Characterization of the Atmospheric Boundary Layer in Complex Terrain and Results from the AMADEUS Dispersion Experiments PDF Download
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Author: David Fleming Brown
Publisher:
ISBN:
Category :
Languages : en
Pages : 312
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Author: David Fleming Brown
Publisher:
ISBN:
Category :
Languages : en
Pages : 312
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Author: D. F. Brown
Publisher:
ISBN:
Category :
Languages : en
Pages : 176
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Book Description
This report summarizes our analysis of the AMADEUS meteorological data Preliminary analysis (also given in Brown et al. 1990) of these data for each of the smoke-release periods include: (1) computation of averages of the surface-station and micrometeorological measurements (wind speed, wind direction, temperature), (2) stability characterization by analysis of bulk Richardson numbers and wind direction standard deviations, (3) examination of vertical heat and momentum fluxes from sonic-anemometer data, (4) analysis of spectra computed using 1-Hz micrometeorological data and (5) determination of boundary-layer height from the instrumented balloon soundings. Additional results given in this report include: (1) an analysis of vertical wind profiles, (2) comparisons of Meadowbrook data to similarity-based empirical relations and (3) a comprehensive analysis of the noctumal down-slope flows. The results show that the meteorological data are consistent, both internally and with other studies of the atmospheric boundary layer. The daytime convective conditions reveal a high degree of coherency, whereas the nighttime stable conditions are more spatially heterogeneous and less coherent. Analysis of surface-station data has shown that the characteristics of the nocturnal downslope flows in the Meadowbrook valleys are influenced by a combination of local cooling, local surface conditions and mesoscale drainage flows external to the Meadowbrook system. These data appear to offer significant potential for improving the state of dispersion modeling in this important area. RA 3, smoke, screening smoke, obscuring smoke, hexachloroethane, gas chromatography.
Author: Jens-Christopher Mayer
Publisher:
ISBN:
Category :
Languages : en
Pages : 86
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Author:
Publisher:
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Category : Science
Languages : en
Pages : 2022
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Author: Hadassah Kaplan
Publisher: Springer Science & Business Media
ISBN: 9400965141
Category : Science
Languages : en
Pages : 480
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Book Description
In this volume, we present the lectures given during the 1984 OHOLO Conference, held in Zichron Yaacov, Israel. The Conference was organized by the Israel Institute for Biological Research, Department of Mathematics, which is involved in Environmental Risk Evaluation, and in Projects Estimating the Potential of Wind Energy. The lectures cover a broad spectrum of mathematical models, ranging from those that deal with the solution of atmospheric conservation equations, and to those models that yield empirical estimates based on real time measure ments and thus are unique to the locale where measured. The goal of the Conference was to allow scientists from various countries to meet and discuss topics of mutual interest, including the following: 1. Structure of the boundary layer - primarily models dealing in the understanding of the various processes of atmospheric energy transfer, and their influence on the size and composition of the boundary 1 ayer. 2. Advanced mathematical techniques for describing flow and diffusion - lectures on approximations and techniques for solving the diffu sion and transport equations. 3. Flow over complex terrain - research into various aspects of the problem - mathematical models, physical models, experimental results. 4. Models of pollution transport and deposition.
Author: D. F. Brown
Publisher:
ISBN:
Category :
Languages : en
Pages : 142
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Book Description
This report summarizes the meteorological data collected as part of the AMADEUS dispersion experiments. In addition, a preliminary analysis of these data was carried out. Averages of the surface-station and micrometeorological measurements were computed for each of 12 smoke release periods. Also, the stability of the atmosphere during these tests was characterized by analyzing (1) the standard deviation of the horizontal wind direction; (2) the bulk Richardson number; (3) the vertical profiles of wind and atmospheric temperature; and (4) direct measurements of the vertical heat and momentum fluxes. For four of the five daytime releases, the height of the boundary layer was determined from instrumented balloon soundings. Results show that the meteorological data are complete and consistent, both internally and with other studies of the atmospheric boundary level. The daytime convective conditions reveal a high degree of coherency, whereas the nighttime stable conditions are more spatially heterogeneous and less coherent. The stable boundary layer is generally less well understood than is the convective boundary layer, especially in a complex terrain setting. The data appear to offer significant potential for improving the state of dispersion modeling in this important area.
Author: William Peter Kustas
Publisher:
ISBN:
Category : Boundary layer (Meteorology)
Languages : en
Pages : 336
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Author: Bruce A. Kunkel
Publisher:
ISBN:
Category : Atmospheric diffusion
Languages : en
Pages : 54
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Author:
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ISBN:
Category : Aeronautics
Languages : en
Pages : 1460
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Book Description
Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 48
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Book Description
The goal of this project is to improve our scientific understanding of dispersion issues over complex terrain and publish results in scientific journals. Three scientific articles and one student's Master thesis are under preparation based on the results supported by this project. The first paper, entitled "The role of advection of fluxes on modeling dispersion in convective boundary layers", is aimed at examining the importance of the advection terms for dispersion in a convective boundary layer. An Eulerian three-dimensional higher-order closure dispersion model is presented. The model uses mean wind and turbulence values from a second order atmospheric boundary layer model. The dispersion model is validated against results from tank and field experiments and compared to results from Lagrangian dispersion models. The results show good agreement with experiment and Lagrangian modeling results for point source dispersion in a convective boundary layer. Sensitivity studies of the model helped to identify the roles that advection and horizontal transport terms in the equations for the fluxes play in simulating the essential features of pollutant dispersion. The results from the sensitivity tests show that the famous features of dispersion from a point source in the convective boundary layer - with an ascending plume during ground level release and descending for a lifted point source - is caused by the advection term in the equation for the vertical flux. Furthermore, it is shown that there is a tendency for the plume to split horizontally, which is also caused by the advection term in horizontal fluxes.
