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A simple and efficient procedure for the numerical simulation of wind fields in complex terrain
Authors:Massimiliano Burlando  Luigi Carassale  Emilia Georgieva  Corrado F Ratto  Giovanni Solari
Institution:(1) Department of Physics, University of Genoa, Via Dodecaneso 33, 16146 Genoa, Italy;(2) Department of Civil, Environmental and Architectural Engineering, University of Genoa, Via Montallegro 1, 16145 Genoa, Italy;(3) Institute of Geophysics, Bulgarian Academy of Sciences, Sofia, Bulgaria
Abstract:In spite of recent progress in the prognostic numerical simulation of the atmospheric boundary layer, the explicit simulation of turbulent flows in actual complex terrain is generally still very complicated and time consuming for many environmental applications. In an attempt to develop simpler and more efficient application oriented techniques, although less refined, we propose a multi-step procedure for simulating wind fields. Once obtained the necessary meteorological input, the mass-consistent modelling technique is used to perform high-resolution mean wind flow simulations taking into account recent developments in the atmospheric boundary-layer theory. Besides, a procedure based on a generalisation of the local logarithmic law-of-the-wall over complex terrain is used to estimate the effective parameters characterising the simulated wind profiles. Turbulence intensities and spectral properties are then calculated through the estimated effective parameters, in particular through the effective friction velocity parameter. Finally, time series of the instantaneous velocity field are simulated by the Monte Carlo technique. Two applications of the proposed approach are discussed briefly: the first one is related to a coastal area in southern Italy (the Messina Straits), where the construction of the world’s longest central span bridge is being planned; the second one corresponds to the flow in a mountainous area in northern Italy (the Albenga Airport).
Keywords:Boundary-layer flow simulation  Complex terrain  Local log law-of-the-wall  Monte Carlo methods  Proper Orthogonal Decomposition  Turbulence simulation
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