Visual accumulation tube for size analysis of sands
The visual-accumulation-tube method was developed primarily for making size analyses of the sand fractions of suspended-sediment and bed-material samples. Because the fundamental property governing the motion of a sediment particle in a fluid is believed to be its fall velocity. the analysis is designed to determine the fall-velocity-frequency distribution of the individual particles of the sample. The analysis is based on a stratified sedimentation system in which the sample is introduced at the top of a transparent settling tube containing distilled water. The procedure involves the direct visual tracing of the height of sediment accumulation in a contracted section at the bottom of the tube. A pen records the height on a moving chart. The method is simple and fast, provides a continuous and permanent record, gives highly reproducible results, and accurately determines the fall-velocity characteristics of the sample. The apparatus, procedure, results, and accuracy of the visual-accumulation-tube method for determining the sedimentation-size distribution of sands are presented in this paper.
Citation Information
Publication Year | 1956 |
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Title | Visual accumulation tube for size analysis of sands |
Authors | B.C. Colby, R.P. Christensen |
Publication Type | Article |
Publication Subtype | Journal Article |
Series Title | Journal of the Hydraulics Division of the American Society of Civil Engineers |
Index ID | 70047827 |
Record Source | USGS Publications Warehouse |