微生物作用下含有机质沉积物起动的定量研究  

Quantitative study on incipient motion of organic sediments with bio-adhesive effect

作　　者：占斯宁 袁栋栋 林永钢 张仪萍[1] 周永潮[1] 张土乔[1] ZHAN Si-ning;YUAN Dong-dong;LIN Yong-gang;ZHANG Yi-ping;ZHOU Yong-chao;ZHANG Tu-qiao(College of Civil Engineering and Architecture,Zhejiang University,Hangzhou,310058,China;Powerchina Environmental Epaperngineering Co Ltd.,Hangzhou,310058,China;Powerchina Roadbridge Group Co Ltd.,Hangzhou,310058,China)

机构地区：[1]浙江大学建筑工程学院,浙江杭州310058 [2]中国电建集团环境工程有限公司,浙江杭州310058 [3]中电建路桥集团有限公司,浙江杭州310058

出　　处：《浙江大学学报（工学版）》2023年第10期2126-2132,共7页Journal of Zhejiang University：Engineering Science

基　　金：国家自然科学基金资助项目(51878597).

摘　　要：为了探究微生物作用对沉积物起动规律的影响,提出考虑微生物培养时间和有机质含量的沉积物临界起动剪切应力计算方法.通过明渠冲刷试验分析了微生物培养时间及有机质含量对沉积物临界起动剪切应力的影响规律;引入絮体强度常数γ值对微生物黏性作用进行定量表征;基于沉积物起动理论,提出在微生物作用下沉积物的临界起动剪切应力经验公式.结果表明,随着微生物作用时间的增加,临界起动剪切应力先增大后减小,并在10或15 d左右达到峰值,最终达到0.072~0.117 N/m^(2).临界起动剪切应力随着有机质含量的增大而减小.微生物黏性作用与γ值呈现显著的负相关,皮尔逊相关系数为−0.767,临界起动剪切应力公式计算值与实验值较为吻合.A calculation method of the critical shear stress considering the microbial incubation time and organic matter content was proposed to study the influence of microbial biofilm on the erosion behavior of sediment.An open channel flume experiment was conducted to analyze the effects of microbial incubation time and organic matter content on the critical shear stress.The stable floc size constantγwas introduced to quantify the bio-adhesive effect.An empirical formula for the critical shear stress of sediment initiation with organic matter under microbial activity was proposed based on the theory of sediment initiation.Results showed that the critical shear stress increased first and then decreased over time.The peak value was reached around 10 or 15 days,and the critical shear stress reached 0.072~0.117 N/m^(2).The critical starting shear stress decreased with the increase of organic matter content.The correlation between the bio-adhesive effect andγwas calculated and a significant negative correlation was found.Pearson correlation coefficient was−0.767.The calculated value of the critical starting shear stress formula was in good agreement with the experimental value.

关 键 词：沉积物 微生物活动 有机质含量 临界起动剪切应力 絮体强度 

分 类 号：TV142.1[水利工程—水力学及河流动力学]