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Title: Evaluation of single and multiple Doppler lidar techniques to measure complex flow during the XPIA field campaign

Accurate three-dimensional information of wind flow fields can be an important tool in not only visualizing complex flow but also understanding the underlying physical processes and improving flow modeling. However, a thorough analysis of the measurement uncertainties is required to properly interpret results. The XPIA (eXperimental Planetary boundary layer Instrumentation Assessment) field campaign conducted at the Boulder Atmospheric Observatory (BAO) in Erie, CO, from 2 March to 31 May 2015 brought together a large suite of in situ and remote sensing measurement platforms to evaluate complex flow measurement strategies. In this paper, measurement uncertainties for different single and multi-Doppler strategies using simple scan geometries (conical, vertical plane and staring) are investigated. The tradeoffs (such as time–space resolution vs. spatial coverage) among the different measurement techniques are evaluated using co-located measurements made near the BAO tower. Sensitivity of the single-/multi-Doppler measurement uncertainties to averaging period are investigated using the sonic anemometers installed on the BAO tower as the standard reference. Finally, the radiometer measurements are used to partition the measurement periods as a function of atmospheric stability to determine their effect on measurement uncertainty. It was found that with an increase in spatial coverage and measurement complexity, the uncertainty in the wind measurement alsomore » increased. For multi-Doppler techniques, the increase in uncertainty for temporally uncoordinated measurements is possibly due to requiring additional assumptions of stationarity along with horizontal homogeneity and less representative line-of-sight velocity statistics. Lastly, it was also found that wind speed measurement uncertainty was lower during stable conditions compared to unstable conditions.« less
Authors:
 [1] ;  [2] ;  [2] ;  [1] ;  [1] ;  [1] ;  [3] ;  [4] ;  [5] ;  [5] ;  [5] ;  [1] ;  [2] ;  [6] ;  [2]
  1. Cooperative Institute for Research in Environmental Sciences, Boulder, CO (United States); National Oceanic and Atmospheric Administration, Boulder, CO (United States)
  2. National Oceanic and Atmospheric Administration, Boulder, CO (United States)
  3. Univ. of Colorado, Boulder, CO (United States); National Renewable Energy Lab. (NREL), Golden, CO (United States)
  4. Univ. of Maryland Baltimore County (UMBC), Baltimore, MD (United States)
  5. Univ. of Texas at Dallas, Richardson, TX (United States)
  6. National Center for Atmospheric Research, Boulder, CO (United States)
Publication Date:
Report Number(s):
NREL/JA-5000-67999
Journal ID: ISSN 1867-8548
Grant/Contract Number:
AC36-08GO28308; SC0011561
Type:
Published Article
Journal Name:
Atmospheric Measurement Techniques (Online)
Additional Journal Information:
Journal Name: Atmospheric Measurement Techniques (Online); Journal Volume: 10; Journal Issue: 1; Journal ID: ISSN 1867-8548
Publisher:
European Geosciences Union
Research Org:
National Renewable Energy Lab. (NREL), Golden, CO (United States)
Sponsoring Org:
USDOE Office of Energy Efficiency and Renewable Energy (EERE)
Country of Publication:
United States
Language:
English
Subject:
17 WIND ENERGY; eXperimental Planetary boundary layer Instrumentation Assessment; XPIA; wind flow fields; flow modeling
OSTI Identifier:
1341344
Alternate Identifier(s):
OSTI ID: 1344326

Choukulkar, Aditya, Brewer, W. Alan, Sandberg, Scott P., Weickmann, Ann, Bonin, Timothy A., Hardesty, R. Michael, Lundquist, Julie K., Delgado, Ruben, Iungo, G. Valerio, Ashton, Ryan, Debnath, Mithu, Bianco, Laura, Wilczak, James M., Oncley, Steven, and Wolfe, Daniel. Evaluation of single and multiple Doppler lidar techniques to measure complex flow during the XPIA field campaign. United States: N. p., Web. doi:10.5194/amt-10-247-2017.
Choukulkar, Aditya, Brewer, W. Alan, Sandberg, Scott P., Weickmann, Ann, Bonin, Timothy A., Hardesty, R. Michael, Lundquist, Julie K., Delgado, Ruben, Iungo, G. Valerio, Ashton, Ryan, Debnath, Mithu, Bianco, Laura, Wilczak, James M., Oncley, Steven, & Wolfe, Daniel. Evaluation of single and multiple Doppler lidar techniques to measure complex flow during the XPIA field campaign. United States. doi:10.5194/amt-10-247-2017.
Choukulkar, Aditya, Brewer, W. Alan, Sandberg, Scott P., Weickmann, Ann, Bonin, Timothy A., Hardesty, R. Michael, Lundquist, Julie K., Delgado, Ruben, Iungo, G. Valerio, Ashton, Ryan, Debnath, Mithu, Bianco, Laura, Wilczak, James M., Oncley, Steven, and Wolfe, Daniel. 2017. "Evaluation of single and multiple Doppler lidar techniques to measure complex flow during the XPIA field campaign". United States. doi:10.5194/amt-10-247-2017.
@article{osti_1341344,
title = {Evaluation of single and multiple Doppler lidar techniques to measure complex flow during the XPIA field campaign},
author = {Choukulkar, Aditya and Brewer, W. Alan and Sandberg, Scott P. and Weickmann, Ann and Bonin, Timothy A. and Hardesty, R. Michael and Lundquist, Julie K. and Delgado, Ruben and Iungo, G. Valerio and Ashton, Ryan and Debnath, Mithu and Bianco, Laura and Wilczak, James M. and Oncley, Steven and Wolfe, Daniel},
abstractNote = {Accurate three-dimensional information of wind flow fields can be an important tool in not only visualizing complex flow but also understanding the underlying physical processes and improving flow modeling. However, a thorough analysis of the measurement uncertainties is required to properly interpret results. The XPIA (eXperimental Planetary boundary layer Instrumentation Assessment) field campaign conducted at the Boulder Atmospheric Observatory (BAO) in Erie, CO, from 2 March to 31 May 2015 brought together a large suite of in situ and remote sensing measurement platforms to evaluate complex flow measurement strategies. In this paper, measurement uncertainties for different single and multi-Doppler strategies using simple scan geometries (conical, vertical plane and staring) are investigated. The tradeoffs (such as time–space resolution vs. spatial coverage) among the different measurement techniques are evaluated using co-located measurements made near the BAO tower. Sensitivity of the single-/multi-Doppler measurement uncertainties to averaging period are investigated using the sonic anemometers installed on the BAO tower as the standard reference. Finally, the radiometer measurements are used to partition the measurement periods as a function of atmospheric stability to determine their effect on measurement uncertainty. It was found that with an increase in spatial coverage and measurement complexity, the uncertainty in the wind measurement also increased. For multi-Doppler techniques, the increase in uncertainty for temporally uncoordinated measurements is possibly due to requiring additional assumptions of stationarity along with horizontal homogeneity and less representative line-of-sight velocity statistics. Lastly, it was also found that wind speed measurement uncertainty was lower during stable conditions compared to unstable conditions.},
doi = {10.5194/amt-10-247-2017},
journal = {Atmospheric Measurement Techniques (Online)},
number = 1,
volume = 10,
place = {United States},
year = {2017},
month = {1}
}