The airflow model for complex terrain in Taiwan:analysis and improvement for the blocking effect
Date Issued
2010
Date
2010
Author(s)
Guo, Tai-Jiun
Abstract
In this research, by using variational analysis to build three-dimensional wind field in Taiwan。Before the variational analysist, the initial guess of Objective analysis, seriously affected the quality of variational analysis. For the interpolation of Objective analysis. If interpolation surface station data and sounding station data at same time.It will show the wrong air wind speed and wind direction. This study interpolation sounding station data and Enlarges the weight values at first. Finlly , by using power law to interpolation surface station data. It can correct wind speed and wind direction.
As the Taiwan complex terrain, the wind will change flow direction from terrain.
The atmospheric stability is to determine how the terrain effects the behavior of airflow important condition. In the stability case, the airflow will be smaller vertical displacement. For the the unstable case. The airflow is easy to affected by terrain effect that will increase the instability of the atmosphere and the resulting increase convection effect.To add the wind modified module represents sufficient influence of the complex terrain area.
In this study, using Stringer theory to adjust wind direction by wind modified module . The results show that the variational analysis can fully show the topographic effect and the near surface wind field.
This study will focus on the south central region and the south area using forward trajectory to analyze the ozone problem. The results show that two-dimension and three-dimensional trajectory analyisi are similar. From EPA station data found when high ozone concentration in the Chiayi and Pingtung . The trajectory that form Yunlin industrial zone will go through Chiayi and stay in Chiayi at night when wind speed is relatively small , It is cause of the the high concentration of ozone formation by photochemical reaction on the next day. For the Kaohsiung industrial zone, The trajectory will go through the Pingtung area, resulting high ozone concentration in the Pingtung, It is will stay in the Pingtung area at night. causing the high concentration of ozone formation by photochemical reaction on the next day. From forward trajectory simulation results, show that the ozone pollution problem is related to the industrial emissions pollutant.
Subjects
variational analysis
objective analysis
wind modified module
forward trajectory
Type
thesis
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