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Sediment facies and hydrodynamic setting: a study in the south western Baltic Sea

机译：沉积相和水动力环境：波罗的海西南部的一项研究

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This study aims at investigating the relationship between sedimentary facies and hydrodynamic setting by applying statistical analysis of sedimentological data and hydrodynamic modelling. The facies description bases on a dataset of grain-size analysis of surface sediments of the southwestern Baltic Sea. The facies is described by the grain-size parameters median, sorting, and skewness – parameters of a distribution function fitting the grain-size data. The function was derived from a formula proposed by Tauber (1995). The three grain-size parameters were mapped for the southwestern Baltic Sea area applying ordinary kriging (Journel and Huijbregts 1978). The study area was subdivided into uniform facies regions using the concept of regionalized classification after Harff and Davis (1990). The near-bottom hydrodynamic conditions controlling sediment deposition are represented by the average kinetic current energy, the average kinetic wave energy, and the average current vector derived from results of numerical modelling covering a period of 1 year (Rietz et al. 2000). Transport pathways in the southwestern Baltic Sea were postulated based on the directions of the average current vectors which are assumed to be the preferred directions for clastic material transport. A comparison of the hydrodynamic conditions at selected test locations along the preferred transport pathways with the granulometric facies reveals the common case of a direct genetic dependency between the surface sediment facies and the recent hydrodynamic setting. An exception occurs within the Pomeranian Bight. Results indicate that the sediments of this area have not been accumulated under the present-day conditions which supports the findings of Wehner (1990) reporting a glacio-fluviatile late Pleistocene genesis of the sediments there.
机译：本研究旨在通过应用沉积学数据的统计分析和水动力模型研究沉积相与水动力环境之间的关系。相描述基于西南波罗的海表层沉积物的粒度分析数据集。相由粒度参数中值，排序和偏斜度（适合粒度数据的分布函数的参数）描述。该函数源自Tauber（1995）提出的公式。使用普通克里金法，绘制了波罗的海西南地区的三个粒度参数（Journel and Huijbregts 1978）。根据Harff和Davis（1990）的研究，将研究区域划分为统一的相区。控制沉积物沉积的近底部水动力条件由平均动能，平均动波能和平均电流矢量表示，这些矢量来自于为期1年的数值模拟结果（Rietz等，2000）。根据平均电流矢量的方向假定了波罗的海西南部的运输路径，这些电流被认为是碎屑物质运输的首选方向。沿首选传输路径在选定测试位置的水动力条件与粒度相的比较揭示了表层沉积物相与近期水动力环境之间直接遗传相关的常见情况。 Pomeranian海岸线内发生例外。结果表明，该地区的沉积物在当前条件下尚未积累，这支持了Wehner（1990）的发现，该发现是该沉积物的冰川脆弱的晚更新世成因。

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