沉积物粒度参数内涵及计算方法的解析.pdf

35 6 Vol35 N o6 2010 6 ENVIRONMENTAL SCIENCE AND MANAGEMENT June 2010 : 1674- 6139( 2010) 06- 0054- 07 卢连战, 史正涛 (, 650092) : 沉积物粒度参数是描述粒度分布特征的基本统计量, 包括平均粒径分 系数 (标准偏差)偏度(偏 态)和峰度(尖度 )等全面而深刻地解析了各个粒度参数概念的内涵, 指出了认识误区; 粒度分析在实践中有 广泛的应用; 介绍了两种基本的计算方法 (图解法和矩算法), 近年来前人在计算方法的应用上作出了很多改 进, 使求解过程变得更省时省力, 还提高了可靠性和适用性; 众多对比研究表明计算结果的相关性逐渐降低; 粒 度参数的分级与定性描述可以说明粒度分布的基本特征 :粒度参数; 内涵; 计算方法; 图解法; 矩法 : X513 : A Analysis for Se mi ent G rain Size Param eters of Connotations an CalculationM etho Lu L ianzhan, Shi Zhengtao (L aboratory of Environment, College ofTourism an Ggeoscience, Yunnan NormalU niversity, Kunm ing 650092, China) Abstract: Se mi ent grain size parameters are the basic statistics that escribe the character of particle size istribution, inclu ing mean particle size, sorting coefficient( stan ar ev iation), skewness an kurtosis. This paper analyzes the connotations of the concept of various grain size parameters comprehensively an profoun ly, an points out them isun erstan ing; Grain size analysis of the se mi ents has aw i e range of applications in practice, an intro uces two basicm etho s for calculating grain size istribu tion parameters, namely, graphicmetho an momentmetho ; In recent years, our pre ecessors have ma e many mi provem ents at the application of calculation metho , all of these can save tmi e an effort in the process of solution, an mi prove the reliability an applicability of the results; M any comparison stu ies bewt een the results obtaine by the two metho s have been con ucte , an show that correlation gra ually ecrease ; C lassification an qualitative escription of gra in size param eters can be use to il lustrate the basic characteristics of grain size is