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June 3, 2026Journal of China institute of water resources and hydropower research0 citations

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

XHXinhang HEXHXiaoli HAOMXMei XU

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.

Abstract

山区河道洪水严重威胁山前建成区安全,通过山前建设蓄滞洪区,可蓄滞洪水、降低洪水流速、削减河道洪峰,有效缓解洪水对建成区的冲击。本研究以北京市温榆河流域北沙河为例,通过基于动力学原理的数值模拟方法,对山区河道洪水自由下泄情景以及经过蓄滞洪区调蓄后下泄情景分别进行洪水演进过程模拟计算,对比分析北沙河修建蓄滞洪区前后不同重现期洪水可能导致的洪水风险程度与分布,实现对蓄滞洪区防洪减灾成效的评估。分析结果认为:不同重现期洪水情景下,北沙河山前蓄滞洪区均能显著降低下游河道洪峰,减少河道两岸受淹面积与水深,降低区域洪水风险;整体减灾成效受蓄滞洪区规模制约,北沙河蓄滞洪区在20年一遇洪水情景下可达最高减灾效益,gdp损失减少率达27.55%,50年一遇设计洪水次之,为22.45%。利用洪涝过程数值模拟手段对蓄滞洪区等规划或在建防洪工程进行洪水情景分析,通过对比分析工程前后区域洪涝风险,可有效实现对工程减灾成效的量化分析与评估。

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Cite This Study

HE et al. (2026) studied this question.

synapsesocial.com/papers/6a1fc3a6dee9eb8c0dce51d0https://doi.org/10.3724/j.jiwhr.20250173
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