Comparative Analysis of Grain Size Measurement Techniques in Sedimentology

Abstract

Grain size represents a crucial structural attribute of sediments and serves as the foundation for their classification and nomenclature. Currently, the predominant methods for grain size analysis and testing include the laser diffraction method, sieve analysis, image analysis, and sedimentation method. Each technique relies on distinct characteristics of the grains, leading to variations in measurement outcomes for the same sample. These methods present limitations in terms of accuracy or detection range. Specifically, the laser diffraction method covers a range from 0.00005 mm to 3.5 mm, sieve analysis spans from 0.1 mm to 1000 mm, image analysis from 0.1 mm to 20 mm, and the sedimentation method ranges from 0.00005 mm to 0.1 mm. Furthermore, each method is applicable to different types of samples: the laser diffraction, sieve analysis, and sedimentation methods are appropriate for samples with moderate or lower degrees of cementation, while the image analysis method is more versatile. Consequently, selecting an appropriate measurement technique based on the sample's characteristics or the specific measurement requirements is essential.