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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Landscape 'stress' and reorganization from chi-maps: Insights from experimental drainage networks in oblique collision setting
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Landscape 'stress' and reorganization from chi-maps: Insights from experimental drainage networks in oblique collision setting

机译：Chi-Maps的景观“压力”和重组：倾斜碰撞设置实验排水网络的见解

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Several recent studies have suggested that maps of flow length normalized for drainage area called chi (chi) could reveal landscapes in a transient state, which are prone to reorganizations of basin geometry, flow line topology and water divide locations. However, the potentially long timescales associated with the evolution of basin geometry make the capability of chi to predict such reorganization challenging to test in natural settings. Here, we investigate the evolution of experimental drainage networks developed on a wedge coupled to a piedmont and growing in oblique convergence. We use this experimental setting to investigate the relationships between chi maps, the imposed tectonic deformation and the drainage network evolution. As deposition can occur within channels or in the piedmont, our experimental streams deviate from purely bedrock channels for which the chi metric has been initially developed. Yet we show that the large-scale chi pattern of the experimental drainage network is consistent with the imposed deformation field, as similar to 2/3 of the observed chi gradients across water divide are oriented in the expected direction with respect to the imposed deformation. This suggests that chi maps can be used to infer the horizontal component of regional deformation in large-scale natural mountainous fluvial landscapes. In addition, we observe that when a divide affected by a chi gradient migrates, the orientation of the gradient correctly anticipates the sense of landscape reorganization for similar to 2/3 of these divides. (c) 2018 John Wiley & Sons, Ltd.
机译：最近的几项研究表明，用于排水面积的流量长度映射，称为CHI（CHI）可以揭示瞬态状态的景观，其易于重组盆地几何形状，流线拓扑和水分分部的重组。然而，与盆地几何的演变相关的潜在长时间，使得CHI能力预测在自然环境中进行测试的这种重组挑战。在这里，我们研究了在楔形的实验排水网络的演变，其楔形到皮埃蒙特并在倾斜融合中生长。我们使用这种实验环境来研究CHI地图之间的关系，强加的构造变形和排水网络演化。由于沉积可以发生在通道内或皮埃蒙特内，我们的实验流偏离纯粹的基岩通道，其中最初已经开发了CHI度量。然而，我们表明，实验排水网络的大规模CHI模式与施加的变形场一致，与相对于施加的变形相对于施加的变形，相似的观察到的CHI梯度的2/3。这表明Chi Maps可用于推断大规模自然山地河流景观中区域变形的水平分量。此外，我们观察到，当受Chi梯度迁移影响的划分时，梯度的取向正确地预测了与这些分裂中的2/3类似的景观重组感。 （c）2018 John Wiley＆Sons，Ltd。

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