{"id":2818,"date":"2025-01-27T15:23:06","date_gmt":"2025-01-27T14:23:06","guid":{"rendered":"https:\/\/devw.isska.ch\/?page_id=2818"},"modified":"2025-01-29T09:17:07","modified_gmt":"2025-01-29T08:17:07","slug":"thermokarst","status":"publish","type":"page","link":"https:\/\/devw.isska.ch\/en\/thermokarst\/","title":{"rendered":"Ther\u00admo\u00adKarst"},"content":{"rendered":"<ul>\n<li>\n        <a href=\"https:\/\/devw.isska.ch\/en\/who-we-are\/\">About us<\/a>\n    <\/li>\n<li>\n        <a href=\"https:\/\/devw.isska.ch\/en\/skills\/\">Com\u00adpe\u00adtences<\/a>\n    <\/li>\n<li>\n        <a href=\"https:\/\/devw.isska.ch\/en\/services\/\">Ser\u00advices<\/a>\n    <\/li>\n<\/ul>\n<h1>ThermoKarst<\/h1>\n<div>\n<div class=\"show-more-wrapper\">\n<div class=\"text-content\">\n<p>Under\u00adground cavi\u00adties are a fra\u00adgile eco\u00adsys\u00adtem in which bio\u00adgeo\u00adche\u00admi\u00adcal pro\u00adcesses are high\u00adly dependent on tem\u00adpe\u00adra\u00adture. They also contain unique traces of their past envi\u00adron\u00adment, the inter\u00adpre\u00adta\u00adtion of which is clo\u00adse\u00adly dependent on tem\u00adpe\u00adra\u00adture.<\/p>\n<p>In recent years, many stu\u00addies have focu\u00adsed on spe\u00adleo\u00adthems, secon\u00adda\u00adry car\u00adbo\u00adnate for\u00adma\u00adtions such as sta\u00adlag\u00admites and sta\u00adlag\u00admi\u00adtic flows, because of their abi\u00adli\u00adty to archive palaeoen\u00advi\u00adron\u00admen\u00adtal infor\u00adma\u00adtion that can be dated with pre\u00adci\u00adsion over the last 0.5 Ma or so. Seve\u00adral mecha\u00adnisms, inclu\u00adding ther\u00admal dif\u00adfu\u00adsion in the bedrock and advec\u00adtion by water and air, trans\u00adfer heat from the outer sur\u00adface to the cavi\u00adty. Depen\u00adding on the rela\u00adtive impor\u00adtance of these dif\u00adferent flows, the under\u00adground tem\u00adpe\u00adra\u00adture will be more or less atte\u00adnua\u00adted and out of phase in res\u00adponse to tem\u00adpo\u00adral varia\u00adtions in the out\u00adside tem\u00adpe\u00adra\u00adture.<\/p>\n<p>Unders\u00adtan\u00adding the ther\u00admal res\u00adponse of karst to cli\u00admate change is the\u00adre\u00adfore fun\u00adda\u00admen\u00adtal to quan\u00adti\u00adfying dissolution\/precipitation rates, inter\u00adpre\u00adting the geo\u00adche\u00admi\u00adcal varia\u00adtions obser\u00adved in concre\u00adtions and asses\u00adsing the impact on living orga\u00adnisms in caves.<\/p>\n<p><span class=\"more-text\"><br>\n<br>Based on the lite\u00adra\u00adture, we have for\u00admu\u00adla\u00adted three hypo\u00adtheses that we will seek to vali\u00addate in the pro\u00adject&nbsp;:<\/span><\/p>\n<ol>\n<li>Ven\u00adti\u00adla\u00adtion of kars\u00adtic mas\u00adsifs is a domi\u00adnant mecha\u00adnism for heat trans\u00adfer<\/li>\n<p><\/p>\n<li>The reac\u00adtion time of mas\u00adsifs and caves depends main\u00adly on advec\u00adtive flows (water and air), rather than on heat conduc\u00adtion in the rock.<\/li>\n<p><\/p>\n<li>Heat exchange is suf\u00adfi\u00adcient to pro\u00adduce a signi\u00adfi\u00adcant quan\u00adti\u00adty of conden\u00adsa\u00adtion water to recharge kars\u00adtic sys\u00adtems, at least under cer\u00adtain condi\u00adtions.<\/li>\n<\/ol>\n<p>\nThe aim of the pro\u00adject is to car\u00adry out an in-depth ana\u00adly\u00adsis of mass and heat trans\u00adfer in karst sys\u00adtems in order to ans\u00adwer these ques\u00adtions. In par\u00adti\u00adcu\u00adlar, we want to cha\u00adrac\u00adte\u00adrise the conse\u00adquences of cli\u00admate change on the under\u00adground envi\u00adron\u00adment and deter\u00admine the ther\u00admal res\u00adponse of a cavi\u00adty on dif\u00adferent spa\u00adtial and tem\u00adpo\u00adral scales. We will deve\u00adlop a sim\u00adpli\u00adfied glo\u00adbal model of kars\u00adtic mas\u00adsifs made up of seve\u00adral sub-sys\u00adtems (rock, conduit, epi\u00adkarst, etc.). Heat trans\u00adfer by conduc\u00adtion and advec\u00adtion (water and air) in the rock and conduits will be ful\u00adly cou\u00adpled. Howe\u00adver, the effects of natu\u00adral ven\u00adti\u00adla\u00adtion in the caves and of the epi\u00adkarst are not cur\u00adrent\u00adly well quan\u00adti\u00adfied, making their model\u00adling ris\u00adky. Field mea\u00adsu\u00adre\u00adments will the\u00adre\u00adfore be car\u00adried out in paral\u00adlel with the simu\u00adla\u00adtions.<\/p>\n<p>To achieve this objec\u00adtive, the pro\u00adject relies on two teams with com\u00adple\u00admen\u00adta\u00adry skills, one spe\u00adcia\u00adli\u00adsing in the moni\u00adto\u00adring and concep\u00adtua\u00adli\u00adsa\u00adtion of kars\u00adtic sys\u00adtems (SISKA), the other in heat and mass trans\u00adfer (FAST). These two aspects will the\u00adre\u00adfore be dealt with in paral\u00adlel. Ini\u00adtial\u00adly, a para\u00adme\u00adtric stu\u00addy (ini\u00adtial model) will be car\u00adried out using sim\u00adpli\u00adfied ana\u00adly\u00adti\u00adcal models to esti\u00admate the magni\u00adtude of the res\u00adpec\u00adtive pro\u00adcesses under dif\u00adferent condi\u00adtions. This will enable the content of the<br>\nfirst nume\u00adri\u00adcal model (part 1) and field data acqui\u00adsi\u00adtion (part 2). The two com\u00adpo\u00adnents will be syn\u00adthe\u00adsi\u00adsed ite\u00adra\u00adti\u00adve\u00adly throu\u00adghout the research pro\u00adgramme, enabling the three hypo\u00adtheses to be dis\u00adcus\u00adsed at the end. Two main sites will be ins\u00adtru\u00admen\u00adted, inclu\u00adding the Milandre under\u00adground labo\u00adra\u00adto\u00adry where a large amount of data is alrea\u00addy avai\u00adlable. The sites will be moni\u00adto\u00adred for tem\u00adpe\u00adra\u00adture and for the main para\u00adme\u00adters control\u00adling mass trans\u00adfer&nbsp;: air and water flows, using direct (flow rates) and indi\u00adrect (CO2 and radon) mea\u00adsu\u00adre\u00adments.<\/p>\n<p>A team of two PhD stu\u00addents is plan\u00adned to deploy the moni\u00adto\u00adring in the field and deve\u00adlop the skills and simu\u00adla\u00adtion tools nee\u00added for the pro\u00adject. Expe\u00adrien\u00adced resear\u00adchers from the SISKA and FAST will acti\u00adve\u00adly sup\u00adport the PhD stu\u00addents to<br>\nesta\u00adblish the pro\u00adce\u00addures, deve\u00adlop the skills and take the deci\u00adsions nee\u00added to resolve the chal\u00adlenges that lie ahead.<\/p>\n<p>This pro\u00adject will undoub\u00adted\u00adly pro\u00advide new infor\u00adma\u00adtion on the res\u00adponse of kars\u00adtic mas\u00adsifs to cli\u00admate change, on the ven\u00adti\u00adla\u00adtion of mas\u00adsifs and on the impor\u00adtance of conden\u00adsa\u00adtion in rechar\u00adging aqui\u00adfers.<\/p>\n<p>The results of the pro\u00adject will also pro\u00advide essen\u00adtial data for other fields&nbsp;: drin\u00adking water sup\u00adply (tem\u00adpe\u00adra\u00adture varia\u00adtions in kars\u00adtic springs), public health (radon exha\u00adled in dwel\u00adlings), spe\u00adleo\u00adge\u00adne\u00adsis (conden\u00adsa\u00adtion cor\u00adro\u00adsion), per\u00adma\u00adfrost (natu\u00adral gla\u00adciers), low-tem\u00adpe\u00adra\u00adture geo\u00adther\u00admal ener\u00adgy (effect of conduits on heat exchange), tun\u00adnel\u00adling and mining (pre\u00addic\u00adtion of voids and mas\u00adsive water intru\u00adsions), remote sen\u00adsing (inter\u00adpre\u00adta\u00adtion of ther\u00admal ano\u00adma\u00adlies), cave conser\u00adva\u00adtion (pro\u00adtec\u00adtion of archaeo\u00adlo\u00adgi\u00adcal and tou\u00adrist caves), the car\u00adbon cycle (dis\u00adso\u00adlu\u00adtion and pre\u00adci\u00adpi\u00adta\u00adtion of car\u00adbo\u00adnates are control\u00adled by pCO2, and the\u00adre\u00adfore by ven\u00adti\u00adla\u00adtion), sub\u00adter\u00adra\u00adnean bio\u00adlo\u00adgy (bio\u00adtopes, etc.).<br>\nunder\u00adground)\u2026<\/p>\n<p>The results of this pro\u00adject will become a key step in unders\u00adtan\u00adding heat trans\u00adfer in car\u00adbo\u00adnate rocks.<\/p>\n<p><span><a href=\"https:\/\/data.snf.ch\/grants\/grant\/188636\" data-wplink-url-error=\"true\" target=\"_blank\" rel=\"noopener\">Link to the SNSF Ther\u00admo\u00adkarst page<\/a><\/span><br>\n<br>\n     \t\n    <\/p><\/div>\n<p>    <button class=\"show-more-button\">Show more<\/button><\/p>\n<\/div>\n<p><img decoding=\"async\" src=\"\/wp-content\/uploads\/2024\/12\/domain_3-scaled.jpeg\" alt><br>\n<img decoding=\"async\" src=\"\/wp-content\/uploads\/2024\/12\/m0-scaled.jpg\" alt><\/p>\n<h1>PHD Students<\/h1>\n<div>\n<div>\n<h3 style=\"text-align: center;\">Contact<\/h3>\n<p style=\"text-align: center;\"><a href=\"https:\/\/devw.isska.ch\/wp-admin\/admin-ajax.php?action=kernel&amp;p=customizer&amp;site=https%3A%2F%2Fdevw.isska.ch%2Ffr%2Fcompetences%2Fformation-et-mediation%2F\" aria-label=\"Select Image\" class=\"uk-position-cover\"><\/a><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/devw.isska.ch\/wp-content\/uploads\/2024\/01\/Amir_nb-225x300.jpg\" alt width=\"225\" height=\"300\" class=\"alignnone wp-image-611 size-medium\" srcset=\"https:\/\/devw.isska.ch\/wp-content\/uploads\/2024\/01\/Amir_nb-225x300.jpg 225w, https:\/\/devw.isska.ch\/wp-content\/uploads\/2024\/01\/Amir_nb-768x1024.jpg 768w, https:\/\/devw.isska.ch\/wp-content\/uploads\/2024\/01\/Amir_nb-1152x1536.jpg 1152w, https:\/\/devw.isska.ch\/wp-content\/uploads\/2024\/01\/Amir_nb-1536x2048.jpg 1536w, https:\/\/devw.isska.ch\/wp-content\/uploads\/2024\/01\/Amir_nb-scaled.jpg 1920w\" sizes=\"auto, (max-width: 225px) 100vw, 225px\"><\/p>\n<p style=\"text-align: center;\">Amir Seda\u00adghat\u00adkish<br><a href=\"mailto:amir.sedaghatkish@isska.ch\">Send e\u2011mail<\/a><\/p>\n\n<\/div>\n<\/div>\n<div>\n<div>\n<h3 style=\"text-align: center;\">Contact<\/h3>\n<p style=\"text-align: center;\"><a href=\"https:\/\/devw.isska.ch\/wp-admin\/admin-ajax.php?action=kernel&amp;p=customizer&amp;site=https%3A%2F%2Fdevw.isska.ch%2Ffr%2Fcompetences%2Fformation-et-mediation%2F\" aria-label=\"Select Image\" class=\"uk-position-cover\"><\/a><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/devw.isska.ch\/wp-content\/uploads\/2024\/01\/Claudio_nb-225x300.jpg\" alt width=\"225\" height=\"300\" class=\"alignnone wp-image-612 size-medium\" srcset=\"https:\/\/devw.isska.ch\/wp-content\/uploads\/2024\/01\/Claudio_nb-225x300.jpg 225w, https:\/\/devw.isska.ch\/wp-content\/uploads\/2024\/01\/Claudio_nb.jpg 532w\" sizes=\"auto, (max-width: 225px) 100vw, 225px\"><\/p>\n<p style=\"text-align: center;\">Clau\u00addio Pas\u00adtore<br><a href=\"mailto:claudio.pastore@isska.ch\">Send e\u2011mail<\/a><\/p>\n\n<\/div>\n<\/div>\n<h1>PIs<\/h1>\n<div>\n<p><span>Pierre-Yves Jean\u00adnin (ISSKA), Fr\u00e9\u00add\u00e9\u00adric Dou\u00admenc (Sor\u00adbonne), Marc Luet\u00adscher (ISSKA).<\/span><\/p>\n<\/div>\n<h1>Publications<\/h1>\n<div>\n<p class><span lang=\"EN-US\">Seda\u00adghat\u00adkish A., Dou\u00admenc F., Jean\u00adnin PY.,<span>&nbsp;<\/span><span>Luet\u00adscher M.<\/span>, 2024. Mode\u00adling the effect of free convec\u00adtion on per\u00adma\u00adfrost mel\u00adting rates in fro\u00adzen rock-clefts.<span>&nbsp;<\/span><i>The Cryos\u00adpher<\/i>e, 18, 4547\u20134565,<span>&nbsp;<\/span><a class=\"defaultMailLink defaultMailLink\" href=\"http:\/\/doi.org\/10.5194\/tc-18-4547-2024\" target=\"_blank\" rel=\"noopener noreferrer\" data-ik=\"ik-secure\">doi.org\/10.5194\/tc-18\u20134547-2024<\/a><\/span><\/p>\n<p class><span lang=\"EN-US\">Pas\u00adtore C., Seda\u00adghat\u00adkish A., Schmid N., Weber E.,<span>&nbsp;<\/span><span>Luet\u00adscher M.<\/span>, 2024. Moni\u00adto\u00adring air fluxes in caves using digi\u00adtal flow meters.<span>&nbsp;<\/span><i>Inter\u00adna\u00adtio\u00adnal Jour\u00adnal of Spe\u00adleo\u00adlo\u00adgy, 53, 63\u201373.<span>&nbsp;<\/span><\/i><a class=\"defaultMailLink defaultMailLink\" href=\"http:\/\/doi.org\/10.5038\/1827-806X.53.1.2500\" target=\"_blank\" rel=\"noopener noreferrer\" data-ik=\"ik-secure\">doi.org\/10.5038\/1827\u2013806X.53.1.2500<\/a><\/span><\/p>\n<p class><span lang=\"EN-US\">Seda\u00adghat\u00adkish A., Pas\u00adtore C., Dou\u00admenc F., Jean\u00adnin PY.,<span>&nbsp;<\/span><span>Luet\u00adscher M.<\/span>, 2024. Model\u00adling heat trans\u00adfer for asses\u00adsing the convec\u00adtion length in ven\u00adti\u00adla\u00adted caves.<span>&nbsp;<\/span><i>Jour\u00adnal of Geo\u00adphy\u00adsi\u00adcal Research&nbsp;: Earth Sur\u00adface<\/i>129, e2024JF007646.<\/span><span lang=\"EN-US\"><span>&nbsp;<\/span><\/span><span lang=\"FR\"><a class=\"defaultMailLink\" href=\"https:\/\/doi.org\/10.1029\/2024JF007646\" target=\"_blank\" rel=\"noopener noreferrer\" data-ik=\"ik-secure\"><span lang=\"EN-US\">doi.org\/10.1029\/2024JF007646<\/span><\/a><\/span><span lang=\"EN-US\"><\/span><\/p>\n<p class><span lang=\"EN-US\">Pas\u00adtore C., Weber E., Dou\u00admenc F., Jean\u00adnin PY.,<span>&nbsp;<\/span><span>Luet\u00adscher M.<\/span>, 2024. Dis\u00adper\u00adsion of arti\u00adfi\u00adcial tra\u00adcers in ven\u00adti\u00adla\u00adted caves.<span>&nbsp;<\/span><i>Inter\u00adna\u00adtio\u00adnal Jour\u00adnal of Spe\u00adleo\u00adlo\u00adgy<\/i>, 53(1), 51\u201362.<span>&nbsp;<\/span><a class=\"defaultMailLink defaultMailLink\" href=\"http:\/\/doi.org\/10.5038\/1827-806X.53.1.2497\" target=\"_blank\" rel=\"noopener noreferrer\" data-ik=\"ik-secure\">doi.org\/10.5038\/1827\u2013806X.53.1.2497<\/a><\/span><\/p>\n<p class><span lang=\"EN-US\">Gara\u00adgnon J.,<span>&nbsp;<\/span><span>Luet\u00adscher M.<\/span>Weber E., 2022. Ven\u00adti\u00adla\u00adtion regime in a kars\u00adtic sys\u00adtem (Milandre Cave, Swit\u00adzer\u00adland).<span>&nbsp;<\/span><i>Kars\u00adto\u00adlo\u00adgia Memoirs<\/i>, 23, 187\u201319<\/span><\/p>\n<\/div>\n<p><!--more--><br>\n<!-- {\"type\":\"layout\",\"children\":[{\"type\":\"section\",\"props\":{\"css\":\"@media (max-width:759px) {\\n  .el-section {\\n      height: 370px;\\n    }\\n}\\n@media (min-width:760px) {\\n    .el-section {\\n        height: 275px;\\n    }\\n}\\n@media (min-width:1200px) {\\n    .el-section {\\n        height: 340px;\\n    }\\n}\\n@media (min-width:1600px) {\\n    .el-section {\\n        height: 580px;\\n    }\\n}\\n@media (min-width:1600px) and (max-height:1100px) {\\n    .el-section {\\n        height: 460px;\\n    }\\n}\",\"image\":\"wp-content\\\/uploads\\\/2024\\\/01\\\/CreteVaas_2023_RW_5-scaled.jpg\",\"image_position\":\"center-center\",\"image_size\":\"cover\",\"padding\":\"large\",\"style\":\"default\",\"title_breakpoint\":\"xl\",\"title_position\":\"top-left\",\"title_rotation\":\"left\",\"vertical_align\":\"middle\",\"width\":\"default\"},\"children\":[{\"type\":\"row\",\"children\":[{\"type\":\"column\",\"props\":{\"image_position\":\"center-center\",\"position_sticky_breakpoint\":\"m\"},\"children\":[{\"type\":\"button\",\"props\":{\"css\":\".el-content {\\n    font-family: \\\"Century Gothic\\\", Verdana, sans-serif;\\n    }\\n@media (max-width:759px) {\\n  .el-content {\\n    margin: 10px 50px; \\n    width: 250px;\\n    position: relative;\\n    top: 180px;\\n  }\\n}\\n@media (min-width:760px) {\\n  .el-content {\\n    margin: 10px 6px; \\n    width: 217px;\\n    position: relative;\\n    top: 104px;\\n  }\\n}\\n@media (min-width:1200px) {\\n  .el-content {\\n    width: 260px;\\n    margin: 0px 40px;\\n    position: relative;\\n    top: 165px;\\n  }\\n}\\n@media (min-width:1600px) {\\n  .el-content {\\n    margin-top: 250px;\\n }\\n} \\n@media (min-width:1600px) and (max-height:1100px) {\\n  .el-content {\\n    margin-top: 130px;\\n }\\n} \",\"fullwidth\":false,\"grid_column_gap\":\"collapse\",\"grid_row_gap\":\"small\",\"margin\":\"default\",\"position_bottom\":\"-93\",\"position_z_index\":\"2\",\"text_align\":\"center\"},\"children\":[{\"type\":\"button_item\",\"props\":{\"button_style\":\"primary\",\"content\":\"Qui sommes-nous?\",\"icon_align\":\"left\",\"link\":\"https:\\\/\\\/devw.isska.ch\\\/qui-sommes-nous\"}},{\"type\":\"button_item\",\"props\":{\"button_style\":\"primary\",\"content\":\"Comp\\u00e9tences\",\"icon_align\":\"left\",\"link\":\"https:\\\/\\\/devw.isska.ch\\\/competences\\\/\"}},{\"type\":\"button_item\",\"props\":{\"button_style\":\"primary\",\"content\":\"Prestations\",\"icon_align\":\"left\",\"link\":\"https:\\\/\\\/devw.isska.ch\\\/prestations\\\/\"}}]}]}]}],\"name\":\"Header_fr\"},{\"type\":\"section\",\"props\":{\"css\":\"@media (max-width: 759px) {\\n    .el-row {\\n        padding-top: 135px;\\n    }\\n}\\n@media (max-width: 759px) and (orientation:landscape) {\\n    .el-row {\\n        padding-top: 140px;\\n    }\\n}\",\"image_position\":\"center-center\",\"style\":\"default\",\"title_breakpoint\":\"xl\",\"title_position\":\"top-left\",\"title_rotation\":\"left\",\"vertical_align\":\"middle\",\"width\":\"default\"},\"children\":[{\"type\":\"row\",\"children\":[{\"type\":\"column\",\"props\":{\"image_position\":\"center-center\",\"position_sticky_breakpoint\":\"m\"},\"children\":[{\"type\":\"breadcrumbs\",\"props\":{\"show_current\":true,\"show_home\":true,\"visibility\":\"s\"},\"name\":\"Breadcrumbs\"},{\"type\":\"headline\",\"props\":{\"content\":\"ThermoKarst\",\"title_element\":\"h1\"},\"name\":\"Titre\"},{\"type\":\"html\",\"props\":{\"content\":\"\n\n<div class=\\\"show-more-wrapper\\\">\\n    \n\n<div class=\\\"text-content\\\">\\n        \n\n<p>Les cavit\\u00e9s souterraines constituent un \\u00e9cosyst\\u00e8me fragile dans lequel les processus biog\\u00e9ochimiques d\\u00e9pendent fortement de la temp\\u00e9rature. Elles abritent \\u00e9galement des traces uniques de leur environnement pass\\u00e9 dont l\\u2019interpr\\u00e9tation d\\u00e9pend \\u00e9troitement de la temp\\u00e9rature.<br \/>\\n<br \/>Au cours des derni\\u00e8res ann\\u00e9es, beaucoup d\\u2019\\u00e9tudes ont port\\u00e9 sur les sp\\u00e9l\\u00e9oth\\u00e8mes, formations carbonat\\u00e9es secondaires telles que stalagmites et coul\\u00e9es stalagmitiques, en raison de leur capacit\\u00e9 \\u00e0 archiver des informations pal\\u00e9oenvironnementales que l\\u2019on peut dater avec pr\\u00e9cision, sur les derniers 0.5 Ma environ. Plusieurs m\\u00e9canismes, dont la diffusion thermique dans l\\u2019encaissant rocheux et l\\u2019advection par l\\u2019eau et l\\u2019air, transf\\u00e8rent de la chaleur de la surface ext\\u00e9rieure vers la cavit\\u00e9. En fonction de l\\u2019importance relative de ces diff\\u00e9rents flux, la temp\\u00e9rature souterraine sera plus ou moins att\\u00e9nu\\u00e9e et d\\u00e9phas\\u00e9e en r\\u00e9ponse aux variations temporelles de la temp\\u00e9rature ext\\u00e9rieure.<br \/>\\n<br \/>Bien comprendre la r\\u00e9ponse thermique du karst au changement climatique est donc fondamental pour quantifier les taux de dissolution\\\/pr\\u00e9cipitation et interpr\\u00e9ter les variations g\\u00e9ochimiques observ\\u00e9es dans les concr\\u00e9tions, et pour \\u00e9valuer les impacts sur les organismes vivants dans les grottes.<br \/><\\\/p>\\n<span class=\\\"more-text\\\">\\n<br \/>A partir de la litt\\u00e9rature, nous avons formul\\u00e9 trois hypoth\\u00e8ses que nous chercherons \\u00e0 valider dans le projet :\\n\n\n<ol>   \\n\n\n<li>La ventilation des massifs karstiques repr\\u00e9sente un m\\u00e9canisme dominant pour le transfert de chaleur<\\\/li><br \/>\\n\n\n<li>Le temps de r\\u00e9action des massifs et des grottes d\\u00e9pend principalement des flux advectifs (eau et air), plus que de la conduction de chaleur dans la roche<\\\/li><br \/>\\n\n\n<li>Les \\u00e9changes thermiques sont suffisants pour produire une quantit\\u00e9 significative d\\u2019eau de condensation pour recharger les syst\\u00e8mes karstiques, au-moins dans certaines conditions.<\\\/li>\\n<\\\/ol><br \/>\\nL\\u2019objectif du projet est d\\u2019effectuer une analyse approfondie des transferts de masse et de chaleur dans les syst\\u00e8mes karstiques pour r\\u00e9pondre \\u00e0 ces questions. En particulier nous souhaitons caract\\u00e9riser les cons\\u00e9quences d\\u2019un changement climatique sur le milieu souterrain et d\\u00e9terminer la r\\u00e9ponse thermique d\\u2019une cavit\\u00e9 \\u00e0 diff\\u00e9rentes \\u00e9chelles spatiales et temporelles. Nous d\\u00e9velopperons un mod\\u00e8le global simplifi\\u00e9 des massifs karstiques constitu\\u00e9 de plusieurs sous-syst\\u00e8mes (roche, conduit, \\u00e9pikarst\\u2026). Les transferts de chaleur par conduction et advection (eau et air) dans la roche et les conduits seront enti\\u00e8rement coupl\\u00e9s. Cependant, les effets de la ventilation naturelle des grottes, et de l\\u2019\\u00e9pikarst ne sont actuellement pas bien quantifi\\u00e9s, rendant leur mod\\u00e9lisation hasardeuse. Des mesures de terrain seront donc men\\u00e9es parall\\u00e8lement aux simulations.<br \/>\\n\\n <br \/>Pour atteindre cet objectif, le projet s\\u2019appuie sur deux \\u00e9quipes aux comp\\u00e9tences compl\\u00e9mentaires, l\\u2019une sp\\u00e9cialiste du monitoring et de la conceptualisation des syst\\u00e8mes karstiques (ISSKA), l\\u2019autre des transferts de chaleur et de masse (FAST). Ces deux volets seront donc trait\\u00e9s en parall\\u00e8le. Au d\\u00e9but, une \\u00e9tude param\\u00e9trique (mod\\u00e8le initial) sera men\\u00e9e avec des mod\\u00e8les analytiques simplifi\\u00e9s afin d\\u2019estimer la magnitude des processus respectifs sous diff\\u00e9rentes conditions. Ceci permettra de pr\\u00e9ciser le contenu du\\npremier mod\\u00e8le num\\u00e9rique (volet 1) et de l\\u2019acquisition des donn\\u00e9es sur le terrain (volet 2). Les deux volets seront synth\\u00e9tis\\u00e9s it\\u00e9rativement tout au long du programme de recherche, ce qui permettra de discuter les trois hypoth\\u00e8ses \\u00e0 la fin. Deux sites principaux seront instrument\\u00e9s incluant le laboratoire souterrain de Milandre o\\u00f9 de nombreuses donn\\u00e9es sont d\\u00e9j\\u00e0 disponibles. Les sites seront monitor\\u00e9s en temp\\u00e9rature ainsi que pour les principaux param\\u00e8tres contr\\u00f4lant le transfert de masse : flux d\\u2019air et d\\u2019eau en utilisant des mesures directes (d\\u00e9bits) et indirectes (CO2 et radon).<br \/>\\n\\n<br \/>Une \\u00e9quipe de deux doctorants est pr\\u00e9vue pour d\\u00e9ployer le monitoring sur le terrain et d\\u00e9velopper les comp\\u00e9tence et outils de simulation n\\u00e9cessaires au projet. Les chercheurs exp\\u00e9riment\\u00e9s de l\\u2019ISSKA et du FAST soutiendront activement les doctorants pour\\n\\u00e9tablir les proc\\u00e9dures, d\\u00e9velopper les comp\\u00e9tences et prendre les d\\u00e9cisions n\\u00e9cessaires \\u00e0 r\\u00e9soudre les d\\u00e9fis qui se pr\\u00e9senteront.<br \/>\\n\\n<br \/>Ce projet apportera incontestablement des informations nouvelles sur la r\\u00e9ponse des massifs karstiques aux changements climatiques, sur la ventilation des massifs et sur l\\u2019importance de la condensation pour la recharge des aquif\\u00e8res.<br \/>\\n\\n <br \/>Les r\\u00e9sultats du projet apporteront aussi des donn\\u00e9es essentielles pour d\\u2019autres domaines : l\\u2019alimentation en eau potable (variations de temp\\u00e9rature des sources karstiques), sant\\u00e9 publique (radon exhal\\u00e9 dans les habitations), la sp\\u00e9l\\u00e9ogen\\u00e8se (corrosion par condensation), le permafrost (glaci\\u00e8res naturelles), la g\\u00e9othermie basse temp\\u00e9rature (effet des conduits sur les \\u00e9changes thermiques), le percement de tunnels et de mines (pr\\u00e9diction de vides et d\\u2019intrusions massives d\\u2019eau), la t\\u00e9l\\u00e9d\\u00e9tection (interpr\\u00e9tation d\\u2019anomalies thermiques), la conservation des grottes (protection des grottes arch\\u00e9ologiques et touristiques), le cycle du carbone (la dissolution et la pr\\u00e9cipitation des carbonates sont contr\\u00f4l\\u00e9es par la pCO2, donc par la ventilation), la biologie souterraine (biotopes\\nsouterrains)\\u2026<br \/>\\n\\n<br \/>Les r\\u00e9sultats de ce projet deviendront une \\u00e9tape-cl\\u00e9 dans la compr\\u00e9hension des transferts de chaleur dans les roches carbonat\\u00e9es.\\n<br \/>\\n<br \/>\\n<span><a href=\\\"https:\\\/\\\/data.snf.ch\\\/grants\\\/grant\\\/188636\\\" data-wplink-url-error=\\\"true\\\" target=\\\"_blank\\\" rel=\\\"noopener\\\">Lien vers la page FNS Thermokarst<\\\/a><\\\/span>\\n<\\\/span>\\n     \\t<\\\/span>\\n    <\\\/div>\\n    <button class=\\\"show-more-button\\\">Show more<\\\/button>\\n\\n\"}},{\"type\":\"image\",\"props\":{\"image\":\"wp-content\\\/uploads\\\/2024\\\/12\\\/domain_3-scaled.jpeg\",\"image_svg_color\":\"emphasis\",\"margin\":\"default\"}},{\"type\":\"image\",\"props\":{\"image\":\"wp-content\\\/uploads\\\/2024\\\/12\\\/m0-scaled.jpg\",\"image_svg_color\":\"emphasis\",\"margin\":\"default\"}}]}]},{\"type\":\"row\",\"children\":[{\"type\":\"column\",\"props\":{\"image_position\":\"center-center\",\"position_sticky_breakpoint\":\"m\"},\"children\":[{\"type\":\"headline\",\"props\":{\"content\":\"PHD Students\",\"title_element\":\"h1\"}},{\"type\":\"fragment\",\"props\":{\"margin\":\"default\"},\"children\":[{\"type\":\"row\",\"props\":{\"layout\":\"1-2,1-2\"},\"children\":[{\"type\":\"column\",\"props\":{\"image_position\":\"center-center\",\"position_sticky_breakpoint\":\"m\",\"width_medium\":\"1-2\"},\"children\":[{\"type\":\"panel\",\"props\":{\"content\":\"\n\n<h3 style=\\\"text-align: center;\\\"><br \\\/>Contact<\\\/h3>\\n\n\n<p style=\\\"text-align: center;\\\"><a href=\\\"https:\\\/\\\/devw.isska.ch\\\/wp-admin\\\/admin-ajax.php?action=kernel&amp;p=customizer&amp;site=https%3A%2F%2Fdevw.isska.ch%2Ffr%2Fcompetences%2Fformation-et-mediation%2F\\\" aria-label=\\\"Select Image\\\" class=\\\"uk-position-cover\\\"><\\\/a><img src=\\\"https:\\\/\\\/devw.isska.ch\\\/wp-content\\\/uploads\\\/2024\\\/01\\\/Amir_nb-225x300.jpg\\\" alt=\\\"\\\" width=\\\"225\\\" height=\\\"300\\\" class=\\\"alignnone wp-image-611 size-medium\\\" \\\/><\\\/p>\\n\n\n<p style=\\\"text-align: center;\\\">Amir Sedaghatkish<br \\\/><a href=\\\"mailto:amir.sedaghatkish@isska.ch\\\">Envoyer e-mail<\\\/a><\\\/p>\\n\n\n<p><\\\/p>\",\"content_column_breakpoint\":\"m\",\"css\":\".el-element {\\n    text-align: justify;\\n    font-family: 'Century Gothic', Verdana, sans-serif;\\n\\n}\",\"icon_width\":80,\"image\":\"\",\"image_align\":\"top\",\"image_grid_breakpoint\":\"m\",\"image_grid_width\":\"1-2\",\"image_svg_color\":\"emphasis\",\"image_width\":200,\"link_style\":\"default\",\"link_text\":\"Read more\",\"margin\":\"default\",\"meta_align\":\"below-title\",\"meta_element\":\"div\",\"meta_style\":\"text-meta\",\"panel_style\":\"card-default\",\"title_align\":\"top\",\"title_element\":\"h3\",\"title_grid_breakpoint\":\"m\",\"title_grid_width\":\"1-2\",\"title_hover_style\":\"reset\"},\"name\":\"Contact_Comp\"}]},{\"type\":\"column\",\"props\":{\"image_position\":\"center-center\",\"position_sticky_breakpoint\":\"m\",\"width_medium\":\"1-2\"},\"children\":[{\"type\":\"panel\",\"props\":{\"content\":\"\n\n<h3 style=\\\"text-align: center;\\\"><br \\\/>Contact<\\\/h3>\\n\n\n<p style=\\\"text-align: center;\\\"><a href=\\\"https:\\\/\\\/devw.isska.ch\\\/wp-admin\\\/admin-ajax.php?action=kernel&amp;p=customizer&amp;site=https%3A%2F%2Fdevw.isska.ch%2Ffr%2Fcompetences%2Fformation-et-mediation%2F\\\" aria-label=\\\"Select Image\\\" class=\\\"uk-position-cover\\\"><\\\/a><img src=\\\"https:\\\/\\\/devw.isska.ch\\\/wp-content\\\/uploads\\\/2024\\\/01\\\/Claudio_nb-225x300.jpg\\\" alt=\\\"\\\" width=\\\"225\\\" height=\\\"300\\\" class=\\\"alignnone wp-image-612 size-medium\\\" \\\/><\\\/p>\\n\n\n<p style=\\\"text-align: center;\\\">Claudio Pastore<br \\\/><a href=\\\"mailto:claudio.pastore@isska.ch\\\">Envoyer e-mail<\\\/a><\\\/p>\\n\n\n<p><\\\/p>\",\"content_column_breakpoint\":\"m\",\"css\":\".el-element {\\n    text-align: justify;\\n    font-family: 'Century Gothic', Verdana, sans-serif;\\n\\n}\",\"icon_width\":80,\"image\":\"\",\"image_align\":\"top\",\"image_grid_breakpoint\":\"m\",\"image_grid_width\":\"1-2\",\"image_svg_color\":\"emphasis\",\"image_width\":200,\"link_style\":\"default\",\"link_text\":\"Read more\",\"margin\":\"default\",\"meta_align\":\"below-title\",\"meta_element\":\"div\",\"meta_style\":\"text-meta\",\"panel_style\":\"card-default\",\"title_align\":\"top\",\"title_element\":\"h3\",\"title_grid_breakpoint\":\"m\",\"title_grid_width\":\"1-2\",\"title_hover_style\":\"reset\"},\"name\":\"Contact_Comp\"}]}]}]}]}]},{\"type\":\"row\",\"children\":[{\"type\":\"column\",\"props\":{\"image_position\":\"center-center\",\"position_sticky_breakpoint\":\"m\"},\"children\":[{\"type\":\"headline\",\"props\":{\"content\":\"PIs\",\"title_element\":\"h1\"}},{\"type\":\"text\",\"props\":{\"column_breakpoint\":\"m\",\"content\":\"\n\n<p><span>Pierre-Yves Jeannin (ISSKA), Fr\\u00e9d\\u00e9ric Doumenc (Sorbonne), Marc Luetscher (ISSKA).<\\\/span><\\\/p>\",\"margin\":\"default\"}}]}]},{\"type\":\"row\",\"children\":[{\"type\":\"column\",\"props\":{\"image_position\":\"center-center\",\"position_sticky_breakpoint\":\"m\"},\"children\":[{\"type\":\"headline\",\"props\":{\"content\":\"Publications\",\"title_element\":\"h1\"}},{\"type\":\"text\",\"props\":{\"column_breakpoint\":\"m\",\"content\":\"\n\n<p class=\\\"\\\"><span lang=\\\"EN-US\\\">Sedaghatkish A., Doumenc F., Jeannin PY.,<span>\\u00a0<\\\/span><span>Luetscher M.<\\\/span>, 2024. Modeling the effect of free convection on permafrost melting rates in frozen rock-clefts.<span>\\u00a0<\\\/span><i>The Cryospher<\\\/i>e, 18, 4547\\u20134565,<span>\\u00a0<\\\/span><a class=\\\"defaultMailLink defaultMailLink\\\" href=\\\"http:\\\/\\\/doi.org\\\/10.5194\\\/tc-18-4547-2024\\\" target=\\\"_blank\\\" rel=\\\"noopener noreferrer\\\" data-ik=\\\"ik-secure\\\">doi.org\\\/10.5194\\\/tc-18-4547-2024<\\\/a><\\\/span><\\\/p>\\n\n\n<p class=\\\"\\\"><span lang=\\\"EN-US\\\">Pastore C., Sedaghatkish A., Schmid N., Weber E.,<span>\\u00a0<\\\/span><span>Luetscher M.<\\\/span>, 2024. Monitoring air fluxes in caves using digital flow meters.<span>\\u00a0<\\\/span><i>International Journal of Speleology, 53, 63-73.<span>\\u00a0<\\\/span><\\\/i><a class=\\\"defaultMailLink defaultMailLink\\\" href=\\\"http:\\\/\\\/doi.org\\\/10.5038\\\/1827-806X.53.1.2500\\\" target=\\\"_blank\\\" rel=\\\"noopener noreferrer\\\" data-ik=\\\"ik-secure\\\">doi.org\\\/10.5038\\\/1827-806X.53.1.2500<\\\/a><\\\/span><\\\/p>\\n\n\n<p class=\\\"\\\"><span lang=\\\"EN-US\\\">Sedaghatkish A., Pastore C., Doumenc F., Jeannin PY.,<span>\\u00a0<\\\/span><span>Luetscher M.<\\\/span>, 2024. Modelling heat transfer for assessing the convection length in ventilated caves.<span>\\u00a0<\\\/span><i>Journal of Geophysical Research: Earth Surface<\\\/i>, 129, e2024JF007646.<\\\/span><span lang=\\\"EN-US\\\"><span>\\u00a0<\\\/span><\\\/span><span lang=\\\"FR\\\"><a class=\\\"defaultMailLink\\\" href=\\\"https:\\\/\\\/doi.org\\\/10.1029\\\/2024JF007646\\\" target=\\\"_blank\\\" rel=\\\"noopener noreferrer\\\" data-ik=\\\"ik-secure\\\"><span lang=\\\"EN-US\\\">doi.org\\\/10.1029\\\/2024JF007646<\\\/span><\\\/a><\\\/span><span lang=\\\"EN-US\\\"><\\\/span><\\\/p>\\n\n\n<p class=\\\"\\\"><span lang=\\\"EN-US\\\">Pastore C., Weber E., Doumenc F., Jeannin PY.,<span>\\u00a0<\\\/span><span>Luetscher M.<\\\/span>, 2024. Dispersion of artificial tracers in ventilated caves.<span>\\u00a0<\\\/span><i>International Journal of Speleology<\\\/i>, 53(1), 51-62.<span>\\u00a0<\\\/span><a class=\\\"defaultMailLink defaultMailLink\\\" href=\\\"http:\\\/\\\/doi.org\\\/10.5038\\\/1827-806X.53.1.2497\\\" target=\\\"_blank\\\" rel=\\\"noopener noreferrer\\\" data-ik=\\\"ik-secure\\\">doi.org\\\/10.5038\\\/1827-806X.53.1.2497<\\\/a><\\\/span><\\\/p>\\n\n\n<p class=\\\"\\\"><span lang=\\\"EN-US\\\">Garagnon J.,<span>\\u00a0<\\\/span><span>Luetscher M.<\\\/span>, Weber E., 2022. Ventilation regime in a karstic system (Milandre Cave, Switzerland).<span>\\u00a0<\\\/span><i>Karstologia M\\u00e9moires<\\\/i>, 23, 187-19<\\\/span><\\\/p>\",\"margin\":\"default\"}}]}]}]}],\"version\":\"4.3.5\"} --><\/p><\/div>","protected":false},"excerpt":{"rendered":"<p>About Ther\u00admo\u00adKarst Com\u00adpe\u00adten\u00adcies Ther\u00admo\u00adKarst ser\u00advices Under\u00adground cavi\u00adties are a fra\u00adgile eco\u00adsys\u00adtem in which bio\u00adgeo\u00adche\u00admi\u00adcal pro\u00adcesses are high\u00adly dependent on tem\u00adpe\u00adra\u00adture. They also contain unique traces of their past envi\u00adron\u00adment, the inter\u00adpre\u00adta\u00adtion of which is clo\u00adse\u00adly dependent on tem\u00adpe\u00adra\u00adture. In recent years, many stu\u00addies have focu\u00adsed on spe\u00adleo\u00adthems, secon\u00adda\u00adry car\u00adbo\u00adnate for\u00adma\u00adtions such as [\u2026].<\/p>","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"wp_typography_post_enhancements_disabled":false,"footnotes":""},"categories":[],"tags":[],"class_list":["post-2818","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/devw.isska.ch\/en\/wp-json\/wp\/v2\/pages\/2818","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/devw.isska.ch\/en\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/devw.isska.ch\/en\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/devw.isska.ch\/en\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/devw.isska.ch\/en\/wp-json\/wp\/v2\/comments?post=2818"}],"version-history":[{"count":22,"href":"https:\/\/devw.isska.ch\/en\/wp-json\/wp\/v2\/pages\/2818\/revisions"}],"predecessor-version":[{"id":2982,"href":"https:\/\/devw.isska.ch\/en\/wp-json\/wp\/v2\/pages\/2818\/revisions\/2982"}],"wp:attachment":[{"href":"https:\/\/devw.isska.ch\/en\/wp-json\/wp\/v2\/media?parent=2818"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/devw.isska.ch\/en\/wp-json\/wp\/v2\/categories?post=2818"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/devw.isska.ch\/en\/wp-json\/wp\/v2\/tags?post=2818"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}