摘要
黏性细颗粒泥沙是鄱阳湖悬浮物的主要组成部分,其絮凝作用对鄱阳湖泥沙冲淤及湖床演变具有明显影响。采用鄱阳湖湖区泥沙的现场样品,通过室内泥沙静水沉降试验对鄱阳湖黏性细颗粒泥沙的絮凝特性进行了分析。研究结果表明,鄱阳湖黏性细颗粒泥沙絮凝临界粒径为0.028 mm;黏性细颗粒泥沙沉降过程包括分选沉降、絮凝沉降和絮凝平衡三个阶段,含沙量越大,絮凝沉降加速阶段持续时间越长。含沙量对絮凝沉速的影响存在临界现象。含沙量0~3 kg/m^(3)范围内絮凝沉速随含沙量增加而增加,而3~5 kg/m^(3)含沙量时对絮凝沉速的影响已不明显。
Cohesive fine sediment composed the main part of the suspended solids in the Poyang Lake.Flocculation shows a significant influence on the erosion and deposition processes of the lakebed.In this paper,by carrying laboratory static water sediment test of filed samples from Poyang Lake,flocculation properties are analyzed.The results show that the critical flocculation particle size for cohesive fine sediment in the Poyang Lake is about 0.028 mm;its sedimentation can be divided into three stages as sorting settlement,flocculation settlement and flocculation equilibrium.The duration of the flocculation settlement increases with the increase of sediment concentration;the sediment concentration has a critical value on its influence on flocculation settling velocity.Within 0~3 kg/m^(3),the flocculation settling velocity increases with the increase of sediment concentration,while in the range of 3~5 kg/m^(3),the influence of sediment concentration on flocculation settling velocity is not obvious.
作者
黄志文
杨春瑞
邓金运
陈璐
HUANG Zhi-wen;YANG Chun-rui;DENG Jin-yun;CHEN Lu(Jiangxi Academy of Water Science and Engineering,Nanchang 330029,China;State Key Laboratory of Water Resources and HydropowerEngineering,WuhanUniversity,Wuhan430072,China)
出处
《泥沙研究》
CAS
CSCD
北大核心
2022年第6期29-34,共6页
Journal of Sediment Research
基金
国家重点研发计划项目(2018YFC0407201)
江西重大科技研发专项(20213AAG01012)
江西水利科技重点项目(202224ZDKT13)。
关键词
鄱阳湖
黏性细颗粒
沉降
絮凝
Poyang Lake
cohesive fine sediment
settling
flocculation
