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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Variable hillslope-channel coupling and channel characteristics of forested mountain streams in glaciated landscapes
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Variable hillslope-channel coupling and channel characteristics of forested mountain streams in glaciated landscapes

机译：冰川景观中森林山地溪流的可变山坡频道耦合和渠道特征

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Channel morphology of forested, mountain streams in glaciated landscapes is regulated by a complex suite of processes, and remains difficult to predict. Here, we analyze models of channel geometry against a comprehensive field dataset collected in two previously glaciated basins in Haida Gwaii, B.C., to explore the influence of variable hillslope-channel coupling imposed by the glacial legacy on channel form. Our objective is to better understand the relation between hillslope-channel coupling and stream character within glaciated basins. We find that the glacial legacy on landscape structure is characterized by relatively large spatial variation in hillslope-channel coupling. Spatial differences in coupling influence the frequency and magnitude of coarse sediment and woody material delivery to the channel network. Analyses using a model for channel gradient and multiple models for width and depth show that hillslope-channel coupling and high wood loading induce deviations from standard downstream predictions for all three variables in the study basins. Examination of model residuals using Boosted Regression Trees and nine additional channel variables indicates that similar to 10 to similar to 40% of residual variance can be explained by logjam variables, similar to 15-40% by the degree of hillslope-channel coupling, and 10-20% by proximity to slope failures. These results indicate that channel classification systems incorporating hillslope-channel coupling, and, indirectly, the catchment glacial legacy, may present a more complete understanding of mountain channels. From these results, we propose a conceptual framework which describes the linkages between landscape history, hillslope-channel coupling, and channel form. (c) 2018 John Wiley & Sons, Ltd.
机译：森林的渠道形态，冰川景观中的山地溪流受到复杂的过程套件，并难以预测。在这里，我们分析了频道几何图形模型，该模型对Haida Gwaii，B.C的两个先前冰川盆地收集的综合现场数据集，以探讨通过冰川遗留对沟道形式施加的可变山坡通道耦合的影响。我们的目标是更好地了解山坡沟渠耦合和冰水盆内流字符之间的关系。我们发现景观结构的冰川遗产是山坡通道耦合中相对较大的空间变化。耦合的空间差异影响粗沉积物和木质材料输送到通道网络的频率和大小。使用频道梯度模型和多种宽度和深度模型的分析表明，山坡通道耦合和高木材加载诱导研究盆中所有三个变量的标准下游预测的偏差。使用提升回归树的模型残差检验和九个附加频道变量表示类似于10〜类似于40％的剩余方差，可以通过Logjam变量来解释，与山坡通道耦合程度的15-40％相似，10斜坡故障靠近-20％。这些结果表明，包括Hillslope频道耦合的信道分类系统，以及间接冰川遗留，可能会更完全了解山渠道。根据这些结果，我们提出了一个概念框架，该概念框架描述了景观历史，山坡通道耦合和沟道形式之间的联系。 （c）2018 John Wiley＆Sons，Ltd。

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