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| 多次扰动悬浮-沉降条件下湖泊TP及悬浊颗粒变化 |
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陈诺1, 朱伟1, 侯豪2, 刘环2, 许小格2, 朱瑜星1
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1.河海大学环境学院;2.河海大学土木与交通学院
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| 摘要: |
| 实际湖泊一般都经历反复的风浪扰动,这种扰动悬浮-平静沉降的循环往复过程中底泥-水界面过程对湖泊的物质循环产生重要影响。针对扰动悬浮-平静沉降过程中泥-水界面上颗粒物以及磷的变化规律,开展了多次扰动-沉降的反复实验。以振荡格栅作为扰动装置、12 h为周期、共进行10个周期的间歇扰动实验,关注了浊度、TP、DTP以及颗粒的变化规律。实验果表明:在反复悬浮-沉降过程中再悬浮引起的浊度、TP、DTP上升会逐渐减少,扰动强度越大扰动后出现的浊度、TP、DTP峰值的下降越明显。多次扰动后底泥表层团粒的粒径变大,出现了200~400μm左右的大絮团。多次扰动过程中悬浮颗粒和颗粒之间发生“扰动-聚集”作用、颗粒距离接近近,范德华引力增大使颗粒间产生了絮凝,而有机质的存在在颗粒之间产生“架桥作用”助长了更大絮团的形成。 |
| 关键词: 湖泊底泥 底泥释放 再悬浮 TP 絮凝 |
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| Changes of TP and suspended particles in lakes under multiple disturbance suspension-sedimentation conditions |
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Chen Nuo,Zhu Wei,Hou Hao,Liu Huan,Xu Xiaoge,Zhu Yuxing
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: College of Environment,Hohai University
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| Abstract: |
| The actual lakes generally experience repeated wind and wave disturbances, and the mud-water interface process has an important influence on the material circulation of lakes during the cyclic process of suspension and calm settlement. In view of the changes of particulate matter and phosphorus at the mud-water interface in the process of disturbance suspension and calm settlement, repeated experiments of disturbance and settlement were carried out. With the oscillating grating as the disturbance device and 12 h as the period, the intermittent disturbance experiment was carried out for a total of 10 periods, and the change law of turbidity, TP, DTP and particles was paid attention to. The experimental results show that the rise of turbidity, TP and DTP caused by re-suspension will gradually decrease in the process of repeated suspension and settlement, and the greater the disturbance intensity, the more obvious the decline of turbidity, TP and DTP peaks after the disturbance. After repeated disturbance, the particle size of the sediment surface becomes larger, and large floc of about 200~400μm appears. In the process of multiple disturbances, "perturbation-aggregation" occurs between suspended particles and particles, the distance between particles is close to each other, the increase of van der Waals gravity causes flocculation between particles, and the existence of organic matter causes a "bridging effect" between particles, which promotes the formation of larger flocs. |
| Key words: Lake sediments Sediment release Re-suspension TP flocculation |
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