导　　师： 余健

学科专业： 081403

授予学位： 硕士

作　　者： ;

机构地区： 湖南大学

摘　　要： 随着我国社会经济的发展、城市化进程不断的加快，城区面积、人口数量急剧增加，但城市排水管网工程的投资力度远低于城市的发展速度，城市排水管道的淤积堵塞问题日益严重。因此，开展排水管道沉积物的研究，对改善排水系统运行状况是非常有必要的。 本文选择位于G市越秀区的新河浦涌流域为研究对象，通过对研究区域排水管道进行沉积现状调查及取样分析，了解现状管网沉积状况与各影响因素的相关性，分析不同时期、不同区域沉积物的粒径分布以及沉积物中可降解有机质、氮、磷的污染水平。研究发现：研究区域内一半的排水管道都存在不同程度的沉积现象，沉积物主要由粒径小于250μm的细砂颗粒组成；管道沉积量与管径成正相关，钢筋混凝土管道比PVC管道沉积现象严重，不同汇水区域中，老式小区、商业区管道沉积现象最严重，分流制雨水管道比合流制系统沉积更甚；不同城市功能区、不同时期沉积物颗粒的粒径分布不均匀，粒径在250μm以下及450~900μm范围内的沉积物颗粒富集了沉积物中的60/%~80/%的污染物。 以InfoWorks CS模型为工具，通过查询国内外相关文献确定模型的计算参数，利用相关部门提供的基础管网GIS数据、实测流量数据，以及现场调查取得的水质、沉积物厚度数据，对研究区域进行子集水区划分、模型初始设置，选择用类似于水流携沙力理论来描述沉积物颗粒沉积、冲蚀的Ackers-White Model水质模块，建立了基于InfoWorks CS的排水管道沉积规律研究模型，并利用在线监测数据及沉积实测数据率定模型。 利用率定后的模型进行研究区域排水管道沉积状况的预测性模拟，对坡度、管道材质、管道横截面形状、汇水区域性质、降雨强度等因素进行影响管道沉积的敏感性分析，探讨不同工况下沉积物的 With the development of our social economy and urbanization acceleratingcontinually, urban area and population increasing sharply, but city drainage pipelinesproject investment is far lower than the speed of the city development, the citydrainage pipes deposition congestion problems getting more and more serious. So, inorder to improve the operation of the drainage systems, it is necessary to carry outthe research on sediment deposition in drainage pipes. In the paper, we chose study object which located in Yuexiu district newhepuchong river basin of G city, through the investigation and sampling analysis ofthe research area’s drainage deposition, we know the correlation of all factors thatpipe network sedimentary status and the present situation, pipe diameter, slope, pipematerials, catchment area properties, drainage system, etc. We can know differentperiod, different area of sediment particle size distribution and sedimentbiodegradable organic matter, nitrogen, phosphorus pollution levels. Results showsthat, at least half of the area’s pipes have deposited to different extent, and themajority of the sediment are fine sand particles whose diameter are below250μm;Slope has the greatest impact on the pipeline deposition, and that pipeline depositionraises with the increasing of diameter. Meanwhile, deposition in concrete pipes ismore serious than that in PVC pipes. The property of subcatchment affects thedeposition at the same time. The pipes in the old residential district and businesszone that have the most serious deposition. In addition, the deposition of stormsewers is even more serious than that of the combined system. The distribution ofparticles are uneven in different zones and periods; the sediment particles of whichthe diameter are below250μm or within450~900μm enriched60/%~80/%ofpollutants. Use InfoWorks CS model as the tool, through inquiring the related literature athome and abroad, we determined the parameters of model calculation. Using thefoundation of pipeline GIS data, data flow

关 键 词： 排水管道 沉积物 模型 敏感性分析 控制沉积

领　　域： [建筑科学]