of calculated and measured profiles for Smedman-Högström and Högström model



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