Study On Flood Monitoring In Medium And Small Basins Of Guangxi Based On GIS

Guangxi belongs to subtropical monsoon climate area, time and spacedistribution of rainfall is extremely uneven. In recent years,Guangxi’smeteorological disasters has been in multiple, frequent situation, and hazardrate has risen. Flood is one of the main meteorological disasters in Guangxi,and each time the flood disaster involved of the county, the affected area,direct economic loss serious, changing society of by the enormous influence.The flood disaster in Guangxi, can use GIS technology, combined withmeteorological observation site material and topography characteristic offlood disaster pilosity area, realize the flood monitoring, forecasting, warning,so that to take effective measures, and do our best to reduce the damage ofthe flood disaster.This paper combining previous research to the geographic informationsystem (GIS) technology for support, and carry out small river basin inGuangxi of flood monitoring research. The small and medium-sized basinmainly in Guangxi of digital information extraction, comparative analysis toselect the most optimal interpolation method, analyzes the main river basinsin Guangxi heavy rain, and flood space-time characteristics and flood disastermain influencing factors, and AHP, sure to rainfall, elevation, slope, rivernetwork density and land use five kinds of index level index system, buildingbased on GIS technology flooding comprehensive index calculationmodel.Through the selection in Lijiang River basin nearly10years typicalrainfall, heavy rain, for the establishment of the model is validated analysis,model calculated flood disaster distribution area, basic is consistent with thereality, can achieve with real-time rainfall, or future24hours,48hours ofrainfall forecast for flood monitoring, forecast and auxiliary flooddecision-making.