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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Did tillage erosion play a role in millennial scale landscape development?
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Did tillage erosion play a role in millennial scale landscape development?

机译：耕作侵蚀是否在千禧年规模的景观发展中发挥作用？

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摘要

Landscape evolution models (LEMs) quantitatively simulate processes of sedimentation and erosion on millennial timescales. An important aspect of human impact on erosion is sediment redistribution due to agriculture, referred to herein as tillage erosion. In this study we aim to analyse the potential contribution of tillage erosion to landscape development using LEM LAPSUS. The model is calibrated separately for a water erosion process (i) without tillage and (ii) with tillage. The model is applied to the ~250km~2 Torrealvilla case study catchment, SE Spain. We were able to simulate alternating sequences of incision and aggradation, that are important on longer (millennial) timescales. Generally, model results show that tillage erosion adds to deposition in the lower floodplain area, but neither water erosion alone nor water with tillage erosion together could exactly reproduce the observed amounts of erosion and sedimentation for the case study area. In addition, scale effects are apparent. On hillslopes, tillage may contribute importantly to erosion and may fill local depressions. If assessed on the catchment scale, sediments from tillage erosion eventually reach the lower floodplain area where they contribute to deposition. However, water erosion was observed in the model simulations to be the most important process on the catchment scale. This is the first time that tillage erosion has been explicitly included in a landscape evolution model at a millennial timescale and large catchment scale.
机译：景观演化模型（LEM）在千禧年尺度上定量模拟沉积和侵蚀过程。人类对侵蚀的影响的一个重要方面是由于农业造成的沉积物再分配，在本文中称为耕作侵蚀。在这项研究中，我们旨在使用LEM LAPSUS分析耕作侵蚀对景观发展的潜在贡献。针对水蚀过程（i）不耕作和（ii）有耕作分别对模型进行校准。该模型适用于西班牙东南部〜250km〜2 Torrealvilla案例研究流域。我们能够模拟切开和凝结的交替序列，这在更长（千禧年）的时间尺度上很重要。通常，模型结果表明，耕作侵蚀增加了下洪泛区的沉积，但是单独的水蚀和结合耕作侵蚀的水都不能准确地再现案例研究区域所观测到的侵蚀和沉积量。另外，规模效应是显而易见的。在山坡上，耕作可能对侵蚀产生重要影响，并可能填补局部洼地。如果以流域规模进行评估，耕作侵蚀造成的沉积物最终将到达较低的洪泛区，在该处它们有助于沉积。但是，在模型模拟中观察到水蚀是流域规模上最重要的过程。这是第一次在千禧年尺度和大流域尺度上将耕作侵蚀明确纳入景观演化模型。

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