Development Of Flood-monitoring System In The Middle Reaches Of Yangtse River

Flood is the most serious disaster in the middle reaches of the Yangtse River. Based on the RS technology, GIS technology and the most advanced technology of designing software, we finished the powerful "monitoring-flood system in middle reaches of the Yangtse River". Hope that by building this system, high-tech measure can be used for providing decision-making for the government departments in middle reaches of the Yangtse River in finding out the situation of flood, designating the resisting-flood scheme and rebuilding after flood disaster.This paper introduced basic theories of building the system, processes of designing and finishing the system, methods of applying the system. Included:(1) Basic theories of building the system: basic theories of remote sensing application, basic theories of GIS application, basic theories of computer application.(2) Processes of designing and finishing the system: principles and methods of building the system, the structure and function of the built system.(3) Methods of applying the system. By inputting the remote sensing materials, we monitored the flood disaster in the reaches of the Yangtse River in 1998.Compare the monitoring results with the data in the department of flood prevention, using Radar to monitor the flood, precision: 90%~95%, needs 10~20h;using NOAA to monitor the flood, precision: 85%, needs 2~3h.What the above have analyzed shows that using this system to monitor the flood disaster of Wuhan City and some areas around it, the measure is feasible and the monitoring results are credible. Of course, this system need perfect more in some aspects in future.