泥沙研究2019，Vol.44Issue(2)：18-25,8.DOI:10.16239/j.cnki.0468-155x.2019.02.003
紊动对黏性细颗粒泥沙絮凝沉降影响的试验研究
Study on the effects of turbulence on cohesive sediment flocculation and settling properties
摘要
Abstract
Influences of suspended load concentration and turbulent shear rate on flocculation and floc settling properties were studied by using annular flume and camera system. It was found that floc sizes were a few to a few ten times larger than primary particle size, and the median floc size increased at first, and then decreased with the increasing of turbulent shear rate. The maximum median floc size about 150 μm occurred under the shear rate of 30 1/s. The increase of suspended sediment concentration is benefit to the development of flocculation, with higher median floc size under higher concentration. The median floc settling velocity was in the range of 0.7～3.4 mm/s, and the maximum value was measured under the highest shear rate of 65 1/s, because flocs formed under this condition were denser. Floc effective density decreased with the increase of floc size, and the simulations using variable fractal dimension fit well with the experimental results.关键词
泥沙絮凝/紊动剪切/沉速/有效密度Key words
sediment flocculation/turbulent shear rate/settling velocity/effective floc density分类
建筑与水利引用本文复制引用
郭超,何青,郭磊城,王宪业..紊动对黏性细颗粒泥沙絮凝沉降影响的试验研究[J].泥沙研究,2019,44(2):18-25,8.基金项目
国家自然科学基金项目(51320105005,51739005) （51320105005,51739005）
华东师范大学研究生海外短期研修专项基金(40600-511232-14204/003) （40600-511232-14204/003）
河口海岸学国家重点实验室出国访学基金(44KZ001K) （44KZ001K）
国家重点研发计划项目(2016YFE0133700) （2016YFE0133700）
