碩士 / 國立中興大學 / 水土保持學系所 / 98 / The purpose of this study is appreciate the movement mechanism of sand so that it can conduct observation of particle diameter of sand, wind speed, and moisture content between current site and wind tunnel and that of particle diameter of diverse fugitive dust, wind speed, and height. The experiment will extract sand from Da-an Stream, Da-jia Stream, and costal area of Wu Stream. As indicated from analyzed results of particle diameter of sand, the soil quality from that of Da-an Stream is of loamy sand, while that from Da-jia Stream and Wu Stream is of sandy oil, and their density lies in between 2.44 to 2.67 g/cm3; as for moisture content, all are measured under 1%. The amount of fugitive dust measures about PM10, amounting to unit size as 5.8%, whereas the unit size of Da-jia Stream and Wu Stream amounts to 4.6% and 2.1%. As for observation at current site, it is found that the amount of wind erosion at Da-an Stream measures about 19,790 ton/ha-season, that of Da-jia Stream measures about 21,900 ton/ha-season, and that of Wu Stream measures about 33,580 ton/ha-season. In addition, the estimation formula of sand amount is obtained for Da-an Stream with the working of multi-anemometer and sand collection after being analyzed with linear regression:
As learned from experiment results of wind tunnel, when the particle diameter of sand lies between 0.25～0.84, its initiating wind speed will be 5.0～7.0 m/s, while particle diameter lies under 0.25 mm its initiating wind speed will be 4 m/s. On the other hand, when moisture content is lower than 0.52%, its amount of Aeolian sand should reach the greatest value; when moisture content is gradually increasing from 0.77% to 1.70% its amount of Aeolian sand drastically reduce. When moisture content reaches 3.40%, it will achieve greatest value for exertion of greatest suppression against initiating sand. Furthermore, the estimation formula for fugitive dust and Aeolian sand, fugitive sand of diverse heights, and diverse particle diameter of fugitive dust and wind speed are obtained, and the accomplishments derived can be taken as basis of reference for subsequent planning and design in the prevention and Aeolian sand and fugitive dust.
| Identifer | oai:union.ndltd.org:TW/098NCHU5080042 |
| Date | January 2010 |
| Creators | Ming-Wei Fanjiang, 范姜明威 |
| Contributors | Long-Ming Huang, 黃隆明 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 110 |
Page generated in 0.0071 seconds