Fakultät III, Umwelt und Technik, Leuphana Universität Lüneburg, Suderburg, Germany.
Water Sci Technol. 2010;62(1):92-8. doi: 10.2166/wst.2010.287.
Vast volumes of groundwater are drained by urban sewer systems. This unwanted flow component intrudes into sewer systems through leaky joints or connected house drains. However, unlike urban storm drainage, it has a high seasonal variation corresponding to groundwater storage and long slow recessions similar to baseflow in rivers also fed by shallow groundwater exfiltrating into the surface waters. By applying the nonlinear reservoir algorithm as used for baseflow separation from total flow in a river, groundwater flow is separated from daily measured influents to treatment plants in Lower Saxony and Baden-Württemberg, Germany and in the Terkos Lake watershed near Istanbul, Turkey. While waste water flows vary only moderately within a year, separated intruded groundwater flows show recessions and seasonal variations correlated to baseflow in neighbouring rivers. It is possible to conclude that recession characteristics of treatment plant influents allow quantification and prediction of groundwater intrusion into sewer systems.
城市排水系统会抽取大量地下水。这些不受欢迎的水流会通过渗漏的接头或连接的房屋排水系统进入排水系统。然而，与城市雨水排水不同，它具有与地下水储存相对应的高季节性变化，并且与河流的基流相似，具有缓慢的长期消退，也受到浅地下水渗出进入地表水的影响。通过应用非线性储层算法，从河流总流量中分离基流，从德国下萨克森州和巴登-符腾堡州以及土耳其伊斯坦布尔附近的特克尔斯湖流域的每日测量进水中分离出地下水流量。虽然废水中的水流在一年内变化不大，但分离出的侵入地下水流量显示出与相邻河流基流相关的消退和季节性变化。可以得出结论，处理厂进水的消退特征允许量化和预测地下水对排水系统的入侵。
