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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Landslides and increased debris-flow activity: A systematic comparison of six catchments in Switzerland
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Landslides and increased debris-flow activity: A systematic comparison of six catchments in Switzerland

机译：山体滑坡和增加的泥石流活动：瑞士六集水区的系统比较

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An increase in debris-flow frequency is expected in steep Alpine catchments after the occurrence of a large landslide, such as a rock avalanche. Herein we describe changes in debris-flow activity following increases in sediment availability due to landslides, or accelerated rock-glacier movement, for five catchments in the Swiss Alps, the Spreitgraben, Schipfenbach, Bondasca, Riascio, and Dorfbach catchments. Documentation on debris-flow activity is available from both before and after the landslide that generated the new sediment deposits. Data from nearby meteorological stations were used to explore possible changes in rainfall activity, and how the intensity and duration of rainfall events may have changed. In all cases there was a considerable increase in debris-flows frequency for one to eight years following the landslide. The annual number of days with debris-flow activity following the landslide was similar to that observed for the Illgraben catchment, where many such landslides occur annually. No clear change in precipitation totals preceding debris flows was apparent for the Riascio catchment, suggesting that the increase in frequency of debris flows is related to the increase in the amount of sediment that can be readily mobilized. In the two cases where rainfall data were available on an hourly basis, no systematic changes in the intensity or duration of rainfall related to debris-flow triggering were apparent, as shown by the close-clustering of storms on the intensity-duration plots. Following the sediment-generating event, an initial and sudden increase of the sediment yield was observed, followed by a decrease over time towards pre-disturbance values. The response of the catchments appears to be related to the amount of debris-flow activity prior to the landslide: sediment yield from catchments with frequent debris flows prior to the landslide activity did not increase as dramatically as in catchments where debris-flow activity was less common prior
机译：在发生大型滑坡之后的陡峭的高山集水区内，预计碎片流动频率增加，例如岩石雪崩。在此，我们描述了由于山体滑坡，或加速岩石冰川运动，在瑞士阿尔卑斯山，Spreitgraben，Schipfenbach，Bondasca，Riadoio和Dorfbach集水区中增加了沉积物可用性的增加，或加速岩石冰川运动，或加速岩石冰川运动的变化。在产生新的沉积物沉积物的滑坡前后，可以获得关于碎屑 - 流动活动的文档。来自附近的气象站的数据用于探讨降雨活动的可能变化，以及降雨事件的强度和持续时间可能发生变化。在所有情况下，滑坡后一到八年的碎片流动频率相当大增加。山体滑坡后碎片流动活动的年天数量类似于为Illgraben集水区观察到的天数，其中许多这种山体滑坡每年发生。对于碎片流量的降水总量没有明确的降水量，这对于RiaScio集水区显而易见的是，碎片流动频率的增加与可以容易动集的沉积物量的增加。在每小时可获得降雨数据的两种情况下，与碎屑流动触发有关的降雨强度或持续时间的系统变化显而易见，如暴风雨在强度持续时间图上所示。在沉积物产生事件之后，观察到沉积物产量的初始和突然增加，然后朝着预干扰值减少时间。该流域的响应似乎与滑坡前的碎屑活性的量有关：在滑坡活动前的频繁碎片流动的沉积物产量没有像碎片流动活性较少的流域一样大幅增加共同之前

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