摘要
通过分析絮团在沉降过程中所受不同性质的力与絮团形状参数之间的关系,提出了一套新的絮团粒径定义方法.以两种不同性质的泥沙为对象,使用新定义与传统的等效圆定义分别计算了泥沙絮团二维图像的粒径,并对比了两种结果的优劣.研究结果表明:与传统定义相比,新定义的计算结果更加符合实测沉速的分布规律,计算精度也有较大幅度提升;当计算形状不规则絮团的沉速时,提升幅度要明显大于平均提升幅度;与传统定义相同,当使用新定义计算絮团沉速时,小颗粒絮团的计算结果要优于大颗粒絮团.
A method for calculating floc size was proposed based on the analysis of relationship be- tween different forces and floe shape parameters. Images of sediments from two different sources were analyzed to determine the size of floes using the developed method and a traditional method while a comparison was conducted between these two methods. Research results show that results obtained by the proposed method are more in accord with the observed settling velocity and also have a signifi- cant increase in precision. The range of increase when calculating irregular floes is greater than average. In addition, this method has a better performance on small flocs than larger ones.
作者
赵金箫
杨国录
Zhao Jinxiao gang Guolu(School of Water Resources and Hydropower Engineering, Wuhan University, Wuhan 430072, Chin)
出处
《华中科技大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2017年第7期41-45,共5页
Journal of Huazhong University of Science and Technology(Natural Science Edition)
基金
水体污染控制与治理科技重大专项资助项目(2014ZX07104-005)
关键词
细颗粒泥沙
黏性
絮团粒径
絮凝
沉速
有效密度
cohesive sediment
fine
floc size
flocculation
settling velocity
effective density
