Quantitative analysis and evaluation of disaster reduction effectiveness of flood storage and detention areas based on numerical simulation

Key Points

• The study aims to evaluate the effectiveness of flood storage areas in reducing flood risk in urban regions, using numerical simulation.
• Conducted numerical simulations of flood scenarios before and after the creation of flood storage areas in the Beisha River region.
• Analyzed the impact of various flood return periods on flood risks and affected areas.
• Utilized hydraulic dynamics principles to assess flood evolution and mitigation effects.
• Flood storage areas significantly reduced downstream flood peaks, impacting up to 27.55% in GDP loss reduction during 20-year flood scenarios.
• Flood risk areas and water depths were lowered dramatically, resulting in enhanced urban safety.
• The effectiveness of the mitigation was constrained by the scale of the flood storage facilities, with varying benefits observed for different flood return periods.