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High-resolution sedimentary record of anthropogenic deposits accumulated in a sewer decantation tank
Anthropocene ( IF 3.6 ) Pub Date : 2020-03-12 , DOI: 10.1016/j.ancene.2020.100238
Jérémy Jacob , Alexandre Thibault , Anaëlle Simonneau , Pierre Sabatier , Claude Le Milbeau , Pascale Gautret , Luigi Ardito , Cédric Morio

To test the extent to which sediments accumulated in sewers may serve as high-resolution archives of urban evolution, this study examined a sedimentary succession deposited in a decantation tank of the combined sewer network of Orléans (France). The focus was on a 1.43 m sediment core drilled after 10 months of operation since the last cleaning. Sediments were stratigraphically organised into three distinct facies. The lower unit comprised organic remains, the middle unit gravels and sands and the upper unit was fine sands. The evolution of radionuclide activities, bile acid concentrations, and glass microspheres enabled sediments from wastewater and stormwater inputs to be distinguished. Precipitation events that affected the area were the main control on sediment deposition with organic-rich sediments accumulating from wastewater during dry weather and coarser, mineral sediments accumulating from stormwater during precipitation events. These results enable development of a chronological framework for sediment deposition. These findings reveal the potential of sewer sediment accumulations to record relevant information on the evolution of urban socio-ecosystems on monthly to annual scales with a relatively high time resolution.



中文翻译:

下水道倾析池中积累的人为沉积物的高分辨率沉积记录

为了测试下水道中堆积的沉积物在多大程度上可以用作城市演变的高分辨率档案,本研究检查了奥尔良(法国)联合下水道网络的a析池中沉积的沉积演替。自上次清洁以来,经过10个月的操作,钻探了一个1.43 m的沉积岩心。沉积物在地层上分为三个不同的相。下部是有机物,中部是砾石和沙子,上部是细沙。放射性核素活性,胆汁酸浓度和玻璃微球的演变使来自废水和雨水输入的沉积物得以区分。影响该地区的降水事件是沉积物沉积的主要控制措施,干旱天气期间废水中积累了富含有机物的沉积物,而降水事件期间降雨中则积累了较粗的矿物沉积物。这些结果使得能够开发出用于沉积物沉积的时间顺序框架。这些发现揭示了下水道沉积物积聚的潜力,可以以相对较高的时间分辨率以月度到年度规模记录有关城市社会生态系统演变的相关信息。

更新日期:2020-03-12
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