...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Water resources research >Groundwater flow dynamics and arsenic source characterization in an aquifer system of West Bengal, India
【24h】

Groundwater flow dynamics and arsenic source characterization in an aquifer system of West Bengal, India

机译：印度西孟加拉邦含水层系统中的地下水流动力学和砷源特征

获取原文
获取原文并翻译 | 示例
   

获取外文期刊封面封底 >>

       
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Numerical groundwater flow modeling, reverse particle tracking, and environmental tracers are used to locate the source of geogenic As affecting an aquifer in West Bengal. The aquifer is hosted by point-bar sands deposited in a meandering fluvial environment. Wells tapping the aquifer exhibit As concentrations up to 531 μg/l. High-As groundwaters are recharged in ponds marking an abandoned river channel. The source of As is traced to the underlying fine-grained channel-fill sediments. Arsenic release within these sediments is accompanied by a concomitant release of Br and DOC indicating that these species may be decay products of natural organobromines codeposited along with As. Mass transfer of As to the dissolved phase and its flushing from source sediments are described using a simplified reactive solute transport model. Based on this model, a characteristic reaction time for mass transfer is estimated at 6.7 years. Average groundwater residence times in the source are estimated to have declined from 16.6 to 6.6 years with the advent of intensive irrigation pumping. The ratio of residence and reaction times, a Dam-kohler number, has declined correspondingly from 2.49 to 0.99, indicating a shift from transport to reaction rate limited As mobilization. Greater insight into the As problem in SE Asia may be achieved by shifting the focus of field investigations from aquifers to potential contamination sources in aquitards.
机译：数值地下水流模拟，反向颗粒追踪和环境示踪剂用于定位影响西孟加拉邦含水层的地缘砷源。蓄水层由沉积在蜿蜒河流环境中的点状条状砂岩所包裹。开采含水层的井中As的浓度最高为531μg/ l。高砷地下水在标有一条废弃河道的池塘中补给。砷的来源可追溯到下层的细颗粒河道沉积物。这些沉积物中的砷释放伴随着Br和DOC的释放，表明这些物种可能是与As共存的天然有机溴的腐烂产物。使用简化的反应性溶质运移模型描述了砷向溶解相的传质及其从源沉积物中的冲洗。基于该模型，传质的特征反应时间估计为6.7年。随着集约化灌溉抽水的到来，水源中的平均地下水停留时间估计已从16.6年减少到6.6年。停留时间和反应时间之比，Dam-kohler数从2.49下降至0.99，表明从迁移转移到反应速率受As迁移限制。通过将现场调查的重点从含水层转移到海quit中的潜在污染源，可以更深入地了解东南亚的砷问题。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号