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首页> 外文会议>International Conference on Acid Rock Drainage >Riverine Flow-Through of Mine Pit Lakes: Improving both Mine Pit Lake and River Water Quality Values?
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Riverine Flow-Through of Mine Pit Lakes: Improving both Mine Pit Lake and River Water Quality Values?

机译：河流流过矿井湖泊：改善矿井坑湖和河水质量值？

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摘要

Coal mine pit lakes may form at mine closure when voids formed through mining extractions have extended below groundwater. Internationally, acid and metalliferous drainage (AMD) is a common problem for coal pit lake water quality. Even if not acidic, pit lake water quality may become degraded gradually through dissolution of contaminants and evapoconcentration. Contaminated coal pit lake waters can present significant risk to both surrounding and regional communities and natural environments. Pit lake waters may discharge into surface and groundwater; or directly present risks to wildlife, stock and human end users.Riverine flow-through is increasingly being proposed to mitigate pit lake water contamination. This paper presents the motivation for, and key processes and considerations regarding a flow-through final lake hydrology. International case studies as precedent and lessons for future application are also described from a review of literature describing pit lakes that use or propose surface water inflows and discharge as key components of their closure and pit lake management designs.Chemical and biological processes such as dilution, absorption and flocculation and sedimentation reduce solute loads from river and lake. We conclude that riverine lake flow-through may often be a valid mine closure strategy for pit lakes with poor water quality. Although, we caution that maintenance of existing riverine system values must be maintained first and foremost, we further suggest that decant river water quality may, in some circumstances, be improved; notably in examples of meso-eutrophic river waters flowing through slightly acidic pit lakes.Flow-through closure proposals for coal pit lakes must be scientifically justifiable and follow a risk assessment approach. Due to the high-uncertainty, biotic and physico-chemical attributes of both upper and lower river and lake should be well monitored. Monitoring should directly feed into an adaptive management framework approved by key stakeholders.
机译：煤矿坑湖泊可以在矿井封闭时形成，当通过采矿萃取形成的空隙延伸到地下水下方时。国际性地，酸和冶金排水（AMD）是煤坑湖水质量的常见问题。即使不是酸性，坑湖水质量也可能通过污染物的溶解和蒸发剂逐渐降解。受污染的煤坑湖泊水可能对周围和区域社区和自然环境产生重大风险。 Pit Lake Waters可能会排入表面和地下水;或直接出现对野生动物，股票和人体最终用户的风险。越来越多地提出流通的流动，以减轻坑湖水污染。本文提出了关于流通最终湖水文的动机和关键过程和考虑因素。作为未来申请的先例和经验教训的国际案例研究也可以从描述使用或提出表面水流入和放电作为其关闭和坑湖管理设计的关键部件的文献介绍。化学和生物过程如稀释，吸收和絮凝和沉降减少了河流和湖泊的溶质载荷。我们得出结论，河流湖流流动可能往往是水质良好水质湖泊的有效矿井封闭策略。虽然，我们必须首先保持现有的河流系统价值的维护，我们进一步暗示在某些情况下，倒河水质量可能会改善;值得注意的是，在流动微酸性坑湖的中间富养殖河水的例子中。煤坑湖流的汇流建议必须科学地合理，遵循风险评估方法。由于高不确定性，上下河流和湖泊的生物和物理化学属性应得到很好的监测。监测应直接进入受关键利益相关者批准的自适应管理框架。

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