单喷头变雨强模拟侵蚀降雨装置研究初报

Modeling Erode Rainfall Device by Using Moni-spray Gun to Change Rain Intensity

通过多次筛选试验研制出的单喷头变雨强模拟侵蚀降雨装置，以250余次的性能检测试验的结果表明：①该装置的有效模拟降雨面积为20～40m^2；②降雨强度I与供水压力P的关系为I=13．017P^(1.456)，r=0．978；③降雨均匀系数K≥0.80；④雨滴动能E，尺度参数a和中数直径d_50％与供水压力之间的关系分别为E=6．374P^(0.459)、r=0.928；a=0．919P^(0.259)，r=0．909；d50％=0．856P^(0.258)，r=0．880。除了具备传统侧喷式模拟侵蚀降雨机的功能外，该装置还具有体积小、重量轻、能耗低、移动方便、易操作、计算简便，性能可靠等特点，特别用于基层水土保持单位进行水土流失监测和水土保持效益研究。

The modeling erode rainfall device by using moni-spray gun to change rain intensity has been made through many times select experiments. More 250 times experiment resultsshowed that the device has an area of 20~ 40m2 supplyed for efficient rainfall formed. The reIation between rainfall intensity I and supplying water pressure P is as follows: I = 13. 017P1.456,r = 0. 978. The rainfall equality coefficient K ≥0. 80. The rainfall motive energy E , the size a and the med direction d50% is respectively related to P as follows: E = 6. 374P0.459,r = 0. 928,a = 0. 919P0.259,r = 0. 909,d50t = 0. 856P0.258,r = 0. 880