评估沙项目的洪水频率分析方法:埃塞俄比亚迪雷达瓦市政府的案例,埃塞俄比亚
Tarekegn Zeleke Gela1,2, Dawd Temam Ahmed1, Werku Koshe Hareru3
1Faculty of Civil and Environmental Engineering, Jimma Institute of Technology, Jimma University, P.O. Box 378, Jimma, Ethiopia.
概括
洪水频率分析 (FFA) 通过模拟降雨-流水,帮助埃塞俄比亚的沙设计. 这种以数据为导向的方法提高了水资源管理和脆弱社区的防洪准备.
科学领域:
- 水文学的水文学
- 水资源管理 水资源管理
- 环境工程 环境工程
背景情况:
- 埃塞俄比亚的德查图流域面临突发洪水和不规则的降雨,需要强有力的水资源管理策略.
- 沙对于半干旱地区的储水至关重要,但它们的设计需要准确的水文数据.
- 现有的基础设施和规划方法需要加强,以应对气候变化和社区需求.
研究的目的:
- 评估洪水频率分析 (FFA) 以优化德查图流域的沙设计和规划.
- 支持可持续的水资源管理,加强脆弱社区的防洪准备.
- 将水文建模与FFA整合起来,以改善水利基础设施的发展.
主要方法:
- 使用水文工程中心的水文建模系统 (HEC-HMS) 与SCS-CN和SCS单元水文仪方法进行降雨-流水建模.
- 马斯金纽姆路由的应用用于流动模拟.
- 使用Log-Pearson III,通用帕雷托 (GPA),通用极值 (GEV) 和正常分布进行洪水频率分析.
主要成果:
- 曲线数从78.5到83.07不等,盆地滞后时间在8.69到57.34小时之间.
- 在Kombolcha,峰值排放达到214.4 m3/s,年排放量从18,440.35 m3到72,553.7 m3不等.
- 罗格-皮尔森III分布估计100年峰值流量为165.36 m3/s,与HEC-HMS模拟密切一致.
结论:
- 在半干旱地区,FFA是优化沙设计,规划和实施的宝贵工具.
- 数据驱动的水文评估对于改善沙弹性和水资源管理至关重要.
- 该研究强调了可持续水资源和加强社区防洪准备的综合方法的重要性.
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