碩士 / 中興大學 / 水土保持學系所 / 99 / This paper selected the downstream reach of Da-An River, Da-Jang River and Wu River as a study area and performed a numerical simulation on the dispersion behavior of fugitive dust released from the bare lands of riverbed using an air quality model (Fugitive Dust Model, FDM). Integrating the topographic information and meteorological data with the relationship curve between fugitive dust emission rate and wind velocity from the laboratory wind tunnel tests, one can simulate the dispersion potential of fugitive dust of Da-An River, Da-Jang River and Wu River. Meanwhile, the distribution of annual average PM10 concentration of simulations which processed by the geographic information system ArcGIS were compared with those of observations to verify the suitability of the numerical model and the associated input model parameters. In addition, according to the simulation results, one can evaluate the fugitive dust contributions from the bare lands of different reaches at downstream to the nearby sensitive areas or communities and the influence of the emission rate on the dispersion behavior of fugitive dust. For atmospheric stability, mixing height, surface roughness length and the characteristic particle diameter, sensitivity analyses of FDM with these parameters was assessed, and the result showed that it is apparent variation with the parameters except mixing height. The numerical results also indicated that the fugitive dust concentration at leeward will turn into higher when the wind direction is perpendicular to the downstream reach and the concentration will greatly ascend with the increasing emission rate. At last, the simulation results of the fugitive dust potential of riverbed can be implemented as a reference to the planning of preventive strategy and the configuration of countermeasure for fugitive dust control.
| Identifer | oai:union.ndltd.org:TW/099NCHU5080081 |
| Date | January 2011 |
| Creators | Yu-Lin Liu, 劉昱麟 |
| Contributors | 林德貴 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 101 |
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