The Ecological Risk Assessment Of Flood And Drought In The Northwest Of Liaoning Province

Along with the economic development,population growth and global warming,such as frequent extreme weather,floods and droughts have further aggravated the trend.The flood threat to people’s life safety,have caused huge property losses,and have profound impact on social and economic development.In northwest area of Liaoning Province belongs to the temperate continental monsoon climate,due to the influence of geographical location,natural climate,land and sea distance and the environmental conditions,making frequency of flood and drought disasters occurred in the northwest area of Liaoning and the magnitude of the high weight,resulting in a very large impact and losses.This thesis chooses in the northwest of Liaoning Province 14 meteorological stations 1949-2014 years of meteorological data,20 soil moisture site data.In drought and flood risk source,three kinds of landscape ecological system for risk receptor,using principal component analysis method and ArcGIS software Kriging interpolation tool for spatial interpolation,constructed in Northwest Liaoning flood and drought disasters in ecological risk assessment model.The standardized data were superimposed,drought occurrence frequency of the drought risk source metric distribution class map.And on the basis of ecological risk assessment of each individual disaster,on flood and drought disasters comprehensive probability distribution,ecological loss,vulnerability of social economy degree analysis,and finally completed the flood and drought disaster in Liaoning Northwest Ecological Risk Assessment and mapping.The main research contents and results are as follows:(1)Based on the individual results of ecological risk assessment,the different frequency risk appeared on various areas of the northwest area of Liaoning(2)Province were analyzed.The results showed that the overall spatial distribution is southwest of ecological risk is lower than in the northeast.(3)High risk area accounted for 58%,more than half of adult.Low risk area accounted for 32%,and only half of the high risk ratio.High and low risk to instructions is almost half of the inundation and drought ecological risk level,a significant level of characteristic.