浑河扇地典型区域地下水有机污染物运移与预测

来源期刊:中南大学学报(自然科学版)2014年第7期

论文作者:李霄 都基众 崔健 柴璐 邸志强 王晓光

文章页码:2529 - 2538

关键词:浑河冲洪积扇;Visual Modflow数值模拟软件;BaP;水流模型;溶质运移模型

Key words:Hunhe River alluvial fan; Visual Modflow software; BaP; flow model; solute transportation model

摘    要:在地下水污染调查的基础上,根据室内外实验和文献资料获取的参数,利用Visual Modflow数值模拟软件建立浑河冲洪积扇地下水流模型;以水流模型为基础建立浑河扇中游,浑河与细河地表水交叉污染地下水的典型区域的溶质运移模型,选取检出率最高的苯并(a)芘(BaP)作为模拟因子进行有机污染物运移规律的研究与预测,预报BaP在未来10年内的迁移特征,进而提出区域规划建议。研究结果表明:以地表水为污染源,至未来10年,BaP对周边的最大影响面积约9.54 km2,潜水中预测的质量浓度峰值为1.80 μg/L,承压水中预测的质量浓度峰值为0.08 μg/L;对流-弥散作用是BaP迁移的驱动力,生物降解及吸附作用使其持续衰减;地下黏性土分布连续的区域,BaP扩散滞缓,黏性土对BaP具有阻滞作用。建议将BaP影响区规划为景观带,从而降低污染水发病率。

Abstract: Based on the groundwater pollution investigation, the Visual Modflow software was used to establish the groundwater flow model of Hunhe River alluvial fan with the parameters which were acquired from in-outdoor experiment and literature data. And then, the solute transportation model of the typical region was established, that was polluted by the Hunhe River and Xihe River surface water together in the middle of the fan, based on the flow model. Benzo(a) pyrene(BaP) with the highest detection rate of the organic contamination was selected as the simulation factor to research and forecast its migration rule. According to the migration character of BaP in the next 10 years, the regional programming advice was put forward. The results show that BaP from the contaminated surface water impacts the surrounding region as the biggest area of 9.54 km2 after 10 years, the prediction peak value of BaP in the phreatic aquifer is 1.80 μg/L, and 0.08 μg/L in the confined aquifer. Convection-dispersion effect is the driving force for migaration of BaP, and the biodegradation and adsorption makes its continuous attenuation. BaP’s diffusion is slow in the region of consecutive clay underground, as it can be blocked by the clay. The BaP influencing region will be planned for landscape to reduce the incidence of pollution water.

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