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This content will become publicly available on December 15, 2018

Title: Coastal Wind and Turbulence Observations during the Morning and Evening Transitions over Tropical Terrain

Data collected during a multiyear, wind-resource assessment over a multi-land-use coastal environment in Belize are used to study the development and decay of wind and turbulence through the morning and evening transitions. Observations were made on three tall masts, forming an inland transect of approximately 5 km. The wind distribution is found to be bimodal and governed by synoptic scales, with onshore and offshore flow regimes. The behavior between the coastal and inland sites is found to be very similar when the flow is directed offshore; for onshore flow, stark differences occur. The mean wind speed at the coastal site is approximately 20% greater than the most inland site and is nearly constant throughout the diurnal cycle. Furthermore, for both flow regimes, the influence of the land–sea breeze circulation is inconsequential relative to the large-scale synoptic forcing. Composite time series are used to study the evolution of sensible heat flux and turbulence kinetic energy (TKE) throughout the morning and evening transitions. The TKE budget reveals that at the coastal site mechanical production of TKE is much more important than buoyant production. This allows for the unexpected case in which TKE increases through the ET despite the decrease of buoyant TKEmore » production. Multiresolution flux decomposition is used to further study this phenomenon as well as the evolution of the sensible heat flux at differing time scales. We present an idealized schematic to illustrate the timing and structure of the morning and evening transitions for an inland site and a coastal site that are subjected to similar synoptic forcing.« less
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [2]
  1. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  2. Univ. of Utah, Salt Lake City, UT (United States). Dept. of Mechanical Engineering
  3. Univ. of Laval, Quebec City, QC (Canada). Dept. of Civil and Water Engineering
  4. Washakie Renewable Energy, Salt Lake City, UT (United States)
Publication Date:
Report Number(s):
LLNL-JRNL-727607
Journal ID: ISSN 1558-8424; TRN: US1801017
Grant/Contract Number:
AC52-07NA27344
Type:
Accepted Manuscript
Journal Name:
Journal of Applied Meteorology and Climatology
Additional Journal Information:
Journal Volume: 56; Journal Issue: 12; Journal ID: ISSN 1558-8424
Publisher:
American Meteorological Society
Research Org:
Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; 17 WIND ENERGY; complex terrain; atmosphere-land interaction; coastal flows; turbulence; diurnal effects; budgets
OSTI Identifier:
1417277
Alternate Identifier(s):
OSTI ID: 1413572