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首页> 外文期刊>Marine Geology >The use of grain size trend analysis in macrotidal areas with breakwaters: Implications of settling velocity and spatial sampling density
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The use of grain size trend analysis in macrotidal areas with breakwaters: Implications of settling velocity and spatial sampling density

机译：粒度趋势分析在防波堤大潮地区的应用：沉降速度和空间采样密度的含义

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摘要

In a macrotidal environment with offshore breakwaters (Elmer, West Sussex) a new approach for the identification of the sediment transport pathways with grain size trend analysis (GSTA) was undertaken using statistical parameters (mean, sorting and skewness) directly derived from settling velocities distributions. The same samples were analysed with sieving (quarter- and half-phi resolution) and GSTA was performed again in order to directly compare the resultant sediment transport directions derived with the two analytical techniques. Furthermore, both regular and irregular sampling distributions were used to recalculate GSTA. Hydrodynamic data were collected in different locations around the breakwaters and net sediment transport directions were calculated in order to assess the accuracy of the sediment transport pathway directions derived with the different analytical techniques. The accuracy of settling velocity in determining the statistical parameters of the grain size distribution is identified, especially for the fine-medium sand sediments. Settling velocities produced better results than the sieving; the quarter-phi resolution producing the poorer results in comparison with the coarser half-phi resolution. The results for the different spatial sampling strategies are found to depend upon the number of samples utilised; that shows that the accuracy of the GSTA is based upon the ability of representing, adequately, the spatial distribution of the sediment parameters.
机译：在具有近海防波堤的大潮环境中（西萨塞克斯州埃尔默市），采用了直接从沉降速度分布中得出的统计参数（均值，分类和偏度）进行了利用粒度趋势分析（GSTA）识别沉积物输送路径的新方法。 。用筛分法（四分之一和半phi分辨率）分析相同的样品，并再次进行GSTA，以直接比较两种分析技术得出的沉积物输运方向。此外，规则和不规则采样分布都用于重新计算GSTA。在防波堤周围的不同位置收集了水动力数据，并计算了净沉积物传输方向，以评估采用不同分析技术得出的沉积物传输路径方向的准确性。确定沉降速度在确定粒度分布的统计参数方面的准确性，特别是对于中细砂沉积物。沉降速度比筛分产生更好的结果。与较粗糙的半phi分辨率相比，四分之一phi分辨率产生的效果较差。发现不同空间采样策略的结果取决于所使用的样本数量。这表明，GSTA的准确性基于充分表示沉积物参数的空间分布的能力。

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