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Journal of Desert Research ›› 2022, Vol. 42 ›› Issue (6): 25-32.DOI: 10.7522/j.issn.1000-694X.2022.00038

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Pre-assessment and verification of rainstorm and flood disasters risk based on FloodArea model

Na Wang1,2(), Tianwang Lei3(), Shun Xiao4, Yangna Lei1,2, Mingce Mao1,2   

  1. 1.Shaanxi Key Laboratory of Eco-Environment and Meteorology for the Qinling Mountains and Loess Plateau,Shaanxi Meteorological Bureau,Xi'an 710014,China
    2.Shaanxi Climate Center,Xi'an 710015,China
    3.Xi'an Traffic Engineering Institute,Xi'an 710065,China
    4.School of Geography and Tourism,Shaanxi Normal University,Xi'an 710119,China
  • Received:2022-02-12 Revised:2022-04-14 Online:2022-11-20 Published:2023-01-09
  • Contact: Tianwang Lei

Abstract:

By using hourly rainfall data from the meteorological stations, grid forecast precipitation data, the digital elevation model, the land use data,and the disasters data, a pre-assessment method for rainstorm and flood impact is established over Shaanxi Province. Based on the inundation depth and scope, a refined rainstorm flood disaster risk pre-assessment model was established with overlaying the attributes of the disaster-bearing body and introducing the disaster loss curve of the disaster-bearing body, then verified from the perspectives of the proportion of the quantity and the proportion of the disaster. The results show that the prediction disaster areas of rainstorm and flood meteorological risk are basically consistent with the actual distribution of disaster areas, and the correct prediction rate is 73.2%, and the simulation results are highly reliable. The risk pre-assessment performance of concentrated rainstorm in precipitation area is higher than that of decentralized rainstorm, and the missing rate is relatively low, but the empty rate is high.According to the results of risk pre-assessment and effect inspection, it is found that the regional adaptability of the model itself and the accuracy of rainstrom forecast affect the accuracy of pre-assessment. The procedure of rainstorm and flood disaster risk pre-assessment and effect inspection can improve the pertinence of meteorological services, which can be used in the actual business of flood risk pre-assessment and provide technical support for storm and flood risk management.

Key words: rainstorm and flood, FloodArea model, risk pre-assessment, verification

CLC Number: