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首页> 外文期刊>Sedimentology: Journal of the International Association of Sedimentologists >Composite methodology for interpreting sediment transport pathways from spatial trends in grain size: A case study of the Lithuanian coast
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Composite methodology for interpreting sediment transport pathways from spatial trends in grain size: A case study of the Lithuanian coast

机译：从粒度的空间趋势解释沉积物输运途径的综合方法：以立陶宛海岸为例

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摘要

To achieve a more robust interpretation of sediment conditions and transport based on grain size, this study combines the perspectives of two different interpretation techniques that have been developed separately and applied in the literature: (i) 'grain size trend analysis' interprets changes between interrelated sampling sites assuming that sediment in the direction of transport should become either coarser, better sorted and more positively skewed, or finer, better sorted and more negatively skewed; and (ii) the 'population anomalies' method, which estimates the balance between erosion and accumulation processes at each sampling site based on individual site deviations compared with average values for grain-size parameters in the area of interest. The simultaneous use of both approaches enables sedimentological conditions and transport alternatives to be distinguished. This improvement is necessary because site-specific changes and general textural trends provide information that complements the strengths and weaknesses of each perspective. The methods are implemented here using two-dimensional Geographic Information System tools and illustrated for the Lithuanian coast. Grain-size characteristics of 712 surface samples of sandy sediments are used to interpret sediment transport pathways and predominant sedimentological conditions in the Lithuanian coastal zone. In general, coast-parallel sediment transport dominates the entire investigation area, although wave-induced movement perpendicular to the coastline is inferred in the shallow near-shore zone. The deepest areas offshore are characterized by sea floor erosion in the north, whereas an accumulation zone occurs in the relatively deep central part of the study area.
机译：为了获得基于粒度的对沉积物条件和输运的更可靠的解释，本研究结合了分别开发并应用于文献中的两种不同解释技术的观点：（i）“粒度趋势分析”解释了相互关联的变化假定在运输方向上的沉积物应变得更粗，分类更好，更偏斜或更细，更好分类，更偏斜的采样点; （ii）“种群异常”方法，该方法根据各个采样点的偏差与目标区域中粒度参数的平均值进行比较，估算每个采样点的侵蚀和累积过程之间的平衡。同时使用两种方法可以区分沉积条件和运输方式。这种改进是必要的，因为特定于站点的更改和总体纹理趋势提供了可补充每种观点的优点和缺点的信息。该方法在此使用二维地理信息系统工具实现，并在立陶宛海岸进行了说明。 712个沙质沉积物表面样本的粒度特征被用来解释立陶宛沿海地区的沉积物传输途径和主要的沉积学条件。一般说来，尽管在浅海近岸区域推断出垂直于海岸线的波浪引起的运动，但平行于海岸的沉积物运移仍占据整个调查区域。海上最深的区域以北部海床侵蚀为特征，而一个聚集区出现在研究区域的相对较深的中部。

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