Effect of freeze - thaw cycles on bioretention performance for water quality improvement

城市化导致由于道路、停车场和建筑物而增加的表面不渗透性。与 雨水渗透的机会减少，产生大量径流，增加了风险 洪水泛滥和水质恶化。 在这种情况下，低影响开发已经开发并涉及使用雨水控制系统 例如生物滞留细胞，也称为雨水花园。 生物滞留是土壤中的凹陷，包括具有增强能力的工程土壤介质， 渗透水并保留污染物。这些系统的设计是由一般建议决定的 来自当地的保护当局，没有在寒冷的气候中进行过广泛的测试。拟建项目 将评估反复冻融循环对水质的影响， 实验室规模的生物滞留细胞。将设计用于真实代表冻融循环的柱实验， 填充了来自安大略现有生物保留区的未受干扰的土芯。该项目将能够更好地 了解寒冷气候对生物滞留效率的影响，并帮助改进这些生物滞留的设计。 更好地保护水产资源。

Urbanization leads to increased impermeabilization of surfaces due to roads, parking lots, and buildings. With less opportunities for infiltration, rainwater generates large volumes of runoff that contribute to increased risks of flooding and degradation of water quality. In this context, Low Impact Development has developed and involves the use of stormwater control systems such as bioretention cells, also called rain gardens. Bioretention are depression in the soil that includes an engineered soil media with an enhanced ability to infiltrate water and retain contaminants. The design of these systems is dictated by general recommendations from local conservation authorities that have not been extensively tested in cold climate. The proposed project will evaluate the effects of repeated freezing and thawing cycles on the water quality that exfiltrate from lab-scale bioretention cells. Column experiments designed to realistically represent freeze - thaw cycles will be filled with undisturbed soil cores from an existing bioretention from Ontario. The project will enable to better understand the impact of cold climate on the efficiency of bioretention, and help improve the design of these system for a better protection of aquatic resources.