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
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Journal ArticleDOI
Effect of clearcuts on footprints and flux measurements above a forest canopy
TL;DR: In this paper, the influence of a model bare soil patch located upwind of the eddy-covariance tower on fluxes in a managed forest plantation was examined.
Journal ArticleDOI
Quantifying maize pollen movement in a maize canopy
TL;DR: In this article, the Lagrangian stochastic simulation model was used to estimate the average release rate of maize pollen grains per area of crop, Q (grainsm −2 ǫs −1 ) were deduced by comparing measured and modeled values of C.
Journal ArticleDOI
Experimental analysis of flux footprint for varying stability conditions in an alpine meadow
TL;DR: In this article, the authors used eddy-covariance measurements, which were performed in the summer 2003 in an alpine grassland site, to determine the footprint of CO 2 turbulent fluxes and to investigate its dependence on stability.
Journal ArticleDOI
Experimental validation of footprint models for eddy covariance CO2 flux measurements above grassland by means of natural and artificial tracers
Nicola Arriga,Nicola Arriga,Üllar Rannik,Marc Aubinet,Arnaud Carrara,Timo Vesala,Dario Papale,Dario Papale +7 more
TL;DR: In this article, two different experimental tests have been conducted with the aim of offering validation: a manipulation of the vegetation cover and an artificial tracer emission, and the experimental data show a good agreement with footprint models and indicate a limited extension of the flux source area, with approximately 75% of the sources confined within a range of 10-20 times the effective measurement height.
Journal ArticleDOI
A new Lagrangian particle model for the simulation of dense gas dispersion
TL;DR: In this article, a Lagrangian stochastic model (MicroSpray) was modified to simulate the dispersion of dense gas clouds in complex terrain and in presence of obstacles, by taking into account the following processes: negative buoyancy, gravity spreading and the particle's reflection at the bottom computational boundary.
References
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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.