DOCSLIB.ORG

Multiscale Micro-CT Imaging on Sediment Cores: Unravelling the Paleoflow Directions in a Megaturbidite (Lake Lucerne, Switzerland)

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
Multiscale Micro-CT Imaging on Sediment Cores: Unravelling the Paleoflow Directions in a Megaturbidite (Lake Lucerne, Switzerland) FACULTY OF SCIENCES Master of Science in geology Multiscale micro-CT imaging on sediment cores: Unravelling the paleoflow directions in a megaturbidite (Lake Lucerne, Switzerland) Maxim Deprez Academic year 2015–2016 Master’s dissertation submitted in partial fulfillment of the requirements for the degree of Master in Science in Geology Promotor: Dr. M. Van Daele Co-promotor: Dr. M. Boone Jury: Prof. Dr. V. Cnudde, Prof. Dr. D. Van Rooij Acknowledgments Besides time, a lot of people are necessary to brew a master’s thesis. All of them deserve a lot of my gratitude. First of all, I would like to thank both of my promoters, Maarten Van Daele and Marijn Boone, for merging both of their scientific worlds into my thesis. Maarten, without your insights and expertise in sedimentological research, your delivered data and suggestions and especially your extreme skills in taking U-channels, I certainly would have been lost in the Great Turbidite Forest. Thank you for guiding me through it safely. Marijn, your excessive knowledge of X-ray computed tomography, your problem-solving way of thinking and your drive to deliver every CT scan as a piece of perfection was the foundation of the thesis. To both, thank you very much! Furthermore, I would like to thank Prof. Veerle Cnudde and Jeroen Van Stappen, to help to get the subject and workflow on track and make sure it was all well-advised. Many thanks go also to the staff of UGCT, for using their facility and equipment, and the people of RCMG, who were all open to offer help at any time, with anything. Dear classmates, you guys delivered the five best years of my scholar history. Your drive and enthusiasm in class, as well as outside on the field and other ‘student-related’ activities were truly inspiring. Thank you for the necessary coffee breaks during writing or letting me join you when I was wandering through the corridors of the S8, desperately looking for a free computer to work on. The end of our career at the university does not mean goodbye to me. Friends, many thanks to you all! To my non-geology friends, thank you to snap my dissertation balloon once in while over the past months. Your will to still wanting to take me out, aware that I could annoy you with fun facts about geology, is astonishing and admirable. You fellows are awesome, thank you! The largest amount of gratitude goes to my family, who not only dragged me through the past months, but supported me unconditionally throughout my life and lifted me up to the person I am today. Your capability to stand the alteration of overly simplistic humour, an overload of energy and ‘just-leave-me-alone’ moments during exam periods and the last weeks before the deadline, is sincerely remarkable! Dank je mama, papa en Manon om er voor me te zijn. Without all of you, writing this dissertation would have been a hideous task and most likely never completed. I am grateful to you all. Table of Content 1. INTRODUCTION .................................................................................................................. 1 2. GEOGRAPHICAL AND GEOLOGICAL SETTING ........................................................................ 3 3. THE INFLUENCE OF EARTHQUAKES ON LAKE SEDIMENTS ..................................................... 5 3.1. TERMINOLOGY REGARDING DENSITY FLOWS ....................................................................................... 5 3.2. EARTHQUAKES AND DENSITY FLOWS ................................................................................................. 8 3.3. ‘SEICHE-WAVE’ WATER MOVEMENT ................................................................................................ 10 3.4. FLOW DIRECTIONS ....................................................................................................................... 11 4. THE 1601 A.D. EARTHQUAKE AND THE RELATED SEDIMENTS ............................................. 15 4.1. THE EARTHQUAKE EVENT .............................................................................................................. 15 4.2. PREVIOUS RESEARCH ON 1601 AD EARTHQUAKE RELATED SEDIMENTS ................................................. 15 5. X-RAY COMPUTED TOMOGRAPHY .................................................................................... 23 5.1. INTRODUCTION ........................................................................................................................... 23 5.1.1. X-rays and the development of Computed Tomography (CT) ......................................... 23 5.1.2. Use in geological applications ......................................................................................... 24 5.2. BASIC PRINCIPLES OF X-RAY TRANSMISSION CT ................................................................................. 24 5.2.1. Interaction X-rays with matter ........................................................................................ 24 5.2.2. X-ray transmission CT ...................................................................................................... 26 5.3. X-RAY SYSTEMS ........................................................................................................................... 27 5.3.1. Basic components ............................................................................................................ 27 5.3.2. Medical CT scanner .......................................................................................................... 28 5.3.3. Micro-CT scanner ............................................................................................................. 28 5.4. IMAGE QUALITY AND ARTEFACTS .................................................................................................... 29 5.4.1. Resolution ........................................................................................................................ 29 5.4.2. Discretization effects and Partial Volume effects ............................................................ 30 5.4.3. Ring artefacts ................................................................................................................... 31 5.5. DATA VISUALISATION ................................................................................................................... 31 5.6. 3D DATA ANALYSIS ...................................................................................................................... 31 6. METHODS ........................................................................................................................ 33 6.1. PREVIOUS WORK ......................................................................................................................... 33 6.1.1. Coring ............................................................................................................................... 33 6.1.2. Measurements on closed core ......................................................................................... 34 6.1.3. Orientation ....................................................................................................................... 35 6.2. SUBSAMPLING ............................................................................................................................ 35 6.2.1. Lucerne and Eklutna Straws ............................................................................................. 37 6.2.2. U-channel ......................................................................................................................... 37 6.2.3. Straw subsamples ............................................................................................................ 38 6.3. X-RAY CT ................................................................................................................................... 38 6.3.1. Scanning........................................................................................................................... 38 6.3.2. Processing and analysis ................................................................................................... 39 6.3.3. Orienting CT-derived data towards the magnetic north ................................................. 40 6.4. LASER-DIFFRACTION GRAIN-SIZE ANALYSIS ....................................................................................... 41 7. RESULTS ........................................................................................................................... 43 7.1. TEST STRAWS .............................................................................................................................. 43 7.1.1. µCT images and processing ............................................................................................. 43 7.1.2. Grain size ......................................................................................................................... 47 7.1.3. Orientation ....................................................................................................................... 50 7.2. U-CHANNEL ............................................................................................................................... 52 7.2.1. µCT images and processing ............................................................................................. 52 7.2.2. Grain size ......................................................................................................................... 54 7.2.3. Orientation ......................................................................................................................
Load more

Recommended publications
  • HOBIM Liste OW
    HOBIM: Liste Obwalden Stand 22.04.2016 Anlage Nr Objekt NrAnlagebezeichnung Gemeinde Objektbez Bauwerksart Einstufung Schutzziel Mehrfam.häuser 4417 RE Kägiswil N+R 6060 Sarnen Wohn-,Bürogebäude übl. Ausb. L (lokal) 9 (partiell) 4346 BL Flugplatz 6055 Alpnach Halle 2 Hangars L (lokal) 8 (integral) 4346 BF Flugplatz 6055 Alpnach Bürogebäude Bürobauten L (lokal) 9 (partiell) Lagergebäude 4346 AB Flugplatz 6055 Alpnach Lagerschuppen allgemein L (lokal) 9 (partiell) 4376 EJ - 6074 Giswil Material-Magazin Holz L (lokal) 8 (integral) 4346 BG Flugplatz 6055 Alpnach Funkturm Flugsicherung L (lokal) 9 (partiell) 4346 BM Flugplatz 6055 Alpnach Halle 3 Hangars L (lokal) 8 (integral) Lagergebäude 4340 AT Zeughauskreis 3 6055 Alpnach Korpsmaterialbaracke allgemein L (lokal) 9 (partiell) Massenunterk.M 4346 EN Flugplatz 6055 Alpnach Unterkunftsbaracke ilit.+Zivil R (regional) 9 (partiell) Massenunterk.M 4346 EA Flugplatz 6055 Alpnach Unterkunftsbaracke ilit.+Zivil R (regional) 9 (partiell) Massenunterk.M 4346 EJ Flugplatz 6055 Alpnach Unterkunftsbaracke ilit.+Zivil R (regional) 9 (partiell) Massenunterk.M 4346 EM Flugplatz 6055 Alpnach Unterkunftsbaracke ilit.+Zivil R (regional) 9 (partiell) 4346 AC Flugplatz 6055 Alpnach Hangar 1 Flz-Schuppen R (regional) 8 (integral) Massenunterk.M 4346 EL Flugplatz 6055 Alpnach Unterkunftsbaracke ilit.+Zivil R (regional) 9 (partiell) Massenunterk.M 4346 EQ Flugplatz 6055 Alpnach Unterkunftsbaracke ilit.+Zivil R (regional) 9 (partiell) Lagergebäude 4417 QY Kägiswil N+R 6060 Sarnen Kabelrollenlager allgemein R (regional)
    [Show full text]
  • A Geological Boat Trip on Lake Lucerne
    A geological boat trip on Lake Lucerne Walter Wildi & Jörg Uttinger 2019 h=ps://www.erlebnis-geologie.ch/geoevent/geologische-schiffFahrt-auF-dem-vierwaldstae=ersee-d-e-f/ 1 A geological boat trip on Lake Lucerne Walter Wildi & Jörg Uttinger 2019 https://www.erlebnis-geologie.ch/geoevent/geologische-schifffahrt-auf-dem-vierwaldstaettersee-d-e-f/ Abstract This excursion guide takes you on a steamBoat trip througH a the Oligocene and the Miocene, to the folding of the Jura geological secYon from Lucerne to Flüelen, that means from the mountain range during the Pliocene. edge of the Alps to the base of the so-called "HelveYc Nappes". Molasse sediments composed of erosion products of the rising The introducYon presents the geological history of the Alpine alpine mountains have been deposited in the Alpine foreland from region from the Upper Palaeozoic (aBout 315 million years ago) the Oligocene to Upper Miocene (aBout 34 to 7 Milion years). througH the Mesozoic era and the opening up of the Alpine Sea, Today's topograpHy of the Alps witH sharp mountain peaks and then to the formaYon of the Alps and their glacial erosion during deep valleys is mainly due to the action of glaciers during the last the Pleistocene ice ages. 800,000 years of the ice-ages in the Pleistocene. The Mesozoic (from 252 to 65 million years) was the period of the The cruise starts in Lucerne, on the geological limit between the HelveYc carBonate plaaorm, associated witH a higH gloBal sea Swiss Plateau and the SuBalpine Molasse. Then it leads along the level.
    [Show full text]
  • A Hydrographic Approach to the Alps
    • • 330 A HYDROGRAPHIC APPROACH TO THE ALPS A HYDROGRAPHIC APPROACH TO THE ALPS • • • PART III BY E. CODDINGTON SUB-SYSTEMS OF (ADRIATIC .W. NORTH SEA] BASIC SYSTEM ' • HIS is the only Basic System whose watershed does not penetrate beyond the Alps, so it is immaterial whether it be traced·from W. to E. as [Adriatic .w. North Sea], or from E. toW. as [North Sea . w. Adriatic]. The Basic Watershed, which also answers to the title [Po ~ w. Rhine], is short arid for purposes of practical convenience scarcely requires subdivision, but the distinction between the Aar basin (actually Reuss, and Limmat) and that of the Rhine itself, is of too great significance to be overlooked, to say nothing of the magnitude and importance of the Major Branch System involved. This gives two Basic Sections of very unequal dimensions, but the ., Alps being of natural origin cannot be expected to fall into more or less equal com­ partments. Two rather less unbalanced sections could be obtained by differentiating Ticino.- and Adda-drainage on the Po-side, but this would exhibit both hydrographic and Alpine inferiority. (1) BASIC SECTION SYSTEM (Po .W. AAR]. This System happens to be synonymous with (Po .w. Reuss] and with [Ticino .w. Reuss]. · The Watershed From .Wyttenwasserstock (E) the Basic Watershed runs generally E.N.E. to the Hiihnerstock, Passo Cavanna, Pizzo Luceridro, St. Gotthard Pass, and Pizzo Centrale; thence S.E. to the Giubing and Unteralp Pass, and finally E.N.E., to end in the otherwise not very notable Piz Alv .1 Offshoot in the Po ( Ticino) basin A spur runs W.S.W.
    [Show full text]
  • Report Reference
    Report Excursion géologique en bateau à vapeur sur le Lac des Quatre-Cantons WILDI, Walter, UTTINGER, Joerg & Erlebnis-Geologie Abstract Français: Excursion géologique en bateau à vapeur sur le Lac des Quatre- Cantons Ce guide d’excursion propose un tour en bateau à vapeur sur le Lac des Quatre-Cantons, le long d’une section géologique entre Lucerne et Flüelen, de la bordure des Alpes jusqu’à la base des Nappes helvétiques. L’introduction présente l’histoire géologique du Paléozoïque supérieur (dès env. 315 mio d’années), à travers le Mésozoïque et l’ouverture de la mer alpine, au plissement des Alpes et l’érosion des chaînes de montagnes par les glaciers. Le voyage en bateau commence à Lucerne, à la limite géologique entre la Molasse du Plateau et la Molasse subalpine. Ensuite, elle suit le massif de la Rigi, formé par une écaille de Molasse subalpine inclinée vers le Sud. A Vitznau le bateau traverse la limite du bâti des Nappes helvétiques. Sur le Lac d’Urnen on suit d’abord la Nappe du Drusberg et ses plis spectaculaires, puis la Nappe de l’Axen. Le terminus se situe à Flüelen, dans des paysages plus doux, situés sur les sédiments de la couverture du Massif de l’Aar. Allemand: Geologische [...] Reference WILDI, Walter, UTTINGER, Joerg & Erlebnis-Geologie. Excursion géologique en bateau à vapeur sur le Lac des Quatre-Cantons. Berne : Erlebnis-Geologie, 2019, 23 p. Available at: http://archive-ouverte.unige.ch/unige:121454 Disclaimer: layout of this document may differ from the published version. 1 / 1 A geological boat trip on Lake
    [Show full text]
  • Article (Published Version)
    Article Local to regional scale industrial heavy metal pollution recorded in sediments of large freshwater lakes in central Europe (lakes Geneva and Lucerne) over the last centuries THEVENON, Florian, et al. Reference THEVENON, Florian, et al. Local to regional scale industrial heavy metal pollution recorded in sediments of large freshwater lakes in central Europe (lakes Geneva and Lucerne) over the last centuries. Science of the Total Environment, 2011, vol. 412-413, p. 239-247 DOI : 10.1016/j.scitotenv.2011.09.025 Available at: http://archive-ouverte.unige.ch/unige:17728 Disclaimer: layout of this document may differ from the published version. 1 / 1 This article appeared in a journal published by Elsevier. The attached copy is furnished to the author for internal non-commercial research and education use, including for instruction at the authors institution and sharing with colleagues. Other uses, including reproduction and distribution, or selling or licensing copies, or posting to personal, institutional or third party websites are prohibited. In most cases authors are permitted to post their version of the article (e.g. in Word or Tex form) to their personal website or institutional repository. Authors requiring further information regarding Elsevier’s archiving and manuscript policies are encouraged to visit: http://www.elsevier.com/copyright Author's personal copy Science of the Total Environment 412-413 (2011) 239–247 Contents lists available at SciVerse ScienceDirect Science of the Total Environment journal homepage: www.elsevier.com/locate/scitotenv Local to regional scale industrial heavy metal pollution recorded in sediments of large freshwater lakes in central Europe (lakes Geneva and Lucerne) over the last centuries Florian Thevenon a,⁎, Neil D.
    [Show full text]
  • Gästebroschüre Guest Brochure
    GÄSTEBROSCHÜRE GUEST BROCHURE WINTER 2020/2021 Cover : INHALT TABLE OF CONTENTS Blick vom Bonistock auf Erzegg, Melchsee-Frutt Langlaufloipe im Langis 05 Anreise 35 Entdecken 55 Panoramakarte Getting here Discover Panoramic map 06 Ferienorte 37 Erholen Holiday destinations Relax 09 Top-Events 50 Geniessen Top events Enjoy 10 Erleben 52 ­Information Experience Information WO ? ANREISE GETTING HERE OW ! WILLKOMMEN IM MITTELPUNKT Ferien können Sie überall machen. Im Mittelpunkt stehen Sie aber nur bei uns. Nicht einzig, weil unser Kanton die geografische Mitte der Schweiz bildet, nein: Vor allem weil wir hier in Obwalden Gastfreundschaft als Wert betrachten, nicht als Schlagwort. Sie werden das schnell spüren – in unseren Ferienorten und Wintersportgebieten hat man Zeit für Sie; unsere Unterkünfte werden nicht von Managern geführt, sondern von Menschen. In unseren oft lokal geprägten Restaurants und Hütten empfängt man Sie voller Wärme. Bei Veranstaltungen begegnen wir Ihnen als Freunde, nicht als Fremde und wenn Sie bei uns ein Abenteuer wagen, sind Sie nicht nur in kompetenten, sondern in fürsorglichen Händen. Erfreuen Sie sich Ihres Winters bei uns und achten Sie beim Blättern in Luzern-Interlaken Express / Lungerersee dieser Gästebroschüre besonders auf unsere Geheimtipps – den Kern echter, entspannter Ferien im Mittelpunkt. Obwalden bildet, eingebettet zwischen Lu- Nestling between Lucerne and Interlaken, zern und Interlaken, die geografische Mitte der Obwalden marks the geographical centre Schweiz (Älggialp). Die Ferienregion liegt of Switzerland (Älggialp). This holiday region an der Gotthard-Nord-Süd-Verbindung und is situated on the Gotthard north-south tran- ist vom Flughafen Zürich Kloten mit dem sit route, less than one hour’s drive from WELCOME TO THE HEART OF SWITZERLAND! Auto in weniger als einer Stunde erreichbar.
    [Show full text]
  • Structural Geology of Central Switzerland : Results of Seismic Campaign in 2011 in Cantons Nid- and Obwalden
    Structural geology of Central Switzerland : results of seismic campaign in 2011 in cantons Nid- and Obwalden Autor(en): Ebert, Andreas / Genoni, Oliver / Häring, Markus Objekttyp: Article Zeitschrift: Swiss bulletin für angewandte Geologie = Swiss bulletin pour la géologie appliquée = Swiss bulletin per la geologia applicata = Swiss bulletin for applied geology Band (Jahr): 18 (2013) Heft 1 PDF erstellt am: 11.10.2021 Persistenter Link: http://doi.org/10.5169/seals-391139 Nutzungsbedingungen Die ETH-Bibliothek ist Anbieterin der digitalisierten Zeitschriften. Sie besitzt keine Urheberrechte an den Inhalten der Zeitschriften. Die Rechte liegen in der Regel bei den Herausgebern. Die auf der Plattform e-periodica veröffentlichten Dokumente stehen für nicht-kommerzielle Zwecke in Lehre und Forschung sowie für die private Nutzung frei zur Verfügung. Einzelne Dateien oder Ausdrucke aus diesem Angebot können zusammen mit diesen Nutzungsbedingungen und den korrekten Herkunftsbezeichnungen weitergegeben werden. Das Veröffentlichen von Bildern in Print- und Online-Publikationen ist nur mit vorheriger Genehmigung der Rechteinhaber erlaubt. Die systematische Speicherung von Teilen des elektronischen Angebots auf anderen Servern bedarf ebenfalls des schriftlichen Einverständnisses der Rechteinhaber. Haftungsausschluss Alle Angaben erfolgen ohne Gewähr für Vollständigkeit oder Richtigkeit. Es wird keine Haftung übernommen für Schäden durch die Verwendung von Informationen aus diesem Online-Angebot oder durch das Fehlen von Informationen. Dies gilt auch
    [Show full text]
  • A TEX86 Lake Record Suggests Simultaneous Shifts in Temperature
    GEOPHYSICAL RESEARCH LETTERS, VOL. 40, 948–953, doi:10.1002/GRL.50181, 2013 A TEX86 lake record suggests simultaneous shifts in temperature in Central Europe and Greenland during the last deglaciation Cornelia I. Blaga,1 Gert-Jan Reichart,1,2 André F. Lotter,1 Flavio S. Anselmetti,3,4 and Jaap S. Sinninghe Damsté1,2 Received 14 December 2012; revised 18 January 2013; accepted 21 January 2013; published 11 March 2013. [1] High-resolution quantitative temperature records from 2000; Heiri and Lotter, 2005]. The reconstructed amplitude continents covering glacial to interglacial transitions are of the changes in July/summer temperature in Central Europe scarce but important for understanding the climate system. during the shifts from the Oldest Dryas to the Interstadial We present the first decadal resolution record of (i.e., Bølling/Allerød), from the Interstadial to the Younger continental temperatures in Central Europe during the last Dryas (YD), and finally from the YD to the early Holocene deglaciation (~14,600–10,600 cal. yr B.P.) based on the are believed to range between 3C and 6C [e.g., Coope organic geochemical palaeothermometer TEX86. The TEX86- et al. 1998; Lotter et al., 2000, 2012]. Ostracod oxygen- inferred temperature record from Lake Lucerne stable isotope signatures from perialpine lake sediments (Vierwaldstättersee, Switzerland) reveals typical oscillations indicate that the annual mean air temperature at the onset during the Late Glacial Interstadial, followed by an abrupt of the YD decreased by 5C, while the transition to the cooling of 2C at the onset of Younger Dryas and a rapid Holocene is marked by a rapid increase of 7C[Schwalb, warming of 4C at the onset of the Holocene, within less 2003].
    [Show full text]
  • Nicholas Von Der Flue
    IV NICHOLAS VON DER FLUE ABOUT a quarter of a mile from the lake of Sarnen which at one time no doubt formed part of the lake of Lucerne but is now separated from it by the swampy valley of the Sarner Aa lies the village of Sachseln. In these days it is a popular summer resort; visitors to the church are shown the High Altar under which rest the bones of Nicholas von der Flue; his portrait hangs in the Sacristy. Good pedestrians will also climb to the Fliihli Ranft and even higher up to the Fliihli Inn on a spur of the Sachseler Grat; near which they are shown the house where Nicolas was born. But another spot, a secluded cave in the mountain-side, a little lower down on the slopes of the Ranft, may attract them more. Near it is an inscription in the rock, of a very unusual, indeed unique, character, of which more presently. There may be those who, looking round on the beautiful and wild mountain scenery, may stop to wonder whether the air or the ether? is still impregnated with the faith and love of a soul who lived here alone with God five hundred years ago. He was born on a farm in this mountain region above the beautiful lake in 1417. In childhood and youth he helped in its work and was a lad noted for his courtesy to everyone and for his merry looks. But another trait struck his con- temporaries most. When returning with others from the day's work he used to fall behind, and when he believed himself unobserved find a hidden place for prayer, then came home later silently and alone.
    [Show full text]
  • Spatial Patterns of Frequent Floods in Switzerland
    Hydrological Sciences Journal ISSN: 0262-6667 (Print) 2150-3435 (Online) Journal homepage: http://www.tandfonline.com/loi/thsj20 Spatial patterns of frequent floods in Switzerland Klaus Schneeberger, Ole Rössler & Rolf Weingartner To cite this article: Klaus Schneeberger, Ole Rössler & Rolf Weingartner (2018): Spatial patterns of frequent floods in Switzerland, Hydrological Sciences Journal To link to this article: https://doi.org/10.1080/02626667.2018.1450505 Accepted author version posted online: 29 Mar 2018. Submit your article to this journal View related articles View Crossmark data | downloaded: 6.1.2020 https://doi.org/10.7892/boris.114004 source: Full Terms & Conditions of access and use can be found at http://www.tandfonline.com/action/journalInformation?journalCode=thsj20 Spatial patterns of frequent floods in Switzerland Klaus Schneebergera,b,c, Ole Rösslerb, Rolf Weingartnerb,c aalpS - Centre for Climate Change Adaptation, Grabenweg 68, AT-6020 Innsbruck, Austria bInstitute of Geography, Hydrology Group, University of Bern, Hallerstrasse 12, CH- 3012 Bern, Switzerland cOeschger Centre for Climate Change Research, Bern, Switzerland Contact: [email protected] Abstract This study investigates the spatial dependence of high and extreme streamflows in Switzerland across different scales. First, using 56 runoff time series from Swiss rivers, we determined the average length of high-streamflow events for different levels of extremeness. Second, a dependence measure that expressed the probability that streamflow peaks would meet or exceed streamflow peaks at a conditioning site was used to describe and map the spatial extent of joint streamflow-peak occurrences across Switzerland. Third, we analysed the spatial patterns of jointly occurring high streamflows using cluster analysis to identify groups that react similarly in terms of flood frequency at different sites.
    [Show full text]
  • Mueterschwanderberg )
    HHH SAMSTAG, 27. OKTOBER 2018 WANDERUNGEN IN DER SCHWEIZ 2018/19 SAMSTAG, 27. OKTOBER 2018 T2 VERSCHIEBEDATUM: SONNTAG, 28. OKTOBER 2018 MUETERSCHWANDERBERG ) 5 000 8 A1 3 B ( © swisstopo MUETERSCHWANDERBERG — EIN WANDERVORSCHLAG VON MONIKA HOLLENSTEIN 4 Zwischen Stanserhorn und Alpnachersee Von Kerns im Kanton Obwalden gehen wir an schmucken Bauernhäusern vorbei zum Kern- wald. In diesem müssen wir uns vor den «Chärwaldräubern» in Acht nehmen, die hier ihr Un- 2 wesen treiben. Ein Erlebnisparcours bringt Besuchern die Besonderheiten dieser einmaligen Waldlandschaft näher. Am idyllischen Gerzensee geniessen wir eine erste Pause, bevor wir die Grenze zum Kanton Nidwalden überqueren. Nach einem kurzen Stück auf einer Asphalt strasse folgen wir einem wunderbaren schmalen Waldweg hinauf zur Drachenflue. Dieser Weg, wel- cher auf keiner Karte verzeichnet ist, wurde mir von Einheimischen gezeigt. Oben angelangt werden wir mit einer traumhaften Aussicht belohnt, bevor wir durch den herbstlichen Wald zum Alpnacher see absteigen. Diesem und der Sarner Aa entlang wandern wir bis zum Militär- 1 flugplatz der Schweizer Luftwaffe in Alpnach. Wir überqueren die Landepiste zum Bahnhof 1 KM Alpnach Dorf und müssen vielleicht vor geschlossener Barriere kurz warten, denn der Wander- weg quert die Lande- und Startbahn. Kerns → Drachenflue → Alpnach Dorf Stationen Dauer/h Gesamt/h Auf einen Blick Abkürzung: möglich 1 Kerns 0:00 Schwierigkeit HHH/T2 Verpflegung: aus dem Rucksack 2 Gerzenseeli 1:00 1:00 Distanz 14,9 km Wanderleitung: Monika Hollenstein, Lydia Beer 3 Drachenflue 1:40 2:40 Aufstieg 500 m 4 Alpnach Dorf 1:50 4:30 Abstieg 610 m Fahrplan: Karte Stans 245T Hinfahrt Rückfahrt Zürich HB ab 08:04 Alpnach Dorf ab 15:54 S5 Luzern ab 09:12 S5 Luzern ab 16:35 Sarnen ab 09:44 Bus 343 Zürich HB an 17:25 Kerns Post an 09:50 Kerns Gerzenseeli Drachenflue Alpnach Dorf Fahrpreis (Halbtax) ab Zürich HB: 563 m 579 m 859 m 452 m CHF 17.– (einfache Fahrt Zürich HB–Kerns, Post); CHF 14.50 (einfache Fahrt Alpnach Dorf–Zürich HB).
    [Show full text]
  • 15,000 Years of Mass-Movement History in Lake Lucerne: Implications for Seismic and Tsunami Hazards
    0012-9402/06/030409-20 Eclogae geol. Helv. 99 (2006) 409–428 DOI 10.1007/s00015-006-1196-7 Birkhäuser Verlag, Basel, 2007 15,000 Years of mass-movement history in Lake Lucerne: Implications for seismic and tsunami hazards MICHAEL SCHNELLMANN1*,FLAVIO S. ANSELMETTI1,DOMENICO GIARDINI2 & JUDITH A. MCKENZIE1 Key words: Mass-flow deposits, megaturbidites, lacustrine sedimentation, natural hazard, paleoseismology, seismic stratigraphy, Central Switzerland ABSTRACT ZUSAMMENFASSUNG A chronological catalogue of Late Glacial and Holocene mass-movement de- Ein chronologischer Katalog von Rutschungsablagerungen im Untergrund posits in Chrüztrichter and Vitznau Basins of Lake Lucerne (Vierwaldstät- von 2 Becken des Vierwaldstättersees (Chrüztrichter und Vitznaubecken) tersee) reveals a complex history of natural hazards affecting the lake and its zeugt von verschiedenen Naturgefahren, welche den See und dessen Ufer shores. Ninety-one mass-flow and six megaturbidite deposits have been identi- beeinträchtigen. Mit Hilfe eines dichten Netzes von mehr als 300 km hochauf- fied and mapped out with a grid of more than 300 km high-resolution seismic lösender reflektions-seismischer Profile wurden subaquatische Abrisskanten, profiles. An age model based on the analyses of 10 long piston cores, 2 tephra Bergsturzfächer, sowie 91 Rutschungs- und 6 grosse Turbiditablagerungen layers and 32 AMS-14C ages allowed building up a chronological event cata- identifiziert und mit seismisch-stratigraphischen Methoden auskartiert. Die logue covering the last 15,000 years. Most of the identified mass-flow deposits Analyse von 10 Langkernen, zwei Aschenlagen und 32 AMS-14C Datierungen relate to subaqueous sliding and subaerial rockfalling, as indicated by slide ermöglichten eine Altersbestimmung der Ereignisse und das Erstellen eines scars and rockfall cones on the lake floor.
    [Show full text]