泥沙筛析与沉降粒径关系及其应用的研究

为准确测定泥沙的沉降粒径并确定筛析粒径与Ｄ沉的关系，试验中采用天然沙的筛析分组沙作为试样，逐颗测定沉积，得出Ｄ沉以及Ｄ筛与Ｄ沉的关系。经分析论证并与国际上的试验塑料比较后认为，试验所得Ｄ筛与Ｄ沉关系合理可靠。

Testing research on relationship between sieving size and falling diameter of sediment and its application

In order to determine accurately the fallig diameter ( D falling ) and the relation between sieving size ( D sieved ) and falling diameter D falling of sediment, the sieving size fraction of fluvial sediment is used in the test as the sample to measure falling velocity of its particle one by one. On the basis of examination and demonstration, and after the comparison with the test results abroad, it is confirmed that the tested relation between D sieved and D falling is reasonable and reliable. It can be used to solve how to turn the size distributions analysed by the two different kinds of methods into a unified systematical result when a sample has to be analysed by sieving and falling methods respectively. At the same time, a simple available method is provided for studying the relation between D falling and D s.t (diameter measured by settling tube method) of five sediment ( D =0.06-0.15mm) and converting D s.t into D falling .