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首页> 外文期刊>Aquatic Sciences >Understanding streambeds as complex systems: review of multiple interacting environmental processes influencing streambed permeability
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Understanding streambeds as complex systems: review of multiple interacting environmental processes influencing streambed permeability

机译：了解流汇流作为复杂系统：审查影响流渗透率的多个互动环境过程

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The permeability of sediments at the sediment-water interface is an important control on several stream ecosystem services. It is well known that streambed permeability varies over several orders of magnitude, however, the environmental processes influencing this variation have received little attention. This review synthesizes the state-of-art knowledge and gaps in our understanding of the key physical and biological processes which can potentially modify the streambed permeability. These processes include-(a) physical clogging due to fine sediments, (b) biological clogging due to microbial biomass, and (c) sediment reworking by in-stream fauna. We highlight that the role of biotic processes (bioclogging and sediment reworking processes) in modifying the streambed permeability has not been investigated in detail. We emphasize that complex feedback mechanisms exist between these abiotic and biotic processes, and an interdisciplinary framework is necessary to achieve a holistic understanding of the spatio-temporal variability in streambed permeability. To this end, we propose to develop a conceptual model for streambed evolution after a disturbance (e.g. floods) as this model could be valuable in comprehending the dynamics of permeability. We also outline the challenges associated with developing a widely applicable streambed evolution model. Nonetheless, as a way forward, we present a possible scenario for the evolution of a streambed following a high flow event based on the trajectory of responses of the above-mentioned environmental processes. Finally, we suggest future research directions that could assist in improving the fundamental understanding of the clogging and sediment reworking processes and consequently of the dynamics of streambed permeability.
机译：沉积物 - 水界面沉积物的渗透性是几个流生态系统服务的重要控制。众所周知，流渗透率在几个数量级上变化，然而，影响这种变异的环境过程很少受到关注。本次审查综合了了解最先进的知识和差距，了解可能会潜在地改变流渗透性的关键身体和生物学过程。这些方法包括 - （a）由于微生物生物量引起的细沉积物（b）生物堵塞，（c）沉积物通过在溪流的沉积物上进行物理堵塞。我们强调，生物过程（生物钻研和沉积物的工艺）在改变流渗透率方面的作用尚未详细研究。我们强调这些非生物和生物过程之间存在复杂的反馈机制，并且有必要在跨学科框架之间实现全面了解流渗透性的时空变异性。为此，我们建议在干扰（例如洪水）后开发血流演变的概念模型，因为这种模型可能是理解渗透性的动态。我们还概述了与开发广泛适用的流媒体演进模型相关的挑战。尽管如此，作为一种前进的方式，我们在基于上述环境过程的响应轨迹之后的高流动事件之后的流动的演变可能的场景。最后，我们建议未来的研究方向，可以帮助改善对堵塞和沉积物的基本理解，并因此有助于流动渗透性的动态。

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