The Hydrological Information Collection Nodes Based On Wireless Sensor Network In Urban Flood Control

The hydrological information monitoring system is one of the most important parts in municipal infrastructures. Since urban waterlogging disasters occurred frequently, the issue of hydrological information collection methods and technology are becoming more and more serious. Traditional manual collection of datas can’t keep up with the need for high-speed development of the city any more. The accuracy and reliability of field instrument data can’t be guaranteed in terms of data collection. Otherwise, artificial or telephone has been far away from satisfying the needs of modern urban flood control because of its shortage for accuracy, reliability and timeliness in data transmission.A new design which is about front-end data acquisition based on wireless sensor network in urban flood control has been come up with in this dissertation in order to solve the acquisition and transmission problems. A certain range of the front-end sensors are connected together to form a self-organized and self-healed wireless network by the wireless sensor network. Through this network can not only maintain the transmission of a variety of sensors gathering information, but also can obtain their running status, the power supply and the network topology information. This information collection system is consisted of a master node and acquisition nodes. Those two kinds of nodes are connected by Zigbee wireless transmission network. The hydrological data collected by acquisition nodes is sent to master node through Zigbee wireless module. Each wireless sensor network has a gateway node which is connected with the data collection communication server of the monitoring center through GPRS link and the gateway node establishes a new channel of data and command transmission. The rainfall regime including water level, rainfall, air temperature and humidity as well as the wireless sensor network information involving the equipment battery is mainly acquired in the system. The GPRS wireless data terminal is used as the data connection part. It will be the collected data and data center for real-time interaction and update. The DTU can ensure the steady reliable data transmission under the unstable environment. Not only the communication protocol of the system but also the circuit design and improvement of functional module hardware has been made in the dissertation. At last the results for node workflows programming and tests has been given.The test results shows that the hydrological information system can not only achieve automatic data acquisition and real-time transmission, eliminating the trouble of manual data reading and laying, but also reduce system power consumption and extend the node time effectively through low-power technology. At the end of the dissertation concludes with a direction to optimize the system.