Journal ArticleDOI
Criteria for the selection of stochastic models of particle trajectories in turbulent flows
TLDR
In this paper, the relationships between the various criteria are examined for a very general class of models and it is shown that most of the criteria are equivalent and also how a model can be designed to satisfy these criteria exactly and to be consistent with inertial-subrange theory.Abstract:
Many different random-walk models of dispersion in inhomogeneous or unsteady turbulence have been proposed and several criteria have emerged to distinguish good models from bad. In this paper the relationships between the various criteria are examined for a very general class of models and it is shown that most of the criteria are equivalent. It is also shown how a model can be designed to satisfy these criteria exactly and to be consistent with inertial-subrange theory. Some examples of models that obey the criteria are described. As an illustration some calculations of dispersion in free-convective conditions are presented.read more
Citations
More filters
Journal ArticleDOI
An Analytical one-Dimensional Second-Order Closure Model of Turbulence Statistics and the Lagrangian Time Scale Within and Above Plant Canopies of Arbitrary Structure
William J. Massman,Jeffrey Weil +1 more
TL;DR: In this article, an analytical second-order closure model is developed to describe the within canopy velocity variances, turbulent intensities, dissipation rates, Lagrangian time scale and Lagrangians far field diffusivities for vegetation canopies of arbitrary structure and density.
Journal ArticleDOI
Effect of thinning on surface fluxes in a boreal forest
Timo Vesala,Tanja Suni,Üllar Rannik,Petri Keronen,Tiina Markkanen,Sanna Sevanto,Tiia Grönholm,Sampo Smolander,Markku Kulmala,Hannu Ilvesniemi,R Ojansuu,Antti Uotila,Janne Levula,Annikki Mäkelä,Jukka Pumpanen,Pasi Kolari,Liisa Kulmala,Nuria Altimir,Frank Berninger,Eero Nikinmaa,Pertti Hari +20 more
TL;DR: In this paper, the authors show that thinning decreases the deposition velocities of fine particles as expected but does not reduce the carbon sink, water vapor flux, or ozone deposition.
Journal ArticleDOI
Mechanistic models of seed dispersal by wind
Ran Nathan,Gabriel G. Katul,Gabriel G. Katul,Gil Bohrer,Anna Kuparinen,Merel B. Soons,Sally E. Thompson,Ana Trakhtenbrot,Henry S. Horn +8 more
TL;DR: In this paper, various mechanistic models have been developed to estimate the magnitude of seed dispersal by wind, and to elucidate the relative importance of physical and biological factors affecting this passive transport process.
Journal ArticleDOI
Validation of the UK Met. Office’s name model against the ETEX dataset
DB Ryall,R.H. Maryon +1 more
TL;DR: The ETEX 1 data set has been used to assess the performance of the UK Met Office's long-range dispersion model NAME as mentioned in this paper, which performed well, successfully predicting the overall spread and timing of the plume across Europe.
Journal ArticleDOI
An aerobiological framework for assessing cross-pollination in maize
TL;DR: An aerobiological framework for assessing corn pollen movement in the atmosphere is presented that could also be applied to other crops and to uncultivated species and is presented as a multidisciplinary albeit incomplete perspective to an emerging applied problem.
References
More filters
Journal ArticleDOI
An Introduction to Probability Theory and Its Applications.
Journal ArticleDOI
Turbulence Structure in the Convective Boundary Layer
TL;DR: In this paper, a boundary layer experiment conducted over a flat site in northwestern Minnesota is discussed, where wind and temperature fluctuations near the ground were measured with AFCRL's fast-response instrumentation on a 32 m tower with MRU probes attached at five different heights to the tethering cable of a 1300 m2 kite balloon.
Book
Theory and Applications of Stochastic Differential Equations
Zeev Schuss,Robert O'Malley +1 more
TL;DR: Presents theory, sources, and applications of stochastic differential equations of Ito's type; those containing white noise; and the role of partial differential equations in this context.