Identification and quantification of diffuse groundwater pollution in a mineralised watershed

Identification and quantification of diffuse groundwater pollution in a mineralised watershed
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矿化流域弥散性地下水污染的识别和量化

DOI:
10.1039/d3ew00194f
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发表时间:
2024
期刊:
Water Research & Technology
影响因子:
--
通讯作者:
Todd A
Todd A
中科院分区:
--
文献类型:
--
作者:
Todd A

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示踪剂注入和天气采样实验进行了在一个非常低的径流事件,以定位和量化废弃的Nantymwyn铅矿地下水金属污染源的Tywi河(威尔士卡马森郡)的支流流域。高分辨率采样22流位置和12流入沿着2公里长的Nant y Bai部署。这种高空间分辨率的取样技术可以确定金属污染的点源和扩散源,从而可以量化它们对整个河流负荷的贡献。结果发现,最高比例的过滤锌负荷来自扩散的地下水来源,从上部尾矿(43%),和过滤铅负荷的最高比例来自扩散的地下水来源,从下部尾矿(40%),从一个领域的Tywi河洪泛区较小的输入。这些结果表明,示踪剂稀释和天气采样是一个强大的工具,以定位和分配地下水金属污染的扩散源在小,矿化流域。
A tracer injection and synoptic sampling experiment was carried out in a tributary catchment of the River Tywi (Carmarthenshire, Wales) during a very low streamflow event to locate and quantify sources of groundwater metal pollution from the abandoned Nantymwyn Pb mine. High resolution sampling at 22 stream locations and 12 inflows along a 2 km stretch of the Nant y Bai was deployed. This high spatial resolution sampling technique allowed point and diffuse sources of metal pollution to be identified enabling their contribution to the overall stream load to be quantified. It was found that the highest proportion of filtered Zn load originated from diffuse groundwater sources from the upper mine tailings (43%), and that the highest proportion of filtered Pb load originated from diffuse groundwater sources from the lower mine tailings (40%), with smaller inputs from a field on the River Tywi floodplain. These results demonstrate that tracer dilution and synoptic sampling is a powerful tool to locate and apportion diffuse sources of groundwater metal pollution in small, mineralised watersheds.
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