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|關鍵字:||The mechanism of sand movement|
Aeolian sand amount
|摘要:||This study was to explore the mechanism of Aeolian sand wind erosion. By the wind tunnel experiment, we tried to find out the Aeolian sand characteristics including density, diameter, texture, water content, shape etc. and the relationships between wind erosion amount and primary specific site characteristics of sand diameter, wind speed and water content. The study sites located at the near coast area around Houlong, Yuanli, Da-an and Da-jia in the central part of Taiwan. The densities were in the range of 2.62 and 2.67 g/cm^3 and the particle size distribution mainly ranged in 0.25-0.42 mm. Since the sand content was over 96% of all the samples, the soil texture was recognized as sandy soil by USDA soil classification. The water contents of all the samples were less than 1%: the highest highest observation of 0.967% in Houlong and the lowest one of 0.282% in Da-jia. After the shape analysis, Da-an sample was identified as sphere, Da-jia as flat shape and the others were between. According to the results of wind tunnel, the starting wind speeds of erosion in different diameters were as follows: 5.5-7.0 m/s of 0.15-0.84 mm and 5.0 m/s of <0.15 mm. Furthermore, when the water content below 1.22%, we had the maximum amount of wind erosion. The further study showed Aeolian wind erosion amount would be decreased from 1.22% to 1.84% and the minimum amount was exhibited of 1.84%. This study not only to demonstrate the severe wind erosion in the area but also concluded and identified several important mechanism characteristics of Aeolian sand erosion. We hope the knowledge and the research method could help our government to the urgent preventive contingency process of Aeolian wind erosion.|
|Appears in Collections:||第59卷 第03期|
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