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首页> 外文期刊>Geophysical Research Letters >Influence of morphology and permafrost dynamics on hyporheic exchange in arctic headwater streams under warming climate conditions
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Influence of morphology and permafrost dynamics on hyporheic exchange in arctic headwater streams under warming climate conditions

机译：气候变暖条件下北极上游水流的形态和多年冻土动力学对流变交换的影响

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摘要

We investigated surface-subsurface (hyporheic) exchange in two morphologically distinct arctic headwater streams experiencing warming (thawing) sub-channel conditions. Empirically parameterized and calibrated groundwater flow models were used to assess the influence of sub-channel thaw on hyporheic exchange. Average thaw depths were at least two-fold greater under the higher-energy, alluvial stream than under the low-energy, peat-lined stream. Alluvial hyporheic exchange had shorter residence times and longer flowpaths that occurred across greater portions of the thawed sediments. For both reaches, the morphologic (longitudinal bed topography) and hydraulic conditions (surface and groundwater flow properties) set the potential for hyporheic flow. Simulations of deeper thaw, as predicted under a warming arctic climate, only influence hyporheic exchange until a threshold depth. This depth is primarily determined by the hydraulic head gradients imposed by the stream morphology. Therefore, arctic hyporheic exchange extent is likely to be independent of greater sub-stream thaw depths.
机译：我们研究了经历变暖（融化）子通道条件的两种形态截然不同的北极源头水流中的地表下（疏水）交换。使用经验参数化和校准的地下水流模型来评估子通道解冻对低渗交换的影响。在高能冲积流下，平均解冻深度至少是低能，泥炭衬里下的解冻深度的两倍。冲积性流变交换具有较短的停留时间和较长的流路，流经较大部分的融化沉积物。对于这两个河段，形态（纵向河床地形）和水力条件（地表水和地下水的流动特性）都设置了流变的可能性。如在北极变暖的气候下预测的，更深的融化模拟仅影响流变交换，直到达到阈值深度为止。该深度主要由水流形态施加的水力压头梯度确定。因此，北极流变交换程度很可能与更大的子流解冻深度无关。

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