Collection systems in coastal cities are often below the groundwater table, leading to groundwater infiltration (GWI) through defects such as cracks and poor lateral connections. Climate-change-induced sea level rise (SLR) will raise groundwater levels, increasing the head and thus the inflow. A method has been developed to predict GWI when groundwater levels change using calibration with sewershed flow monitoring data. The calibration results in a parameter that characterizes the porosity of the collection system. A case study is presented for a coastal city with reliable flow monitoring data for eight days that resulted in a large range of effective defect sizes (minimum 0.0044 to maximum 0.338 radians), however, the range of predicted future GWI in currently submerged pipes varied by only 12% from the mean. The mean effective defect predicts 70 to 200% increases in GWI due to SLR of 0.3 to 0.9 m (1 to 3 ft), respectively, for currently submerged pipes. Predicted additional GWI for pipes that will become submerged due to SLR will increase GWI to values that approach or exceed the current average dry weather flow. This methodology can be used for planning of infrastructure improvements to enhance resiliency in coastal communities.

中文翻译：

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受海平面上升影响的沿海下水道地下水渗入量的流量校准方法

沿海城市的收集系统通常位于地下水位以下，导致地下水通过裂缝和横向连接不良等缺陷渗入（GWI）。气候变化引起的海平面上升 (SLR) 将提高地下水位，增加水头，从而增加流入量。已经开发出一种方法来预测地下水位变化时使用下水道流量监测数据校准的 GWI。校准产生表征收集系统孔隙率的参数。一个沿海城市的案例研究提供了八天的可靠流量监测数据，导致了大范围的有效缺陷尺寸（最小 0.0044 到最大 0.338 弧度），但是，当前水下管道中预测的未来 GWI 的范围变化了仅与平均值相差 12%。对于当前水下管道，平均有效缺陷预测 GWI 增加 70% 到 200%，因为 SLR 分别为 0.3 到 0.9 m（1 到 3 ft）。由于 SLR 将被淹没的管道的预测额外 GWI 将增加 GWI 到接近或超过当前平均干旱天气流量的值。这种方法可用于规划基础设施改进，以提高沿海社区的弹性。