风成沉积物3种粒度参数计算方法比较  

A comparative study on the three calculation methods of grain-size parameters for aeolian sediments

作　　者：马茜茜 肖建华 姚正毅 Ma Xixi;Xiao Jianhua;Yao Zhengyi(Key Laboratory of Desert and Desertification,Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China;College of Natural Resources and Environment,University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院西北生态环境资源研究院沙漠与沙漠化重点实验室,甘肃兰州730000 [2]中国科学院大学资源与环境学院,北京100049

出　　处：《中国沙漠》2020年第4期95-102,共8页Journal of Desert Research

基　　金：内蒙古自治区交通运输厅建设科技项目(NJ-2018-29);中国科学院西北生态环境资源研究院青年基金项目。

摘　　要：沙物质粒度特征是反映物源、沉积环境等的关键指标。粒度解析方法的多样性制约了多源数据的系统整合和分析。采集3组风成沉积物样本(总计222个),分别用Folk-Word图解法、Friedman矩法、McManus矩法计算平均粒径(Mz)、分选系数(σ)、偏度(SK)、峰度(Kg)。结果表明:3组样品中使用图解法和矩法计算的Mz、σ均呈显著正相关,与沉积环境无关;SK和K_g基本不具相关性,与沉积环境和粒度频率曲线的形态关系密切。从统计学上看,K_g应当与σ的数值意义相反,即二者负相关,故Friedman矩法适用性强。在粒度分析过程中,应充分考虑不同计算方法的差异,建立不同的定性分级标准。The grain-size characteristics of sediments are the key indicators that reflect the sediment sources and the sedimentary environment. The diversity of granular analysis methods restricts the systematic integration and analysis of multi-source data. Based on three groups of aeolian sediment samples(a total of 222),the grain-size parameters including Average Grain-Size(Mz),Sorting-Coefficient(σ),Skewness(SK),and Kurtosis(Kg)are calculated by Folk-Word Graphical-Method,McManus Moment and Friedman Moment Methods. The results show that the linear correlativity of Mzand σ,respectively obtained by the Graphical-Method and the MomentMethod,is prominent in the three groups of samples,which is not related to the sedimentary environment. SK and K_gobtained by the three calculation methods are basically not correlated and non-interchangeable,which is closely related to the differences of sedimentary environment and the morphology of frequency curve of grainsize. Statistically,the numerical significance of K_gshould be contrary to that of σ,i. e. negative correlation.Therefore,the Friedman Moment-Method is more applicable. In the process of granularity analysis,we should fully consider the differences in different calculation methods and establish corresponding qualitative grading standards.

关 键 词：风成沉积物 粒度参数 矩法 相关性 沉积环境 

分 类 号：P931.3[天文地球—自然地理学]