基于电解质浓度参数的泥沙沉速公式研究  

Study on the formula of flocculation setting velocity based on electrolyte concentration parameters

作　　者：张宇卓[1,2] 张根广 李青[1] 史志鹏 ZHANG Yu-zhuo;ZHANG Gen-guang;LI Qing;SHI Zhi-peng(College of Water Resources and Architectural Engineering,Northwest A&F University,Yangling 712100,China;Huadong Engineering Corporation Limited,Hangzhou 311122,China)

机构地区：[1]西北农林科技大学水利与建筑工程学院,陕西杨凌712100 [2]中国电建集团华东勘测设计研究院,浙江杭州311122

出　　处：《泥沙研究》2020年第3期1-7,45,共8页Journal of Sediment Research

基　　金：国家自然科学基金项目(51879227,51279170)。

摘　　要：电解质含量是影响黏性细沙絮凝现象及絮凝体清浑水交界面沉速的主要因素。基于黏性细沙沉降试验,引入Image-Pro Plus图像处理软件与MATLAB编程软件,采用自动定义阈值与盒计维数计算方法,得到了不同泥沙浓度及电解质浓度下的絮凝体孔隙率ε与分形维数D;结合吸附等温方程,建立了含有电解质浓度参数的黏性细沙絮凝体的沉速公式,并用实测沉速值对公式进行了验证,结果表明,计算值与实测值符合良好。Electrolyte concentration is the main factor to affect the flocculation and settling velocity of fine sediment. Based on the sediment flocculation process analysis,the porosity and fractal dimension of flocs by defining threshold automatically and box-counting method by means of Image-Pro Plus and MATLAB programming are calculated. The porosity and fractal dimension of the flocs under the concentration of different sediment and electrolyte are determined. Moreover,a setting formula of flocculation with parameter of electrolyte concentration is derived based on isothermal adsorption equation,and it is showed that computed result by the formula in this paper is agree with the measured data.

关 键 词：电解质 絮凝体 沉速 分形维数 孔隙率 

分 类 号：TV142.1[水利工程—水力学及河流动力学]