【摘要】 由于地质、结构等原因 ,嘉兴市污水处理工程排放口拟采用等截面扩散器。结合该工程 ,运用模型相似、泥沙运动等理论 ,对排放口等截面扩散器内泥沙淤积问题进行了浑水模型试验。在一定的排放量下 ,泥沙冲淤平衡时 ,扩散器内会形成高度沿程递增的泥沙淤积。对本工程 ,排放量小于 30万t/d时 ,泥沙淤积对上升管出流有影响 ;排放量为 45万t/d时 ,泥沙淤积对上升管出流无明显影响。建议对工程提出减少淤积的改进措施。更多还原

【Abstract】 The invariable cross section diffuser is to be adopted in the sea outfall of Jiaxing marine disposal project, because of the facts of geology and structure. Sediment laden model studies have been taken on the sediment deposition in the invariable cross section diffuser of the outfall related to the project using the theories of the model similarity and sediment movement. When the diffuser is in the equilibrium condition of wash deposition of sediment in certain discharge, the sediment bed with the height increased from the shore to the seaward end in the diffuser would be formed. To this specific project, the sediment bed will influence the risers’ discharge when the total discharge flow was below 300 000 t/d, whereas, it will not influence the risers’ discharge significantly when the total discharge flow is 450 000 t/d. It is suggested that the improvement measures to reduce the sediment deposit for the diffuser should be put forward.更多还原