Densities of Wet Aggregated Sediment from Different Textured Soils1
- F. E. Rhoton,
- L. D. Meyer and
- F. D. Whisler2
The density of wet aggregated sediment is a major factor controlling its fluvial transport and deposition. Since this property varies depending on the volume of aggregate pores filled with water, the use of dry aggregate densities in sediment transport studies may result in significant underestimations of wet sediment densities and consequently overestimations of transport distances. Therefore, this study was conducted to measure the densities of wet aggregates that exist during fluvial transport of sediment from agricultural soils. Samples from six soils, ranging in texture from silty clay to sandy loam, were wetted and agitated to simulate the stresses of raindrop impact. Two size ranges (1.00 to 0.50, and 0.50 to 0.25 mm) were collected from this sediment by wet sieving, then drained at a suction of 50 cm of water and weighed. The sediment volume was measured to the nearest 0.05 mL in a displacement vessel. Wet aggregate densities approximated 2.0 Mg/m3 and varied little among soils, or between the two size ranges. No variations in aggregate density could be directly attributed to differences in aggregate textures.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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