Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/89409
標題: Study on the effect of sand-fixed hedge
堆砂籬定砂功效之探討
作者: 邱盈達
Ying-Da Qiu
關鍵字: 飛砂量
堆砂籬
攔砂功效
風洞試驗
ammount of blown sand
sand-fixed hedge
retain sand efficiency
wind tunnel
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摘要: 堆砂籬於台灣沿海雖已被廣泛使用,然堆砂籬是否需要大面積全面鋪設,才能獲得最顯著功效;主籬與翼籬之間夾角應如何規劃,才能達到最佳化設計,至今尚無具體結果,為能深入探討本研究分為現地及風洞試驗,現地試驗以苑裡沿海為試區,架設 BSNE 垂直集砂器及多層風速計等進行觀測;風洞試驗則依翼籬長度與角度從事模型吹砂試驗。 由現地試驗結果得知,苑裡試區飛砂之中值粒徑為 0.19~0.27mm,砂粒密度為 2.55~2.7 g/cm3,砂面含水率為 1.0~5.5 %,經分析結果,其與飛砂量均呈負相關,飛砂量推估式為: ⎤⎡ 2 ⎥⎢ U 0.25 Q = ⎢14.4858 × () − 0.1208⎥ × d 50 × U 0.25 × σ σ ⎥⎢ g × d 50 × × w ⎥⎢ρ ⎦⎣ 堆砂籬於東北季風期間之攔砂量百分比為 87.62 %,平均單位面積(m2)之攔砂量為 8.71 m3,據此獲得在間距 10m,平均單位體積攔砂百分比(即攔砂功效)為 87.12 %;又砂丘地形最高點於東北季風過後幾乎沒有變化。再者,砂丘迎風面之攔砂功效高達 98.57 %,而背風面之攔砂功效為 74.92 %。 由風洞試驗結果發現,翼籬可因應不同風向而增加堆砂效果,至少 3 倍籬高以上時,定砂量開始增加;又翼籬與主籬之夾角對堆砂功效之高低依序為 22.5° > 45° > 90° > 0°。
The sand fixed hedge has been using at Taiwan's coastally, how is the best desing for different from angle between main hedge and wing hedge, it is still no results. In this study, there are two part of experiment that are field study and wind tunnel. The field study is analysis by BSNE sand sampler and multi-layer anemometer at Yuanli coastally, the wind tunnel experimental that study different length and angle of hedge. The result is show that the distribution of medium diameter from 0.19 to 0.27 mm, the density of sand from 2.55 to 2.7 g/cm3, the water content of sand from 1~5.5%, there is there is negative relationship with amount of Aeolian sand. The function of Aeolian sand is : ⎡⎤ 2 ⎢⎥ U 0.25 ) − 0.1208⎥ × d 50 × U 0.25 × σQ = ⎢14.4858 × ( σ ⎢⎥ g × d 50 × × w ⎢⎥ρ ⎣⎦ The sand-fixed hedge can fix Aeolian sand for 87.62% during the winter, the average distance by 1 m can fix Aeolian sand for 8.71m3, the top of sand dune is almost not to change by wind blown. In other hand, the sand dune is confer to windward side and leeward side. The effect of fix sand is 98.57% on windward sand dune, and the other is 74.92% on leeward sand dune.The wind tunnel result is show that there is fine result in 3 times sand-fixed hedge height for sand-fixed hedge length, there is different amount of aeolian sand by wing hedge angle with main hedge, in order is 22.5° > 45° > 90° > 0°.
URI: http://hdl.handle.net/11455/89409
其他識別: U0005-0807201514005900
文章公開時間: 2015-07-16
Appears in Collections:水土保持學系

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