1,721,018 research outputs found
Comparison of PDFs closure schemes and turbulence parameterizations in Lagrangian stochastic models
No full textAtmospheric dispersion in non-homogeneous conditions simulation of a wind tunnel tracer experiment
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An intercomparison of two turbulence closure schemes and four parameterizations for stochastic dispersion models
Full text linkTwo Lagrangian particle models, developed by Luhar and Britter (Atmos. Environ., 23 (1989) 1191) and Weil (J. Atmos. Sci., 47 (1990) 501), satisfying the “well-mixed” condition as prescribed by Thomson (J. Fluid. Mech., 180 (1987) 529), are compared. They differ in the closure scheme used in calculating the probability density function of the random forcing in a convective boundary layer. Four different turbulent parameterizations were used as input to both models. Their performances are evaluated against one of the well-known Willis and Deardorff water tank experiments (Atmos. Environ., 12 (1978) 1305). Predicted and measured ground-level concentrations (g.l.c.), maximum g.l.c. distance, mean plume height and plume vertical spread are presented and discussed
Statistical analysis of three series of daily rainfall in North-Western Italy
Full text linkIn this work we study three long series of daily rainfall measured in North-Western Italy. We analyze the global statistical properties of the three data sets and we discuss both the seasonal distribution of rainfall intensity and the long-term variation in rainfall properties. We show that the three series display a
vanishingly small autocorrelation for periods longer than one or two days, consistent with the absence of multifractality in these records. These time series are largely consistent with the output of a simple
chain-dependent stochastic process
Comparison among empirical probability density functions of the vertical velocity in the surface layer based on higher order correlations
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