青岛市灵山湾海水浴场表层沉积物粒度冬季变化特征及其原因

于2013年11月、2014年1月及3月在青岛市灵山湾海水浴场进行了3次表层沉积物采样,对粒度组分和粒度参数平面分布的变化进行了分析。结果表明,本区沉积物整体有变粗的趋势,细砂组分特别是极细砂和粉砂组分含量下降明显,分选性变好,正偏态及高峰度分布区扩大,粒度参数高值分布区被消除。粒径趋势分析表明,在涨潮流与强盛的冬季风驱动的风浪、沿岸流的综合作用下,研究区沉积物总体呈北东-南西向沿岸输运,运移趋势变化受到波浪、潮流水动力条件与地形相互作用的影响。短期的波能变化足以改变沙滩地貌,从而影响表层沉积物的分布。可为浴场维护提供理论依据。

Variation in characteristics of surface sediment particle size and influencing factors in winter at the Lingshanwan Beach, Qingdao

In this study, we sampled surface sediments three times at the Lingshanwan Beach, Qingdao in November 2013, and January and March 2014. We then examined the particle size compositions and grain size distributions of the surface sediment. Results show that the grain size of the surface sediment became coarser and the sorting became better over the study period. The fine sand components decreased significantly, especially the very fine sand and silt. The region of positive skewness and high kurtosis expanded and the high-value area of the grain size parameters changed significantly, and was ultimately eliminated. Our grain-size trend analysis results indicate that the sediments were transported from the NE to the SW along the coast, which is affected by wind-driven waves in winter, coastal currents, and flood currents. Short-term fluctuations of wave energy can reshape the beach topography and affect the distribution of surface sediments. These results provide a theoretical basis for beach management.