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径流小区泥沙量的测定是定量研究坡地和小流域水土流失的基础,在土壤侵蚀模型建立和水土流失预测方面有重要的意义.搅拌取样法是目前应用最广的径流含沙量测定方法,但由于所取样本为表层混合样,粗颗粒泥沙含量少,样本代表性较差,测得的泥沙量远小于实际泥沙量.为此,提出了一种改进的取样方法——沉淀取样法.该法的样本为风干若干小时后的泥沙样品,泥沙分布较为均匀,具有一定的代表性,测定的泥沙含量数据精度较高.根据2012—2013年的实测值,将以上两种方法测定的泥沙量数据进行相互对比,并用年终实测数据进行验证,最终得到较为准确的数据.
The determination of sediment yield in runoff plots is the basis for quantitative study of soil erosion in slope and small watershed, which is of great significance in the establishment of soil erosion models and prediction of soil and water loss.Ramp sampling method is the most widely used method for determination of runoff sediment concentration, However, due to the sample being mixed surface sample, the coarse sediment content is small, the representative of the sample is poor, the measured sediment is much smaller than the actual sediment.To this end, an improved sampling method - precipitation Sampling method.The sample of the law of the sand samples after drying for a few hours, the distribution of sediment is more uniform, has a certain representation, the determination of sediment content data accuracy is higher.According to the measured value of 2012-2013, the above The sediment amount data measured by the two methods are compared with each other and verified with the year-end measured data, finally obtaining more accurate data.