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首页> 外文期刊>Environmental Science & Technology >In-line laser holography and video analysis of eroded floc from engineered and estuarine sediments
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In-line laser holography and video analysis of eroded floc from engineered and estuarine sediments

机译：在线激光全息术和工程和河口沉积物侵蚀絮凝物的视频分析

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Microphytobenthic polymers mediate intertidal sediment erosion processes, through biostabilization and modifying the nature of eroded floc material. The latter is of key importance with respect to sediment transport dynamics, including floc aggregation and particle deposition. In this study, eroded floc material was analyzed by video imaging, alongside novel application of in-line laser holography (ILH). The erosion of engineered sediment was compared to that of natural estuarine sediments. Both video and holography showed an increase in floc size eroded from engineered cohesive clay sediment as a function of sediment dewatering and sediment polymer content. Estuarine sediment showed a curvilinear increase in floc size as a function of both microphytobenthic biomass and sediment colloidal polymer content when measured by video analysis. Holography did not show these functions for floc size due to temporal limitations of the current ILH methodology. An interaction of sediment polymer binding and sediment desiccation was observed for engineered sediments and, most notably, for estuarine cohesive sediments. In conclusion, engineered sediments were not accurate analogues for natural intertidal sediments, failing to reproduce eroded floc material similar to that from estuarine cohesive sediment. The size of eroded floc from estuarine sediments is a function of the complex interaction between biological and physicochemical processes, primarily algal colloidal polymer and desiccation. Holography demonstrated an excellent potential for the high-resolution imaging of eroded material but is limited by temporal constraints; the solution to this would be the development of real-time holographic video.
机译：藻类底栖生物通过生物稳定作用和改变被侵蚀的絮凝物的性质来调节潮间带沉积物的侵蚀过程。后者对于包括絮凝物聚集和颗粒沉积在内的沉积物传输动力学至关重要。在这项研究中，通过视频成像以及在线激光全息术（ILH）的新颖应用，对侵蚀的絮凝物进行了分析。将工程沉积物的侵蚀与天然河口沉积物的侵蚀进行了比较。视频和全息图均显示，工程粘性黏土沉积物侵蚀的絮凝物大小随沉积物脱水和沉积物聚合物含量的增加而增加。当通过视频分析进行测量时，河口沉积物的絮凝物大小呈曲线增加，这是微底栖生物量和沉积物胶体聚合物含量的函数。由于当前ILH方法的时间限制，全息图没有显示出絮体大小的这些功能。对于工程化的沉积物，尤其是河口粘性沉积物，观察到了沉积物聚合物结合和沉积物干燥的相互作用。总之，工程沉积物不是天然潮间带沉积物的精确类似物，无法再现与河口粘性沉积物相似的侵蚀絮凝物。河口沉积物侵蚀的絮凝物的大小是生物学和物理化学过程（主要是藻类胶体聚合物和干燥过程）之间复杂相互作用的函数。全息照相术显示出对侵蚀材料进行高分辨率成像的巨大潜力，但受到时间限制。解决方案将是开发实时全息视频。

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