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首页> 外文期刊>Estuarine Coastal and Shelf Science >Grain Size And Depositional Environment As Predictors Of Permeability In Coastal Marine Sands
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Grain Size And Depositional Environment As Predictors Of Permeability In Coastal Marine Sands

机译：粒度和沉积环境是沿海海沙渗透性的预测指标

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More than half of the surface sediments covering the continental shelves are sandy, which may permit substantial sub-seafloor pore water advection. Knowledge of sediment permeability is required for quantifying advection and associated solute transport, but studies of marine sediments typically report grain size analyses rather than permeability. Here data from 23 studies were examined to determine the range in permeabilities reported for sublittoral marine sands and to assess the utility of permeability-grain size relationships in this setting. In the resulting database, the permeability of small (～30cm) undisturbed cores collected from the sea floor all fell between 2 × 10~(-12) and 4 × 10~(-10) m~2, a range where advective transport induced by wave and current action should be pervasive. The range in grain size was very similar for near-shore (<10 m water depth) and continental shelf samples (>10 m water depth), but the permeability of the continental shelf samples was consistently lower for the same median grain size. Empirical permeability-grain size relationships generated a poor fit (r~2 = 0.35) for the aggregate data, but separate relationships for near-shore and continental shelf samples were significantly better, r~2 = 0.66 and 0.77, respectively. Permeability-grain size relationships thus may be useful for sublittoral sands, but a larger database needs to be accumulated before reliable fit parameters and variability can be predicted. Thus it is recommended that permeability be routinely determined when characterizing sedimento-logical properties of marine sand deposits. Concurrent determinations of sediment bulk density and porosity may further improve estimates of permeability.
机译：覆盖大陆架的表层沉积物中有一半以上是沙质的，这可能允许大量的海底孔隙对流。定量平流和相关溶质运移需要了解沉积物的渗透性，但是对海洋沉积物的研究通常报告的是粒度分析而非渗透性。在这里，我们检查了23项研究的数据，以确定沿海近海砂的渗透率范围，并评估在这种情况下渗透率与粒度之间的关系。在结果数据库中，从海床收集的小的（〜30cm）未扰动岩心的渗透率都在2×10〜（-12）和4×10〜（-10）m〜2之间，这是对流输送引起的范围通过波及当前的行动应无处不在。对于近岸（水深<10 m）和大陆架样品（水深> 10 m），粒径范围非常相似，但是对于相同的中值粒径，大陆架样品的渗透率始终较低。经验渗透率与颗粒大小之间的关系对总体数据的拟合度较差（r〜2 = 0.35），但近岸和大陆架样品的单独关系明显更好，r〜2 = 0.66和0.77。因此，渗透率与粒度的关系可能对沿岸砂是有用的，但是在可以预测可靠的拟合参数和可变性之前，需要积累更大的数据库。因此，建议在表征海沙沉积物的沉积学特性时，应常规确定渗透率。同时确定沉积物的堆积密度和孔隙度可能会进一步改善渗透率的估算。

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