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首页> 外文期刊>Estuarine Coastal and Shelf Science >Tidally driven pore water exchange in offshore intertidal sandbanks: Part I. Field measurements
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Tidally driven pore water exchange in offshore intertidal sandbanks: Part I. Field measurements

机译：潮间带潮汐滩岸潮汐驱动的孔隙水交换：第一部分。现场测量

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In recent years blooms of the toxic marine cyanobacteria Lyngbya majuscula have been frequently observed in a system of offshore intertidal sandbanks in Moreton Bay, Australia. Past research suggests that these blooms are linked to the presence of bio-available forms of iron. Using hydraulic and pore water chemistry data collected from a shore normal transect at an offshore bloom site, the role of tidally driven exchange as a potential mechanism for delivery of bio-available iron across the sediment-water interface was examined. Field data revealed a residual pore water flow system in the sandbank, with seawater entering the upper sandbank platform and discharging through the bank edge. Upward flow and elevated near-surface dissolved Fe(II) concentrations (>20 μM Fe(II) at -0.05 m depth) were measured simultaneously in the discharge zones at the sandbank edge. The measured concentrations were more than four times greater than concentrations previously shown to stimulate L. majuscula growth. These results suggest that the tidally driven exchange mechanism might be capable of delivering dissolved Fe(II) to sites within offshore intertidal sandbanks where blooms of L. majuscula have been observed. While the source of the iron was not identified, potential candidates are discussed. These findings have implications for the current conceptual model for L. majuscula blooms in offshore intertidal sandbanks within Moreton Bay. Further investigations are required to fully understand the role of tidally driven exchange in controlling the export of bio-available iron to coastal waters at the field site. In particular there is a need to better assess the link between the pore water flows and the geochemical reactions that might occur along the flow path.
机译：近年来，在澳大利亚摩顿湾的近海潮间带沙丘系统中经常观察到有毒的海洋蓝藻华藻（Lyngbya majuscula）的开花。过去的研究表明，这些水华与生物可利用形式的铁的存在有关。使用从近海开花点的海岸正断面收集的水力和孔隙水化学数据，检验了潮汐驱动交换作为跨沉积物-水界面输送生物利用铁的潜在机制的作用。现场数据显示，沙洲中存在残留的孔隙水流系统，海水进入沙洲上层平台并通过河岸边缘排放。在沙洲边缘的排放区同时测量了向上流动和升高的近地表溶解Fe（II）浓度（-0.05 m深度处> 20μMFe（II））。所测得的浓度是以前刺激桃金娘科生长的浓度的四倍以上。这些结果表明，潮汐驱动的交换机制可能能够将溶解的Fe（II）输送到潮间带沙洲内观察到金缕梅开花的地点。虽然铁的来源尚未确定，但仍在讨论潜在的候选人。这些发现对摩顿湾近海潮间带沙洲的洋枣水华开花的当前概念模型具有重要意义。需要进一步研究，以充分了解潮汐驱动的交换在控制现场田间向沿海水域输出生物利用铁的作用。特别是，需要更好地评估孔隙水流动与沿流动路径可能发生的地球化学反应之间的联系。

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