南黄海表层沉积物粒度特征季节变化及其影响因素

摘要

We have analyzed graln sizes of 27 surface sediment samples collected from the same stations in the South Yel-low Sea in spring and autumn. Combined with hydrological data, the seasonal variations of graln size characteristics of sur-face sediments have been studied, and the influencing factors of the variations have also been discussed according to related literatures. The results indicate that the surface sediments in the South Yellow Sea can be divided into four kinds of types, including silty sand, sandy silt, silt and mud with Folk’s classification. Compared with the results in spring, the sand and silt contents increase while the clay content decreases in autumn. Correspondingly, the mean graln size (Mz) is coarser in au-tumn. The changes of sorting coefficient (σ) and kurtosis (Kµ) are smaller, while the skewness (Sk) is more positively skewed in autumn. Moreover, the seasonal variations show obvious regional differences, which are influenced by the circu-lation system, river discharges and seasonal changes of waves.%通过对南黄海春季和秋季27个相同站位表层沉积物的粒度分析，并结合水文观测资料，研究了南黄海表层沉积物粒度的季节变化，参考文献资料初步讨论了粒度变化的影响因素。研究结果显示，按照Folk分类，南黄海表层沉积物可以分为粉砂质砂、砂质粉砂、粉砂和泥四种类型。秋季与春季相比，总体上砂和粉砂的含量增加，黏土含量降低，相应地平均粒径相对变粗，分选系数和峰态的变化较小，而偏态表现为更加正偏。季节性变化还表现出明显的区域差异，主要是受环流系统、河流来沙及波浪的季节性变化的影响。