Urban flood risk assessment based on DBSCAN and K-means clustering algorithm

作者：Jianwei Li, Anna Zheng, Wei Guo, Nairwita Bandyopadhyay, Yanji Zhang, Qianfeng Wang · 发表于：Geomatics Natural Hazards and Risk · 年份：2023 · DOI：10.1080/19475705.2023.2250527 · 被引用次数：48 · 研究领域：Flood Risk Assessment and Management、Hydrology and Drought Analysis、Hydrology and Watershed Management Studies

Urban flood risk assessment plays a crucial role in disaster risk reduction and preparedness. It is essential to mitigate flood risks and establish a comprehensive analysis of factors influencing flood risk, as well as classify risk levels, in order to provide a clear model for risk assessment. This article aims to propose an efficient assessment method that can classify urban flood risk levels and assist cities in flood risk management, particularly in identifying high-risk areas. The study area chosen for this method is the municipal district of Fuzhou City, located in Fujian Province, China. The proposed method utilizes the Urban Flood Risk Assessment Index, which is developed based on the risk-vulnerability framework. It integrates the combinatorial empowerment method, Density-Based Spatial Clustering of Applications with Noise (DBSCAN), and the K-means algorithm to cluster the quantitative risk factors, enabling a comprehensive analysis of the risk results. The findings demonstrate that areas characterized by intense extreme rainfall, lower elevation, gradual slope, high runoff coefficient, and high population density tend to exhibit higher flood risk. Moreover, the dominant factors contributing to high risk in different regions vary. The results obtained from this method align well with the distribution of historical flood points, indicating the effectiveness of the risk map prepared using this approach. In comparison to the results obtained from the single clustering m...