剥谱方法解析海洋沉积物粒径谱  

Determination of Grain-size Components by Spectrum Stripping Method

作　　者：李冬梅[1] 刘广山[1] 杨世纶[2] 

机构地区：[1]厦门大学海洋学系,福建厦门361005 [2]河口海岸国家重点实验室华东师范大学,上海200062

出　　处：《厦门大学学报（自然科学版）》2005年第6期810-814,共5页Journal of Xiamen University：Natural Science

基　　金：国家自然科学基金重点项目(40036010)资助

摘　　要：建立了剥谱解析沉积物粒径谱方法,该方法用高斯函数表示每个组分的粒径谱,由总谱数据确定高斯函数参数.应用该方法对胶州湾沉积物粒径谱进行了分析.分析结果显示:胶州湾不同站点沉积物的细粒径组分比较相似,显示其来源一致性;粗粒径组分则随着采样站点的不同存在显著的差异.Most grain-size spectra of marine sediments are polymodal distribution that means the sediment is composed of diverse components and they often overlapped each other and each component may obey some type of distribution. In this paper, it is considered that single component of sediment obey Gauss distribution. The number of components is determined by the maximum of differential curve of measured grain-size distribution and zero-cross points of first-difference of curve. Each component can be determined by stripping the spectrum of measured differential grain-size curve and the parameters of Gauss function of single component can be estimated by unoverlopped or overlapped only a little segment that always has one component and often is more coarse grain-size one. The grain-size spectra of sediments collected from Jiaozhou bay have been resolved by this method. The results show that the mean grain sizes of fine components in sediments of Jiaozhou bay are closed but their contents are obviously difference. The mean grain sizes and contents of coarse components in them are all of difference.

关 键 词：海洋沉积物 剥谱 粒径组分 

分 类 号：P736.21[天文地球—海洋地质]