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    The Iowa Atmospheric Observatory: Revealing the Unique Boundary Layer Characteristics of a Wind Farm

    Source: Earth Interactions:;2019:;volume 023:;issue 002::page 1
    Author:
    Takle, Eugene S.
    ,
    Rajewski, Daniel A.
    ,
    Purdy, Samantha L.
    DOI: 10.1175/EI-D-17-0024.1
    Publisher: American Meteorological Society
    Abstract: AbstractThe Iowa Atmospheric Observatory was established to better understand the unique microclimate characteristics of a wind farm. The facility consists of a pair of 120-m towers identically instrumented to observe basic landscape?atmosphere interactions in a highly managed agricultural landscape. The towers, one within and one outside of a utility-scale low-density-array wind farm, are equipped to measure vertical profiles of temperature, wind, moisture, and pressure and can host specialized sensors for a wide range of environmental conditions. Tower measurements during the 2016 growing season demonstrate the ability to distinguish microclimate differences created by single or multiple turbines from natural conditions over homogeneous agricultural fields. Microclimate differences between the two towers are reported as contrasts in normalized wind speed, normalized turbulence intensity, potential temperature, and water vapor mixing ratio. Differences are analyzed according to conditions of no wind farm influence (i.e., no wake) versus wind farm influence (i.e., waked flow) with distance downwind from a single wind turbine or a large group of turbines. Differences are also determined for more specific atmospheric conditions according to thermal stratification. Results demonstrate agreement with most, but not all, currently available numerical flow-field simulations of large wind farm arrays and of individual turbines. In particular, the well-documented higher nighttime surface temperature in wind farms is examined in vertical profiles that confirm this effect to be a ?suppression of cooling? rather than a warming process. A summary is provided of how the wind farm boundary layer differs from the natural boundary layer derived from concurrent measurements over the summer of 2016.
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      The Iowa Atmospheric Observatory: Revealing the Unique Boundary Layer Characteristics of a Wind Farm

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    http://yetl.yabesh.ir/yetl1/handle/yetl/4263021
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    contributor authorTakle, Eugene S.
    contributor authorRajewski, Daniel A.
    contributor authorPurdy, Samantha L.
    date accessioned2019-10-05T06:39:47Z
    date available2019-10-05T06:39:47Z
    date copyright1/25/2019 12:00:00 AM
    date issued2019
    identifier otherEI-D-17-0024.1.pdf
    identifier urihttp://yetl.yabesh.ir/yetl1/handle/yetl/4263021
    description abstractAbstractThe Iowa Atmospheric Observatory was established to better understand the unique microclimate characteristics of a wind farm. The facility consists of a pair of 120-m towers identically instrumented to observe basic landscape?atmosphere interactions in a highly managed agricultural landscape. The towers, one within and one outside of a utility-scale low-density-array wind farm, are equipped to measure vertical profiles of temperature, wind, moisture, and pressure and can host specialized sensors for a wide range of environmental conditions. Tower measurements during the 2016 growing season demonstrate the ability to distinguish microclimate differences created by single or multiple turbines from natural conditions over homogeneous agricultural fields. Microclimate differences between the two towers are reported as contrasts in normalized wind speed, normalized turbulence intensity, potential temperature, and water vapor mixing ratio. Differences are analyzed according to conditions of no wind farm influence (i.e., no wake) versus wind farm influence (i.e., waked flow) with distance downwind from a single wind turbine or a large group of turbines. Differences are also determined for more specific atmospheric conditions according to thermal stratification. Results demonstrate agreement with most, but not all, currently available numerical flow-field simulations of large wind farm arrays and of individual turbines. In particular, the well-documented higher nighttime surface temperature in wind farms is examined in vertical profiles that confirm this effect to be a ?suppression of cooling? rather than a warming process. A summary is provided of how the wind farm boundary layer differs from the natural boundary layer derived from concurrent measurements over the summer of 2016.
    publisherAmerican Meteorological Society
    titleThe Iowa Atmospheric Observatory: Revealing the Unique Boundary Layer Characteristics of a Wind Farm
    typeJournal Paper
    journal volume23
    journal issue2
    journal titleEarth Interactions
    identifier doi10.1175/EI-D-17-0024.1
    journal fristpage1
    journal lastpage27
    treeEarth Interactions:;2019:;volume 023:;issue 002
    contenttypeFulltext
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