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
| العنوان: | 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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| المؤلفون: | Michael Krautblatter, Sibylle Knapp, Bernhard Lempe, Philipp Mamot |
| المساهمون: | Mamot, Philipp, 1 Landslides Research Group Technical University of Munich Munich Germany, Lempe, Bernhard, 2 Engineering Geology Technical University of Munich Munich Germany, Krautblatter, Michael |
| المصدر: | Earth Surface Processes and Landforms. 46:296-306 |
| بيانات النشر: | Wiley, 2020. |
| سنة النشر: | 2020 |
| مصطلحات موضوعية: | ERT calibration, 010504 meteorology & atmospheric sciences, Geography, Planning and Development, runout, rock avalanche, Northern Calcareous Alps, 010502 geochemistry & geophysics, 01 natural sciences, Archaeology, ddc, Zugspitze, lake impact, paleolake reconstruction, Eibsee, Earth and Planetary Sciences (miscellaneous), water‐escape structures, Geology, 0105 earth and related environmental sciences, Earth-Surface Processes |
| الوصف: | 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 km3 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 ~50 m thick landslide debris, locally covering up 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. © 2020 The Authors. Earth Surface Processes and Landforms published by John Wiley & Sons Ltd The Eibsee rock avalanche detached from Mount Zugspitze and impacted and destroyed Paleolake Eibsee. Paleolake Eibsee was larger than modern Lake Eibsee; the rock avalanche deposit covers the northern half of the paleolake. The complementary application of geomorphology, electrical resistivity tomography (ERT) and sedimentology allows for ERT calibration at seven different sites, where materials (rock avalanche, bedrock, lake clay, mixed sediments) and effects of the impact (bulldozing, bulging, overriding of secondary lobes, splashing of boulders) can be distinguished. Studienstiftung des Deutschen Volkes e.V. (German National Academic Foundation): http://dx.doi.org/10.13039/501100004350Test |
| وصف الملف: | application/pdf |
| تدمد: | 1096-9837 0197-9337 |
| الوصول الحر: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::cfb030482c9ddecf630e594d34c71f3bTest https://doi.org/10.1002/esp.5024Test |
| حقوق: | OPEN |
| رقم الانضمام: | edsair.doi.dedup.....cfb030482c9ddecf630e594d34c71f3b |
| قاعدة البيانات: | OpenAIRE |
| تدمد: | 10969837 01979337 |
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