Permafrost below the Timberline Confirmed and Characterized by Geoelectrical Resistivity Measurements, Bever Valley, Eastern Swiss Alps
Identifieur interne : 001913 ( Istex/Corpus ); précédent : 001912; suivant : 001914Permafrost below the Timberline Confirmed and Characterized by Geoelectrical Resistivity Measurements, Bever Valley, Eastern Swiss Alps
Auteurs : Christof Kneisel ; Christian Hauck ; Daniel Vonder MühllSource :
- Permafrost and Periglacial Processes [ 1045-6740 ] ; 2000-12.
English descriptors
Abstract
In the Bever Valley, Upper Engadine, eastern Swiss Alps, one‐dimensional DC resistivity soundings and two‐dimensional DC resistivity tomography were performed at a site where both GIS‐based modelling and measurements of the bottom temperature of the winter snow cover (BTS) suggest a potential permafrost occurrence at low altitude (1840 m ASL). The results of the geoelectric measurements indeed point to a permafrost occurrence below the timberline which consists of several thin permafrost lenses. In comparison with other Alpine permafrost sites the resistivities are fairly low which might be expected at a low altitude location with permafrost temperatures probably close to 0 °C. The active layer appears to be fairly thin which is surprising for a permafrost occurrence at mean annual air temperatures well above 0 °C. Here, the reduced radiation due to the topography as well as the organic layers are considered to play an important role in insulating the subsurface and controlling the ground thermal regime. The permafrost occurrence is assumed to be a result of the interaction of climatic conditions and topography as well as surface and subsurface factors. The application of resistivity measurements is shown to be a useful geophysical method as the organic layers provide good ground contact for the electrodes. Furthermore, the application of one‐dimensional DC resistivity soundings in combination with two‐dimensional DC resistivity tomography proves to be a useful tool for mapping and characterizing isolated permafrost occurrences on a small scale. Copyright © 2000 John Wiley & Sons, Ltd.
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DOI: 10.1002/1099-1530(200012)11:4<295::AID-PPP353>3.0.CO;2-L
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<record><TEI wicri:istexFullTextTei="biblStruct"><teiHeader><fileDesc><titleStmt><title xml:lang="en">Permafrost below the Timberline Confirmed and Characterized by Geoelectrical Resistivity Measurements, Bever Valley, Eastern Swiss Alps</title><author><name sortKey="Kneisel, Christof" sort="Kneisel, Christof" uniqKey="Kneisel C" first="Christof" last="Kneisel">Christof Kneisel</name><affiliation><mods:affiliation>Department of Physical Geography, Faculty of Geography and Geosciences, University of Trier, Germany</mods:affiliation></affiliation><affiliation><mods:affiliation>Faculty of Geography and Geosciences, University of Trier, D‐54286, Trier, Germany.</mods:affiliation></affiliation></author><author><name sortKey="Hauck, Christian" sort="Hauck, Christian" uniqKey="Hauck C" first="Christian" last="Hauck">Christian Hauck</name><affiliation><mods:affiliation>Laboratory of Hydraulics, Hydrology and Glaciology, ETH‐Zurich, Switzerland</mods:affiliation></affiliation></author><author><name sortKey="Muhll, Daniel Vonder" sort="Muhll, Daniel Vonder" uniqKey="Muhll D" first="Daniel Vonder" last="Mühll">Daniel Vonder Mühll</name><affiliation><mods:affiliation>Laboratory of Hydraulics, Hydrology and Glaciology, ETH‐Zurich, Switzerland</mods:affiliation></affiliation></author></titleStmt><publicationStmt><idno type="wicri:source">ISTEX</idno><idno type="RBID">ISTEX:3B3667B6E82C484BF2921F295F1A87C286E01AAE</idno><date when="2000" year="2000">2000</date><idno type="doi">10.1002/1099-1530(200012)11:4<295::AID-PPP353>3.0.CO;2-L</idno><idno type="url">https://api.istex.fr/document/3B3667B6E82C484BF2921F295F1A87C286E01AAE/fulltext/pdf</idno><idno type="wicri:Area/Istex/Corpus">001913</idno><idno type="wicri:explorRef" wicri:stream="Istex" wicri:step="Corpus" wicri:corpus="ISTEX">001913</idno></publicationStmt><sourceDesc><biblStruct><analytic><title level="a" type="main" xml:lang="en">Permafrost below the Timberline Confirmed and Characterized by Geoelectrical Resistivity Measurements, Bever Valley, Eastern Swiss Alps</title><author><name sortKey="Kneisel, Christof" sort="Kneisel, Christof" uniqKey="Kneisel C" first="Christof" last="Kneisel">Christof Kneisel</name><affiliation><mods:affiliation>Department of Physical Geography, Faculty of Geography and Geosciences, University of Trier, Germany</mods:affiliation></affiliation><affiliation><mods:affiliation>Faculty of Geography and Geosciences, University of Trier, D‐54286, Trier, Germany.</mods:affiliation></affiliation></author><author><name sortKey="Hauck, Christian" sort="Hauck, Christian" uniqKey="Hauck C" first="Christian" last="Hauck">Christian Hauck</name><affiliation><mods:affiliation>Laboratory of Hydraulics, Hydrology and Glaciology, ETH‐Zurich, Switzerland</mods:affiliation></affiliation></author><author><name sortKey="Muhll, Daniel Vonder" sort="Muhll, Daniel Vonder" uniqKey="Muhll D" first="Daniel Vonder" last="Mühll">Daniel Vonder Mühll</name><affiliation><mods:affiliation>Laboratory of Hydraulics, Hydrology and Glaciology, ETH‐Zurich, Switzerland</mods:affiliation></affiliation></author></analytic><monogr></monogr><series><title level="j">Permafrost and Periglacial Processes</title><title level="j" type="abbrev">Permafrost Periglac. Process.</title><idno type="ISSN">1045-6740</idno><idno type="eISSN">1099-1530</idno><imprint><publisher>John Wiley & Sons, Ltd.</publisher><pubPlace>Chichester, UK</pubPlace><date type="published" when="2000-12">2000-12</date><biblScope unit="volume">11</biblScope><biblScope unit="issue">4</biblScope><biblScope unit="page" from="295">295</biblScope><biblScope unit="page" to="304">304</biblScope></imprint><idno type="ISSN">1045-6740</idno></series><idno type="istex">3B3667B6E82C484BF2921F295F1A87C286E01AAE</idno><idno type="DOI">10.1002/1099-1530(200012)11:4<295::AID-PPP353>3.0.CO;2-L</idno><idno type="ArticleID">PPP353</idno></biblStruct></sourceDesc><seriesStmt><idno type="ISSN">1045-6740</idno></seriesStmt></fileDesc><profileDesc><textClass><keywords scheme="KwdEn" xml:lang="en"><term>DC resistivity soundings</term><term>Swiss Alps</term><term>sporadic mountain permafrost</term><term>timberline</term></keywords></textClass><langUsage><language ident="en">en</language></langUsage></profileDesc></teiHeader><front><div type="abstract" xml:lang="en">In the Bever Valley, Upper Engadine, eastern Swiss Alps, one‐dimensional DC resistivity soundings and two‐dimensional DC resistivity tomography were performed at a site where both GIS‐based modelling and measurements of the bottom temperature of the winter snow cover (BTS) suggest a potential permafrost occurrence at low altitude (1840 m ASL). The results of the geoelectric measurements indeed point to a permafrost occurrence below the timberline which consists of several thin permafrost lenses. In comparison with other Alpine permafrost sites the resistivities are fairly low which might be expected at a low altitude location with permafrost temperatures probably close to 0 °C. The active layer appears to be fairly thin which is surprising for a permafrost occurrence at mean annual air temperatures well above 0 °C. Here, the reduced radiation due to the topography as well as the organic layers are considered to play an important role in insulating the subsurface and controlling the ground thermal regime. The permafrost occurrence is assumed to be a result of the interaction of climatic conditions and topography as well as surface and subsurface factors. The application of resistivity measurements is shown to be a useful geophysical method as the organic layers provide good ground contact for the electrodes. Furthermore, the application of one‐dimensional DC resistivity soundings in combination with two‐dimensional DC resistivity tomography proves to be a useful tool for mapping and characterizing isolated permafrost occurrences on a small scale. Copyright © 2000 John Wiley & Sons, Ltd.</div></front></TEI><istex><corpusName>wiley</corpusName><author><json:item><name>Christof Kneisel</name><affiliations><json:string>Department of Physical Geography, Faculty of Geography and Geosciences, University of Trier, Germany</json:string><json:string>Faculty of Geography and Geosciences, University of Trier, D‐54286, Trier, Germany.</json:string></affiliations></json:item><json:item><name>Christian Hauck</name><affiliations><json:string>Laboratory of Hydraulics, Hydrology and Glaciology, ETH‐Zurich, Switzerland</json:string></affiliations></json:item><json:item><name>Daniel Vonder Mühll</name><affiliations><json:string>Laboratory of Hydraulics, Hydrology and Glaciology, ETH‐Zurich, Switzerland</json:string></affiliations></json:item></author><subject><json:item><lang><json:string>eng</json:string></lang><value>DC resistivity soundings</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>sporadic mountain permafrost</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>Swiss Alps</value></json:item><json:item><lang><json:string>eng</json:string></lang><value>timberline</value></json:item></subject><articleId><json:string>PPP353</json:string></articleId><language><json:string>eng</json:string></language><originalGenre><json:string>article</json:string></originalGenre><abstract>In the Bever Valley, Upper Engadine, eastern Swiss Alps, one‐dimensional DC resistivity soundings and two‐dimensional DC resistivity tomography were performed at a site where both GIS‐based modelling and measurements of the bottom temperature of the winter snow cover (BTS) suggest a potential permafrost occurrence at low altitude (1840 m ASL). The results of the geoelectric measurements indeed point to a permafrost occurrence below the timberline which consists of several thin permafrost lenses. In comparison with other Alpine permafrost sites the resistivities are fairly low which might be expected at a low altitude location with permafrost temperatures probably close to 0 °C. The active layer appears to be fairly thin which is surprising for a permafrost occurrence at mean annual air temperatures well above 0 °C. Here, the reduced radiation due to the topography as well as the organic layers are considered to play an important role in insulating the subsurface and controlling the ground thermal regime. The permafrost occurrence is assumed to be a result of the interaction of climatic conditions and topography as well as surface and subsurface factors. The application of resistivity measurements is shown to be a useful geophysical method as the organic layers provide good ground contact for the electrodes. Furthermore, the application of one‐dimensional DC resistivity soundings in combination with two‐dimensional DC resistivity tomography proves to be a useful tool for mapping and characterizing isolated permafrost occurrences on a small scale. 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Cambridge University Press.</title></host></json:item></refBibs><genre><json:string>article</json:string></genre><host><volume>11</volume><publisherId><json:string>PPP</json:string></publisherId><pages><total>10</total><last>304</last><first>295</first></pages><issn><json:string>1045-6740</json:string></issn><issue>4</issue><subject><json:item><value>Research Article</value></json:item></subject><genre><json:string>journal</json:string></genre><language><json:string>unknown</json:string></language><eissn><json:string>1099-1530</json:string></eissn><title>Permafrost and Periglacial Processes</title><doi><json:string>10.1002/(ISSN)1099-1530</json:string></doi></host><categories><wos><json:string>science</json:string><json:string>geology</json:string><json:string>geography, physical</json:string></wos><scienceMetrix><json:string>economic & social sciences</json:string><json:string>social sciences</json:string><json:string>geography</json:string></scienceMetrix></categories><publicationDate>2000</publicationDate><copyrightDate>2000</copyrightDate><doi><json:string>10.1002/1099-1530(200012)11:4>295::AID-PPP353>3.0.CO;2-L</json:string></doi><id>3B3667B6E82C484BF2921F295F1A87C286E01AAE</id><score>0.9628751</score><fulltext><json:item><extension>pdf</extension><original>true</original><mimetype>application/pdf</mimetype><uri>https://api.istex.fr/document/3B3667B6E82C484BF2921F295F1A87C286E01AAE/fulltext/pdf</uri></json:item><json:item><extension>zip</extension><original>false</original><mimetype>application/zip</mimetype><uri>https://api.istex.fr/document/3B3667B6E82C484BF2921F295F1A87C286E01AAE/fulltext/zip</uri></json:item><istex:fulltextTEI uri="https://api.istex.fr/document/3B3667B6E82C484BF2921F295F1A87C286E01AAE/fulltext/tei"><teiHeader><fileDesc><titleStmt><title level="a" type="main" xml:lang="en">Permafrost below the Timberline Confirmed and Characterized by Geoelectrical Resistivity Measurements, Bever Valley, Eastern Swiss Alps</title></titleStmt><publicationStmt><authority>ISTEX</authority><publisher>John Wiley & Sons, Ltd.</publisher><pubPlace>Chichester, UK</pubPlace><availability><p>Copyright © 2000 John Wiley & Sons, Ltd.</p></availability><date>2000</date></publicationStmt><notesStmt><note>Forschungsfonds der Universität Trier.</note><note>PACE - No. EU ENV4‐CT97‐0492; No. BBW 97.0054‐1.;</note></notesStmt><sourceDesc><biblStruct type="inbook"><analytic><title level="a" type="main" xml:lang="en">Permafrost below the Timberline Confirmed and Characterized by Geoelectrical Resistivity Measurements, Bever Valley, Eastern Swiss Alps</title><author xml:id="author-1"><persName><forename type="first">Christof</forename><surname>Kneisel</surname></persName><affiliation>Department of Physical Geography, Faculty of Geography and Geosciences, University of Trier, Germany</affiliation><affiliation>Faculty of Geography and Geosciences, University of Trier, D‐54286, Trier, Germany.</affiliation></author><author xml:id="author-2"><persName><forename type="first">Christian</forename><surname>Hauck</surname></persName><affiliation>Laboratory of Hydraulics, Hydrology and Glaciology, ETH‐Zurich, Switzerland</affiliation></author><author xml:id="author-3"><persName><forename type="first">Daniel Vonder</forename><surname>Mühll</surname></persName><affiliation>Laboratory of Hydraulics, Hydrology and Glaciology, ETH‐Zurich, Switzerland</affiliation></author></analytic><monogr><title level="j">Permafrost and Periglacial Processes</title><title level="j" type="abbrev">Permafrost Periglac. Process.</title><idno type="pISSN">1045-6740</idno><idno type="eISSN">1099-1530</idno><idno type="DOI">10.1002/(ISSN)1099-1530</idno><imprint><publisher>John Wiley & Sons, Ltd.</publisher><pubPlace>Chichester, UK</pubPlace><date type="published" when="2000-12"></date><biblScope unit="volume">11</biblScope><biblScope unit="issue">4</biblScope><biblScope unit="page" from="295">295</biblScope><biblScope unit="page" to="304">304</biblScope></imprint></monogr><idno type="istex">3B3667B6E82C484BF2921F295F1A87C286E01AAE</idno><idno type="DOI">10.1002/1099-1530(200012)11:4<295::AID-PPP353>3.0.CO;2-L</idno><idno type="ArticleID">PPP353</idno></biblStruct></sourceDesc></fileDesc><profileDesc><creation><date>2000</date></creation><langUsage><language ident="en">en</language></langUsage><abstract xml:lang="en"><p>In the Bever Valley, Upper Engadine, eastern Swiss Alps, one‐dimensional DC resistivity soundings and two‐dimensional DC resistivity tomography were performed at a site where both GIS‐based modelling and measurements of the bottom temperature of the winter snow cover (BTS) suggest a potential permafrost occurrence at low altitude (1840 m ASL). The results of the geoelectric measurements indeed point to a permafrost occurrence below the timberline which consists of several thin permafrost lenses. In comparison with other Alpine permafrost sites the resistivities are fairly low which might be expected at a low altitude location with permafrost temperatures probably close to 0 °C. The active layer appears to be fairly thin which is surprising for a permafrost occurrence at mean annual air temperatures well above 0 °C. Here, the reduced radiation due to the topography as well as the organic layers are considered to play an important role in insulating the subsurface and controlling the ground thermal regime. The permafrost occurrence is assumed to be a result of the interaction of climatic conditions and topography as well as surface and subsurface factors. The application of resistivity measurements is shown to be a useful geophysical method as the organic layers provide good ground contact for the electrodes. Furthermore, the application of one‐dimensional DC resistivity soundings in combination with two‐dimensional DC resistivity tomography proves to be a useful tool for mapping and characterizing isolated permafrost occurrences on a small scale. Copyright © 2000 John Wiley & Sons, Ltd.</p></abstract><abstract xml:lang="fr"><p>Dans la vallée de la Bevers en Haute Engadine, à l'est des Alpes suisses, des sondages par résistivité DC à une dimension et des tomographies par résistivité DC à deux dimensions ont été réalisées à faible altitude (1840∼m) en un endroit où, à la fois des modèles obtenus par SIG et des measures de température à la base de la couverture de neige (BTS), ont suggéré l'occurrence probable d'un pergélisol. Les résultats des mesures géoélectriques ont indiqué la présence de plusieurs lentilles fines de pergélisol alors que on se trouve sous la limite des arbres. En comparaison avec d'autres sites où existe un pergélisol, les résistivités sont basses, ce qui pouvait être attendu en cet endroit où les températures du pergélisol sont probablement proches de 0 °C. La couche active paraît mince, ce qui est surprenant en ces endroits où la température moyenne annuelle est bien supérieure à 0 °C. Une radiation thermique réduite, due à la topographie, ainsi que la présence de couches organiques, sont probablement les facteurs importants qui isolent la surface et contrôlent le régime thermique du sol. La présence du pergélisol en cet endroit résulte de l'interaction entre les conditions climatiques, la topographie et plusieurs autres facteurs de surface et de faible profondeur. Les mesures de résistivité ont été ici excellentes parce que les couches organiques fournissent de bons contacts pour les électrodes. L'utilisation simultanée des sondages par résistivité DC à une dimension en combinaison avec des tomographies DC en deux dimensions constitute un outil utile pour cartographier et caractériser de petits îlots isolés de pergélisol. Copyright © 2000 John Wiley & Sons, Ltd.</p></abstract><textClass xml:lang="en"><keywords scheme="keyword"><list><head>keywords</head><item><term>DC resistivity soundings</term></item><item><term>sporadic mountain permafrost</term></item><item><term>Swiss Alps</term></item><item><term>timberline</term></item></list></keywords></textClass><textClass><keywords scheme="Journal Subject"><list><head>article-category</head><item><term>Research Article</term></item></list></keywords></textClass></profileDesc><revisionDesc><change when="1999-12-20">Received</change><change when="2000-06-14">Registration</change><change when="2000-12">Published</change></revisionDesc></teiHeader></istex:fulltextTEI><json:item><extension>txt</extension><original>false</original><mimetype>text/plain</mimetype><uri>https://api.istex.fr/document/3B3667B6E82C484BF2921F295F1A87C286E01AAE/fulltext/txt</uri></json:item></fulltext><metadata><istex:metadataXml wicri:clean="Wiley, elements deleted: body"><istex:xmlDeclaration>version="1.0" encoding="UTF-8" standalone="yes"</istex:xmlDeclaration><istex:document><component version="2.0" type="serialArticle" xml:lang="en"><header><publicationMeta level="product"><publisherInfo><publisherName>John Wiley & Sons, Ltd.</publisherName><publisherLoc>Chichester, UK</publisherLoc></publisherInfo><doi registered="yes">10.1002/(ISSN)1099-1530</doi><issn type="print">1045-6740</issn><issn type="electronic">1099-1530</issn><idGroup><id type="product" value="PPP"></id></idGroup><titleGroup><title type="main" xml:lang="en" sort="PERMAFROST AND PERIGLACIAL PROCESSES">Permafrost and Periglacial Processes</title><title type="short">Permafrost Periglac. 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The results of the geoelectric measurements indeed point to a permafrost occurrence below the timberline which consists of several thin permafrost lenses. In comparison with other Alpine permafrost sites the resistivities are fairly low which might be expected at a low altitude location with permafrost temperatures probably close to 0 °C. The active layer appears to be fairly thin which is surprising for a permafrost occurrence at mean annual air temperatures well above 0 °C. Here, the reduced radiation due to the topography as well as the organic layers are considered to play an important role in insulating the subsurface and controlling the ground thermal regime. The permafrost occurrence is assumed to be a result of the interaction of climatic conditions and topography as well as surface and subsurface factors. The application of resistivity measurements is shown to be a useful geophysical method as the organic layers provide good ground contact for the electrodes. Furthermore, the application of one‐dimensional DC resistivity soundings in combination with two‐dimensional DC resistivity tomography proves to be a useful tool for mapping and characterizing isolated permafrost occurrences on a small scale. Copyright © 2000 John Wiley & Sons, Ltd.</p></abstract><abstract type="main" xml:lang="fr"><title type="main">RÉSUMÉ</title><p>Dans la vallée de la Bevers en Haute Engadine, à l'est des Alpes suisses, des sondages par résistivité DC à une dimension et des tomographies par résistivité DC à deux dimensions ont été réalisées à faible altitude (1840∼m) en un endroit où, à la fois des modèles obtenus par SIG et des measures de température à la base de la couverture de neige (BTS), ont suggéré l'occurrence probable d'un pergélisol. Les résultats des mesures géoélectriques ont indiqué la présence de plusieurs lentilles fines de pergélisol alors que on se trouve sous la limite des arbres. En comparaison avec d'autres sites où existe un pergélisol, les résistivités sont basses, ce qui pouvait être attendu en cet endroit où les températures du pergélisol sont probablement proches de 0 °C. La couche active paraît mince, ce qui est surprenant en ces endroits où la température moyenne annuelle est bien supérieure à 0 °C. Une radiation thermique réduite, due à la topographie, ainsi que la présence de couches organiques, sont probablement les facteurs importants qui isolent la surface et contrôlent le régime thermique du sol.</p><p>La présence du pergélisol en cet endroit résulte de l'interaction entre les conditions climatiques, la topographie et plusieurs autres facteurs de surface et de faible profondeur. Les mesures de résistivité ont été ici excellentes parce que les couches organiques fournissent de bons contacts pour les électrodes. L'utilisation simultanée des sondages par résistivité DC à une dimension en combinaison avec des tomographies DC en deux dimensions constitute un outil utile pour cartographier et caractériser de petits îlots isolés de pergélisol. Copyright © 2000 John Wiley & Sons, Ltd.</p></abstract></abstractGroup></contentMeta></header></component></istex:document></istex:metadataXml><mods version="3.6"><titleInfo lang="en"><title>Permafrost below the Timberline Confirmed and Characterized by Geoelectrical Resistivity Measurements, Bever Valley, Eastern Swiss Alps</title></titleInfo><titleInfo type="abbreviated" lang="en"><title>Permafrost below the Timberline</title></titleInfo><titleInfo type="alternative" contentType="CDATA" lang="en"><title>Permafrost below the Timberline Confirmed and Characterized by Geoelectrical Resistivity Measurements, Bever Valley, Eastern Swiss Alps</title></titleInfo><name type="personal"><namePart type="given">Christof</namePart><namePart type="family">Kneisel</namePart><affiliation>Department of Physical Geography, Faculty of Geography and Geosciences, University of Trier, Germany</affiliation><affiliation>Faculty of Geography and Geosciences, University of Trier, D‐54286, Trier, Germany.</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">Christian</namePart><namePart type="family">Hauck</namePart><affiliation>Laboratory of Hydraulics, Hydrology and Glaciology, ETH‐Zurich, Switzerland</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">Daniel Vonder</namePart><namePart type="family">Mühll</namePart><affiliation>Laboratory of Hydraulics, Hydrology and Glaciology, ETH‐Zurich, Switzerland</affiliation><role><roleTerm type="text">author</roleTerm></role></name><typeOfResource>text</typeOfResource><genre type="article" displayLabel="article"></genre><originInfo><publisher>John Wiley & Sons, Ltd.</publisher><place><placeTerm type="text">Chichester, UK</placeTerm></place><dateIssued encoding="w3cdtf">2000-12</dateIssued><dateCaptured encoding="w3cdtf">1999-12-20</dateCaptured><dateValid encoding="w3cdtf">2000-06-14</dateValid><copyrightDate encoding="w3cdtf">2000</copyrightDate></originInfo><language><languageTerm type="code" authority="rfc3066">en</languageTerm><languageTerm type="code" authority="iso639-2b">eng</languageTerm></language><physicalDescription><internetMediaType>text/html</internetMediaType><extent unit="figures">6</extent><extent unit="tables">2</extent><extent unit="references">47</extent></physicalDescription><abstract lang="en">In the Bever Valley, Upper Engadine, eastern Swiss Alps, one‐dimensional DC resistivity soundings and two‐dimensional DC resistivity tomography were performed at a site where both GIS‐based modelling and measurements of the bottom temperature of the winter snow cover (BTS) suggest a potential permafrost occurrence at low altitude (1840 m ASL). The results of the geoelectric measurements indeed point to a permafrost occurrence below the timberline which consists of several thin permafrost lenses. In comparison with other Alpine permafrost sites the resistivities are fairly low which might be expected at a low altitude location with permafrost temperatures probably close to 0 °C. The active layer appears to be fairly thin which is surprising for a permafrost occurrence at mean annual air temperatures well above 0 °C. Here, the reduced radiation due to the topography as well as the organic layers are considered to play an important role in insulating the subsurface and controlling the ground thermal regime. The permafrost occurrence is assumed to be a result of the interaction of climatic conditions and topography as well as surface and subsurface factors. The application of resistivity measurements is shown to be a useful geophysical method as the organic layers provide good ground contact for the electrodes. Furthermore, the application of one‐dimensional DC resistivity soundings in combination with two‐dimensional DC resistivity tomography proves to be a useful tool for mapping and characterizing isolated permafrost occurrences on a small scale. Copyright © 2000 John Wiley & Sons, Ltd.</abstract><abstract lang="fr">Dans la vallée de la Bevers en Haute Engadine, à l'est des Alpes suisses, des sondages par résistivité DC à une dimension et des tomographies par résistivité DC à deux dimensions ont été réalisées à faible altitude (1840∼m) en un endroit où, à la fois des modèles obtenus par SIG et des measures de température à la base de la couverture de neige (BTS), ont suggéré l'occurrence probable d'un pergélisol. Les résultats des mesures géoélectriques ont indiqué la présence de plusieurs lentilles fines de pergélisol alors que on se trouve sous la limite des arbres. En comparaison avec d'autres sites où existe un pergélisol, les résistivités sont basses, ce qui pouvait être attendu en cet endroit où les températures du pergélisol sont probablement proches de 0 °C. La couche active paraît mince, ce qui est surprenant en ces endroits où la température moyenne annuelle est bien supérieure à 0 °C. Une radiation thermique réduite, due à la topographie, ainsi que la présence de couches organiques, sont probablement les facteurs importants qui isolent la surface et contrôlent le régime thermique du sol. La présence du pergélisol en cet endroit résulte de l'interaction entre les conditions climatiques, la topographie et plusieurs autres facteurs de surface et de faible profondeur. Les mesures de résistivité ont été ici excellentes parce que les couches organiques fournissent de bons contacts pour les électrodes. L'utilisation simultanée des sondages par résistivité DC à une dimension en combinaison avec des tomographies DC en deux dimensions constitute un outil utile pour cartographier et caractériser de petits îlots isolés de pergélisol. Copyright © 2000 John Wiley & Sons, Ltd.</abstract><note type="funding">Forschungsfonds der Universität Trier.</note><note type="funding">PACE - No. EU ENV4‐CT97‐0492; No. BBW 97.0054‐1.; </note><subject lang="en"><genre>keywords</genre><topic>DC resistivity soundings</topic><topic>sporadic mountain permafrost</topic><topic>Swiss Alps</topic><topic>timberline</topic></subject><relatedItem type="host"><titleInfo><title>Permafrost and Periglacial Processes</title></titleInfo><titleInfo type="abbreviated"><title>Permafrost Periglac. 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