The Study of CALPUFF Model Application To Terrain and Building Downwash Effects
Date Issued
2007
Date
2007
Author(s)
Chen, Wei-Ming
DOI
zh-TW
Abstract
In order to know the complex terrain effects and building downwash effects, ISC model and CALPUFF model both are the main simulating tools for this research. Combining these two effects with different atmospheric stabilities and mixing layer heights, the maximum concentrations and distribution patterns are demonstrated in the graphs
First of all, by comparing the basis of two air quality models, the differences can be understood. The wind fields are not similar in two models. In ISC, the wind velocity and wind direction is unique in each hour. In CALPUFF, the wind field is modified by the input of surface meteorological stations and upper air stations. Second, these are four cases be tested, which are the flat terrain, ideal terrain, flat terrain with building downwash, and ideal terrain with building downwash. The point source of each case is separately simulated as located at the downwind or upwind of terrain and building. The outcome is found that when the source is located the upwind of the ideal terrain, the impingement concentration is much larger in ISC model. The building orientation would only influence the concentration pattern in PRIME method, rather than in Schulman-Scire/Huber-Snyder method. Finally, allowable pollutant increase limits (APIL) are tested. Under the circumstances of the emission of sulfur oxide limited to sixty tons per year and on the stack height of thirty-five meter, by means of ISC tested on the flat terrain, the amount of concentration is less than law standard and as well as by the means of CALPUFF tested on the flat terrain and ideal terrain. However, the others failed. The conclusion is that if CALPUFF model is introduced into the preferred air quality models, the terrain effect and building downwash effects should be taken consideration into the allowable pollutant increase limits and law standard.
Subjects
CALPUFF
ISC
建築物下洗
複雜地形效應
Building Downwash
Complex Terrain
SDGs
Type
thesis
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