Quantification of long-term wastewater fluxes at the surface water/groundwater-interface: an integrative model perspective using stable isotopes and acesulfame.
Quantification of long-term wastewater fluxes at the surface water/groundwater-interface: an integrative model perspective using stable isotopes and acesulfame.
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地表水/地下水界面长期废水通量的量化：使用稳定同位素和安赛蜜的综合模型视角
DOI：
10.1016/j.scitotenv.2013.06.092
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发表时间：
2014
期刊：
影响因子：
--
通讯作者：
van Geldern
中科院分区：
文献类型：
--
作者：
Engelhardt;Schulz;Ternes;Schüth;van Geldern
乙酰磺胺酸的适用性跟踪废水相关的地表水通量从流到潜流和河岸带在长期的时间进行了调查。将安赛蜜的迁移行为与水稳定同位素（δ 18 O或δ 2 H）的迁移行为进行了比较。一个校准模型的基础上联合反演的温度，安赛蜜，和测压头采用安赛蜜和水稳定同位素收集超过5个月的流和地下水的数据集的模型验证。通过计算地下水年龄，并与153天模拟时间后获得的预测安赛蜜羽流进行比较，估计地表水渗透引起的地下水中淡水的空间分布。这两个，地表水比率计算的混合方程从水稳定同位素和模拟乙酰磺胺酸质量通量，他们的能力，估计地下水内的废水相关的地表水流入的贡献进行了研究。本研究的结果指出，乙酰磺胺酸的应用，以跟踪地表水-地下水的相互作用适当的限制。安赛蜜完全忽略了与废水有关的地表水体积，这些体积在获得水流的条件下仍然留在潜流区。相比之下，在水流损失的条件下，这段时间后，停滞的水力交换，安赛蜜为基础的预测导致高估的地表水的体积高达25%的河岸带。如果渗透速度较慢，则一部分乙酰舒泛可能储存在较小的孔隙中，而当在快速流动的水条件下释放时，它将随着地下水流动方向进一步向下游移动。因此，在这种情况下，乙酰磺胺酸可能是一个不太理想的示踪剂在潜流和河岸带和其他环境示踪剂，如水稳定同位素的额外监测是强烈建议。
The suitability of acesulfame to trace wastewater-related surface water fluxes from streams into the hyporheic and riparian zones over long-term periods was investigated. The transport behavior of acesulfame was compared with the transport of water stable isotopes (δ18O or δ2H). A calibrated model based on a joint inversion of temperature, acesulfame, and piezometric pressure heads was employed in a model validation using data sets of acesulfame and water stable isotopes collected over 5 months in a stream and groundwater. The spatial distribution of fresh water within the groundwater resulting from surface water infiltration was estimated by computing groundwater ages and compared with the predicted acesulfame plume obtained after 153 day simulation time. Both, surface water ratios calculated with a mixing equation from water stable isotopes and simulated acesulfame mass fluxes, were investigated for their ability to estimate the contribution of wastewater-related surface water inflow within groundwater. The results of this study point to limitations for the application of acesulfame to trace surface water–groundwater interactions properly. Acesulfame completely missed the wastewater-related surface water volumes that still remained in the hyporheic zone under stream-gaining conditions. In contrast, under stream-losing conditions, which developed after periods of stagnating hydraulic exchange, acesulfame based predictions lead to an overestimation of the surface water volume of up to 25% in the riparian zone. If slow seepage velocities prevail a proportion of acesulfame might be stored in smaller pores, while when released under fast flowing water conditions it will travel further downstream with the groundwater flow direction. Therefore, under such conditions acesulfame can be a less-ideal tracer in the hyporheic and riparian zones and additional monitoring with other environmental tracers such as water stable isotopes is highly recommended.