悬沙中 D>0.06mm 粗粒的粒析级配组成及其改正方法

Size gradation curve of coarse suspended sediment ( D >0.06mm) measured in settling tube: composition and its correction

本文首先简述Ｄ＞０．０６ｍｍ泥沙的粒析沉降特性及其粒径偏粗的原因。继之对悬沙中粒径大于０．０６ｍｍ的粒析级配组成机理，及级配组成不同对标准粒径Ｄｂ与粒析粒径ＤＬ关系的影响进行了详细研究。在以上研究工作的基础上，开展了Ｄｂ与ＤＬ的比较试验，得出了粗、中、细型悬沙的Ｄｂ～ＤＬ关系和对ＤＬ的改正方法。

In this paper, the settling characteristics of sediment particles ( D >0.06 mm) falling in a settling tube and the reason why the measured sizes are coarser than real ones are described briefly. After that, The effect of grain size composition on the relationship between the diameter D L measured by settling tube method and that by standard sedimentation diameter D b for diffetent size gradations is studied in detail. Based on these studies, experiments were carried out to compare D L and D b . And the relationships of D L and D b for coarse, medium and fine suspended sediment particles, which may be used for the correction of the measured size D L are obtained.