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Analysis of the triggering conditions and erosion of a runoff-triggered debris flow in Miyun County, Beijing, China

机译：中国北京宫县径流引发碎片流动触发条件及侵蚀分析

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摘要

The occurrence of debris flow from channel-bed failure is occasionally noted in small and steeply sloping watersheds where channelized water flow dominates debris flow initiation. On August 12, 2016, a debris flow from channel-bed failures occurred in the Caozhuangzi Watershed of the Longtan Basin, Miyun, Beijing. Rainfall records over 10-min intervals and field investigations including channel morphology measurements were used to study the triggering conditions and erosion process. The results indicated that the occurrence of this event lagged the peak 10-min rainfall interval and that the cumulative rainfall prior to the occurrence time played an important role in its formation. A mean 10-min rainfall intensity-duration expression in the form of I (10) = 5.0 x D (-0.21), where I (10) denotes the mean 10-min rainfall intensity and D is the rainfall duration ranging from 10 to 60 h, was proposed. The debris flows have low proportions of grain size fractions 0.1 mm and higher fractions of grains 0.1-2 mm in size, indicating that the flow had low viscosity and was coarse-grain dominated. Channel morphology analysis revealed that abrupt changes in topography in the study area, including a steep section, a concave stream bank area, and a partial concave stream section were eroded more extensively than other sites. The maximum sediment erosion volume and erosion depth were not proportional to the variation in stream gradient. Consideration of the degree of erosion in the channel at sites with abrupt morphology changes, the maximum sediment erosion volume, and the erosion depth and volume at the initial channel site and downstream region of forest area together showed that the prime factor controlling erosion was entrained sediment volume. This work, thus, provides a case study regarding the triggering conditions of runoff-triggered debris flows and the topographical changes by debris flow erosion.
机译：偶尔在通道化水流动偏移碎片流动启动中，偶尔会注意到沟道床失效的碎片流动的发生。 2016年8月12日，北京少年龙潭盆地的Caozhuangzi流域中发生了频道床失败的碎片流动。降雨记录超过10分钟的间隔和现场调查，包括通道形态测量，用于研究触发条件和侵蚀过程。结果表明，该事件的发生滞后于10分钟的降雨间隔，并且在发生时间之前的累积降雨在其形成中起重要作用。一种平均10分钟的降雨强度持续时间表达，I（10）= 5.0×D（-0.21），其中I（10）表示平均10分钟的降雨强度，D是降雨持续时间从10到提出了60小时。碎片流量具有低比例的晶粒尺寸级分＆ 0.1mm，粒径为0.1毫米，尺寸为0.1-2mm，表明流动粘度低，粗晶占主导地位。信道形态学分析显示研究区域中地形的突然变化，包括陡峭部分，凹入流堤坝和部分凹入流部分比其他网站更广泛地侵蚀。最大沉积物侵蚀体积和侵蚀深度与流梯度的变化没有成比例。考虑突然形态变化的频道侵蚀程度，最大沉积物侵蚀体积，以及初始通道站点和森林区域下游区域的侵蚀深度和体积的共同表明，夹带沉积物的主要因素控制腐蚀体积。因此，这项工作提供了关于径流触发的碎片流动的触发条件以及碎片流动侵蚀的地形变化的案例研究。

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  • 来源
    《Landslides》 |2018年第12期|共11页
  • 作者

    Ma Chao; Deng Jiayong; Wang Rui;

  • 作者单位

    Beijing Forestry Univ Jinyun Forest Ecosyst Res Stn Sch Soil &

    Water Conservat Beijing 100083 Peoples R China;

    Beijing Forestry Univ Jinyun Forest Ecosyst Res Stn Sch Soil &

    Water Conservat Beijing 100083 Peoples R China;

    Beijing Forestry Univ Jinyun Forest Ecosyst Res Stn Sch Soil &

    Water Conservat Beijing 100083 Peoples R China;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 崩塌;
  • 关键词

    Debris flow; Runoff-triggered debris flows; Channel-bed failures; Rocky mountain; Beijing;

    机译：碎片流动;径流触发的碎片流动;频道床失败;岩石山;北京;

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