Study On The Optimization Of Drainage Pipe Network And The Variation Characteristics Of Wastewater Quanlity

Water resources are very lacking in China. Combing with the water consumptionincreasingly year by year in recent years and contradiction between supply and demand ofwater resources obviously day by day, the lack of water resources has seriously restrictedthe economic development.China’s per capita water resources in only2200m3, far behindthe world medial occupancy of water resources; At the same time, the deterioration of urbanwater environment makes the water pollution is quite serious, that also further exacerbatesthe shortage of water resources. To relieve the problem, it is important to effectively controland manage urban drainage pipe network system. With the rapid development of computertechnology, the drainage pipe network model is apply as an auxiliary tool, which not onlycan improve the performance of the existing pipe, but also can evaluate the safety of pipenetwork construction. It has the very good effect to improve the efficiency of networkoperation and management.It has systematically established the drainage network InfoworksCS hydraulic modeland water quality model, with JZ old city sewer network system as the research backgroundand powerful InfoworksCS software as technical method. It provides theoretical andtechnical support for actual pipe network project in the city.It mainly expounds speculative knowledge of the combined sewer system model andvarious calculation module of InfoworksCS model. Simultaneously, it also details the basicmethod steps of network modeling, including collecting and importing figures, building thetopological construction of network, checking the model, dividing the sub catchment area,setting the basic parameters, etc. As with the actual rainfall data, it has calibrated andsensitively analyzed the parameters of rainfall runoff model. Through that, it hasdetermined the composition of rainfall runoff model which is suitable for this area.Moreover, the most sensitive parameter is the steady infiltration rate of model which hasinfluenced the regional flood peak and runoff volume, and the minimal impact parameter isthe initial loss value and initial infiltration rate of mode. With the calibrated model, it has analyzed the causes of the problem existing in thestatus network.Moreover, it is put forward that the optimization reconstruction scheme ismore scientific and reasonable. Using the InforworksCS model, it has simulated the alteringengineering solution. Appraised results shows that the reconstruction schemes significantlyalleviate the operation load of pipeline and reduce the risk of flooding overflow, Thus, itcan be used to guide for the optimization modification of the urban drainage pipe networksystem and the decision-making support of the practical projects.By establishing the key position of the pipeline water quality model in the urbannetwork and combing with the field measures data, it analyzes the variable characteristicsof the wastewater quality, that there are significant changes in water quality during rainfalland non-rainfall period. It can be reflected in the dramatically fall of the various pollutionconcentration. In the non-rainfall period the main factor is the discharge regularity ofdomestic sewage that affects the water quality, parts of industrial waste water; in the rainfallperiod the major elements include the pollutant accumulation in the catchment area, rainfallintensity and rainfall duration, etc. The results indicate that it is important to the control ofvarious regulation and critical factors of water quality in the key position, which canprovide evidence of the optimization of the urban pipe network management.Not only can the paper research provide the basis for the optimization reconstructionwork of JZ city drainage pipe network, but also it may provide reference for themanagement and program of the drainage pipe network operation of other cities.