LUOXiao-ping,JIANGYing-he,CHENGJing,et al.Laboratory-scale Study on Scouring of Sediment in Combined Sewer System[J].China Water & Wastewater,2023,39(11):132-138.
Laboratory-scale Study on Scouring of Sediment in Combined Sewer System
China Water & Wastewater[ISSN:1000-4062/CN:12-1073/TU]
volume:
第39卷
Number:
第11期
Page:
132-138
Column:
Date of publication:
2023-06-01
- Keywords:
- combined sewer system; sediment; scouring; particle size; influence factor
- Abstract:
- To explore the scouring of the sediment in the combined sewer system in rainy days, scouring experiments were carried out by using scouring flow (Q）, the slope of the pipeline （i） and the ratio of sediment thickness to pipe diameter （hy/D） as the main parameters. The single factor experiments showed that under conditions of different factors, the SS concentration in effluent showed an exponential decaying trend with scouring time, and the scouring was mainly occurred in the first 60 seconds. The average SS concentration in effluent increased with the increase of Q, i and hy/D. The SS released by the scouring increased with the increase of Q. The small particles on the surface were scoured preferentially at the initial stage of scouring. Under large Q and i conditions, the peak value of the median particle size appeared earlier, and the variable trend of particle size was not significant. When hy/D was larger, the peak value of the median particle size appeared later, and the variable trend of particle size was slower. The orthogonal experiments showed that the weight of factors affecting SS scouring in descending order was Q, hy/D and i.
Last Update:
2023-06-01