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科技导报  2014 

黄岛金沙滩现代波痕沉积特征与水动力关系

DOI: 10.3981/j.issn.1000-7857.2014.002, PP. 22-29

Keywords: 黄岛金沙滩,波痕沉积特征,水动力

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Abstract:

黄岛金沙滩为典型的无障壁高能海岸,后滨发育有风成波痕,前滨滩槽和近滨上部可见大量浪成波痕。本文通过对上述3种环境下波痕的形态、沉积物粒度特征及前滨波痕形成水动力条件进行分析研究发现1)后滨风成波痕波长、波高、迎流面及背流面相对浪成波痕较小,但波痕指数较大,而前滨滩槽、近滨上部波痕由陆向海波长、迎流面、背流面变小。2)风成波痕沉积物粒度波峰较粗,而浪成波痕沉积物粒度波谷较粗,从前滨到后滨沉积物粗组分减少,细组分增多;风成波痕、前滨滩槽波痕粒度频率分布曲线呈“双峰”特征,而近滨上部波痕粒度频率分布曲线主体呈“单峰”特征,风成波痕、滩槽波痕沉积物缺少悬浮组分;波痕沉积物分选-峰度图、分选-偏度图可以较好地判别沉积环境。3)平均粒径与流速、水深、弗劳德数Fr有很好的线性关系,前滨退潮时形成波痕的水动力条件具有水体浅、流速小和水动力弱的特点,可能与退潮时水速、水深变化较快有关。4)对前滨波痕沉积特征与相应流速、水深分别进行逐步回归分析,获得了形成环境的流速、水深的回归关系式。

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