Study On Flood Control And Damage Reduction System Of Jilin Province Based On GIS

The 21st century is the information age, information resources are important strategic resources, the Ministry of Water Resources to "use information technology to promote water conservancy modernization" of the strategic policy. Spatial information in the information accounted for 80 percent, and in the water industry, this proportion to the total higher. GIS is like a multi-purpose reservoirs, the information on to play, the role of regulation and purification, which includes a variety of sources of information, and such information by geographical coordinates of space for data management, search and retrieval, through the study of space Analysis and other scientific means of processing, and provide multi-level and multi-purpose information services.China's frequent floods, with the rapid socio-economic development, floods caused by the loss of more and more, has become a constraining China's social and economic sustainable development one of the factors. In the framework of the State Flood Control and system design, which many basins or provinces, cities in the development and construction of flood prevention and disaster reduction decision support systems, such as Shanghai, Beijing, flood control and disaster relief work around the actual needs of their characteristics, but all to GIS As a platform. GIS systems in flood prevention and disaster reduction in the main role are: 1. Spatial data management, including the query, retrieval, updating and maintaining 2. Analysis of the use of space for flood control decision-making capacity to provide auxiliary support 3. Application model for all types of data. 4. Optimize the model parameters 5. Forecast projections 6. Flood of information and decision-making program of visual expression. The city flood control, urban socio-economic status because of the uniqueness, and in localities where conditions permit, a city along the river are established, the flood control work is particularly important. Although the city dike construction standards than the local high, but because of impervious area, the production flow, in addition to local fell from the floods, the water could not because of heavy rain caused water logging and discharged more urban form is the main reason for the disaster 1. Also because of city blocks complex, decentralized mixed socio-economic factors, it's difficult to assess the disaster than in rural areas, and flood simulation to be flooded this part of the regional terrain data accuracy and scale of the high demand for more.In this paper, according to the characteristics of the climate and environment in Jilin Province, Jilin Province, flood control and disaster reduction at this stage with the means and facilities, Jilin Province, discovered the flood control reservoirs in the practice of the existing problems, mainly in flood control reservoir on the run backward means of flood control, reservoirs Low flood forecasting accuracy.Reservoir flood control - was largely artificial, manual calculation methods. The rainfall in the upper reaches of the reservoir and the water stations, rain intelligence data to rely on the postal service in the wired communications network transmission, a long time, in the event of inclement weather. Wired telephone interrupted, and often part of the site can not be reported to rain, hydrological information. Forecast operating manual slow, low accuracy, comparable programs reservoir operation less risky, human factors, scheduling personnel responsibilities, leadership and other decision-making difficult problems.Therefore, the objective must be to the practical requirements of flood control means of warning. To address the above issues so as to the author, made through the GIS technology and the effective integration of flood prevention and disaster reduction and the use of GIS spatial analysis, 3-D display analysis, and the massive data management capabilities, to a certain extent, solve the problems encountered by the above.The flood of scheduling and decision-making is actually a very complicated process, the system mainly from two aspects to consider: 1, leading to provide real-time regimen, the situation of graphics and related information. 2, according to the inundation of the flood inundated a simulated demonstration, and the flood damage assessment. The reservoir control of the river's flood control decision-making problems, first of all based on the upper reaches of the reservoir when the river hydrological data for forecasting or water Gong Reservoir flood forecasting, flood forecasting and under, reservoir operation principles of the reservoir for flood, the combination regimen and , The intelligence, disaster, socio-economic aspects of the situation to determine the reservoir discharged flow, then the basis for calculation of flood water from the reservoir dam and reservoir on the upper reaches of assessing the impact, according to the final reservoir discharged flow projections and Interval flow downstream river water Line on the map in the river forecast of dangerous situations, develop emergency rescue measures to determine the scale of projects, engineering estimates.ArcGIS system is mainly in the development platform, the use of ArcObjects, combined. Net systems development to our province Xinlicheng Reservoir as an example, the construction of the Jilin Provincial Flood Control and Information System for Disaster Reduction, and focuses on a general framework, data organization and management, Operating system environment and the achievement of key technologies. Implementation of the flood of information management, flooded simulation, floods economic damage assessment, flood information network and the release of several commonly used GIS system function. The overall framework for the system design, the paper from the perspective of software engineering, process-based GIS systems, system integration targets, select a component technology-based technology system. For our province reservoir characteristics of the data, analysis system structure and system for the client layer, and data services layer. System database into the database by the meta-database, the basis of geospatial databases, special databases and application model database four categories.In the data organization and management, this paper, Jilin Province, the river classification data encoding the shortcomings of confusion, use or reference to a number of relevant domestic and international standards and norms. In keeping with the national unified standard, while retaining a certain degree of flexibility in coding, the data using a unified coding design, and discussed the spatial data and attribute data classification and coding database link technology.In short, this flood prevention and disaster mitigation system in the overall framework and the key technology to make both a useful attempt, which will promote closer geographic information systems in flood control theory and technical aspects of the development.