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題 名 | 臺東濱海區域番荔枝果園內簡易防風網後之氣流分布探討=Study on Airflow Variation at the Back of Nylon Windbreak Net for Sugar Apple Orchard in Seashore Region |
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作 者 | 唐琦; 張峻瑋; 申雍; 李炳和; 郭欣怡; 潘韋儒; | 書刊名 | 作物、環境與生物資訊 |
卷 期 | 3:3 民95.09 |
頁 次 | 頁275-284 |
分類號 | 435.344 |
關鍵詞 | 番荔枝; 防風網; 氣流; Sugar apple; Windbreak net; Airflow; |
語 文 | 中文(Chinese) |
中文摘要 | 摘要 本研究於2004 年7、10 月及2005 年3、 8 月等季風盛行期間,於臺東縣東河鄉濱海區 域擇一面積約為0.65 ha 之番荔枝果園為試 區,於其北及東側各設置42 及100 m 之簡易 尼龍防風網(高度5 m, φ = 1.2 mm, mesh = l cm),並由二側防風網各向內約25 m 處設置 觀測鐵塔,以觀測果園試區內離地面2.8、 3.8、5.3、7.3、10.3 m 處之風速及風向,另 於防風網東北隅方向外15 m 設置一距地面3 m 之風向風速計以為對照,期間共進行四次 調查,而番荔枝平均植冠高度為2.3 m。經分 析果園試區設置簡易尼龍防風網後之氣流分 布特性可知,氣流通過簡易尼龍防風網後之 行進方向會偏轉約±25°之方位角,且其全日 風速垂直變化仍符合隨高度遞增趨勢,而防 護高度約為1.4~1.6 倍防風網高度。 |
英文摘要 | ABSTRACT This study was conducted to measure the variations of wind speed and wind direction above the sugar apple canopy at the back of nylon windbreak net (5 m height, φ = 1.2 mm, mesh = l cm). The windbreak nets were set at northern and eastern sides 42 and 100 m, respectively, away from the orchard plot, located adjacent to the seashore of Dunghe Hsiang, Taitung Hsien (22°55′07′′ N, 120°15′02′′ E). The mean plant height of sugar apple tree was 2.3 m. There were four wind measurements conducted in July and October of 2004 and March and August of 2005. Five anemometers were mounted along the observational tower at the heights of 2.8, 3.8, 5.3, 7.3 and 10.3 m above ground surface. The observational tower was situated behind both sides of windbreak net in 25 m distance, and the wind speed and wind direction were collected for analysis. Results showed that airflow passed through the nylon windbreak net would result in an azimuth deviation within ±25° than original direction. Altitude gradient and wind speed was positively correlated all day, wind speed increased with increasing altitude. The mitigation effect of windbreak net from strong wind was about 1.4 to 1.6 times of its height. |
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