Rainstorm Flood Warning System Of Zhengzhou Urban Based On WebGIS

The acceleration of the urbanization process has led to the intensification of the urban heat island effect and the great changes in the conditions of the urban surface,On the one hand,it induces and strengthens the city’s heavy rain,On the other hand,due to the decrease of the permeable ground in the city,the production flow increases,leading to the increasing waterlogging problem in the city and threatening the urban development and people’s life.The use of reasonable hydrological model and modern advanced WebGIS technology to achieve real-time warning of urban flood waterlogging has great significance for preventing urban floods and development of urban economy.This paper can realtime calculate the waterlogging information of Zhengzhou urban,using strom water management model and measured rainfall data of rainfall station.And this paper uses JavaWeb technology to research and develop a system based on B/S architecture.The system calls the dynamic link library of the storm water management model,and realizes the real-time warning of urban flood waterlogging based on WebGIS technology.The main research contents are as follows:(1)Calculation of waterlogging in zhengzhou city based on SWMM.Based on the pipe network and underlying surface data in zhengzhou,this paper makes the generalization of the pipe network,the division of subareas and extraction of attribute,and reads the measured rainfall data from rainwater telemetry database of henan province.Then the SWMM is used to calculate the flooding water information in Zhengzhou city,and packaged for system calling.(2)Design of rainstorm and waterlogging database in Zhengzhou urban area.Using database technology,in accordance with the three-paradigm principle and the internal logical relation of storm water management model,the database of Rainstorm and waterlogging in Zhengzhou urban area is designed,it’s redundancy is small and the structure is reasonable.And the relational database is constructed by MySQL 5.6 to store the rainstrom and waterlogging data.Using the database access technology,the system programming language can access the database by JDBC data access components to achieve the data addition and deletion and other functions.(3)Realization of realtime warning function of storm flood in Zhengzhou urban area based on WebGIS.The B/S system is built by MVC,WebGIS and JavaWeb technology.The system uses the SWMM.DLL and the rainfall data of the datdabase to realize the real-time calculation of the flooding and waterlogging data in Zhengzhou urban area.The map service is released by ArcGIS Server.The ArcGIS Server API for JavaScript is used to achieve the map service access and the waterlogging real-time warning functions.