Impact of stormwater infiltration on rainfall-derived inflow and infiltration: A physically based surface–subsurface urban hydrologic model
Impact of stormwater infiltration on rainfall-derived inflow and infiltration: A physically based surface–subsurface urban hydrologic model
复制标题
雨水入渗对降雨流入和入渗的影响：基于物理的地表-地下城市水文模型
DOI：
10.1016/j.jhydrol.2022.127938
复制
发表时间：
2022
影响因子：
6.4
通讯作者：
Parolari, Anthony J.
中科院分区：
文献类型：
--
作者：
Zhang, Kun;Parolari, Anthony J.
绿色基础设施 (GI) 增强的雨水渗透的地下命运尚不清楚。 GI 将风暴流从地表重定向到地下，可以将其划分为蒸散或基流，或者被埋藏的基础设施沟渠拦截。渗入生活污水管道的雨水被称为降雨源流入和渗透 (RDII)，是渗入的雨水到达受纳水域的快速通道。为了量化渗透雨水在慢流和快流之间的分配，开发了一种基于物理的水文模型，集成了耦合的地表-地下过程和城市下水道系统，并应用于威斯康星州密尔沃基附近的下水道系统。在该地下水位较浅且生活污水系统存在渗漏的地区，RDII 占生活污水流量的 73-79%，占污水管网水平衡的 21%。敏感性分析表明，地表直流入水更多地受降水/蒸散比控制，地下入渗更多地受地下水位深度和生活污水管缺陷密度控制。 GI 的最大作用是将地表径流转化为蒸散量并减少城市下水道系统的峰值流量。 RDII 的体积对 GI 入渗的敏感度相对较低，因为直接相连的地表径流的减少被地下水流入的增加所抵消。中等程度的 GI 实施（不渗透区域的 5-10% 替代）使 RDII 量减少了 10%，但是，这些变化不到总体水平衡的 1%。另一方面，较高水平的 GI 实施（约 20% 的不渗透区域替换）导致 RDII 体积没有变化，因为更多渗透的雨水通过地下输送到下水道系统。这项研究强调了考虑 G I 的完整水文背景并平衡 GI 减少的径流和地下水渗入下水道的必要性。
The subsurface fate of stormwater infiltration enhanced by green infrastructure (GI) is unknown. GI redirects stormflows from the surface into the subsurface, which can be partitioned to evapotranspiration or baseflow, or be intercepted by buried infrastructure trenches. Stormwater that infiltrates sanitary sewer pipes is referred to as rainfall-derived inflow and infiltration (RDII) and represents a rapid pathway for infiltrated stormwater to reach receiving waters. To quantify the partitioning of infiltrated stormwater between slow and fast flows, a physically-based hydrologic model was developed integrating coupled surface–subsurface processes and urban sewer systems and applied to a sewershed near Milwaukee, WI. In this region with shallow groundwater table and leaky sanitary sewer systems, RDII accounted for 73–79% of the sanitary sewer flow volume and 21% of the sewershed water balance. Sensitivity analysis indicated that the surface direct inflow was controlled more by precipitation/evapotranspiration ratio and the subsurface infiltration was controlled more by groundwater table depth and sanitary sewer defect density. The largest effect of GI was to shift surface runoff to evapotranspiration and reduce peak flow in urban sewer systems. The volume of RDII was relatively less sensitive to GI infiltration because reductions in directly connected surface runoff were offset by increases in groundwater inflow. A moderate level of GI implementation (5–10% replacement of impervious area) reduced RDII volume by 10%, however, these changes were less than 1% of the overall water balance. On the other hand, higher levels of GI implementation (∼ 20% replacement of impervious area) resulted in no change to RDII volume as more infiltrated stormwater was routed to the sewer system through the subsurface. This study highlights the necessity of considering the full hydrologic context of G I and balancing the runoff reduction by GI and groundwater infiltration into sewers.