摘要
以西安市污水管网为研究对象,运用声呐探测与管道机器人相结合的方法,调研了城市污水管网沉积物的沉积与冲刷情况以及各级污水管网中沉积物的形成规律。结果表明,西安市城区80%的污水管道存在沉积现象,其中合流制管道较分流制管道更易于沉积。不同级别的管道沉积规律不同,平均沉积量呈现出"排水支管>干管>主干管"的分布规律;支管和干管的沉积量为主干管的2～3倍,支管沉积量分布较为分散,容易出现淤积堵塞情况,而主干管沉积量一般不超过10%,过流情况较好。沉积作用和冲刷作用是影响沉积物形成的主要因素,流速的变化影响管道污水中悬浮物的沉积与再悬浮,这一情况对于流速波动较大的排水支管和干管中沉积量的影响最为显著,而排水主干管则因流速相对稳定而沉积量变化较小。研究还发现,由于管道流态变化原因,排水管道汇流后比汇流前、拐弯后比拐弯前更容易发生沉积。
Taking sewer network in Xi＇ an as the research object, deposition and erosion of the sediment and its formation mechanism in different level sewer networks were investigated by adopting the combined method of sonar detection and pipeline robot. The results showed that deposition phenomenon existed in 80% of the sewers in Xi＇ an City, and the combined system was easier to deposit than the sep- arate system. Deposition of different level sewers had different sedimentary mechanism, and the average deposition amount presented the distribution of branch sewer 〉 sub-main sewer 〉 main sewer. The thick- ness of sediments in branch and sub-main sewers were 2 -3 times higher than that of the main sewers, and the distribution of sedimentary amount of branch sewer was more disperse, which was easy to block. However, deposition amount of the main sewer was generally no more than 10% , where good flow condi- tion was obtained. It was found that deposition and erosion were the main factors influencing the formation of sediment. Variation of flow velocity affected the deposition and resuspension of sewage suspended solid in the sewer, and the situation had the most significant influence on the deposition in branch sewer and sub-main sewer with high velocity fluctuation. However, the main sewer had less variation of depositiondue to relatively stable flow velocity. In addition, because of variation of the how state, deposition was more likely to occur after the confluence and turning than before the confluence and turning of the sewer.
作者
付博文
金鹏康
石山
常海东
李雪兵
贾锐珂
FU Bo-wen;JIN Peng-kang;SHI Shan;CHANG Hai-dong;LI Xue-bing;JIA Rui-ke(School of Environmental and Municipal Engineering,Xi＇an University of Architecture and Technology,Xi＇an 710055,China)
出处
《中国给水排水》
CAS
CSCD
北大核心
2018年第17期119-122,127,共5页
China Water & Wastewater
基金
国家水体污染控制与治理科技重大专项(2012ZX07313001)
新世纪优秀人才支撑计划项目(NCET-12-1043)
陕西省创新团队项目(IRT-2013KCT-13)
关键词
城市污水管网
沉积物
冲刷
沉积区域
urban sewer network
sediment
erosion
sedimentary area
