【摘要】 据扩散理论提出运用分粒级的泥沙垂线分布推算各粒级相对沉速ω_ｉ／ω_ｃ，絮凝因素比Ｆ_ｉ／Ｆ_ｅ和絮凝指标ｆ的方法，由此分析长江口１９９０年８月的实测数据。长江口泥沙的沉速曲线和絮凝指标在近口段、河口段和口外海滨段存在着明显的区域差异。絮凝沉降特征的主要变化产生的低盐度区。现场动态沉降规律与实验室模拟所得的静态沉降规律具有相似的变化趋势。更多还原

【Abstract】 The suspended load equations for every faction of particle size have been used to obtain the relative settling velocity ωi/ωc, relative flocculent coeffecient Fi/Fc and the flocculent exponent f.Measurements of them from the Changjiang Estuary suggest that the features of settling curvers and flocculent exponents are different for the stations situated at its sectons of the river,the estuary and the offshore area. Effective settling velocity for the suspended sediment is increased rapidly when the flocs are developing in the area where fresh water is mixed with sea water. The behaviour of flocs reflected by in situ estimation performs a similar feature as what obtained from still water experiment.更多还原