Development of New Type Snowbreak Fence with Induced Plate in the Form of Circular Arc Airfoil for Prevention of Blowing-Snow Disasters

本研究的目的是开发一种新型的圆弧翼型诱导雪板防雪护栏，以防止冬季道路上的雪堆和提高能见度。本研究开发的雪栅具有底部吹雪破碎和顶部以圆弧翼型形式受诱导雪板吹雪两种性能。也就是说，所研制的雪栅栏具有常规吹雪型和防雪型两种功能。通过风洞吹雪模拟、数值模拟分析和原型模型的现场试验，对研制的雪栅的性能进行了评价。主要研究结果如下：(1)研制的雪飞型雪栅栏为双车道车道高度为3.5 m、四车道车道高度为5.0 m的雪栅栏。充分发展的飞雪式防雪栅栏，更具有防止二车道和四车道道路吹雪灾害的性能。(2)制作了两种雪栅栏的原型模型，分别安装了两车道和四车道道路，对两种雪栅栏的性能进行了评价。由此可以证明，与传统防雪围栏相比，所研制的防雪围栏在防雪和提高能见度方面具有较高的性能。此外，开发的雪栅栏可以得到道路养护管理者的很高评价。(3)研制的两种类型的雪栅栏的生产成本可制成与常规雪栅栏相同档次的雪栅栏。因此，在平成14年，即该研究、利用和商业化生产的最后一个财政年度，开发的雪栅栏可以实现，并在总延长2公里的范围内采用。此外，在平成15财政年度，计划安装许多已开发的雪栅栏，预计雪栅栏的传播将迅速发展。少

The purpose of the present research was to develop a new type snowbreak fence with induced snow plate in the form of circular arc airfoil for the prevention of snowdrifts and improving visibility on roadways during winter. The developed snow fence in present research has two performances of which blowing snow is broken at the bottom part and is blown by the induced snow plate in the form of circular arc airfoil at the top part. Namely, the developed snow fence has both functions of a conventional snow blowing-off type and a snowbreak type. The performance of developed snow fence was evaluated by blowing-snow simulation in wind tunnel, numerical simulation analysis and the field test using the prototype model. The main results of the present research may be summarized at follows:(1) The developed snow fences named snowflight type are the snow fence with height of 3.5 m for two lane reads and 5.0 m for four lane roads. The snowflight type snow fence by which any were developed fully had … More the performance to prevent the blowing-snow disasters of two lanes and four lanes roads.(2) The prototype models of two snow fences were manufactured, installing two lane roads and four lane roads in order to evaluate the performance of the developed snow fence of two types. Consequently, it could be proved that the developed snow fence has high performance in preventing snowdrifts and improving visibility in comparison with the conventional snowbreak fence. Furthermore, the developed snow fences could obtained very high evaluation from the road maintenance administrators.(3) The production cost of the developed snow fence of two types could be made of the same grade as the conventional snow fence. Consequently, in the Heisei 14 years which is last fiscal year of this research, utilization and commercial production the developed snow fences could be attained, and it was adopted over the total extended two kilometer. Also, in the Heisei 15 fiscal year, many installations of the developed snow fences are planned and it will be expected that the spread of the snow fences develop quickly. Less