寸滩水文站悬沙现场测量级配与室内级配对比分析

Comparison between Malvern MS2000 and LISST-100X in Particle Size Measurement at Cuntan Station

LISST-100X是目前先进的现场测沙仪器，可以现场快速的测量出水体中的泥沙颗粒级配，应用于内陆河流处于摸索阶段。本文在寸滩水文站含沙量小于1．0kg·m^-3的条件下，通过用LISST-100X在采样现场测量悬移质颗粒级配，用MS2000（马尔文）在室内分析悬移质颗粒级配。当中值粒径为8—15μm时．两者测量结果有大有小．累计体积百分数也反映出同样的结果；只有在中值粒径为12-15μm时．MS2000与LISST数据吻合较好。通过对两个仪器测量原理对比以及悬移质特性等进行分析，本文对产生这样的结果的可能原因进行了分析和探讨。

When the silt content is less than 1.0 kg/m3 at the Cuntan station, the measurement of suspended sediment particle grade was re-spectively made by LISST-100X at site and by MS2000 indoor. Comparing the median particles size in the range of 8-15μm, the data obtained by the two approaches were different. Meanwhile, the percent of the accumulative total volume also reflected the same conclusion. Only when the median particles size ranged from 12 tol5μm, data from MS2000 and LISST agreed well. After comparing the surveying principles of the two apparatuses, and analyzing the characteristics of the suspended silt, the possible reasons caused this results were analyzed and discussed.