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題名 | 臺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 Coastal Area in Central Taiwan |
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作者 | 黃隆明; 陳天慈; 范姜明威; | 書刊名 | 水土保持學報 |
卷期 | 43:3 2011.09[民100.09] |
頁次 | 頁259-276 |
分類號 | 443.64 |
關鍵詞 | 飛砂; 揚塵; 風洞; Aeolian sand; Fugitive dust; Wind tunnel; |
語文 | 中文(Chinese) |
中文摘要 | 本研究選定大安溪、大甲溪及烏溪鄰近出海口處,飛砂及揚塵危害嚴重地點,從事 現地風速、風向、飛砂、揚塵(PM10)及風蝕量之觀測,並探討飛砂量與揚塵量之關 係;為彌補現地實驗之不足,再於室內風洞進行不同風速、含水率、砂粒粒徑與飛砂量 之觀測;綜合實驗結果顯示,大安溪、大甲溪與烏溪之PM10 分別為總體積5.8%、4.6% 與2.1%;而揚塵遞減率每公里分別約為75%、95%及70%。再者,砂粒粒徑介於0.25~ 0.84 mm 時,其起始風速為5.0~13.0 m/s;砂粒粒徑為0.25 mm 以下時,其起始風速為 4 m/s。又當砂粒含水率低於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。至於各河口飛砂量與揚塵量之關係分別為:大安溪:Q' 102.22Q 1.05 、大甲溪: Q' 50.705Q 1.57 及烏溪:Q' 85.608Q 1.17 。 |
英文摘要 | This study conducted on-site observation of wind speed, wind direction, aeolian sand, fugitive dust (PM10) and wind erosion at the locations with severe hazard of aeolian sand and fugitive dust near the estuaries of the chosen Da-an River, Dajia River and Wu River, and examined the correlation between the amount of aeolian sand and fugitive dust. To offset the insufficiency in site experiment, further observation was made on various wind speed, watercontent, sand particle size and the amount of aeolian sand in the indoor wind tunnel. The experiment results, when summarized, indicated that PM10 at Da-an River, Dajia River and Wu River were 5.8%, 4.6% and 2.1%, respectively, of the total volume; and fugitive dust decrease rates per kilometer were 75%, 95% and 70%, respectively. Also, when the sand particle size was in the range of 0.25-0.84 mm, the starting wind speed was 5.0-13.0 m/s; while the sand particle size was under 0.25 mm, the starting wind speed was 4 m/s. when water content in the sand was lower than 0.52%, aeolian sand reached peak value; when water content gradually decreased from 0.77% to 1.70%, aeolian sand decreased sharply, and when water content reached 3.40%, the inhibition to sand starting reached the maximum. The correlations between the amount of aeolian sand and fugitive dust at the estuaries were: Da-an River, Dajia River and Wu River were Q' 102.22Q1.05 , Q' 50.705Q 1.57 and Q' 85.608Q 1.17 . |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。