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首页> 外文期刊>Remote Sensing >Monitoring Earthquake-Damaged Vegetation after the 2008 Wenchuan Earthquake in the Mountainous River Basins, Dujiangyan County
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Monitoring Earthquake-Damaged Vegetation after the 2008 Wenchuan Earthquake in the Mountainous River Basins, Dujiangyan County

机译：都江堰县2008年汶川地震后山地流域地震灾后植被监测

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摘要

The 2008 Wenchuan earthquake destroyed large areas of vegetation in the Baisha River and Longxi River basins, in Dujiangyan County, China. There were several debris flow events in these mountainous river basins after 2008. Currently, these damaged vegetation areas are in various stages of recovery. This recovery vegetation improves the resistance of slopes to both surficial erosion and mass wasting. We introduce a probabilistic approach to determining the relationships between damaged vegetation and slope materials’ stability, and model the sediment and flow (hydrological) connectivity index to detect the hydrological changes in a given river basin, using the multi-temporal (1994‒2014) remote-sensing images to monitor the vegetation recovery processes. Our results demonstrated that the earthquake-damaged vegetation areas have coupling relationships with topographic environment and slope material properties, and can be used to assess the slope material stability. Further, our analysis results showed that the areas with horizontal distance to river streams 500 m are areas that actively contribute sediment to the stream channel network, and are main material sources for debris flow processes in one given mountainous basin.
机译：2008年汶川地震摧毁了都江堰县白沙河和Long溪流域的大片植被。 2008年之后，这些山区河流流域发生了数次泥石流事件。目前，这些受损的植被地区正处于恢复的不同阶段。植被的恢复提高了斜坡对表面侵蚀和大量浪费的抵抗力。我们引入一种概率方法来确定受损植被与边坡材料的稳定性之间的关系，并使用多时相（1994-2014年）对沉积物和流（水文）连通性指数进行建模，以检测给定流域的水文变化。遥感图像来监测植被恢复过程。我们的结果表明，地震破坏的植被区域与地形环境和边坡材料特性具有耦合关系，可用于评估边坡材料的稳定性。此外，我们的分析结果表明，与河流水平距离小于500 m的区域是活跃地为河道网络贡献沉积物的区域，并且是某一给定山区盆地泥石流过程的主要物质来源。

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