一种测定侵蚀沉淀的简捷方法及其可靠性

A Simple-Rapid Method for Sediment Measurement and Its Effectiveness

为使侵蚀沉淀测定简单易行，而且可靠，在原有“密度置换法”的基础上，根据水的密度受温度变化的影响较小，建立径流蚀沙（沉淀）含量与径流密度的经验模型，结果表明：二者间的最佳模型是直线型，达极显著水平以上。模型参数与土壤类型（蚀沙组成）有关；同一土壤类型，模型参数随蚀沙组成的变化而变化不明显。同时与经典方法（“沉淀称重法”）比较，应用经验模型法，明显提高了测定结果的精确度。

In order to find a simple rapid and correct method for measurement of sediment, based upon the “density transforming” method and the very little variation of water density caused by the varying of water temperature, the empirical models of relationship between sediment content of runoff and its density were determined for the sediment measuring. The results shown the significant level of all regression equations is better, and the optimal model is linear one. Parameters of model vary clearly with the soil type, but slightly with the particle distribution of sediment for a same soil type. Comparing with the thumb method precipitation weighting method, more accurate was shown using empirical models for determination.