摘要
强烈波浪作用在河口海岸区域引发海底沉积物的剧烈扰动,所形成的近底高浓度浑水体可汇集成海底浊流,在污染物和含碳物质自近海向远海输运方面起着重要作用,是陆海相互作用的重要驱动力。而近底高浓度含沙层因含沙量及其中组分的不同,其流动性亦不同。针对海底可能存在的高浓度含沙层,采用流变试验,通过剪切速率-剪切应力间的流变关系对不同含沙量下的粉土浑水体进行流变特性分析,并结合前人所做的不同粉粒黏粒比例、不同含量的浑水体流变测试结果,将粉土浑水体在100~1 350kg/m3含沙量范围内划分为牛顿流体、过渡流体和宾汉流体三种流体类型,给出了以粉粒与黏粒组分为主的含沙浑水体的流变性质变化界限图,为近底高浓度含沙层运动研究提供流体性质分类参照。
The near-bottom high-concentration muddy water bodies of sea bottom sediments in the estuarine and coastal areas,resulting from violent disturbance triggered by strong wave action,can give rise to undersea turbidity current,which plays an important role in transporting pollutants and carbonaceous matters from offshore areas to abyssal sea and also serves as one of the important forces driving land-sea interaction.The fluidity of near-bottom high-concentration sandy layers varies with different sand contents and constituents.Based on shear rate-shear stress relationship,this study analyzed the rheological properties of silt and muddy water with different sand concentration.Combined with the rheological test results of muddy water with different powder and clay ratios and different contents made by predecessors,the silt muddy water is subdivided into Newtonian,transitional and Bingham fluids in the range of 100—1350 kg/m3 sediment concentration,and the changing limit diagram of rheological properties of silt-laden muddy water with silt and clay components is given,which provides a reference for the classification of fluid properties in the study of near-bottom high-concentration sediment-laden layer movement.
作者
程子睿
任宇鹏
张子涵
田浩
许国辉
CHENG Zirui;REN Yupeng;ZHANG Zihan;TIAN Hao;XU Guohui(Key Laboratory of Marine Environment and Ecology,Ministry of Education,Ocean University of China,Qingdao 266100,China;Shandong Provincial Key Laboratory of Marine Environment and Geological Engineering,Ocean University of China,Qingdao 266100,China;College of marine geosciences,Ocean University of China,Qingdao 266100,China)
出处
《海洋科学进展》
CAS
CSCD
北大核心
2023年第2期246-256,共11页
Advances in Marine Science
基金
国家自然科学基金项目(41976049)
中央高校基本科研业务费专项(202061033)。
关键词
高浓度含沙层
粉黏比
流变特性
强烈波浪作用
sediment with high-concentration
silty-clay ratio
rheological behavior
intense wave action
