摘要
结合天然降雨特性,研制了一套适于岩土工程降雨模型试验和水土保持的自循环式人工降雨模拟装置,并对其降雨特性进行了率定试验,得到了该装置降雨强度与控水阀门开度、降雨动能与降雨强度、雨滴平均直径与滤纸色斑平均直径等特征量之间的计算关系式及雨滴直径累积频率分布曲线.结果表明:该装置实现了雨水自循环利用,可模拟的降雨强度范围为4.65 mm/h-406.05 mm/h,降雨均匀度超过85%,雨滴粒径和雨滴终点落地速度分别在0.94-2.16 mm、3.69-7.14 m/s之间,模拟降雨与天然降雨的相似度好,为实验室为在短期内开展大批量降雨模型试验和获取实验数据提供了保障.
In view of the shortage of the existing rainfall simulation device and the characteristics of the natural rainfall, a self-circulation artificial rainfall simulator for soil and water conservation and geotechnical engineering rainfall model test was developed and its rainfall characteristics were tested. The relationship between the rainfall intensity and the opening degree of water control valve, the rainfall kinetic energy and the rainfall intensity, the average diameter of raindrop and the mean diameter of filter paper were calculated and the accumulated frequency distribution curve of rainfall droplet diameter was obtained through the experimental study of rainfall characteristics. The results show that the similarity between the simulated rainfall and the natural rainfall is quite high, and it can simulate the rainfall intensity of 4.65 mm/h -406.05 mm/h. The rainfall uniformity is more than 85 %, the size of raindrops is between 0.94 mm and 2.16 mm, and the falling speed of the rain drops is between 3.69 rrgs and 7.14 m/s. The device has realized the self-recycling of rainwater and provided technical guarantee for the laboratory to carry out large-scale rainfall model tests and obtain experimental data in a short time.
出处
《湖南城市学院学报（自然科学版）》
CAS
2017年第2期1-5,共5页
Journal of Hunan City University:Natural Science
基金
国家自然科学基金项目(51308198)
湖南省教育厅科研项目(14B034)
关键词
雨水自循环
降雨模拟装置
降雨特性
研制
率定
rainwater self-recycling
rainfall simulation device
rainfall characteristics
development
rate
