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Reconstructing spatio-temporal patterns of debris-flow activity using dendrogeomorphological methods

机译：利用树状地貌方法重建泥石流活动的时空格局

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Debris flows are a major threat in many parts of the Alps, where they repeatedly cause severe damage to infrastructure and transportation corridors or even loss of life. Nonetheless, the spatial behavior of past debris-flow activity and the analysis of areas affected during particular events have been widely neglected in reconstructions so far. It was therefore the purpose of this study to reconstruct spatio-temporal patterns of past debris flows on a forested cone in the Swiss Alps (Bruchji torrent, Blatten, Valais). The analysis of past events was based on a detailed geomorphic map (1:1000) of all forms related to debris flows as well as on tree-ring series from 401 heavily affected trees (Larix decidua Mill. and Picea abies (L.) Karst.) growing in or next to deposits. The samples were analyzed and growth disturbances related to debris-flow activity assessed, such as tangential rows of traumatic resin ducts, the onset of reaction wood or abrupt growth suppression or release. In total, 960 growth disturbances were identified in the samples, belonging to 40 different event years between A.D. 1867 and 2005. In addition, the coupling of tree-ring data with the geomorphic map allowed reconstruction of eleven formerly active channels and spatial representation of individual events. Based on our results we believe that before 1935, debris flows preferentially used those channels located in the western part of the cone, whereas the eastern part of the cone remained widely unaffected. The spatial representation of the 40 events also allowed identification of five different spatial patterns for debris flows at the study site.
机译：在阿尔卑斯山的许多地方，泥石流是一个重大威胁，它们反复对基础设施和运输走廊造成严重破坏，甚至造成生命损失。但是，迄今为止，泥石流活动的空间行为以及在特定事件中受影响区域的分析在重建中一直被广泛忽略。因此，本研究的目的是在瑞士阿尔卑斯山（Bruchji洪流，布拉滕，瓦莱州）的一个密林圆锥上重建过去泥石流的时空分布。对过去事件的分析基于与泥石流有关的所有形式的详细地貌图（1：1000）以及来自401株受灾严重的树木（Larix decidua Mill。和Picea abies（L.）Karst）的树轮系列。 。）生长在存款中或存款附近。分析了样品并评估了与泥石流活动相关的生长干扰，例如外伤性树脂导管的切向排，反应木的发作或突然的生长抑制或释放。总共发现了960种生长扰动，属于公元1867年至2005年之间的40个不同事件年份。此外，树木年轮数据与地貌图的耦合允许重建11个先前活动的通道和个体的空间表示事件。根据我们的研究结果，我们认为，在1935年之前，泥石流优先使用位于圆锥体西部的通道，而圆锥体东部仍未受到广泛影响。 40个事件的空间表示形式还可以识别研究地点泥石流的五个不同空间模式。

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