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UNIVERSITY OF BUCHAREST
FACULTY OF PHYSICS Guest
2024-11-22 2:25 |
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Conference: Bucharest University Faculty of Physics 2006 Meeting
Section: Atmosphere and Earth Science; Environment Protection
Title:
Three-dimensional wind field estimated in complex terrain
Authors:
G.Mocioaca
Affiliation:
University of Bucharest, Faculty of Physics, P.O.BOX MG-11, Bucharest, Romania
E-mail
george@agraro.ro
Keywords:
air pollution ,dispersion modelling,complex terrain
Abstract:
Air pollution dispersion modelling in complex terrain is dependent upon adequate modelling of the three dimensional wind fields. Several wind field models have been developed and tested. This paper presents the results of the application of two different wind field models for simulating the winds in a complex terrain area with coastlines, valleys and mountains.In this investigation for the simulation of winds we have applied one diagnostic and one prognostic wind field model which are currently being used at Norwegian Institute for Air Research (NILU) to estimate the atmospheric dispersion from local scale to mesoscale.The diagnostic wind field model, MATHEW, is based on interpolation of wind observations or assimilated data from mesoscale models. It is currently applied for providing wind field input for NILU developed dispersion model EPISODE. MATHEW is a modified version of the MATHEW model developed by Sherman.The second wind field model is incorporated in the meteorological module of the air pollution model (TAPM) developed at CSIRO in Australia. TAPM includes a prognostic numerical model that has been used as a “stand alone” model for the purpose of estimating the wind fields in our study area.The investigation revealed that both models reasonably predict the wind field in a complex modelling area, showing similar pattern in many cases. When mesoscale circulations occur, differences are mainly encountered during transition period from e.g., the onshore sea breeze to off shore land breeze and vice versa. Especially the TAPM model is not sensitive enough to reflect the sudden changes in wind directions observed at most meteorological sites.Simulations have been performed for one month (November 1999). Comparisons have been performed with wind observation in a large number of measurement locations covering the model area as well.
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