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Export of dissolved and suspended matter from the main estuaries in South Portugal during winter conditions

机译：在冬季条件下出口来自南葡萄牙的主要河口的溶解和悬浮物质

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摘要

Estuaries are essential drivers of primary productivity in coastal waters through the export of dissolved and suspended material. This study aims at quantifying this fertilization process at the two main estuaries in South Portugal, where typical low river discharge conditions occur in winter due to strong flow regulation by upstream dams and seldom-local rain events. Data were collected across the channel of the lower Arade (10/01/2018) and Guadiana (04/02/2019) estuaries during a semi-diurnal tidal cycle with intermediate tidal ranges (1.5 m and 2.2 m, respectively). Current velocity records were completed with hourly water quality measurements (temperature, salinity, pH, dissolved oxygen, suspended solids, chlorophyll a and nutrients) for determination of the along channel fluxes and residual mass transport of dissolved and suspended matter across the channel sections. The results show that the two estuaries were characterized by distinct water circulation patterns and tidal properties (e.g., standing wave at the Arade, mixed wave at the Guadiana). The concentration of dissolved and particulate matter displayed a general similar anti-phase pattern of variations with tidal height at both sites. The corresponding fluxes were generally strongest during the ebb phase. Thus, the residual mass transport was seaward, indicating that both estuaries contribute to fertilize adjacent coastal waters by exporting nutrients (order of kg), chlorophyll a (order of kg) and suspended solids (up to tons). Moreover, transport differences at both estuaries reflect specific discharge flow and environmental conditions as well as contamination sources close to the study areas. In particular, the signatures of a discharge event from a water treatment plant at the Arade and of coastal upwelling at the Guadiana were identified.
机译：通过出口溶解和悬浮材料，河口河口是沿海水域初级生产力的基本驱动因素。本研究旨在量化南葡萄牙两个主要河口的这种施肥过程，其中冬季出现典型的低河流放电条件由于上游水坝和局部雨季的强大流量调节。在下游（10/01/2018）和瓜迪亚纳（04/02/2019）期间，在半昼夜潮汐循环中收集数据，中间潮汐范围（分别为1.5米和2.2米）。目前的速度记录完成了每小时水质测量（温度，盐度，pH，溶解氧，悬浮固体，叶绿素A和营养物），用于沿通道部分测定沿通道助熔剂和残留的溶解物的溶解物质。结果表明，两种河口的特征在于不同的水循环模式和潮汐特性（例如，鸟类的常设波，瓜迪亚纳的混合波）。溶解和颗粒物质的浓度显示出在两个位点的潮汐高度的一般相似的抗相形模式。在EBB相期间，相应的助熔剂通常最强。因此，剩余的大规模运输是向后的，表明两个河口通过出口营养素（kg阶），叶绿素A（kg阶）和悬浮固体（最高吨）而有助于施肥邻近的沿海水域。此外，两个河口的运输差异反映了特定的排放流量和环境条件以及靠近研究区域的污染源。特别是，鉴定了来自遗址和在瓜迪亚纳的沿海上升的水处理厂的排放事件的签名。

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  • 来源
    《Marine Chemistry》 |2020年第20期|103827.1-103827.15|共15页
  • 作者

    Correia C.; Torres A. F.; Rosa A.; Cravo A.; Jacob J.; de Oliveira Junior L.; Garel E.;

  • 作者单位

    Univ Algarve FCT CIMA Campus Gambelas P-8005139 Faro Portugal;

    Univ Algarve FCT CIMA Campus Gambelas P-8005139 Faro Portugal;

    Univ Algarve FCT CIMA Campus Gambelas P-8005139 Faro Portugal;

    Univ Algarve FCT CIMA Campus Gambelas P-8005139 Faro Portugal;

    Univ Algarve FCT CIMA Campus Gambelas P-8005139 Faro Portugal;

    Univ Algarve FCT CIMA Campus Gambelas P-8005139 Faro Portugal;

    Univ Algarve FCT CIMA Campus Gambelas P-8005139 Faro Portugal;

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  • 正文语种 eng
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  • 关键词

    Arade estuary; Guadiana estuary; Transport; Nutrients; Chlorophyll a;

    机译：arade extuary;瓜迪亚娜河口;运输;营养素;叶绿素a;

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