An Gis-Base Mountain Flood Forecasting and Early Warning System in China (PAP014357)
Liang Guo, Hong Wang, Liuqian Ding
Flood forecasting and early warning systems
China has the most interesting topography with vast mountain ranges that occupied two-thirds of the nation's land. Consequently, mountain floods have been one of the most deadly natural disasters and are taking an increasing roll in claiming lives and causing severe damages each year. In recent years, China has directed its attention to mountain floods and shifted its policy from flood control to flood management with an emphasizing on forecasting and early warning. But the development of a nationwide mountain flood forecasting and early warning system is still under construction and in the pilot stage? This research, utilizing GIS technique, presents the design principles, composition and the module functionality of an automated mountain flood forecasting and warning system based on the advanced distributed hydrologic and hydraulic modeling processes. The methodologies include zoning of sub-basins using DEM data and character abstraction; Unit Hydrograph analysis for ungaged small watershed; database design and construction; software architecture, design, and implementation; and the integration of the flood forecasting, warning and conducting emergency response. Taking a central Province, Henan, as an example, the proposed system is calibrated and validated. The results show that the proposed system will provide constructive information and assist policy makers in a scientific and timely manner in their decision-making process to reduce the casualty and property damage caused by mountain floods.