| Summary: | 碩士 === 國立臺灣海洋大學 === 河海工程學系 === 100 === In this thesis, the atmospheric environmental wind tunnel was employed to investgate the dispersion characteristics for different elevated point source dischargs interaction with three same prismatic buildings arranged in different triangular shapes.
In the present experiments, elevated sources were with height of “0H” and “0.5H” . Here “H” is the hight of building models. The prismatic building model used in the experiment was with length “0.5H” , width “0.5H” , and hight “1H”. The gaps between the buildings arranged in triangular shape were “0.5H” and “1H” . There are totally 16 runs in the experiment.The measurement results of the concentration fields are summarized as follows：
1.The measured concentration distributions for flat terrain (without building models) are found in agreement with the theoretical results of the Gaussian Diffusion Model.
2.If we build up buildings in the flat terrain, the centroid of concentration plume will be raised up by wind around the area of groups of buildings.
3.If we build up buildings in the flat terrain, Concentration Spreaded vertically between the range of ground and the height of 1.5H；Concentration Spreaded horizontally between the range of “ 1.25H ” and “ -1.25H ” .
4.When three buildings are arranged in “Positive Trigonometry” shape, the variation of vertical dispersion length scale is more than that of arranged in “Inverse Trigonometry” shape.
5.If the three buildings are arranged in “Inverse Trigonal” share, the spread of concentration around the region surround by three buildings is better than that of arranged in “Positive Trigonometry” .
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