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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Source of error and uncertainty in sheet erosion rates estimated from dendrogeomorphology
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Source of error and uncertainty in sheet erosion rates estimated from dendrogeomorphology

机译：根据树状地貌估计的片材侵蚀速率的误差和不确定性来源

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摘要

Dendrogeomorphology has been used since the 1960s to estimate sheet erosion rates. To date, most efforts have focused on accurately determining the first year of root exposure. However, an adequate methodological approach that takes into consideration the microtopography of the ground surface when estimating sheet erosion rates using dendrogeomorphology has not been proposed. In this study, terrestrial laser scanning (TLS) was used for the first time to examine how changes in microtopography determine the level of certainty in estimates. To this end, highly accurate TLS-based digital elevation models representing exposed roots and their immediate vicinity were analysed using geographic information system tools. The results indicate that erosion rates calculated using the standard dendrogeomorphic method have been underestimated by up to 29% because the method does not take into account changes to the microtopography caused by the axial and radial pressure of the roots. Another source of uncertainty, which we estimate to be 50%, was also found and is the result of changes in the ground surface microtopography caused by variations in soil roughness. These findings do not invalidate the usefulness of dendrogeomorphology for assessing soil erosion, although they do show the need for correct characterization of the microtopography to guarantee reliability. Copyright (c) 2015 John Wiley & Sons, Ltd.
机译：自1960年代以来，一直使用树突形态学来估计薄板侵蚀速率。迄今为止，大多数工作都集中在准确确定根系接触的第一年。然而，还没有提出一种适当的方法学方法，该方法在使用树突状地貌学估算地表侵蚀速率时考虑了地面的微观形貌。在这项研究中，首次使用地面激光扫描（TLS）来检查微形貌的变化如何确定估计的确定性水平。为此，使用地理信息系统工具分析了基于TLS的高精度数字高程模型，这些模型表示暴露的根及其附近。结果表明，使用标准树状地貌方法计算的侵蚀率被低估了29％，因为该方法没有考虑到根部的轴向和径向压力对微观形貌的影响。还发现了另一个不确定性来源，我们估计是50％，这是土壤粗糙度变化引起的地面微观形貌变化的结果。这些发现并没有使树突状地貌学用于评估土壤侵蚀的有效性，尽管它们确实表明需要正确表征微形貌以保证可靠性。版权所有（c）2015 John Wiley＆Sons，Ltd.

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