Proceedings of the International Conference on Industrial Design and Environmental Engineering, IDEE 2023, November 24–26, 2023, Zhengzhou, China

Research Article

Risk Assessment of Geological Disasters Based on Slope Units in Town Scale A case study of Dazhou Town along the Yangtze River

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  • @INPROCEEDINGS{10.4108/eai.24-11-2023.2343450,
        author={Jie  Fu and Xiuyuan  Yang and Aihong  Shi and Qing  Zhang and Songlin  Liu},
        title={Risk Assessment of Geological Disasters Based on  Slope Units in Town Scale  A case study of Dazhou Town along the Yangtze River },
        proceedings={Proceedings of the International Conference on Industrial Design and Environmental Engineering, IDEE 2023, November 24--26, 2023, Zhengzhou, China},
        publisher={EAI},
        proceedings_a={IDEE},
        year={2024},
        month={2},
        keywords={risk assessment; town scale; geological disaster; slope unit; disasterbearing},
        doi={10.4108/eai.24-11-2023.2343450}
    }
    
  • Jie Fu
    Xiuyuan Yang
    Aihong Shi
    Qing Zhang
    Songlin Liu
    Year: 2024
    Risk Assessment of Geological Disasters Based on Slope Units in Town Scale A case study of Dazhou Town along the Yangtze River
    IDEE
    EAI
    DOI: 10.4108/eai.24-11-2023.2343450
Jie Fu1, Xiuyuan Yang1,*, Aihong Shi1, Qing Zhang1, Songlin Liu2
  • 1: Center for Hydrogeology and Environmental Geology Survey
  • 2: Chongqing University
*Contact email: yangxiuyuan@mail.cgs.gov.cn

Abstract

With the rapid urbanization, the geological disaster risk has attracted increasing attention in the safety risk of town construction. This paper proposes a six-step technical framework for geological disaster risk evaluation in town,i.e.,slope unit division, rainfall condition analysis,automatic extraction of disaster-bearing bodies,hazard evaluation, quantitative evaluation of vulnerability, and risk evaluation.The migrant town along the Yangtze River,Dazhou Town in Wanzhou District of Chongqing,is selected as the study area.An improved hydrological analysis method for multi-scale division of slopes is proposed,which can be employed to extract the evaluation units for geological disaster risk.Based on the fifty-year rainfall conditions through the Gumbel distribution,the limit equilibrium method is adopted to estimate the stability and occurrence probability of slopes.Furthermore,the object-oriented approach is utilized to quickly extract information about buildings and traffic roads,etc.Finally,the hazard evaluation model and the vulnerability evaluation model are established to achieve the risk evaluation of geological disasters in towns,which are based on the slope unit and hazard sourceanalysis, respectively.According to the risk map34.5×103 m2 of buildings and 15.0×103 m2 of roads are in the extremely high risky zone, while about 36.3×103 m2 of buildings and 38.3×103 m2 of roads are in the high risky zone.