Abstract The results of grain size distribution of loess units are suitable for the study of past climate change. There are many methods for the analysis of the grain size, but clustering methods have not been used before. In this article, a new approach in the sediment research, the k-median method was used. This method separates the grain size classes of the youngest loess units of three loess-soil profiles in Poland: Biały Kościół, Złota and Tyszowce. In the analysis, only the content for the loess silt fraction (range from 4 to 63 µm) was used. This allowed eliminating the admixtures of sandy and clay fraction, considered as secondary material. For the purposes of this analysis, silt fractions were divided into smaller units using a 1/4 phi interval, resulting in 16 new subfractions. The grain size data from three profiles were combined into one data set. As a result, four classes with a similar internal of grain structure were obtained. The separated classes showed the sedimentological variability of the sediment well. It has been shown that the k-median method can be used to classify loess in a fast and objective way.

中文翻译：

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波兰晚Pleni-Weichselian黄土沉积(L1LL1)聚类新方法

摘要 黄土单元粒度分布结果适用于过去气候变化研究。分析晶粒尺寸的方法很多，但以前没有使用过聚类方法。在本文中，沉积物研究中使用了一种新方法，即k-中值法。这种方法分离了波兰三个黄土土壤剖面中最年轻的黄土单元的粒度等级：Biały Kościół、Złota 和 Tyszowce。在分析中，仅使用了黄土淤泥部分（范围从 4 到 63 µm）的含量。这允许消除被视为次要材料的砂质和粘土部分的混合物。出于本次分析的目的，淤泥组分使用 1/4 phi 间隔划分为更小的单元，从而产生 16 个新的亚组分。来自三个剖面的晶粒尺寸数据合并为一个数据集。结果，获得了具有相似内部晶粒结构的四个类别。分离的类别显示了沉积物井的沉积学变异性。已经表明，k-中值方法可用于以快速和客观的方式对黄土进行分类。