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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >The effect of accelerated soil erosion on hillslope morphology
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The effect of accelerated soil erosion on hillslope morphology

机译：加速土壤侵蚀对山坡形态的影响

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摘要

Intensive agricultural land use can have detrimental effects on landscape properties, greatly accelerating soil erosion, with consequent fertility loss and reduced agricultural potential. To quantify the effects of such erosional processes on hillslope morphology and gain insight into the underlying dynamics, we use a twofold approach. First, a statistical analysis of topographical features is conducted, with a focus on slope and gradient distributions. The accelerated soil erosion is shown to be fingerprinted in the distribution tails, which provide a clear statistical signature of this human-induced land modification. Theoretical solutions are then derived for the hillslope morphology and the associated creep and runoff erosion fluxes, allowing us to distinguish between the main erosional mechanisms operating in disturbed and undisturbed areas. We focus our application on the landscape at the Calhoun Critical Zone Observatory in the US Southern Piedmont, where severe soil erosion followed intensive cotton cultivation, resulting in highly eroded and gullied hillslopes. The observed differences in hillslope morphologies in disturbed and undisturbed areas are shown to be related to the disruption of the natural balance between soil creep and runoff erosion. The relaxation time required for the disturbed hillslopes to reach a quasi-equilibrium condition is also investigated. (c) 2019 John Wiley & Sons, Ltd.
机译：密集的农业用地对景观特性有不利影响，大大加速土壤侵蚀，随后的生育损失和降低农业潜力。为了量化这些侵蚀过程对山坡形态的影响，并进入潜在动态的洞察力，我们使用双重方法。首先，进行地形特征的统计分析，专注于坡度和梯度分布。加速土壤侵蚀显示在分布尾部的指纹纹理，其提供这种人类诱导的土地改性的明确统计签名。然后导出理论溶液，用于山坡形态和相关的蠕变和径流侵蚀助焊剂，使我们能够区分在干扰和未受干扰的区域操作的主要侵蚀机制。我们将我们在美国南部皮埃蒙特的Calhoun关键区天文台的景观中的应用，严重的土壤侵蚀遵循密集的棉质种植，导致高度侵蚀和羽毛的山坡。观察到在干扰和未受干扰地区的山坡形态的观察到差异与土壤蠕变与径流侵蚀之间的自然平衡中断有关。还研究了受扰动的山坡所需的放松时间来达到准平衡条件。 （c）2019 John Wiley＆Sons，Ltd。

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