硅砂蓄水池在海绵城市建设中的研究与应用OA

The silica sand storage reservoir,as a novel Sponge City infrastructure,achieves technological breakthroughs in urban stormwater management through nature-based approachs.Combining theoretical analysis with case studies,this study systematically analyzes the self-purification mechanism,water storage and purification mechanism,and breathable oxygen enrichment principle of silica sand reservoirs.It further explores their structural and functional characteristics,with empirical validation through the engineering implementation of the silica sand storage and self-purification system at the lakebed of Beijing's Longtan West Lake Park.Research results demonstrate that the reservoir establishes a purification system integrating"desert aeolian sand skeleton+biological filter pond functions",achieving efficient micron-level filtration of stormwater(suspended solids removal rate≥95%).Through structural design of breathable and impermeable materials and natural dynamic mechanisms,it realizes non-powered oxygenation(dissolved oxygen 8～10 mg/L)via temperature difference-driven micro-circulation,facilitating bidirectional exchanges of airflow,substances,and energy among the atmosphere,water body,and soil.This significantly enhances water self-purification capacity while addressing technical limitations of traditional reservoirs such as sedimentation issues and high maintenance costs.Engineering practices confirm that the system effectively mitigates combined sewer overflow pollution,with effluent water quality consistently meeting Class IV limits of the Environmental Quality Standards for Surface Water.Annual rainwater resource utilization reaches 930 000 m³,achieving localized retention of 85%rainfall runoff within the watershed.This research provides theoretical foundations and technical support for stormwater management in Sponge City construction,offering significant practical implications for optimizing urban water environments.