QYJY-503C人工模拟降雨装置降雨特性试验

Characteristics of artificial rainfall produced by QYJY-503C simulation system

为了使基于人工模拟降雨装置的水土保持试验更可靠,采用人工降雨试验方法,通过研究QYJY-503C人工模拟降雨装置的降雨特性,探讨该装置在水土保持科学试验中的适用性。结果表明：1）雨滴达到终速时雨滴-色斑直径的关系为d=0.383 9D0.709;2）QYJY-503C人工模拟降雨装置有效降雨均匀度超过80%;3）在试验范围内,雨滴直径随降雨强度增大而增大,雨滴中数直径与降雨强度呈d50=0.559 5I0.280 5的幂函数关系,相同降雨强度条件下的雨滴直径较天然雨滴偏小20%~70%;4）降雨动能与降雨强度呈E=0.004 2I-0.021的线性关系,可通过控制降雨强度实现降雨动能与天然降雨的相似性;5）QYJY-503C人工模拟降雨装置性能稳定、可控性强,可适用于室内土壤侵蚀的研究。

In order to make the soil and water conservation experiments based on artificial rainfall simulation system more reliable,we studied the characteristics of artificial rainfall produced by the QYJY-503 C simulation system and examined the possibility of application of the device in practical experiments of soil and water conservation. The results showed that： 1） the relationship between raindrop and stain diameters followed the function d = 0. 383 9D0. 709 when the raindrops were at their terminal velocity. 2）The effective rainfall uniformity of the QYJY-503 C artificial rainfall simulation system was over 80%. 3）The raindrop diameter increased with the increasing rainfall intensity following a power function of d50=0. 559 5I0. 280 5; at the same rainfall intensity,the diameter of raindrops generated by the device was 20%-70% smaller than that of natural raindrops. 4） The kinetic energy and rainfall intensity had a good linear relationship： E = 0. 004 2I-0. 021,suggesting that it is feasible to achieve the kinetic energy of natural rainfall through controlling the simulated rainfall intensity. 5） The performance of QYJY-503 C artificial rainfall simulation system was stable and reliable,so it can be used to study soil erosion indoor.