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 -503C 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 =0.3839D0.709 when the raindrops were at their terminal velocity.2) The effective rainfall uniformity of the QYJY-503C artificial rainfall simulation system was over 80％.3) The raindrop diameter increased with the increasing rainfall intensity following a power function of d50 =0.5595I0.2805;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 =0.0042I-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-503C artificial rainfall simulation system was stable and reliable,so it can be used to study soil erosion indoor.
artificial rainfall simulationcalibrationraindrop diameterkinetic energy of rainfallsoil erosion
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