School of Civil and Environmental Engineering and Geography Science, Ningbo University, Ningbo 315211, China E-mail:
School of Civil and Environmental Engineering and Geography Science, Ningbo University, Ningbo 315211, China.
Water Sci Technol. 2023 Dec;88(11):2940-2954. doi: 10.2166/wst.2023.386.
A 16-month monitoring program was conducted on a prototype sanitary system in a coastal city in China. The groundwater infiltration (GWI) on dry weather days and the rain-derived inflow and infiltration (RDII) on wet weather days were quantified and analyzed. The proportion of monthly averaged GWI to total flow can be as high as 70% during the observation period mainly due to the high groundwater level. The results also show that the ratio of RDII volume to total rainfall volume (defined as R-value) reaches a limited value of approximately 10% for the studied system when the total rainfall depth increases. A reference indicator R for the limited R-value was proposed for assessing the conditions of sewer systems in terms of RDII. The R value depends on local sewer conditions and in general, a lower R value represents a better performance on RDII and vice versa. This study enriches the case studies on the performance of a specific sanitary sewer system on inflow and infiltration in a typical coastal city with exceptionally high groundwater levels, excess rainfall events in the monitoring season and possible typhoon events, which addresses the unique locational and hydrological properties of a representative coastal city.
在中国沿海城市的一个原型卫生系统上进行了为期 16 个月的监测计划。量化和分析了干旱天气下的地下水渗透（GWI）和湿天气下的雨水入渗和渗透（RDII）。在观测期间，由于地下水水位较高，每月平均 GWI 占总流量的比例高达 70%。结果还表明，对于研究系统，当总降雨量增加时，RDII 体积与总降雨量（定义为 R 值）的比值达到约 10%的有限值。提出了一个参考指标 R 来评估 RDII 情况下下水道系统的条件。R 值取决于当地的下水道条件，一般来说，较低的 R 值表示 RDII 性能更好，反之亦然。本研究丰富了在地下水水位异常高、监测季节降雨过多以及可能发生台风等特殊情况下特定卫生下水道系统的入渗和入渗性能的案例研究，解决了典型沿海城市独特的地理位置和水文特性。
