Evaluation of stability corrections in wind speed profiles over the North Sea

Wijk, Ad van; Beljaars, Anton; Holtslag, A.A.M.; Turkenburg, W.C.

doi:10.1016/0167-6105(90)90007-y

Cited by 62 publications

(33 citation statements)

References 17 publications

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“…For I,& we adopt the proposals by Dyer (1974) for unstable conditions and by Holtslag and de Bruin (1988) for stable conditions. Also above the sea, it has been shown that simple flux parameterizations lead to a reasonable description of the wind speed in the lower part of the boundary layer (Large and Pond, 1982;Walmsley, 1988;Van Wijk et al, 1989 (Holtslag, 1984;Holtslag and de Bruin, 1988). For practical applications, several parameters in Equations (1) and (2) need to be parameterized.…”

Section: Wind Speed Profilesmentioning

confidence: 99%

“…This theory, together with simple parameterizations of the surface fluxes, has been successfully applied to routine wind data over land (Holtslag, 1984;Van Ulden and Holtslag, 1985) and over sea (Walmsley, 1988;Van Wijk et al, 1989). This theory, together with simple parameterizations of the surface fluxes, has been successfully applied to routine wind data over land (Holtslag, 1984;Van Ulden and Holtslag, 1985) and over sea (Walmsley, 1988;Van Wijk et al, 1989).…”

Section: Introductionmentioning

confidence: 99%

“…-Equilibrium profiles over sea that are described in terms of an observed wind speed at a single height and the air-water temperature difference (Van Wijk et al, 1989). -Wind profiles over land expressed in terms of the wind speed at z = zi and the stability obtained from cloud cover and solar elevation data (Holtslag, 1984;Van Ulden and Holtslag, 1985) -A model for the growth of the IBL dependent on the roughness length and the stability.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Diabatic wind speed profiles in coastal regions: Comparison of an internal boundary layer (IBL) model with observations

Beljaars

Holtslag

Turkenburg

1990

Boundary-Layer Meteorol

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A model is presented to transform wind speed observations at a single height over sea or near the coast to any possible location and height in a topographic flat coastal region (up to distances of about 5 km from the coast and up to heights of IO0 m). Only moderate and strong winds from the sea are considered, which are particularly important for wind energy applications. The model, called 'diabatic coast model', which is based on the well known internal boundary layer (IBL) concept and Monin-Obukhov similarity theory, describes the effects of the roughness transition from sea to land as well as the effect of stability on the shape of the profiles and the IBL growth. The predicted IBL heights are compared with published data.In the second part of this paper, the model is compared with measurements taken at the Maasvlakte location near the Dutch coast. It is shown that a neutral formulation of the IBL height is sufficient to model the overall mean wind speed with height, but that stability corrections are needed to describe the diurnal variations in wind speed properly. Finally, an application is given, where a single routine wind speed observation at the coast, combined with air-water temperature differences is used to predict the wind speed at 500m from the coast at heights of 10 and 53 m. The results are in good agreement with the measurements.

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Section: Wind Speed Profilesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Diabatic wind speed profiles in coastal regions: Comparison of an internal boundary layer (IBL) model with observations

Beljaars

Holtslag

Turkenburg

1990

Boundary-Layer Meteorol

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“…In the cases of offshore conditions, Van Wijk et al [3] obtained good estimates for the seasonal mean wind speed in the North Sea after applying their "diabatic" method to calculate the wind speed profile as a function of height, when wind speed, sea water temperature and air temperature are known. This diabatic method was also used by Coelingh et al to study offshore [4] and onshore sites [5].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the Wind Shear at a Site in the North-West of the Yucatan Peninsula, Mexico

2009

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Extrapolations from 10m above the ground up to the wind turbine hub height are frequently made to the data available for wind power assessments. Because of its simplicity, the power law profile has been one of the most popular mathematical formulations to predict the vertical wind shear. This paper presents an analysis of wind speed and wind shear in terms of the directional, diurnal and seasonal patterns for a site at the Autonomous University of Yucatan which experiences the tropical conditions of the Yucatan Peninsula in Mexico. This analysis takes a detailed look at frequency distributions to facilitate a comprehensive understanding of the local climatic conditions. Diurnal wind speed variations are shown to be affected in particular by the differing wind conditions associated with fetches over two distinct offshore regions. Seasonal behaviour suggests some departure from the oscillations expected from temperature variation. In addition, the use of rate of change of temperature at one height is proposed as an alternative to vertical temperature gradient inferred from two heights as an indicator of atmospheric stability which will affect the wind shear. The work presented is part of a regionally funded research program to evaluate the onshore and offshore wind potential in the north of the Yucatan Peninsula. K Ke ey yw wo or rd ds s:

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“…Average midday L was −128 m during Case 1 and L = −12 m during Case 2. These magnitudes correspond to forced convective conditions in Case 1 and strongly convective in Case 2 [22,64].…”

Section: Rotor-disk Wind Shearmentioning

confidence: 99%

Role of Surface Energy Exchange for Simulating Wind Turbine Inflow: A Case Study in the Southern Great Plains, USA

et al. 2014

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Abstract:The Weather Research and Forecasting (WRF) model is used to investigate choice of land surface model (LSM) on the near surface wind profile, including heights reached by multi-megawatt (MW) wind turbines. Simulations of wind profiles and surface energy fluxes were made using five LSMs of varying degrees of sophistication in dealing with soil-plant-atmosphere feedbacks for the Department of Energy (DOE) Southern Great Plains (SGP) Atmospheric Radiation Measurement Program (ARM) Central Facility in Oklahoma, USA. Surface flux and wind profile measurements were available for validation. WRF was run for three, two-week periods covering varying canopy and meteorological conditions. The LSMs predicted a wide range of energy flux and wind shear magnitudes even during the cool autumn period when we expected less variability. Simulations of energy fluxes varied in accuracy by model sophistication, whereby LSMs with very simple or no soil-plant-atmosphere feedbacks were the least accurate; however, the most complex models did not consistently produce more accurate results. Errors in wind shear were also sensitive to LSM choice and were partially related to energy flux accuracy. The variability of LSM performance was relatively high suggesting that LSM

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Evaluation of stability corrections in wind speed profiles over the North Sea

Cited by 62 publications

References 17 publications

Diabatic wind speed profiles in coastal regions: Comparison of an internal boundary layer (IBL) model with observations

Diabatic wind speed profiles in coastal regions: Comparison of an internal boundary layer (IBL) model with observations

Evaluation of the Wind Shear at a Site in the North-West of the Yucatan Peninsula, Mexico

Role of Surface Energy Exchange for Simulating Wind Turbine Inflow: A Case Study in the Southern Great Plains, USA

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