图像分析粘性细颗粒泥沙絮体孔隙初探  

Study of floc pores of viscous fine sediment by image analysis

作　　者：柴朝晖[1] 杨国录[1,2] 陈萌[1] 李野[2] 何姝[2] 

机构地区：[1]武汉大学水资源与水电工程科学国家重点实验室污淤泥研究中心,湖北武汉430072 [2]武汉大学宇星公司水利环境工程技术研究中心,湖北武汉430072

出　　处：《泥沙研究》2011年第5期24-29,共6页Journal of Sediment Research

基　　金：武汉大学自主科研项目(5081010)

摘　　要：以细颗粒含量较高的滇池底泥为例,利用SEM图像分析法和统计学方法,研究了粘性细颗粒泥沙絮体孔隙大小、形状及孔径分布,同时探讨了絮体孔隙大小及孔径分布与絮体沉速之间的关系。实验结果表明:粘性细颗粒泥沙絮体孔隙一般属于毛细管孔隙,孔隙投影面的形状近圆形;自然状态下絮体孔隙孔径近似呈对数正态分布;加入絮凝剂后,呈对数偏态分布;絮体沉速与絮体孔隙的大小和孔径分布具有较强的相关性。Taking the silt in the Dianchi Lake which includes lots of fine sediments as an example, the paper uses the image analysis and statistics methods to study the pore size, shape and diameter distribution of floes. Meanwhile, it discusses the relationship between size of floe pore, the pore diameter distribution, and the settling velocity of fine sediment floes. It concludes that the pores of fine sediment floes belong to the kind of capillary pore, the shape of pore projection is close to a circle, the distribution of floe pore apertures follows logarithmic normal distribution in natural condition; when some flocculants are added, it follows logarithmic skew distribution, and the settling velocity of floe has a strong pertinence with the size and distribution of fine sediment floe pores.

关 键 词：细颗粒泥沙 絮体孔隙 图像分析 沉降速度 

分 类 号：TV142.1[水利工程—水力学及河流动力学]