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首页> 外文期刊>Advances in limnology >Intrusion of suspended sediments into gravel; riverbeds: influence of bed topography studied by means of field and laboratory experiments
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Intrusion of suspended sediments into gravel; riverbeds: influence of bed topography studied by means of field and laboratory experiments

机译：悬浮的沉积物侵入砾石中;河床：通过野外和实验室实验研究河床地形的影响

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Our study focused on the conditions at the interface between surface water and interstitial pore water. A key factor in determining the amount of exchange, permeability, and its temporal variability is the intrusion of fines into the gravel matrix. The results show that the permeability calculated from grain size distributions leads to an overestimation for poorly sorted alluvial gravel bed sediments. Small spatial or temporal variation of bed prop- ,erties, which are not visible in the analyses of grain sizes or porosities, can have a significant influence on permeability. Flume experiments showed that in a flat bed, impermeable pots collected between 58 and 81 % of the mass when compared with permeable pots. Therefore, intrusion rates need to be relat-ed to the size (and geometry) of the pots whereas the parameter for size has to be chosen carefullye-d pending on the bed- and infiltrated material. Intrusion rates of fines into the substratum were highest in a downwelling zone at the upstream side of a riffle (154 g ITI~(-2) d-') compared to the riffle crest (141g m~(-2) d~(-1)) and the upwelling area at the downstream side of the riffle (121 g m~(-2) d~(-1) ). Subsurface flow ; within the hyporheic zone, induced by large-scale groundwater conditions and/or pool-riffle morphological structures, was identified as a major influence on the patterns of intrusion.
机译：我们的研究集中在地表水和孔隙孔隙水之间的界面条件。决定交换量，渗透率及其随时间变化的关键因素是细屑侵入砾石基质。结果表明，由粒度分布计算出的渗透率导致对冲积砾石床沉积物分类不良的高估。床层属性的时空变化很小，这在晶粒度或孔隙度的分析中是不可见的，这可能会对渗透率产生重大影响。水槽实验表明，在平板床上，与可渗透花盆相比，不可渗透花盆的质量介于58％至81％之间。因此，入侵速度需要与锅的尺寸（和几何形状）相关，而尺寸参数必须仔细选择，取决于床和渗透材料。与浅滩波峰（141g m〜（-2）d〜（-）相比，在浅滩上游侧的下降区（154 g ITI〜（-2）d-'），细粉侵入基底的速率最高。 1））和浅滩下游侧的上升流区域（121 gm〜（-2）d〜（-1））。地下流;大型地下水条件和/或水池浅滩形态结构引起的流变带中的岩浆被认为是对入侵模式的主要影响。

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