Dokou Zoi, Karagiorgi Vasiliki, Karatzas George P, Nikolaidis Nikolaos P, Kalogerakis Nicolas
Technical University of Crete, School of Environmental Engineering, University Campus, Chania, 73100, Greece.
Environ Sci Pollut Res Int. 2016 Mar;23(6):5307-21. doi: 10.1007/s11356-015-5771-1. Epub 2015 Nov 13.
In recent years, high concentrations of hexavalent chromium, Cr(VI), have been observed in the groundwater system of the Asopos River Basin, raising public concern regarding the quality of drinking and irrigation water. The work described herein focuses on the development of a groundwater flow and Cr(VI) transport model using hydrologic, geologic, and water quality data collected from various sources. An important dataset for this goal comprised an extensive time series of Cr(VI) concentrations at various locations that provided an indication of areas of high concentration and also served as model calibration locations. Two main sources of Cr(VI) contamination were considered in the area: anthropogenic contamination originating from Cr-rich industrial wastes buried or injected into the aquifer and geogenic contamination from the leaching process of ophiolitic rocks. The aquifer's response under climatic change scenario A2 was also investigated for the next two decades. Under this scenario, it is expected that rainfall, and thus infiltration, will decrease by 7.7 % during the winter and 15 % during the summer periods. The results for two sub-scenarios (linear and variable precipitation reduction) that were implemented based on A2 show that the impact on the study aquifer is moderate, resulting in a mean level decrease less than 1 m in both cases. The drier climatic conditions resulted in higher Cr(VI) concentrations, especially around the industrial areas.
近年来，在阿索波斯河流域的地下水系统中观测到高浓度的六价铬（Cr(VI)），这引发了公众对饮用水和灌溉水质量的担忧。本文所述工作聚焦于利用从各种来源收集的水文、地质和水质数据，开发一个地下水流和Cr(VI)迁移模型。实现这一目标的一个重要数据集包括不同位置Cr(VI)浓度的大量时间序列，这些数据指示了高浓度区域，同时也作为模型校准位置。该区域考虑了Cr(VI)污染的两个主要来源：源于埋入或注入含水层的富铬工业废料的人为污染，以及蛇绿岩岩石淋滤过程产生的地质污染。还针对未来二十年研究了气候变化情景A2下含水层的响应。在这种情景下，预计冬季降雨量以及入渗量将减少7.7%，夏季将减少15%。基于A2实施的两个子情景（线性和可变降水减少）的结果表明，对研究含水层的影响是中等的，两种情况下平均水位下降均小于1米。气候条件变干导致Cr(VI)浓度升高，尤其是在工业区附近。
