江苏潮滩沉积物激光粒度仪与移液管-筛析分析结果的对比

激光粒度仪的广泛应用带来了与历史数据的对比问题，因此需要建立激光粒度仪与早期分析结果之间的关系。根据江苏海岸潮滩沉积物样品的激光粒度仪和移液管-筛析法分析，对粒度参数、粒度组分等进行了对比，对两种方法的差异进行了分析。结果表明，对于江苏潮滩沉积物粒度参数中平均粒径的激光粒度仪与移液管-筛析分析结果之间有良好的线性关系；筛分法测得的粗颗粒物质较激光法偏少，而移液管法法测得的细颗粒物质较激光法偏多；将样品分类之后再进行两种方法所获粒度参数的回归分析，相关性得以提高，说明不同粒度组成的沉积物对分析结果的对比有不同的影响。两种方法之间的换算关系不仅与研究区域有关，而且与沉积物本身的粒度组成有关。

Comparison Between Grain Size Data by Laser and Pipette-sieve Methods for Tidal Flat Sediments on Jiangsu Coast

The wide application of the laser particle size analyzer results in a problem in the comparison between the new and old, historical data sets; it is necessary to establish the relationships between the two. In this study, based on the grain size analysis using the laser technique and pipette sieve method for tidal flat sediment samples from the Jiangsu coast, eastern China, the two sets of grain size parameters are compared and the differences between the two methods are analyzed. The results show that: for the Jiangsu coast sediment samples there is a significant linear relationship between the mean grain sizes; compared with the laser analysis, the percentages of coarse grained materials are relatively small in the sieving analysis, whereas the percentages of fine grained materials are relatively large in the settling analysis; and the linear correlation is enhanced after the sediment samples are classified according to their grain size compositions and regression analysis are carried out for different groups, indicating the influence of the composition factor. The relationship between the two types of analysis not only depends upon the region in consideration, it is but also related to the grain size composition patterns. 