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为实现径流小区泥沙监测中集流桶(池)中含沙量的测量的准确计算,采用室内模拟试验,研究搅拌取样测量紫色土含沙量的误差及影响因素。含沙量水平均匀设计为:1、2、5、8、10、20、50、80、100、200、500、800和1 000kg/m~3共13个水平。泥沙水样总体积分别为50和100L,按照设计的含沙量水平制备泥沙水样,进行搅拌取样试验,将测量含沙量与设计含沙量进行对比,分析测量误差。试验结果表明,紫色土用搅拌取样法测得含沙量均小于实际值。当设计含沙量为1~200kg/m~3时,测量含沙量的相对误差在-30%~-50%;当设计含沙量为500、800和1 000kg/m~3时,测量含沙量的相对误差下降到-20%以下,但此时绝对误差最高达-110kg/m~3。泥沙含量和水体体积对含沙量测量结果均有影响。可以通过类似试验方法,建立不同工况下传统取样方法测量的含沙量与实际含沙量的关系,用于校正传统测量方法得到的含沙量。
In order to realize the accurate calculation of the sediment concentration in the sedimentation tank (pond) in runoff sediment monitoring, indoor simulation test is used to study the error and influencing factors of purple soil sediment concentration by stirring sampling. The average sediment concentration is designed to be 1, 2, 5, 8, 10, 20, 50, 80, 100, 200, 500, 800 and 1 000 kg / m3. The total volume of sediment water samples were 50 and 100L, respectively, in accordance with the designed sediment concentration prepared sediment water samples, stirring sampling test, the measured sediment concentration and sediment content were compared to analyze the measurement error. The test results show that purple soil with stirring sampling method measured sediment concentrations were less than the actual value. When the designed sediment concentration is 1 ~ 200kg / m ~ 3, the relative error of the measured sediment concentration is -30% ~ -50%; when the design sediment concentration is 500,800 and 1000kg / m ~ 3, The relative error of sediment dropped to below -20%, but this time the absolute error up to -110kg / m ~ 3. Sediment content and volume of water have an impact on sediment concentration measurements. Similar test methods can be used to establish the relationship between the sediment concentration and the actual sediment concentration measured by the traditional sampling method under different working conditions and used to correct the sediment concentration obtained by the traditional measurement methods.