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城市给水管网系统是一个结构复杂、规模庞大、随机性强、运行控制为多目标的网络系统。因此，实现给水管网系统的科学管理，对给水管网的流量进行分析计算，用计算机技术计算管网内流量的实际情况，是给水事业发展的必然需要。
The municipal water supply system is a complex network with the features of high degree of randomness and multi-object operation. Therefore, a scientific management approach with which the tap water flow is monitored by a computer-based control system turns out to be essential to a modern water supply network.
本文将复杂管网的支撑技术――GIS引入到管网流量的计算中来，通过GIS方便的绘图功能、分析功能、对三维信息显示功能以及数据导出导入功能，将城市地下管网模型数据在GIS中建立起来，然后通过建模软件的数据导出功能，将地下管网的坐标信息和拓扑关系信息导出到中间文件中，然后利用本课题的流量分析软件将中间文件的信息导入到流量计算系统数据库中，根据数据库中的信息，对指定的地下管网进行流量分析和计算。本文在研究了现有关联矩阵算法后，提出了使用贪心算法进行复杂给水管网流量计算的观点.使用贪心算法进行流量计算，不但避免了关联矩阵算法中复杂的矩阵运算，减少了运算量，提高了运算速度，而且解决了一些关联矩阵算法解决不了的问题，例如正向流量计算，屏蔽某些节点的流量计算，在虚拟条件下的流量计算等等。
In this paper, the author introduces GIS, a prevalent city-planning device to the computation of the tap water flow, models an underground pipe system with the functions of GIC such as plotting, analyzing, 3D display and data I/O, exports the information of coordinates and topological relations to an intermediate file, which is then imported to the database with the flow control software developed for this task in order to analyze and calculate the flow. The author puts forward a new approach to calculating the flow with the greedy algorithm after studying the ready-made algorithms dealing with correlation matrices. Using the greedy algorithm avoids complicated computation of correlation matrices, which significant improves the speed by means of facilitating computation, and solves problems that cannot be done otherwise, such as the computation of positive flow, of shielding the flow of certain nodes, as well as that under virtual circumstances.
论文阐述了给水管网流量分析和计算的基本原理，并选择一个区域内的管网资料进行模型建立，根据建立的模型信息进行流量分析和计算。在此目标下，进行了相关系统的开发，并对开发的系统进行了数据验证。经过此系统的开发，对GIS系统、复杂管网系统，数据库系统、软件开发领域的相关知识有了一个整体的认识。
The paper explicates the basic principles of analysis and computation of tap water flow, and creates a model using a real-life case, according to which to analyze and compute the flow. Under this objective, the author develops a system and tests the relevant data. Out of this series of practice a comprehensive understanding of GIS, complex pipe system, database and software development is acquired.

关键词：给水管网 GIS系统 流量计算 贪心算法
Key word: water supply network, GIS system, computation of flow, greedy algorithm

City supply water pipe network system one structure complicated in large scale , randomness strong operating , controlling for many network system of goal. So realize , supply water pipe network scientific management of system , analyze to flow to supply water the pipe network that calculates, calculate actual conditions of flow in the pipe network by technology with computer, to supply water undertaking development inevitable to need.
This text introduce complicated support technology of pipe network - -GIS , get pipe network come in the calculation of flow, through GIS convenient drawing function, analyze function , reveal to three-dimensional information function and data lead , produce , channel into the function, underground pipe network model data set up , stand up among GIS city, lead , produce function through modeling data of software, lead and appear coordinate information of the underground pipe network and topological relation information in the middle file, then utilize the flow of this subject to analyze the software guides the information of the middle file into computing system database of the flow , according to the information in the database , carry on the flow to analyze and calculate to the designated underground pipe network .
After have investigated the related matrix algorithm, put forward the idea of using greedy algorithm carry on complicated watersupply pipe network view that flow calculate, use the greedy algorithm to carry on the flow to calculate, not only has avoided the complicated matrix operation in the related matrix algorithm, have reduced the operation amount, has improved the operation pace , and has solved the problem that some related matrix algorithms can not be solved , for example calculating to the flow , shield some nodal flow to calculate , calculate etc. in flow under the fictitious condition .
Basic principle of explaining and supplying water and analyzing and calculating in flow of the pipe network in the thesis, choose the pipe network materials in an area to set up models , carry on the flow to analyze and calculate according to the model information set up. Under this goal , have carried on the development of relevant systems , and verify the data to the system developed . Through the development of this system, to GIS system, complicated pipe network system, database system, relevant knowledge of the software development field have a whole understanding.
Keywords: Supply water pipe network ,GIS system, flow calculation, the greedy algorithm

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不再是过去的瘪三了!

The city water pipe net system is a structure complications,scale is huge,the random is strong and circulate a control is many the network system of[with] target.Therefore carry out the science management of the water pipe net system, carry on an analytical calculation to the discharge of the water pipe net, use the actual circumstance of the discharge inside the calculator technique calculation tube net, is the inevitable demand of the water supply business development.
This text takes care of complications the net props up the technique ―― GIS to lead go in to go to tube the net discharge of calculation in, pass convenient painting function of GIS,analyze function,show to the 3D information the function and data lead a ducting function, building up the city underground tube net model data in the GIS, then leading a function through a data of set up the mold software, taking care of underground the net sit the mark information and 拓 to rush toward the relation information to lead to go to in the center in the document, then make use of the discharge of this topic analysis software will in the center the information of the document duct into to the discharge to compute in the system database, according to the information in the database, to appointed of underground tube the net carry on the discharge analysis and calculation.This text put forward using greed calculate way to carry on calculating standpoint of the complicated water pipe net discharge after study the existing connection matrix calculate way, using greed calculate way to carry on the discharge calculation, avoiding the complicated matrix operation in the connection matrix calculate way not only, reducing the operation quantity, raising the operation speed, and resolving some connection matrix calculate ways can't resolve of problem, for example just to discharge calculation, shield the discharge calculation of some nodes, the discharge that is under the virtual condition calculation etc..
It elaborated the water pipe net discharge analytical and calculating basic principle in the thesis, and choose the tube net data in a district to carry on the model establishment, carry on the discharge analysis and calculation according to the model information of the establishment.Carried on the development of the related system under this target, and the system of the folio hair carried on the data verification.Through the development of this system, to the GIS system,complications tube net system, database system,software development realm of the related knowledge had a whole understanding.

To the mains network is a system of urban structure complex, large-scale, random nature of strong, functioning control system for multi-purpose network. Therefore, to achieve the scientific management system pipe network to pipe network flow analysis to calculate, using computer technology and network computing flow conditions, water supply is the inevitable development of the cause of need. This will be complex and technical support network -- GIS into pipe network flow calculation to facilitate the adoption of GIS mapping functions, functional analysis, three-dimensional information on the functions and data that derived embryonic functions to the urban underground pipe network in the GIS data model to build up, and then through software modelling data derived function underground pipe network will coordinate information and information derived to order relations among documents, and then use the software for analysis of the flow of information will lead to Middle document flow calculation system database, according to the database information to a designated underground pipe network flow analysis and calculation. In this study of the existing link matrix algorithms, the proposed use of greedy algorithm to complex pipe network flow calculation perspective, the use of greedy algorithm flow basis, not only to avoid a correlation matrix algorithms, the complex matrix operations, reduced processing capacity and improve the processing speed, and solve some correlation matrix algorithms solve every problem, For example, the flow is calculated shielding certain nodes flow calculation, the calculation of the flow conditions in the virtual, and so on. The thesis expounded to the pipe network flow analysis and calculation of the basic principles of the region and to choose a model for the establishment of information networks, based on a model of information flow analysis and calculation. In this goal, a related system development, system development and data certification. Through the development of that system, GIS system, the complex network of systems, database systems, software development field with an overall understanding of relevant knowledge.

To the mains network is a system of urban structure complex, large-scale, random nature of strong, functioning control system for multi-purpose network. Therefore, to achieve the scientific management system pipe network to pipe network flow analysis to calculate, using computer technology and network computing flow conditions, water supply is the inevitable development of the cause of need. This will be complex and technical support network -- GIS into pipe network flow calculation to facilitate the adoption of GIS mapping functions, functional analysis, three-dimensional information on the functions and data that derived embryonic functions to the urban underground pipe network in the GIS data model to build up, and then through software modelling data derived function underground pipe network will coordinate information and information derived to order relations among documents, and then use the software for analysis of the flow of information will lead to Middle document flow calculation system database, according to the database information to a designated underground pipe network flow analysis and calculation. In this study of the existing link matrix algorithms, the proposed use of greedy algorithm to complex pipe network flow calculation perspective, the use of greedy algorithm flow basis, not only to avoid a correlation matrix algorithms, the complex matrix operations, reduced processing capacity and improve the processing speed, and solve some correlation matrix algorithms solve every problem, For example, the flow is calculated shielding certain nodes flow calculation, the calculation of the flow conditions in the virtual, and so on. The thesis expounded to the pipe network flow analysis and calculation of the basic principles of the region and to choose a model for the establishment of information networks, based on a model of information flow analysis and calculation. In this goal, a related system development, system development and data certification. Through the development of that system, GIS system, the complex network of systems, database systems, software development field with an overall understanding of relevant knowledge.