黄河宁蒙河段沙样粒度与分形维数特征  

Characteristics of the grain sizes and fractal dimensions for sand samples in Ningxia-Inner Mongolia section of the Yellow River

作　　者：管清玉[1] 桂洪杰[1] 潘保田[1] 王丽娟[1] 刘子变[1] 

机构地区：[1]兰州大学,资源环境学院,西部环境教育部重点实验室,兰州730000

出　　处：《兰州大学学报（自然科学版）》2013年第1期1-6,共6页Journal of Lanzhou University(Natural Sciences)

基　　金：国家重点基础研究发展计划(973计划)项目(2011CB403301);国家自然科学基金项目(41171015)

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.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 dorainated 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

关 键 词：沙漠 粒度 分形维数 宁蒙河段 黄河 

分 类 号：P941.73[天文地球—自然地理学]