【摘要】 采用分形理论与线性回归方法研究了黄河宁蒙河段附近地区沙漠表层沙样的粒度及其分形维数特征,发现其机械组成中以细砂、粉砂为主,粒度分形维数值与砂粒呈反相关关系,与粉粒、黏粒呈正相关关系.从腾格里沙漠沿河而下直到库布齐沙漠,4个沙区的分选系数、粒度分形维数值依次减小,并且两者呈现较好的正相关关系.在粒度及分形维数分析结果中,0.10 mm粒径是一个重要的分界值.更多还原

【Abstract】 The fractal theory and the linear regression method were used to analyze the grain sizes and fractal dimension features of surface sand samples from the regions near Ningxia-Inner Mongolia section of the Yellow River.The result showed that the mechanical composition of these samples was mainly dominated by fine sand and silt.The fractal dimension values were positively correlative with the sand,but negatively with the silt and clay.From the Tengger Desert to the Hobq Desert along the Yellow River,the sorting coefficients and grain-size fractal dimension values were gradually reduced,and they had a good positive correlation with each other.The 0.10 mm grain size was the important demarcation in the analysis results.更多还原