| 陈洪松,邵明安.NaCl对细颗 粒泥沙静水絮凝沉降动力学模式的影响[J].水利学报,2002,33(8):0063-0068 |
| NaCl对细颗 粒泥沙静水絮凝沉降动力学模式的影响 |
| Effect of NaCl concentration on dynamic model of fine sediment flocculation and settling in still water |
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| DOI： |
| 中文关键词: NaCl 细颗粒泥沙 絮凝 沉降 动力学模式 |
| 英文关键词: NaCl fine sediment flocculation settling dynamic model |
| 基金项目: |
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| 中文摘要: |
| 细颗粒泥沙的絮凝沉降对泥沙输移、土壤渗透性以及污染物迁移有重要作用. 在泥沙初始浓度为5g/L、10g/L、20g/L时, 作者用吸管法研究了不同浓度NaCl对细颗粒泥沙静水絮凝沉降的影响, 认为细颗粒泥沙相对浓度随时间的变化符合双曲线型动力学模式, 泥沙絮凝沉降越快, 研究发现泥沙中值沉速(中值粒径)随泥沙初始浓度和NaCl浓度的增大而增大, 但泥沙初始浓度和NaCl浓度较高时渐超缓慢; 细颗粒泥沙絮凝度与分散粒径呈幂函数关系, 细颗粒泥沙絮凝临界粒径为0.0245mm. |
| 英文摘要: |
| The effect of NaClconcentration on flocculation and settling of fine sediment in still water is studied experimentally in a cylinder, 40cm high and 6cm in diameter. The sediment suspension is sampled from the depth of 20cm with a 20ml pipette. The result shows that the variation of relative sediment concenration is in a hyperbolic dynamic mode related to the time history. It also found that the median velocity increases with the increase of original sediment concentration and NaClconcentration, and a power function relationship exists between the flocculation intensity and dispersing diameter. The critical flocculation diameter of fine sediment is 0.0245mm. |
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