Grading and Surface Characteristics of Sediments in the Poyang Lake and Yangtze River
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Abstract:
The surface characteristics of sediments are important to understand the environmental impact of sediments. In order to investigate the effects of grain size and grading of different origins on surface properties of sediments, sediment samples were collected from the Poyang-Yangtze Waterway and Yangtze River in Nanjing, respectively. The sediments were divided into four particle-size fractions: 0-30μm, 30-62μm, 62-90 μm, and 90-125μm, and then the surface properties (specific surface area, pore volume, and pore diameter) were investigated. The results showed that (1) the sediments in the Poyang Lake and Yangtze River are mainly clay, silt, and fine sand, and the specific surface area is from 3.2 to 25.12 m2/g, indicating that the sediments are mesoporous materials; (2) the specific surface area is in a power exponent relationship with grain size, and it decreases with the increasing of grain size for silt and clay; (3) the relationship between the median grain size of mixing sediments and specific surface area is similar to that of grading sediments, with a slightly higher magnitude; and (4) the values of axial ratio and relative surface area increase along with the increasing of median diameter, and the increasing rates of axial ratio and relative surface area are much higher when the median grain size is in the range of 0~15 μm.
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