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Parametric study of fluidization conditions of bed sediments in the hyporheic zone
Hydrological Processes ( IF 2.8 ) Pub Date : 2022-07-26 , DOI: 10.1002/hyp.14650 Marek Marciniak 1 , Mariusz Kaczmarek 2 , Magdalena Matusiak 1 , Anna Szczucińska 1
Hydrological Processes ( IF 2.8 ) Pub Date : 2022-07-26 , DOI: 10.1002/hyp.14650 Marek Marciniak 1 , Mariusz Kaczmarek 2 , Magdalena Matusiak 1 , Anna Szczucińska 1
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The phenomenon of fluidization of the bed sediment of the hyporheic zone involves the production of dynamic suspension of solid particles in a stream of water flowing in the direction opposite to gravity. Fluidization may be permanent; then, it becomes a spring or a headwater zone, where groundwater discharge rate is almost unchanged within an entire hydrological year. But it can also occur periodically, depending on the changing hydrodynamic conditions. In such cases, the fluidization of the bed sediment of the hyporheic zone may disturb its functioning by changing the conditions of surface water and groundwater exchange. The disturbances affect hydrodynamic and hydrochemical processes connected with water exchange, but first of all, the living conditions of hyporheic zone flora and fauna. Therefore, the phenomenon of fluidization is significant for broadly understood ecology of the hyporheic zone. The paper presents the analysis of conditions of fluidization occurrence depending on the main hydrodynamic parameters that may affect this process. The authors analysed the influence of the difference in water level between the drained aquifer and the river, the hydraulic conductivity and anisotropy of the aquifer, the vertical hydraulic conductivity in the hyporheic zone, thickness of the hyporheic zone, and the width of the river on the possibility of fluidization of the bed sediment of the hyporheic zone. The range of variability of particular parameters corresponds to the actual variability of those parameters in natural conditions. It was proved that the fluidization of the bed sediment of the hyporheic zone mostly depends on: water level difference, hydraulic conductivity of the aquifer, and value of vertical hydraulic conductivity in the hyporheic zone. The other parameters have little influence on this process.
中文翻译：
次流带区床层沉积物流化条件的参数化研究
次流带床沉积物的流化现象涉及固体颗粒在以与重力相反的方向流动的水流中的动态悬浮的产生。流化可能是永久性的；然后，它变成一个泉水或源头带，地下水排放率在整个水文年内几乎没有变化。但它也可以周期性地发生，这取决于不断变化的水动力条件。在这种情况下，次流带床底沉积物的流化可能会通过改变地表水和地下水交换条件来干扰其功能。这些干扰影响与水交换相关的水动力和水化学过程，但首先影响的是低流带动植物的生活条件。所以，流化现象对于广泛理解的海流带生态具有重要意义。本文介绍了流化发生条件的分析，具体取决于可能影响该过程的主要流体动力学参数。分析了排水含水层与河流的水位差、含水层的导水率和各向异性、次流带的垂直导水率、次流带的厚度、河流的宽度等对河流的影响。次流带床沉积物流化的可能性。特定参数的可变性范围对应于这些参数在自然条件下的实际可变性。实践证明，次流带床底沉积物的流化作用主要取决于：水位差、含水层的导水率和次流带的垂直导水率值。其他参数对这个过程影响不大。
更新日期：2022-07-26
中文翻译：
次流带区床层沉积物流化条件的参数化研究
次流带床沉积物的流化现象涉及固体颗粒在以与重力相反的方向流动的水流中的动态悬浮的产生。流化可能是永久性的；然后，它变成一个泉水或源头带，地下水排放率在整个水文年内几乎没有变化。但它也可以周期性地发生，这取决于不断变化的水动力条件。在这种情况下，次流带床底沉积物的流化可能会通过改变地表水和地下水交换条件来干扰其功能。这些干扰影响与水交换相关的水动力和水化学过程，但首先影响的是低流带动植物的生活条件。所以，流化现象对于广泛理解的海流带生态具有重要意义。本文介绍了流化发生条件的分析，具体取决于可能影响该过程的主要流体动力学参数。分析了排水含水层与河流的水位差、含水层的导水率和各向异性、次流带的垂直导水率、次流带的厚度、河流的宽度等对河流的影响。次流带床沉积物流化的可能性。特定参数的可变性范围对应于这些参数在自然条件下的实际可变性。实践证明，次流带床底沉积物的流化作用主要取决于：水位差、含水层的导水率和次流带的垂直导水率值。其他参数对这个过程影响不大。
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