Grain size characteristics and seasonal variation of the Ninghai-Xishuanghe lobe tidal flat sediments in southern Yellow River Delta
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摘要: 根据15个表层沉积物丰、枯季粒度数据，综合运用Pejrup粒度三角图、粒径-标准偏差曲线以及粒度参数分析法，对现代黄河三角洲南部宁海—西双河叶瓣潮滩丰、枯季沉积物粒度特征进行了分析。结果表明：沉积物粒度存在季节性变化，且空间分布不同。丰季由于降水量大，总体沉积环境相对稳定；枯季沉积环境相对动荡，受现代黄河影响明显。粒度参数相互关系显示，沉积物在形成前经历了较长时间的分选，物质来源多样性与潮滩动力关系不大，且丰季与枯季物质来源不同。对比丰季和枯季沉积环境函数值，发现丰季受潮汐余流影响较强，以浅海沉积为主；枯季在黄河及沿岸河流影响下，以河流（三角洲）沉积为主。Abstract: According to the grain size data of 15 groups of surface sediment samples in wet and dry seasons, the methods of Pejrup grain size triangle, grain size-standard deviation curve and grain size parameter analysis are used to analyze the sedimentary characteristics of Ninghai-Xishuanhe lobe tidal flat in the south of modern Yellow River Delta in wet and dry seasons. The results indicate that the grain size of sediments change with season and the spatial distribution is different as well. Due to the large precipitation in wet season, the general sedimentary environment is stable, while the sedimentary environment in dry season is relatively turbulent, more obviously affected by the modern Yellow River. The correlation of grain size parameters shows that the sediments undergo long-time sorting before formation. The diversity of material sources has little to do with tidal flat dynamics, and the material sources are different in wet and dry seasons. By comparing the function values of sedimentary environment in wet and dry seasons, it is found that the wet season is strongly affected by tidal residual current, with neritic sediments dominated, while the dry season is dominated by fluvial (delta) deposits under the influence of Yellow River and nearby rivers.
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Key words:
- Ninghai-Xishuanghe lobe /
- tidal flat /
- grain size /
- wet and dry seasons /
- Yellow River Delta
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