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首页> 外文期刊>Earth Surface Processes and Landforms: The journal of the British Geomorphological Research Group >Impact of an 0.2 km(3) Rock Avalanche on Lake Eibsee (Bavarian Alps, Germany) - Part I: Reconstruction of the paleolake and Effects of the Impact
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Impact of an 0.2 km(3) Rock Avalanche on Lake Eibsee (Bavarian Alps, Germany) - Part I: Reconstruction of the paleolake and Effects of the Impact

机译：0.2公里（3）岩雪崩在Eibsee湖（巴伐利亚阿尔卑斯山，德国）的影响 - 第一部分：重建苍白和影响的影响

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Rock avalanches destroy and reshape landscapes in only a few minutes and are among the most hazardous processes on Earth. The surface morphology of rock avalanche deposits and the interaction with the underlying material are crucial for runout properties and reach. Water within the travel path is displaced, producing large impact waves and reducing friction, leading to long runouts. We hypothesize that the 0.2 km(3) Holocene Eibsee rock avalanche from Mount Zugspitze in the Bavarian Alps overran and destroyed Paleolake Eibsee and left a unique sedimentological legacy of processes active during the landslide. We captured 9.5 km of electrical resistivity tomography (ERT) profiles across the rock avalanche deposits, with up to 120 m penetration depth and more than 34 000 datum points. The ERT profiles reveal up to similar to 50 m thick landslide debris, locally covering up to similar to 30 m of rock debris with entrained fine-grained sediments on top of isolated remnants of decametre-wide paleolake sediments. The ERT profiles allow us to infer processes involved in the interaction of the rock avalanche with bedrock, lake sediments, and morainal sediments, including shearing, bulging, and bulldozing. Complementary data from drilling, a gravel pit exposure, laboratory tests, and geomorphic features were used for ERT calibration. Sediments overrun by the rock avalanche show water-escape structures. Based on all of these datasets, we reconstructed both position and size of the paleolake prior to the catastrophic event. Our reconstruction of the event contributes to process an understanding of the rock avalanche and future modelling and hazard assessment. Here we show how integrated geomorphic, geophysical, and sedimentological approaches can provide detailed insights into the impact of a rock avalanche on a lake. (c) 2020 The Authors. Earth Surface Processes and Landforms published by John Wiley & Sons Ltd
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