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水土流失观测人工泥沙样品误差较大,因此样品均匀是提高观测准确性的关键。该文在已研制的可移动径流观测装置的基础上,通过对其泥沙混合装置中关键参数的实验测定,确定泥沙混合效果最佳条件下的混样桶高度和直径,以此实现高混合度泥沙样品的获取。结果表明:一级分流装置在高度H150mm×直径Φ200mm时混合效果最好,样品误差小于16%;二级分流装置在高度H40mm×直径Φ60mm时效果最好,样品误差小于7%。通过设定分流装置的高度和直径,可显著提高径流泥沙混合效果,此研究为提高可移动径流观测装置的观测精度提供了参考。
Soil erosion observation artificial sand sample error is large, so the sample uniformity is to improve the accuracy of the observation key. Based on the developed movable runoff observation device, the experiment of determining the key parameters in the sediment mixing device is carried out to determine the height and diameter of the mixed sampler under the optimal conditions of sediment mixing, so as to achieve high Mixed Sediment Sample Acquisition. The results show that the first-order shunt device has the best mixing effect at the height of H150mm × diameter of Φ200mm, the error of sample is less than 16%; the secondary shunt device has the best effect at the height of H40mm × diameter of Φ60mm with the error of less than 7%. By setting the height and diameter of the diverting device, the mixed effect of runoff and sediment can be significantly improved. This study provides a reference for improving the observing accuracy of the movable radial flow observing device.