模拟扰动条件下太湖沉积物的再悬浮特征  

Characteristics of sediment resuspension in Taihu Lake under simulative disturbing conditions

作　　者：王鹏[1,2] 王胜艳[2] 郝少盼[2] 姚琪[2] 汤露露[2] 

机构地区：[1]河海大学浅水湖泊综合治理与资源开发教育部重点实验室,江苏南京210098 [2]河海大学环境学院,江苏南京210098

出　　处：《水科学进展》2010年第3期399-404,共6页Advances in Water Science

基　　金：国家重点基础研究发展计划(973)资助项目(2008CB418202);国家水体污染控制与治理科技重大专项(2008ZX07101-001);浅水湖泊综合治理与资源开发教育部重点实验室开放研究基金(2007KJ001);河海大学自然科学基金(2008427711);中央高校基本科研业务费专项资金资助~~

摘　　要：采用沉积物再悬浮振荡器在0.2-0.5 N/m^2的切应力和60-1800 s的持续振荡时间下,对太湖沉积物原状芯样的再悬浮特征开展模拟实验研究,揭示切应力大小和外力作用时间对沉积物再悬浮的影响。实验结果表明,振荡初期,上覆水中悬浮物浓度上升速率较快,随振荡时间延长,上升速率减缓,浓度趋于稳定;且浓度上升速率随切应力增加呈显著增大趋势。此外,悬浮物沉降通量随振荡时间而增大,而再悬浮通量呈相反变化趋势,两者的时间变化曲线逐渐接近,最终达到动态平衡。室内模拟试验观测值与太湖现场观测结果的对比表明,该模拟装置能够在室内可控条件下较好地反映太湖沉积物再悬浮特征。The characteristic of sediment resuspension is investigated under simulative disturbing conditions.The sediment core samples collected from the Taihu Lake were run in the particle entrainment simulator at simulated bed-flow shear stresses from 0.2 to 0.6 N/m^2 for the period of vibration varying from 60 to 1800 seconds.Results show that the concentration of suspended particulate matter（SPM） in the overlaying water rises at a fast rate initially.The higher the simulated bed-flow shear stress is,the faster the rising rate will be.The rising rate slows gradually and will be stabilized as time progressed.In addition to the divergence of sediment resuspension,the convergence of SPM will increase over time until the two processes in the particle entrainment simulator reach dynamic equilibrium.Our indoor experiment portrays well the characteristic of sediment resuspension observed in Taihu Lake,which demonstrates the applicability of using the particle entrainment simulator to studying the dynamic of sediment resuspension in laboratories.

关 键 词：浅水湖泊 风浪扰动 剪切应力 悬浮颗粒物 太湖 

分 类 号：TV142.1[水利工程—水力学及河流动力学]