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首页> 外文期刊>Australian Geomechanics >Changes in subsurface water quality during coastal canal estate constructions
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Changes in subsurface water quality during coastal canal estate constructions

机译：沿海运河住宅建设过程中地下水质的变化

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Construction of coastal canal estates has increased in recent times in Australia. The lowering of the watertable is required during certain canal construction periods. Coastal low lands contain can contain pyrites and associated potential acid sulfate soils. Dewatering or lowering of the water table to allow for dry excavation, may permit oxidation of the pyritic soil causing acid generation. Saline intrusion may also occur via lowering of the watertable. A paucity of literature on coastal canal estates led to this study, which investigated the subsurface water quality during construction of a canal estate. Groundwater depth, pH, dissolved oxygen, titrated acidity and salinity were monitored on site at the Lake Kawana development in Queensland, Australia. Groundwater monitoring was carried out before, during and after the dewatering program. Data analysis showed that water depth increased during dewatering activities and decreased after re-flooding. The dissolved oxygen, titrated acidity and salinity levels rose during periods of increased groundwater depth, while pH levels fell. The increase in oxygen availability and the associated increase in acidity, may lead to dissolution of heavy metals, but monitoring data was lacking in this regard. Since salinity may increase due to other close by saline surface water bodies, further studies are required to understand subsurface flow patterns during dewatering operations. Computer simulation models could be developed to help determine the flow of contaminants during dewatering and re-flooding operations.
机译：最近在澳大利亚，沿海运河区的建设有所增加。在某些运河建设期间，需要降低地下水位。沿海低地可能包含黄铁矿和潜在的酸性硫酸盐土壤。脱水或降低地下水位以进行干挖，可能会使黄铁矿土壤氧化，从而产生酸。降低地下水位也会导致盐分侵入。缺乏沿海运河地区的文献导致了这项研究，该研究调查了运河地区在建造过程中的地下水质。在澳大利亚昆士兰州的卡瓦纳湖开发区现场监测了地下水深度，pH，溶解氧，滴定的酸度和盐度。在脱水程序之前，之中和之后进行了地下水监测。数据分析表明，水深在脱水过程中增加，而在重新注水后减少。在地下水深度增加期间，溶解氧，滴定的酸度和盐度水平上升，而pH值水平下降。可用氧量的增加以及相应的酸度的增加可能导致重金属的溶解，但在这方面缺乏监测数据。由于盐度可能由于盐水表面水体的其他封闭而增加，因此需要进一步研究以了解脱水操作期间的地下流动模式。可以开发计算机仿真模型来帮助确定在脱水和注水操作过程中污染物的流量。

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