Flood Disaster Risk Zoning in Maiji District of Tianshui City Based on GIS
Based on the general survey data of meteorological disaster risk in Maiji District,combined with precipitation records and meteorological disaster data,geographical spatial data,and socio-economic data,the four factors including the risk of rainstorm disaster causing factors,the sensitivity of disaster pregnant environment,the vulnerability of disaster bearing bodies,and the ability of disaster prevention and reduction,were selected to carry out the research on flood disaster risk zoning in Maiji District.The research showed that from 1965 to 2020,rainwater activity in Maiji District was mainly concentrated from June to August,with an annual precipitation of 500.2 mm.The precipitation period was concentrated and intense.Statistics showed that mountain torrents in Maiji District were mainly caused by rainstorm and heavy thunderstorm. When the precipitation exceeded 20 mm or the general precipitation exceeded 30 mm within 8 hours,serious floods may occur in Maiji District. The regional distribution of rainfall influencing factors for flood disasters in Maiji District was very regular,increasing from northwest to southeast. The terrain impact factors of flood disasters showed that the sensitivity of flood disasters was highest in the northern border area,followed by the central and southern river valleys,lower in the western region,and lowest in the central and eastern forest areas. The high and sub-high risk areas of flood disasters in Maiji District were mainly concentrated in the main rivers along the northern border and the main agricultural and forestry production areas in the central region. The medium,sub-low,and low risk areas were main-ly concentrated in the high-altitude areas in the north and the forest areas in the southeast. This paper proposed to increase the construction of flood control projects,improve the quality of hydraulic infrastruc-ture,and comprehensively and meticulously investigate disaster risks and hidden dangers in disaster pre-vention and reduction measures.
flood disastersrisk zoningrisksensitivityvulnerabilitydisaster prevention and reduc-tion capabilitiesMaiji District of Tianshui City
NETL
NSTL
万方数据
