SPATIAL AND TEMPORAL VARIATION IN SEDIMENT DISTRIBUTION IN THE ABANDONED YELLOW RIVER DELTA OF NORTH JIANGSU
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摘要: 基于苏北废黄河三角洲近岸冬夏两季的表层沉积物粒度参数分析结果,研究了沉积物的时空变化特征。结果表明,沉积物分布具有显著的时空变化特征:空间上由岸向海、由北侧至南侧,沉积物粒度呈变粗的趋势;时间上,沉积物粒径冬季粗于夏季。沉积物分选普遍较差,偏态为正偏,峰态尖锐。受季节性风的影响,冬季沉积动力环境比夏季复杂,沉积物粒度参数变化幅度较夏季大,冬季样品粒度参数等值线梯度明显大于夏季。在粒级-标准偏差曲线上,高峰值在52.55~88.39 μm,为敏感粒级。研究区在潮流和季风驱动的风浪作用下,沉积环境具有波-流联合作用复杂的特点。Abstract: Grain size analysis for winter and summer sediments collected from the abandoned Yellow River delta of northern Jiangsu was made for study of the spatial and temporal distribution of grain-size parameters in different seasons. Results show that sediment particle size becomes coarsen form coast to offshore and form north to south in the study area spatially, and is coarser in winter than in summer temporally. Generally, the sediment is poorly sorted, with a positive skewness and sharp kurtosis. Since the effect of wind is different in seasons, the grain-size parameters are more complex in winter times, and all the parameters vary in a broad range. Laterally, the gradients of grain-size parameters for the samples collected in winter times are obviously larger than those from summer samples. The sediment with a peak value around 52.55~88.39 μm was identified as a sensitive size to climatic change. Due to the joint action of wave and tide under the driving of monsoon, the study area is characterized by complex dynamics.
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