振荡扩散湍流中稀悬浮泥絮凝体特性的实验室研究

4区 地球科学 Q3 Earth and Planetary Sciences
N. Gratiot, A. Manning
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引用次数: 12

摘要

GRATIOT, N. and MANNING, A. J., 2007.在振荡扩散湍流中稀释悬浮泥絮凝特征的实验室研究》,SI 50(第 9 届国际沿海研讨会论文集),1142 - 1146。澳大利亚黄金海岸,ISSN 0749.0208 为进一步了解泥浆絮凝,COSINUS 项目资助了一系列实验室实验,在有机玻璃槽中使用振荡栅格对稀泥悬浮液进行剪切(3.7 秒 -1 - 约 20 秒 -1 之间),标称浓度范围为 200-600 毫克升 -1 。然后使用 LabSFLOC 仪器检测絮凝物的特性。结果表明,对于暴露在高剪切力下的低浓度天然塔马河口(英国)淤泥,最大的絮体略小于约 220 μm 的柯尔莫哥洛夫涡流尺寸。高剪切导致所有絮凝物的沉降速度仅为 0.6 mm s -1 。对于相同的泥浆,降低剪切力可改善絮凝效果,并将大型絮凝体的沉降速度提高到 1.8 mm s -1 。这意味着大絮体占絮体质量的 64%,占沉降通量的 80%。相比之下,低浓度天然吉伦特泥在每个剪切增量下的大絮凝体沉降速度明显快于添马舰泥,但最大絮凝体的数量级与添马舰泥絮凝体相同。悬浮物分布显示,大絮凝体只占颗粒质量的 20-30%。然而,它们较快的沉降速度将较低的大絮凝体质量转化为 62% 的沉降通量。去除吉伦特淤泥中的有机物后,直径超过 125 μm 的絮体很少。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
A Laboratory Study of Dilute Suspension Mud Floc Characteristics in an Oscillatory Diffusive Turbulent Flow
GRATIOT, N. and MANNING, A. J., 2007. A Laboratory Study of Dilute Suspension Mud Floc Characteristics in an Oscillatory Diffusive Turbulent Flow, SI 50 (Proceedings of the 9th International Coastal Symposium), 1142 – 1146. Gold Coast, Australia, ISSN 0749.0208 To further the understanding of mud flocculation the COSINUS project funded a series of laboratory experiments whereby dilute mud suspensions were sheared (between 3.7 s -1 - about 20 s -1 ) with nominal concentrations ranging from 200-600 mg l -1 , within a Plexiglas tank, using an oscillating grid. The floc properties were then examined using the LabSFLOC instrument. Results showed that for low concentrations of natural Tamar estuary (UK) mud exposed to high shear, the largest flocs were slightly less than the Kolmogorov eddy size of about 220 μm. The high shear resulted in all flocs having settling velocities of only 0.6 mm s -1 . Lowering the shear for the same mud improved flocculation, and raised the macrofloc settling velocity to 1.8 mm s -1 . This translated into macroflocs constituting 64% of the floc mass, and 80% of the mass settling flux. In contrast, low concentrations of natural Gironde mud displayed significantly faster settling macroflocs at each shear increment than Tamar mud, but the largest flocs were of the same order as the Tamar mud flocs. The suspended matter distribution showed the macroflocs only constituted 20-30% of the particulate mass. However, their faster settling rate transformed the low macrofloc mass into 62% of the settling flux. The removal of organic matter from the Gironde mud resulted in few flocs exceeding 125 μm in diameter.
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来源期刊
Journal of Coastal Research
Journal of Coastal Research 地学-地球科学综合
自引率
0.00%
发文量
87
审稿时长
3-8 weeks
期刊介绍: The Journal of Coastal Research (JCR) is one of the leading international journals for coastal studies and processes, and is published bi-monthly by the Coastal Education & Research Foundation [CERF]. By covering the entire field of coastal research, the JCR encompasses all subjects relevant to natural and engineered environments (freshwater, brackish, or marine) and the protection/management of their resources in the vicinity of coastlines of the world. Even though the journal broadly focuses on immediate shoreline zones, the JCR also embraces those coastal environments that either reach some indefinite distance inland or that extend seaward beyond the outer margins of the sublittoral (neritic) zone. The JCR disseminates accurate information to both the public and research specialists around the world on all aspects of coastal issues in an effort to maintain or improve the quality of our planet''s shoreline resources.
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