Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/34936
標題: 台灣中部河口飛砂及揚塵之調查與研究
Investigation and Study of Aeolian Sand and Fugitive dust on the Estuaries in Central Taiwan
作者: 范姜明威
Fanjiang, Ming-Wei
關鍵字: Aeolian sand
飛砂
Fugitive dust
Wind tunnel
揚塵
風洞
出版社: 水土保持學系所
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摘要: 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.
本研究之目的為瞭解砂粒之移動機制,因而從事現地與風洞不同砂粒粒徑、風速與含水率及不同揚塵粒徑、風速與高度之觀測,實驗用砂取自於大安溪、大甲溪及烏溪濱海地區。砂粒粒徑分析結果:大安溪土壤之質地為壤質砂土、大甲及烏溪為砂土,其密度介於2.44至2.67 g/cm3之間,而砂粒含水率皆在1%以下;大安溪揚塵量PM10約佔單位體積5.8%,而大甲溪與烏溪約佔單位體積4.6%、2.1%。 現地觀測結果:大安溪現地風速為6.5 m/s時,風蝕量約為19,790 ton/ha/季、大甲溪現地風速為6.8 m/s時,風蝕量約為21,900 ton/ha/季、烏溪現地風速為8.5 m/s時,風蝕量約為33,580 ton/ha/季。再者經由多層風速計配合集砂器,經由迴歸分析,獲得大安溪飛砂量推估式為: 風洞實驗結果:砂粒粒徑介於0.25~0.84 mm時,其起始風速為5.0~7.0 m/s,又粒徑在0.25 mm以下之砂粒,其起始風速為4 m/s;當砂粒含水率低於0.52%時,飛砂量達到最大值,含水率由0.77%遞增至1.70%時,飛砂量急遽遞減,而含水率達3.40%時,對砂粒起動之抑制作用達到最大值;另外獲得飛砂量與揚塵量、不同高度揚塵量及不同揚塵粒徑與風速之推估式。所得成果可作為爾後飛砂揚塵防治規劃設計之參考依據。
URI: http://hdl.handle.net/11455/34936
其他識別: U0005-2008201012055600
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