Importance Analysis of Disaster Risk Indicators for Storm Flooding in New and Old Urban Areas of Zhengzhou City
January 1, 2023 - Zhang, J.-P.; Chen, W.; Fang, H.-Y.; Zhang, H.-R.
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EmailJournal or Book Title: Water Resources and Power
DOI:10.20040/j.cnki.1000-7709.2023.20221217
Abstract: The Gaoxin District and Jinshui District were selected as the representatives of the new and old urban areas of Zhengzhou to explore the evaluation indexes that affect the risk of rainstorm waterlogging in cities and the importance of each index, and a risk index evaluation system covering natural and social factors was established. The importance of each evaluation index in new and old urban areas was determined by using random forest model. The results show that for both new and old urban areas, the sensitivity of disaster-inducing environment is the most important first-level indicator. Among them, imperviousness and pipe density are the most important tertiary indicators for surface and subsurface disaster-preventing environments, respectively. The risk of disaster-causing factors is the least important for Jinshui District and Gaoxin District, and the importance of rainfall is much greater than that of rain type. The difference between the old and new urban areas is mainly reflected in the stability of disaster-bearing body, whose importance is 0.23 and 0.09 for Jinshui District and Gaoxin District. The conclusion can provide some reference for the prevention and control of rainstorm waterlogging disaster in Zhengzhou.
Type of Publication: Journal Paper
