论文部分内容阅读
泥沙的粒径级配曲线是解决泥沙问题所需的基本资料.但现有取得这项资料的几种颗分方法,不仅在适用条件方面要求不同,而且各种方法对同一沙样颗分结果也很不一致.为了定量掌握各种颗分法实测结果的差异,分析各自存在的问题以便改进,我们曾对取自长江、黄河、灌河、连云港、射阳河口的中值粒径为260～0.3微米(μm)的三百多个沙样分别用筛分法、粒径计法、移液管法以及最新的消光法进行了七百多次颗分
The sediment particle size gradation curve is the basic information needed to solve the sediment problem, but the existing methods for obtaining this data not only require different conditions, but also apply different methods to the same sand sample In order to quantitatively grasp the differences between the actual results of different gravimetric methods and analyze the existing problems for improvement, we have analyzed the median grain size of the Yangtze River, Yellow River, Guan River, Lianyungang and Sheyang estuary Three hundred and seventy sand samples of 260 to 0.3 micrometers (μm) were respectively sieved, particle size meter, pipette method and the latest extinction method for more than 700 times