• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Marine Chemistry >Karstic groundwater discharge and seawater recirculation through sediments in shallow coastal Mediterranean lagoons, determined from water, salt and radon budgets
【24h】

Karstic groundwater discharge and seawater recirculation through sediments in shallow coastal Mediterranean lagoons, determined from water, salt and radon budgets

机译：根据水，盐和ra的预算确定，喀斯特地下水排放和海水通过浅滩地中海泻湖中的沉积物再循环

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Groundwater discharge to coastal water bodies is increasingly recognised to contribute significantly to coastal water and solute budgets. In order to evaluate the discharge of low-salinity groundwater of karstic origin and of recirculation of seawater through sediments into Mediterranean lagoons, a study was carried out in La Palme, Salses-Leucate and Thau lagoons on the French Mediterranean coastline in the dry summer months 2009, using radon and salinity as tracers. Whereas Salses-Leucate lagoon receives significant fluxes of karstic low-salinity groundwater, in La Palme and Thau lagoons, karstic groundwater fluxes are small, and have little effect on the lagoons' radon balance. A simultaneous water, salt and radon budget of the small La Palme lagoon (ca 50 ha surface area and 0.6 m mean depth) was used to simulate average salt and radon concentration over a one month period. The results indicate that despite its small flux (0.8-1.2% of lagoon volume per day) the discharge of low-salinity karstic groundwater contributes significantly to maintaining salinity lower than seawater in the seasonally closed lagoon, but makes only a minor contribution (7-18%) to the radon budget. Wind-driven seawater recirculation through sediments on the other hand is a major contributor, estimated at 22-60% of total radon fluxes to the lagoon, equivalent to a water flux of 1.4-7.0% of lagoon volume day~(-1). The remaining balance of Radon is supplied by diffusion and in-water production from decay of its parent nuclide. Using a stand-alone radon model without considering a water and salt balance would have considerably overestimated the flux of groundwater of karstic origin. Radon can be regarded as a proxy for other dissolved solutes such as nutrients and contaminants transported with groundwater and seawater recirculation fluxes. Nutrient and contaminant enrichment of sediments in Mediterranean lagoons is well documented. Wind-driven seawater recirculation through these sediments as documented in this study may remobilise these nutrients and contaminants. It may thus play a considerable role in lagoonal biogeochemical budgets, and may require consideration in water quality management in Mediterranean coastal lagoons.
机译：人们日益认识到向沿海水体的地下水排放对沿海水和溶质预算有重大贡献。为了评估岩溶性低盐度地下水的排放以及海水通过沉积物到地中海泻湖的回流，在干燥的夏季，对法国地中海沿岸的拉帕尔梅岛，萨尔塞斯-吕特和莱湖进行了一项研究。 2009年，以ra和盐度为示踪剂。 Salses-Leucate泻湖接收到大量的岩溶性低盐度地下水，而在La Palme和Thau泻湖中，岩溶性地下水通量很小，并且对泻湖的ra平衡影响很小。同时使用拉帕尔梅小泻湖的水，盐和ra预算（约50公顷表面积和0.6 m平均深度）来模拟一个月期间的平均盐和ra浓度。结果表明，尽管通量低（每天泻湖量的0.8-1.2％），但在季节性关闭的泻湖中，低盐度岩溶性地下水的排放显着有助于保持盐度低于海水，但仅占很小的比例（7- 18％）。另一方面，通过沉积物的风驱动海水再循环是主要的贡献者，估计占泻湖总ra通量的22-60％，相当于泻湖日流量的1.4-7.0％〜（-1）。 on的剩余平衡由其母核素的扩散和水中产生提供。如果使用不考虑水盐平衡的独立and模型，将大大高估了岩溶来源的地下水流量。 on可以被视为其他溶解性溶质的替代物，例如随地下水和海水再循环通量传输的营养物和污染物。地中海泻湖中沉积物的营养和污染物富集情况已得到充分证明。如本研究中所述，通过这些沉积物的风驱动的海水再循环可能使这些养分和污染物迁移。因此，它可能在泻湖生物地球化学预算中发挥重要作用，并可能需要在地中海沿岸泻湖的水质管理中加以考虑。

著录项

  • 来源
    《Marine Chemistry》 |2013年第20期|73-84|共12页
  • 作者

    Thomas C. Stieglitz; Pieter van Beek; Marc Souhaut; Peter G. Cook;

  • 作者单位

    School of Engineering & Physical Sciences. James Cook University, Townsville QLD 4811, Australia,Centre for Tropical Water and Aquatic Ecosystem Research, James Cook University, Townsviile QLD 4811, Australia,Laboratoire d'Etudes en Ceophysique et Oceanographie Spatiales UMR 5566, 14 av. Edouard Belin, 31400 Toulouse, France;

    Laboratoire d'Etudes en Ceophysique et Oceanographie Spatiales UMR 5566, 14 av. Edouard Belin, 31400 Toulouse, France;

    Laboratoire d'Etudes en Ceophysique et Oceanographie Spatiales UMR 5566, 14 av. Edouard Belin, 31400 Toulouse, France;

    CSIRO Water for a Healthy Country and National Centre for Groundwater Research and Training, School of the Environment, Flinders University, Adelaide SA 5001, Australia;

  • 收录信息
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Groundwater; Seawater recirculation; Lagoon; Radon; Water budget; Mediterranean; La Palme lagoon; Salses-Leucate lagoon; Thau lagoon;

    机译：地下水;海水再循环;泻湖;氡;水预算;地中海;拉帕尔玛泻湖;Salses-Leucate泻湖;陶泻湖;

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