排海工程等截面扩散器防淤改进措施研究

排海工程等截面扩散器在排放未经处理的污水时，会形成沿程递增的淤床，污水排放量较小时，淤床高度会影响上升管的正常出流。结合嘉兴市排海工程，通过河工模型试验，对减少扩散器泥沙淤积的措施进行了研究。认为，扩散器尾部改进型式能起到一定的降低尾部淤床高度的作用，能够改善上升管出流条件：定期冲洗有助于防止泥沙严重淤积；扩散器上升管喷口数分布不等明显降低尾部淤床高度，改善尾部上升管出流条件。

Study on Improvement Measures to Reduce Sediment Deposition in the Invariable Cross-Section Diffuser of Sea Outfall

Sediment bed with increased height along the invariable cross_section diffuser of sea outfall will be formed when the outfall is used to discharge the untreated sewage, which will influence the normal running of the outfall at lower outflow discharge. Related to the sea outfall project of Jiaxing City, the studies on the measures to reduce the sediment deposition in the diffuser are carried out through hydraulic model tests. It is suggested that the improved seawards ends have certain effect on reducing the sediment bed height in the ends and improving the effluent condition of the risers at the ends; flushing regularly contributes to prevent severe sediment deposition; and the ports numbers of risers increasing along the diffuser can lower the sediment bed obviously so as to improve the effluent of the risers at the ends.