منابع مشابه
Deleterious Constituents of Indiana Gravels
This paper reports the results of tests on Indiana gravels ranging from good to poor in field performance in Portland cement concrete. The gravels were separated by heavy liquid flotation into various specific gravity ranges. The gravel fractions thus obtained were tested to deter mine absorption, specific gravity, degree of saturation, lithologic compo sition and durability in air entrained ...
متن کاملPhosphorus Sorption by Gravels in Lateritic Soils
t The effect of sesquioxidic i i ic gravels (>2 mm size fraction) on phosphorus sorption by two gravelly lateritic soils was investigated by phosphorus sorption experiments, X-ray diffraction, ti , autoradiography and electron microscopy. In one soil the abundance and size of gravels l decreased downslope. As the gravel content of both soils increased (13-61%), ), the proportion of large (>8 mm...
متن کاملEntrainment, Displacement and Transport of Tracer Gravels
The mass and size distribution of grain entrainment per unit bed area may be measured by replacing a volume of the bed with tracer gravels and observing the mass difference before and after a transport event. This measure of spatial entrainment is relevant to any process involving size-selective exchange of sediment between transport and bed and may be directly used in calculations of sediment ...
متن کاملLow-frequency sound wave parameter measurement in gravels
0003-682X/$ see front matter 2009 Elsevier Ltd. A doi:10.1016/j.apacoust.2009.07.003 * Corresponding author. Tel.: +1 217 352 6511. E-mail address: [email protected] (G.W. Swen Experiments were performed to measure the various sound-wave propagation parameters of two kinds of gravel, a crushed limestone and a stream-formed ‘‘pea gravel”, at frequencies between 25 and 200 Hz. The apparatus w...
متن کاملThe Spatial Variation and Routine Sampling of Spawning Gravels in Small Coastal Streams
The size distribution of the sediments in the bed of a stream channel is a significant characteristic of fish habitat. Spawning gravels are sampled during habitat assessments and monitoring programs. Within a given stream, effective, representative sampling requires a clear understanding of the spatial variation of spawning gravel characteristics. This study documents and explains the spatial v...
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ژورنال
عنوان ژورنال: Nature
سال: 1882
ISSN: 0028-0836,1476-4687
DOI: 10.1038/027102b0