摘要:
随着人类开发活动的加剧,靖海湾沉积动力环境受到显著影响。靖海湾57个站位的表层沉积物调查资料的分析结果表明,靖海湾表层沉积物以砂质粉砂和粉砂为主,含有少量泥,沉积物粒径偏小;随着水动力条件的增强,表层沉积物平均粒径增大,分选系数呈增大趋势,正偏更显著;以此为依据,利用Pejrup三角图式把靖海湾划分出4个沉积动力环境单元,结合粒度概率图,认为靖海湾沉积物搬运方式以悬浮为主,跃移次之,并有少量以推移方式搬运,随着水动力条件的增强,悬浮组分减少,跃移组分和推移组分增加。
Abstract:
The dynamics of the depositional environment in the Jinghai Bay is significantly affected by human activities. The survey at 57 stations reveals that the surface sediments in the Jinghai Bay consist mainly of sandy silt and silt, with a small amount of mud. Whereas the hydrodynamics becomes stronger, all the grain size parameters, such as mean grain size, sorting coefficient and skewness increase. Pejrup's triangular diagram was adopted to divide the Jinghai Bay into 4 dynamic environments in combination of the grain size probability cumulative curves. The sediment is dominated by suspended load, followed by saltation load and rolling load successively. The suspended load decreases with the intensification of hydrodynamics.
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