泥沙颗粒的粒径谱分析——以长江口泥沙为例  

Size spectral analysis of sediment particles——case study of Yangtze River estuary sediment

作　　者：周晶晶[1] 张长宽[1] 薛鸿超[2] 

机构地区：[1]河海大学港口海岸与近海工程学院,江苏南京210098 [2]河海大学海岸及海洋工程科研所,江苏南京210098

出　　处：《泥沙研究》2012年第6期19-25,共7页Journal of Sediment Research

基　　金：国家"973"项目(2010CB29001);高等学校博士学科点专项科研基金(20110094120020)

摘　　要：引入粒径谱函数的颗粒分析方法,改进以往粒径累积频率曲线中无法用数字关系式表达的缺陷,标准化后的标准谱函数参数可简化为唯一的谱宽指数,更直观地反应粒径级配关系,使颗粒分析具有统一的标准。研究表明:粒径的粗细、均匀程度等特征值均可用数学形式表达。已采集的长江口分析沙样,属细颗粒泥沙范畴。谱函数参数:粗度A<1,泥沙越粗A值越大,其变化范围在0.22～0.66之间;非均匀度B>1,泥沙越不均匀B值越大,B值范围在1.05～2.93之间;长江口泥沙谱宽指数b值在0.05～0.66之间。实验及其分析计算结果显示各取样点泥沙的特征值差距较大,表明长江口泥沙粒径在粗细及均匀程度上有所差异。The size standard spectral function is applied to sediment size analysis. The traditional size cumula- tive frequency curves are improved that the parameter is simplified to one single spectral width exponent by spectral function＇s standardization. It shows that the size grades are more intuitionistic, and it also makes size analysis a uniform standard. The research shows that the size thickness and uniformity can be expressed with a numerical format. It causes a better comparability. The sediment collected from the Yangtze River estuary be- longs to fine grain category. The parameters of spectral function are thickness A 〈 1 and non-uniformity B 〉 1, and both of them are directly proportional to the numerical values. A ranges from 0.22 to 0.66 and B ranges from 1.05 to 2.93. As the only index of size standard spectral function, the spectral width ranges from 0.05 to 0.66. Based on the experiments and analysis results, the discrepancy among eigenvalues of each sampling point is biggish. And it shows that the thickness and uniformity are different in the Yangtze River estuary.

关 键 词：泥沙 粒径谱 颗粒分析 长江口 谱宽指数 

分 类 号：TV141[水利工程—水力学及河流动力学]