Wang Chunliu, Zhou Xinyue, Tian Linqi, Wu Wenbin, Zhao Zheng, Wang Changhui, Song Na, Zhou Xiaohong, Huang Lei, Fang Hongwei, Jiang Helong
School of the Environment and Safety Engineering, Jiangsu University, Zhenjiang, Jiangsu, 212013, China; State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing, 210008, China.
College of Biology and the Environment, Nanjing Forestry University, Nanjing, 210037, China.
J Environ Manage. 2025 Aug;390:126283. doi: 10.1016/j.jenvman.2025.126283. Epub 2025 Jun 20.
Large shallow lakes have been plagued by issues such as eutrophication and low water transparency, most of which are related to sediment suspension. Fluid sediment on the surface is gradually receiving attention due to its low density. Here, a typical large shallow lake, the Taihu Lake, was selected to conduct on temporal and spatial variation in surface fluid sediment. Through collecting sediment column samples in different lake areas during four seasons, the surface fluid sediment properties were analyzed. The results indicated that the northwest lake area was covered with fluid sediment in four seasons. And the fluid sediment coverage areas in January and October were larger than that in April and July. In order to understand the changes in sediment structure, we calculated the proportions of sediment components and measured the sediment particle size distribution and organic matters contents. According to the pairwise comparisons and structural equation model (SEM) analysis, it can be concluded that sediment particle size, density, and organic matters jointly affected sediment stability. And sediment D was the main driving force affecting sediment yield shear stress (τ). Then sediment critical shear stress (τ) was calculated combined with τ to clarify the sediment suspension capacity. Overall, the results can deepen our understanding of the fluid sediment properties in lakes, and help with the restoration and management of lake sediment.
大型浅水湖泊一直受到富营养化和水体透明度低等问题的困扰，其中大部分问题与沉积物悬浮有关。表层的流动性沉积物因其低密度而逐渐受到关注。在此，选取了典型的大型浅水湖泊太湖，对表层流动性沉积物的时空变化进行研究。通过在四个季节采集不同湖区的沉积物柱状样本，分析了表层流动性沉积物的性质。结果表明，太湖西北湖区四季均有流动性沉积物覆盖。1月和10月的流动性沉积物覆盖面积大于4月和7月。为了解沉积物结构的变化，我们计算了沉积物成分的比例，测量了沉积物的粒度分布和有机物含量。通过成对比较和结构方程模型（SEM）分析，可以得出沉积物粒度、密度和有机物共同影响沉积物稳定性。沉积物D是影响沉积物产沙剪应力（τ）的主要驱动力。然后结合τ计算沉积物临界剪应力（τ），以阐明沉积物的悬浮能力。总体而言，研究结果可以加深我们对湖泊中流动性沉积物性质的理解，并有助于湖泊沉积物的恢复和管理。
