Preliminary Analysis Of The Impact Of Forest Cover On Landslide Triggered By Torrential Rainfall
Preliminary Analysis Of The Impact Of Forest Cover On Landslide Triggered By Torrential Rainfall
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发表时间：
2006
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通讯作者：
Zhu Xing-qiu
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作者：
Zhu Xing-qiu
基于遥感、地形、地面观测等资料，以江西省为例，研究了暴雨引发的森林覆盖、生物数量和滑坡的空间分布特征。讨论了不同植被类型对降水的截留量。揭示了森林覆盖对滑坡的影响，得出山体滑坡可发生在中下山区不同植被覆盖区域和不同生物量分布区。森林覆盖对降水的拦截作用可以缓解坡面冲水，但当降水强度大于50mm / d时，拦截率会明显降低。在相同的地质环境下，稀疏的森林覆盖区域容易发生滑坡，但当降雨量接近诱发滑坡的临界值时，坡体上植被的权重函数会加强滑坡事件的发生。森林覆盖对滑坡的影响是由降水强度决定的。植被密集地区触发滑坡的降水阈值要高于植被稀疏地区。
Based on data from remote sensing,topography,ground observation and etc.,choosing Jiangxi as cases,the spatial distribution of forest cover,biological amount and landslides triggered by torrential rainfall are studied.The interception amount of different vegetation types to precipitation is discussed.The impact of forest cover on landslide is revealed,with conclusion that landslides can take place in different vegetation cover regions and various biological amount distribution areas in middle and lower mountainous.The interception action of forest cover to precipitation can mitigate the water rushing on slope,but if the precipitation intensity is over 50mm a day,the interception rate may reduce visibly.At the same geological environment,the landslide is easy to happen in sparse forest cover area,but the weight function of vegetation on slope body will strength the landslide events occurring when rainfall amount approaching critical value that will induce landslide.The impact of forest cover on landslide is decided by precipitation intensity.The precipitation threshold value that will trigger landslide is higher in dense vegetation areas than in sparse regions.