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Title: Spatially averaging cross-wind sensors and numerical-model results for nocturnal drainage winds in complex terrain

Abstract

Recent studies in The Geysers region of Northern California have concentrated on drainage wind effects on tracer transport and diffusion in complex terrain, as part of the Atmospheric Studies in Complex Terrain (ASCOT) project. These studies combined tracer measurements, conventional tower and remote sensing meteorological measurements, and numerical wind field transport and diffusion models. One part of the meteorological measurement support used eight optical cross-path wind sensors across the principle air drainage valleys. These sensors had varying optical path lengths within the drainage layer of approx. 300 m to 3 km. Results of this study indicate that the combination of spatially averaged cross-path optical wind sensor and conventional tower mounted cup-vane anemometer data into a numerical plume transport and diffusion model for complex terrain has provided useful results. The most important of these results is an independent measure of wind data on a spatial scale compatible with necessarily large grid scales in numerical wind field models with topography. This allows assessment of terrain associated exposure problems for tower anemometers in complex terrain. The optical cross wind data can be used to compare necessary averaging times, and spatial distribution of point sensors and provide verification data to improve the logistics ofmore » instrument placement in combination with numerical models.« less

Authors:
;
Publication Date:
Research Org.:
Lawrence Livermore National Lab., CA (USA)
OSTI Identifier:
6567019
Report Number(s):
UCRL-87797; CONF-830307-2
ON: DE82021220
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Conference
Resource Relation:
Conference: 6. American Meteorological Society symposium on turbulence and diffusion, Boston, MA, USA, 22 Mar 1983; Other Information: Portions are illegible in microfiche products
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; AIR POLLUTION; ENVIRONMENTAL TRANSPORT; COMPLEX TERRAIN; METEOROLOGY; WIND; VELOCITY; ANEMOMETERS; COMPARATIVE EVALUATIONS; DIFFUSION; DRAINAGE; MATHEMATICAL MODELS; NOCTURNAL VARIATIONS; SPATIAL DISTRIBUTION; TRACER TECHNIQUES; DISTRIBUTION; ISOTOPE APPLICATIONS; MASS TRANSFER; MEASURING INSTRUMENTS; POLLUTION; VARIATIONS; 500100* - Environment, Atmospheric- Basic Studies- (-1989); 500200 - Environment, Atmospheric- Chemicals Monitoring & Transport- (-1989)

Citation Formats

Porch, W.M., and Lange, R. Spatially averaging cross-wind sensors and numerical-model results for nocturnal drainage winds in complex terrain. United States: N. p., 1982. Web.
Porch, W.M., & Lange, R. Spatially averaging cross-wind sensors and numerical-model results for nocturnal drainage winds in complex terrain. United States.
Porch, W.M., and Lange, R. Mon . "Spatially averaging cross-wind sensors and numerical-model results for nocturnal drainage winds in complex terrain". United States. doi:.
@article{osti_6567019,
title = {Spatially averaging cross-wind sensors and numerical-model results for nocturnal drainage winds in complex terrain},
author = {Porch, W.M. and Lange, R.},
abstractNote = {Recent studies in The Geysers region of Northern California have concentrated on drainage wind effects on tracer transport and diffusion in complex terrain, as part of the Atmospheric Studies in Complex Terrain (ASCOT) project. These studies combined tracer measurements, conventional tower and remote sensing meteorological measurements, and numerical wind field transport and diffusion models. One part of the meteorological measurement support used eight optical cross-path wind sensors across the principle air drainage valleys. These sensors had varying optical path lengths within the drainage layer of approx. 300 m to 3 km. Results of this study indicate that the combination of spatially averaged cross-path optical wind sensor and conventional tower mounted cup-vane anemometer data into a numerical plume transport and diffusion model for complex terrain has provided useful results. The most important of these results is an independent measure of wind data on a spatial scale compatible with necessarily large grid scales in numerical wind field models with topography. This allows assessment of terrain associated exposure problems for tower anemometers in complex terrain. The optical cross wind data can be used to compare necessary averaging times, and spatial distribution of point sensors and provide verification data to improve the logistics of instrument placement in combination with numerical models.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Nov 01 00:00:00 EST 1982},
month = {Mon Nov 01 00:00:00 EST 1982}
}

Conference:
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