城市供水管网模型校核参数的研究

发布时间：2018-01-04 15:37

本文关键词：城市供水管网模型校核参数的研究　出处：《华南理工大学》2014年硕士论文　论文类型：学位论文

【摘要】：为了更好地全面地了解供水管网的实际运行状况，建立与实际供水管网系统特征相符的管网模型是实现管网的科学管理、优化设计、优化运行调度、优化改扩建、漏损控制及水质分析的基础，也是诊断管网异常情况、提高管网运行管理水平和服务水平的保证。在水力模型建立过程中，模型校核是供水管网水力建模的最为重要一环。但是，在供水管网建立的初期，水力模型的模拟结果与实际值的差异较大，究其原因，是由于模型建立前期，各种参数和输入数据存在一定的误差。因此要建立较为准确的供水管网水力模型，必须对模型进行校核，并达到一定的校验标准，使建立的水力模型能较真实的反应供水管网的水力特性。目前的校核工作中，将主要的重点放在节点流量与管段粗糙系数的调整上。对于管段直径的不确定性影响较少有研究。供水管道由于运行年限的增加，管道腐蚀结垢，有效过水面积减小，即有效的直径会降低。通过水力损失公式的推理和基于随机抽样技术对节点流量、管段直径与管段粗糙系数进行定量分析发现，直径的不确定性对于管网的状态也有显著的影响。需要在模型校核当中予以考虑。目前节点流量的估计已经趋于完善，模型中主要的两类未知参数为管段直径与管段粗糙系数。由于引入了直径作为校核参数后，，校核问题的复杂程度增加了。为此以一个基准管网为基础，设计了三个不同的校核方案对这两类参数进行校核。结果发现，忽略直径的影响，会降低模型的精度，导致模型无法达到校核的精度。而考虑了直径因素后，模型的精度有所提高，可以达到校核的要求。而在校核过程当中，同时校核管段直径与粗糙系数的方式与先校核直径后校核粗糙系数的方式结果相近，都可以作为两类参数校核的一个参考。
[Abstract]:In order to better understand the actual operation situation of the water supply network and establish network model consistent characteristics of actual water supply system is to achieve the optimal design of scientific management, network optimization, operation optimization, expansion, analysis of leakage control and water quality, also is the diagnosis of network anomalies, improve operation management and service the level of assurance.
In the process of setting up a hydraulic model, model checking is the water supply pipe network hydraulic model is the most important part. However, in the early establishment of water supply network, different simulation results of hydraulic model and the actual value is larger, the reason is because the model is built early, some errors of various parameters and therefore to input data. The establishment of water supply network hydraulic model is more accurate, must check on the model, and achieve the verification criteria, the hydraulic characteristics of hydraulic model of water supply network can respond more realistic.
Check the work at present, mainly focus on the node flow and pipe roughness coefficient adjustment. There are researches on effects of pipe diameter uncertainty less. Due to the increase of water supply pipeline operation period, pipeline corrosion and scaling, effective water area is reduced, which will reduce the effective diameter. The hydraulic loss based on the formula of reasoning and random sampling technique of node flow, quantitative analysis found that the pipe diameter and pipe roughness coefficient, the diameter of the uncertainty also has a significant impact on network state. Need to be considered in model checking.
The estimation of node flow has been perfected, the unknown parameters are two main types of models for pipe diameter and pipe roughness coefficient. Due to the introduction of the diameter as checking parameters, the complexity of checking problems increased. Using a benchmark network as the foundation, we design three different verification program to check the two kinds of parameters. The results showed that ignoring the effects of the diameter of, will reduce the accuracy of the model, to check the accuracy of model can not achieve. The diameter of factors, the accuracy of the model is improved, can achieve the verification requirements. In the verification process, at the same time the diameter and the roughness coefficient of pipe mode and first check check the diameter after checking the roughness results are similar, can be used as a reference to two kinds of parameter calibration.

【学位授予单位】：华南理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU991.33

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