河流泥沙粒径计法分析成果改正方法的实验研究

An Experimental Study on Correction Methods for Determination of River Sediment Particle Size by Using Particle Size Meter

根据国家行业标准《河流泥沙颗粒分析规程》规定“粒径计分析成果，受群体沉降和扩散影响，应根据标样实验分析确定的方法进行校正”的要求，采集全国代表性河流１６个测站的悬沙样品，对粒径为０．０６２～０．５ｍｍ分析范围的粒径计法，以单颗沉降分析法为标准进行对比实验，据以确定粒径计法分析成果的改正方法。

According to the National Technical Standard for Determination of Sediment Size in Open Channels, determination results by using method of particle size meter should be corrected based on the experimental analysis of standard samples due to influence of mass fall and diffusion. In this study, suspended sediment samples at 16 representative stations over China are collected and the grain size ranges from 0.062 to 0.5mm. The determination results by using method of particle size meter are contrasted with single particle fall analysis method which is used as the standard method. Then correction methods are presented and results can fully satisfy the standard of the quality examination in particle size analysis.