沉积物特性和捕获盆地中的积累:加拿大卡尔加里的一个案例研究
Run Zhang1, David Z Zhu1,2, Dave Chan1,3
1Department of Civil and Environmental Engineering, University of Alberta, Edmonton, Alberta T6G 1H9, Canada.
概括
定期清理捕获盆地 (CB) 对于城市雨水管理至关重要. 有证据表明,当自由深度比接近0.2时进行清洁,以防止洪水和污染.
科学领域:
- 城市水文学 城市水文学
- 环境工程 环境工程
- 风暴水管理风暴水管理
背景情况:
- 捕捞盆地 (CB) 对于城市雨水基础设施至关重要,捕获街道排水沉积物和污染物.
- 维护不足导致沉积物积累,增加洪水风险和水污染.
研究的目的:
- 研究CBs中的沉积特征和积累模式.
- 为城市雨水基础设施制定基于证据的清洁战略.
主要方法:
- 在阿尔伯塔省卡尔加里进行了实地研究,分析了2023-2024年的28个CB.
- 检查了沉积物的特性,积累率和金属度.
- 根据自由深度比进行了沉积物选分析.
主要成果:
- 沉积物积累和金属度随着土地使用而变化,在道路和房屋附近更高.
- 观察到垂直分层:较小的颗粒与较高的金属在底部,更大的颗粒形成表面盔甲.
- 当自由深度比率下降到0.2.2以下时,观察到显著的扫地增加.
结论:
- 土地使用影响CB沉积物的组成和积累.
- 沉积物分层和装甲保护污染物免受冲洗.
- 建议在自由深度比接近0.2时清洁CB,以减轻风险.
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