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Localized algal blooms induced by river inflows in a canyon type reservoir

机译：峡谷型水库中河流涌入引起的局部藻华

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摘要

The local response of the phytoplankton com munity to river inflow processes was investigated with modeling and field analyses in a long and narrow, stratified reservoir in mid-summer. The river water had high con centrations of phosphorus and nitrogen (ammonium and nitrate) and temperature had large variations at diurnal scales. As a consequence of the large variation in river temperature, the level of neutral buoyancy (the depth where the river water spreads laterally in the reservoir) oscillated between the surface (overflows) during the day, and the depth of the metalimnion (interflows) during the night. The reservoir remained strongly stratified, which favoured the presence of cyanobacteria. It is shown that under these conditions, nutrient-rich river water injected during overflows into the surface layers promoted the occurrence of localized algal blooms in the zones where the overflow mixed with the quiescent water of the reservoir. A series of hydrodynamic simulations of the reservoir were conducted both with synthetic and realistic forcing to assess the importance of river temperatures and wind driven hydrodynamics for algal blooms. The simulations confirmed that the river inflow was the main forcing mechanism generating the localized bloom.
机译：通过建模和现场分析，在仲夏一个长而狭窄的分层水库中研究了浮游植物群落对河水流入过程的局部响应。河水中磷和氮（铵和硝酸盐）的浓度很高，温度在日尺度上变化很大。由于河水温​​度的大幅度变化，白天的中性浮力（河水在水库中横向扩散的深度）在地表（溢流）之间波动，而金属离子的深度（跨流）在白天波动。晚上。储层仍保持强烈分层，这有利于蓝细菌的存在。结果表明，在这些条件下，溢流过程中注入到表层的营养丰富的河水促进了溢流与水库静态水混合的区域发生局部藻华。利用合成强迫和现实强迫对储层进行了一系列水动力模拟，以评估河水温度和风驱水动力对藻华的重要性。模拟证实，河水流入是产生局部水华的主要推动机制。

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  • 来源
    《Aquatic Sciences》 |2012年第2期|p.315-327|共13页
  • 作者

    Javier Vidal; Rafael Marce; Teresa Serra; Jordi Colomer; Francisco Rueda; Xavier Casamitjana;

  • 作者单位

    Department of Physics, Universitat de Girona,Campus de Montilivi, 17071 Girona, Spain,Marine Science Institute and Department of Ecology,Evolution, and Marine Biology, University of California,Santa Barbara, CA 93106, USA,Institute del Agua, Universidad de Granada,C/Ramon y Cajal, 4, 18071 Granada, Spain;

    Catalan Institute for Water Research (ICRA),Scientific and Technological Park of the University of Girona,Emili Grahit 101, 17003 Girona, Spain;

    Department of Physics, Universitat de Girona,Campus de Montilivi, 17071 Girona, Spain;

    Department of Physics, Universitat de Girona,Campus de Montilivi, 17071 Girona, Spain;

    Institute del Agua, Universidad de Granada,C/Ramon y Cajal, 4, 18071 Granada, Spain;

    Department of Physics, Universitat de Girona,Campus de Montilivi, 17071 Girona, Spain;

  • 收录信息 美国《科学引文索引》(SCI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    overflow; lacustrine; mixing; cyanobacteria; bloom; models;

    机译：溢出;湖相混合;蓝细菌盛开;楷模;

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