Parameter Analysis on Grain Size Distribution of Streambed Sediment in the Weihe River of Shaanxi Province
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Abstract:
Estimation of grain size distribution is of great importance in determination of streambed hydraulic conductivity. In this paper, streambed sediment samples from five study locations including Meixian, Xianyang, Caotan of Xi an, Lintong, and Huaxian in the Weihe River were collected. The parameter characteristics of grain size distribution for those sediment samples were analyzed and compared using the Graphical Method of Folk-Ward formula and McManus moment method. The results showed that the average particle diameter and separation coefficient of those sediment samples from the five sites have the same variation but high difference of skewness and kurtosis. Except for the Caotan of Xi’an station, the grain size distribution of streambed sediments from other four sites is in normal distribution based on the graphical method. However, the skewness and kurtosis values ??calculated by the moment method exceed the predetermined ranges. Comparatively, the graphical method is more suitable for the grain size analysis of streambed sediments in the Weihe River.
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