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首页> 外文期刊>Current Science: A Fortnightly Journal of Research >Modelling for pollutant migration in the tannery belt, Dindigul, Tamil Nadu, India.
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Modelling for pollutant migration in the tannery belt, Dindigul, Tamil Nadu, India.

机译：印度泰米尔纳德邦Dindigul制革厂污染物迁移模型。

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摘要

Groundwater in and around Dindigul town in Tamil Nadu, India, is polluted due to discharge of untreated effluents from 80 functional tanneries. Total dissolved solids (TDS) in approximately 100 km2 area were observed ranging from 2000 to 30 573 mg/l in open dug wells. A mass transport model was constructed to study pollutant migration. The study area covering 240 km2 was chosen to construct the groundwater flow model in the weathered part of unconfined aquifer system. The shallow groundwater potential field computed through the flow model was then used as input to the mass transport model. MT3D computer code was used to simulate mass transport in groundwater system. The mass transport model was calibrated with field observations. The available database was, however, quite sparse. Notwithstanding, efforts were made to arrive at reasonable guesstimates of the characteristic parameters. Sensitivity analysis, an integral part of calibration was carried out whereby model parameters, viz. transmissivity, dispersivity, etc. were altered slightly and the effect on calibration statistics was observed. This study clearly indicates that transmissivity plays a more sensitive role than dispersivity, indicating that the migration phenomenon was mainly through advection rather than dispersion. The study also indicated that even if the pollutant sources were reduced to 50% of the present level, TDS concentration level in the groundwater, even after 20 years, would not be reduced below 50% of present level..
机译：印度坦米尔纳德邦Dindigul镇及其周围的地下水由于80家功能性制革厂未经处理的废水排放而受到污染。在露天挖井中观察到约100 km2区域中的总溶解固体（TDS）为2000至30 573 mg / l。建立了大众运输模型来研究污染物的迁移。选择面积为240 km2的研究区域来构建无侧承压含水层系统风化部分的地下水流模型。然后，将通过流动模型计算出的浅层地下水势场用作质量传输模型的输入。 MT3D计算机代码用于模拟地下水系统中的物质传输。大众运输模型已通过现场观察进行了校准。但是，可用的数据库非常稀疏。尽管如此，已作出努力以合理估计特性参数。进行灵敏度分析，这是校准不可或缺的一部分，因此模型参数即。透射率，分散度等略有变化，并观察到对校准统计的影响。这项研究清楚地表明，透射率比色散更敏感，表明迁移现象主要是通过对流而不是色散。研究还表明，即使污染物源减少到目前水平的50％，即使20年后，地下水中的TDS浓度水平也不会降低到目前水平的50％以下。

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