| Summary: | 碩士 === 國立中興大學 === 水土保持學系所 === 96 === 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 :(公式略)
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°.
|
|---|
