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A STUDY OF NEAR SURFACE WIND PROFILES IN THE HEBEI COASTAL AREA BASED ON OBSERVATIONAL EXPERIMENTS
  Revised:November 06, 2018
KeyWords:wind profile  atmospheric stability classification  similarity theory  Monin-Obukhov length  local similarity theory
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Author NameAffiliationE-mail
GONG Xi 1. Nanjing University of Information Science and Technology, Nanjing 210044 China
2. China Academy of Meteorological Sciences, Beijing 100081 China 
 
ZHU Rong  rongzhu@cma.gov.cn 
LI Ze-chun   
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Abstract:
      In order to provide wind profiles for the microscale numerical simulation of wind farm with complex terrain, using the 100 m tower atmospheric turbulence observation experiment data in 2010 in Hebei Province offered by National Climate Center, the variation characteristics of wind profile under the different atmospheric stability conditions are analyzed, and the wind profile expression based on the local similarity theory is established. The results show that: (1)In spring, the occurrence probability of unstable stratification in the Hebei coastal area is as high as 28%, and the probability of stable stratification is more than 43% while, in summer, the probability of occurrence of unstable stratification is as high as 80% with a lower probability for stable stratification; and (2) for stable stratification, the characteristics of atmosphere change is dramatic in terms of the vertical direction, which need to be treated layer by layer. According to the atmospheric turbulence observation experiment data above, under stable stratification, the relationship between the dimensionless velocity gradient and the stability ζ can be expressed as 1 +βmζ, with βm changing with the height: βm takes 4.1-4.3 under 30 m, βm takes 4.6-4.7 between 30-50 m, and βm takes 6.3-6.7 over 50 m.
DOI:10.16555/j.1006-8775.2018.04.009
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