GHS, Institute of Environmental Assessment & Water Research (IDAEA), CSIC, Jordi Girona 18-26, 08034 Barcelona, Spain; GHS, Dept. Geotechnical Engineering and Geosciences, Technical University of Catalonia, UPC-Barcelona Tech, Jordi Girona 1-3, 08034 Barcelona, Spain.
GHS, Institute of Environmental Assessment & Water Research (IDAEA), CSIC, Jordi Girona 18-26, 08034 Barcelona, Spain.
Sci Total Environ. 2015 Jan 1;502:448-56. doi: 10.1016/j.scitotenv.2014.09.036. Epub 2014 Sep 30.
This work is motivated by a sound understanding of the chemical processes that affect the organic pollutants in an urban aquifer. We propose an approach to quantify such processes using mixing calculations. The methodology consists of the following steps: (1) identification of the recharge sources (end-members) and selection of the species (conservative and non-conservative) to be used, (2) identification of the chemical processes and (3) evaluation of mixing ratios including the chemical processes. This methodology has been applied in the Besòs River Delta (NE Barcelona, Spain), where the River Besòs is the main aquifer recharge source. A total number of 51 groundwater samples were collected from July 2007 to May 2010 during four field campaigns. Three river end-members were necessary to explain the temporal variability of the River Besòs: one river end-member is from the wet periods (W1) and two are from dry periods (D1 and D2). This methodology has proved to be useful not only to compute the mixing ratios but also to quantify processes such as calcite and magnesite dissolution, aerobic respiration and denitrification undergone at each observation point.
本工作基于对影响城市含水层中有机污染物的化学过程的深入理解。我们提出了一种使用混合计算来量化这些过程的方法。该方法包括以下步骤：（1）确定补给源（端元）和选择要使用的物种（保守和非保守），（2）确定化学过程，（3）评估包括化学过程在内的混合比。该方法已应用于巴塞罗那东北部贝索斯河三角洲（Besòs River Delta），其中贝索斯河是主要的含水层补给源。在 2007 年 7 月至 2010 年 5 月的四次野外考察中，共采集了 51 个地下水样本。为了解释贝索斯河的时间变化，需要三个河流端元：一个来自湿期（W1），两个来自干期（D1 和 D2）。该方法不仅可用于计算混合比，还可用于量化每个观测点的方解石和菱镁矿溶解、需氧呼吸和反硝化等过程。
