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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Mapping rainstorm erosion associated with an individual storm from InSAR coherence loss validated by field evidence for the Atacama Desert
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Mapping rainstorm erosion associated with an individual storm from InSAR coherence loss validated by field evidence for the Atacama Desert

机译：映射与Atacama Destray的现场证据验证的令人透断的单个风暴相关的暴雨侵蚀

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Extreme high-magnitude and low-frequency storm events in arid zones provide the necessary runoff to entrain sediments from source areas and therefore dictate the linkages between hillslopes and channels. Nevertheless, the erosive impact of large storms remains difficult to predict. Most of the uncertainty lies in the lack of topographic change maps associated with single hydro-meteorological events. Consequently, event-based erosion models are poorly constrained and their extrapolation over long time periods remains uncertain. In this study, a 15-month Sentinel-1A coherence time series, optical and field data are used to map the spatial patterns of erosion after the 5-day storm occurred on March 2015, in the Atacama Desert. The coherence change detection (CCD) analysis suggests that temporal loss of coherence is related to variations in soil moisture, while permanent loss of coherence is related to modification of soil texture by erosion and sedimentation. Importantly, permanent loss of coherence is more apparent on gentle rather than steeper slopes, likely reflecting differences in regolith cover and thickness. These findings can contradict the landscape models predicting higher erosion on steeper hillslopes. The CCD technique represents a promising tool for analysing and modelling sediment connectivity in arid areas, giving a clear picture of the relation between sediment sources and sink pathways. (c) 2020 John Wiley & Sons, Ltd.
机译：干旱地区的极端高度和低频风暴事件提供了必要的径流，以从源区捕获沉积物，因此决定了山坡和渠道之间的联系。然而，大风暴的侵蚀影响仍然难以预测。大多数不确定性都在于缺乏与单个水流气象事件相关的地形变化图。因此，基于事件的侵蚀模型受到严格的约束，并且它们在长期时间内的外推仍然不确定。在这项研究中，15个月的Sentinel-1A相干时间序列，光学和现场数据用于在2015年3月发生在Atacama Desert，在5天暴风雨之后映射侵蚀的空间模式。相干变化检测（CCD）分析表明，时间丧失连贯性与土壤水分的变异有关，而永久性的连贯性丧失与通过腐蚀和沉降的土壤质地的改变有关。重要的是，温柔而不是陡峭的斜坡上的永久性丧失更加明显，可能反映了极岩覆盖和厚度的差异。这些发现可以与预测陡峭的山坡上更高的侵蚀的景观模型相矛盾。 CCD技术代表了一个有前途的工具，用于分析和建模干旱地区的沉积物连接，阐明了沉积物来源和水槽通路之间的关系。 （c）2020 John Wiley＆Sons，Ltd。

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