{"id":109845,"date":"2025-07-03T10:54:44","date_gmt":"2025-07-03T08:54:44","guid":{"rendered":"https:\/\/geosurveys.it\/?page_id=109845"},"modified":"2026-02-26T10:33:00","modified_gmt":"2026-02-26T09:33:00","slug":"time-domain-electromagnetic-method-tdem","status":"publish","type":"page","link":"https:\/\/geosurveys.it\/fr\/time-domain-electromagnetic-method-tdem\/","title":{"rendered":"Time-domain Electromagnetic method (TDEM)"},"content":{"rendered":"<div class=\"wpb-content-wrapper\"><p>[vc_row row_height_percent=\u00a0\u00bb100&Prime; back_color=\u00a0\u00bbcolor-jevc\u00a0\u00bb back_image=\u00a0\u00bb105059&Prime; kburns=\u00a0\u00bbyes\u00a0\u00bb overlay_color=\u00a0\u00bbcolor-jevc\u00a0\u00bb overlay_alpha=\u00a0\u00bb20&Prime; gutter_size=\u00a0\u00bb4&Prime; column_width_percent=\u00a0\u00bb100&Prime; shift_y=\u00a0\u00bb0&Prime; z_index=\u00a0\u00bb0&Prime; content_parallax=\u00a0\u00bb0&Prime; uncode_shortcode_id=\u00a0\u00bb594239&Prime; overlay_color_type=\u00a0\u00bbuncode-palette\u00a0\u00bb back_color_type=\u00a0\u00bbuncode-palette\u00a0\u00bb][vc_column column_width_percent=\u00a0\u00bb100&Prime; position_horizontal=\u00a0\u00bbleft\u00a0\u00bb position_vertical=\u00a0\u00bbmiddle\u00a0\u00bb gutter_size=\u00a0\u00bb3&Prime; style=\u00a0\u00bbdark\u00a0\u00bb overlay_alpha=\u00a0\u00bb50&Prime; shift_x=\u00a0\u00bb0&Prime; shift_y=\u00a0\u00bb0&Prime; shift_y_down=\u00a0\u00bb0&Prime; z_index=\u00a0\u00bb0&Prime; medium_width=\u00a0\u00bb0&Prime; mobile_width=\u00a0\u00bb0&Prime; width=\u00a0\u00bb1\/1&Prime; uncode_shortcode_id=\u00a0\u00bb704479&Prime;][vc_row_inner][vc_column_inner column_width_percent=\u00a0\u00bb100&Prime; gutter_size=\u00a0\u00bb3&Prime; style=\u00a0\u00bbdark\u00a0\u00bb overlay_alpha=\u00a0\u00bb50&Prime; shift_x=\u00a0\u00bb0&Prime; shift_y=\u00a0\u00bb0&Prime; shift_y_down=\u00a0\u00bb0&Prime; z_index=\u00a0\u00bb0&Prime; medium_width=\u00a0\u00bb0&Prime; mobile_width=\u00a0\u00bb0&Prime; width=\u00a0\u00bb1\/1&Prime; uncode_shortcode_id=\u00a0\u00bb103021&Prime;][vc_custom_heading heading_semantic=\u00a0\u00bbp\u00a0\u00bb text_size=\u00a0\u00bb\u00a0\u00bb text_weight=\u00a0\u00bb700&Prime; uncode_shortcode_id=\u00a0\u00bb107198&Prime;]M\u00c9THODES \u00c9LECTROMAGN\u00c9TIQUES[\/vc_custom_heading][vc_custom_heading heading_semantic=\u00a0\u00bbh1&Prime; text_font=\u00a0\u00bbfont-377884&Prime; text_size=\u00a0\u00bbh1&Prime; text_weight=\u00a0\u00bb500&Prime; css_animation=\u00a0\u00bbcurtain-words\u00a0\u00bb uncode_shortcode_id=\u00a0\u00bb132095&Prime;]Time-domain Electromagnetic method (TDEM)[\/vc_custom_heading][\/vc_column_inner][\/vc_row_inner][\/vc_column][\/vc_row][vc_row unlock_row_content=\u00a0\u00bbyes\u00a0\u00bb row_height_percent=\u00a0\u00bb0&Prime; override_padding=\u00a0\u00bbyes\u00a0\u00bb h_padding=\u00a0\u00bb2&Prime; top_padding=\u00a0\u00bb3&Prime; bottom_padding=\u00a0\u00bb0&Prime; overlay_alpha=\u00a0\u00bb50&Prime; gutter_size=\u00a0\u00bb3&Prime; column_width_percent=\u00a0\u00bb100&Prime; shift_y=\u00a0\u00bb0&Prime; z_index=\u00a0\u00bb0&Prime; content_parallax=\u00a0\u00bb0&Prime; uncode_shortcode_id=\u00a0\u00bb204319&Prime;][vc_column column_width_percent=\u00a0\u00bb100&Prime; gutter_size=\u00a0\u00bb3&Prime; overlay_alpha=\u00a0\u00bb50&Prime; shift_x=\u00a0\u00bb0&Prime; shift_y=\u00a0\u00bb0&Prime; shift_y_down=\u00a0\u00bb0&Prime; z_index=\u00a0\u00bb0&Prime; medium_width=\u00a0\u00bb0&Prime; mobile_width=\u00a0\u00bb0&Prime; width=\u00a0\u00bb1\/1&Prime; uncode_shortcode_id=\u00a0\u00bb149024&Prime;][vc_row_inner row_inner_height_percent=\u00a0\u00bb0&Prime; overlay_alpha=\u00a0\u00bb50&Prime; gutter_size=\u00a0\u00bb3&Prime; shift_y=\u00a0\u00bb0&Prime; z_index=\u00a0\u00bb0&Prime; uncode_shortcode_id=\u00a0\u00bb104431&Prime;][vc_column_inner column_width_percent=\u00a0\u00bb100&Prime; gutter_size=\u00a0\u00bb3&Prime; overlay_alpha=\u00a0\u00bb50&Prime; shift_x=\u00a0\u00bb-2&Prime; shift_y=\u00a0\u00bb0&Prime; shift_y_down=\u00a0\u00bb0&Prime; z_index=\u00a0\u00bb0&Prime; medium_width=\u00a0\u00bb0&Prime; mobile_width=\u00a0\u00bb0&Prime; width=\u00a0\u00bb7\/12&Prime; uncode_shortcode_id=\u00a0\u00bb127737&Prime;][vc_single_image media=\u00a0\u00bb105669&Prime; media_width_percent=\u00a0\u00bb100&Prime; uncode_shortcode_id=\u00a0\u00bb190796&Prime;][\/vc_column_inner][vc_column_inner column_width_percent=\u00a0\u00bb100&Prime; position_vertical=\u00a0\u00bbmiddle\u00a0\u00bb gutter_size=\u00a0\u00bb2&Prime; overlay_alpha=\u00a0\u00bb50&Prime; shift_x=\u00a0\u00bb0&Prime; shift_y=\u00a0\u00bb0&Prime; shift_y_down=\u00a0\u00bb0&Prime; z_index=\u00a0\u00bb0&Prime; medium_width=\u00a0\u00bb0&Prime; mobile_width=\u00a0\u00bb0&Prime; css_animation=\u00a0\u00bbbottom-t-top\u00a0\u00bb animation_delay=\u00a0\u00bb300&Prime; width=\u00a0\u00bb5\/12&Prime; uncode_shortcode_id=\u00a0\u00bb218625&Prime; css=\u00a0\u00bb.vc_custom_1748424728366{padding-right: 30px !important;}\u00a0\u00bb][vc_custom_heading heading_semantic=\u00a0\u00bbh3&Prime; text_size=\u00a0\u00bbh3&Prime; uncode_shortcode_id=\u00a0\u00bb140895&Prime;]La m\u00e9thode TDEM (Time Domain Electromagnetics), \u00e9galement appel\u00e9e TEM ou PEM, est une technique g\u00e9ophysique non invasive utilis\u00e9e pour \u00e9tudier la r\u00e9sistivit\u00e9 \u00e9lectrique du sous-sol, efficace jusqu\u2019\u00e0 des profondeurs de 300 \u00e0 500 m\u00e8tres.[\/vc_custom_heading][vc_empty_space empty_h=\u00a0\u00bb1&Prime;][vc_column_text uncode_shortcode_id=\u00a0\u00bb342088&Prime;]La technique repose sur l\u2019induction \u00e9lectromagn\u00e9tique : une bobine \u00e9mettrice (Tx), connect\u00e9e \u00e0 un g\u00e9n\u00e9rateur portable, envoie un courant puls\u00e9 (onde carr\u00e9e \u00e0 phase nulle) \u00e0 travers une spire de fil (carr\u00e9e, rectangulaire ou circulaire) pos\u00e9e sur le sol. Lorsque le courant est interrompu, l\u2019extinction rapide g\u00e9n\u00e8re une variation du champ magn\u00e9tique primaire, qui induit dans le sol des courants induits (courants de Foucault). Ces courants se propagent vers le bas et produisent un champ magn\u00e9tique secondaire, d\u00e9tect\u00e9 par une bobine r\u00e9ceptrice (Rx).[\/vc_column_text][vc_column_text uncode_shortcode_id=\u00a0\u00bb679499&Prime;]La mesure est effectu\u00e9e pendant la phase d\u2019extinction du champ primaire, permettant de d\u00e9tecter la d\u00e9croissance temporelle du champ secondaire avec une grande sensibilit\u00e9. La vitesse et la forme de cette d\u00e9croissance sont directement corr\u00e9l\u00e9es \u00e0 la r\u00e9sistivit\u00e9 du terrain : plus la conductivit\u00e9 est \u00e9lev\u00e9e (c\u2019est-\u00e0-dire plus la r\u00e9sistivit\u00e9 est faible), plus le champ secondaire persistera.[\/vc_column_text][vc_empty_space empty_h=\u00a0\u00bb3&Prime; desktop_visibility=\u00a0\u00bbyes\u00a0\u00bb mobile_visibility=\u00a0\u00bbyes\u00a0\u00bb][vc_empty_space empty_h=\u00a0\u00bb2&Prime; desktop_visibility=\u00a0\u00bbyes\u00a0\u00bb medium_visibility=\u00a0\u00bbyes\u00a0\u00bb][\/vc_column_inner][\/vc_row_inner][\/vc_column][\/vc_row][vc_row unlock_row_content=\u00a0\u00bbyes\u00a0\u00bb row_height_percent=\u00a0\u00bb0&Prime; override_padding=\u00a0\u00bbyes\u00a0\u00bb h_padding=\u00a0\u00bb2&Prime; top_padding=\u00a0\u00bb0&Prime; bottom_padding=\u00a0\u00bb3&Prime; overlay_alpha=\u00a0\u00bb50&Prime; gutter_size=\u00a0\u00bb3&Prime; column_width_percent=\u00a0\u00bb100&Prime; shift_y=\u00a0\u00bb0&Prime; 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position_vertical=\u00a0\u00bbbottom\u00a0\u00bb gutter_size=\u00a0\u00bb2&Prime; style=\u00a0\u00bbdark\u00a0\u00bb back_color=\u00a0\u00bbcolor-172302&Prime; overlay_alpha=\u00a0\u00bb50&Prime; shift_x=\u00a0\u00bb0&Prime; shift_y=\u00a0\u00bb0&Prime; shift_y_down=\u00a0\u00bb0&Prime; z_index=\u00a0\u00bb0&Prime; medium_width=\u00a0\u00bb0&Prime; mobile_width=\u00a0\u00bb0&Prime; width=\u00a0\u00bb3\/12&Prime; uncode_shortcode_id=\u00a0\u00bb712395&Prime; back_color_type=\u00a0\u00bbuncode-palette\u00a0\u00bb][vc_custom_heading heading_semantic=\u00a0\u00bbh4&Prime; text_size=\u00a0\u00bbh4&Prime; text_transform=\u00a0\u00bbuppercase\u00a0\u00bb uncode_shortcode_id=\u00a0\u00bb558518&Prime;]Domaines d\u2019application :\u2028[\/vc_custom_heading][vc_empty_space empty_h=\u00a0\u00bb1&Prime;][vc_separator sep_color=\u00a0\u00bbaccent\u00a0\u00bb uncode_shortcode_id=\u00a0\u00bb170617&Prime; sep_color_type=\u00a0\u00bbuncode-palette\u00a0\u00bb][vc_custom_heading heading_semantic=\u00a0\u00bbp\u00a0\u00bb text_size=\u00a0\u00bb\u00a0\u00bb uncode_shortcode_id=\u00a0\u00bb183648&Prime;]G\u00e9ologie structurale[\/vc_custom_heading][vc_separator sep_color=\u00a0\u00bbaccent\u00a0\u00bb uncode_shortcode_id=\u00a0\u00bb170617&Prime; sep_color_type=\u00a0\u00bbuncode-palette\u00a0\u00bb][vc_custom_heading heading_semantic=\u00a0\u00bbp\u00a0\u00bb text_size=\u00a0\u00bb\u00a0\u00bb uncode_shortcode_id=\u00a0\u00bb169035&Prime;]Recherche hydrog\u00e9ologique[\/vc_custom_heading][vc_separator sep_color=\u00a0\u00bbaccent\u00a0\u00bb uncode_shortcode_id=\u00a0\u00bb170617&Prime; sep_color_type=\u00a0\u00bbuncode-palette\u00a0\u00bb][\/vc_column_inner][vc_column_inner column_width_percent=\u00a0\u00bb100&Prime; position_vertical=\u00a0\u00bbbottom\u00a0\u00bb gutter_size=\u00a0\u00bb2&Prime; style=\u00a0\u00bbdark\u00a0\u00bb back_color=\u00a0\u00bbcolor-172302&Prime; overlay_alpha=\u00a0\u00bb50&Prime; shift_x=\u00a0\u00bb0&Prime; shift_y=\u00a0\u00bb0&Prime; shift_y_down=\u00a0\u00bb0&Prime; z_index=\u00a0\u00bb0&Prime; medium_width=\u00a0\u00bb0&Prime; mobile_width=\u00a0\u00bb0&Prime; width=\u00a0\u00bb3\/12&Prime; uncode_shortcode_id=\u00a0\u00bb594545&Prime; back_color_type=\u00a0\u00bbuncode-palette\u00a0\u00bb][vc_separator sep_color=\u00a0\u00bbaccent\u00a0\u00bb medium_visibility=\u00a0\u00bbyes\u00a0\u00bb mobile_visibility=\u00a0\u00bbyes\u00a0\u00bb uncode_shortcode_id=\u00a0\u00bb472050&Prime; sep_color_type=\u00a0\u00bbuncode-palette\u00a0\u00bb][vc_custom_heading heading_semantic=\u00a0\u00bbp\u00a0\u00bb text_size=\u00a0\u00bb\u00a0\u00bb uncode_shortcode_id=\u00a0\u00bb150632&Prime;]Prospection mini\u00e8re[\/vc_custom_heading][vc_separator sep_color=\u00a0\u00bbaccent\u00a0\u00bb uncode_shortcode_id=\u00a0\u00bb170617&Prime; sep_color_type=\u00a0\u00bbuncode-palette\u00a0\u00bb][vc_custom_heading heading_semantic=\u00a0\u00bbp\u00a0\u00bb text_size=\u00a0\u00bb\u00a0\u00bb uncode_shortcode_id=\u00a0\u00bb122531&Prime;]Cartographie des contaminants[\/vc_custom_heading][vc_separator sep_color=\u00a0\u00bbaccent\u00a0\u00bb uncode_shortcode_id=\u00a0\u00bb170617&Prime; sep_color_type=\u00a0\u00bbuncode-palette\u00a0\u00bb][\/vc_column_inner][vc_column_inner column_width_percent=\u00a0\u00bb100&Prime; gutter_size=\u00a0\u00bb3&Prime; overlay_alpha=\u00a0\u00bb50&Prime; shift_x=\u00a0\u00bb0&Prime; shift_y=\u00a0\u00bb0&Prime; shift_y_down=\u00a0\u00bb0&Prime; z_index=\u00a0\u00bb0&Prime; 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mobile_width=\u00a0\u00bb0&Prime; width=\u00a0\u00bb1\/1&Prime; uncode_shortcode_id=\u00a0\u00bb172332&Prime; back_color_type=\u00a0\u00bbuncode-palette\u00a0\u00bb][vc_custom_heading heading_semantic=\u00a0\u00bbh4&Prime; text_size=\u00a0\u00bbh4&Prime; text_transform=\u00a0\u00bbuppercase\u00a0\u00bb uncode_shortcode_id=\u00a0\u00bb113589&Prime;]Domaines d\u2019application :\u2028[\/vc_custom_heading][vc_empty_space empty_h=\u00a0\u00bb1&Prime;][vc_separator sep_color=\u00a0\u00bbaccent\u00a0\u00bb uncode_shortcode_id=\u00a0\u00bb170617&Prime; sep_color_type=\u00a0\u00bbuncode-palette\u00a0\u00bb][vc_custom_heading heading_semantic=\u00a0\u00bbp\u00a0\u00bb text_size=\u00a0\u00bb\u00a0\u00bb uncode_shortcode_id=\u00a0\u00bb127972&Prime;]G\u00e9ologie structurale[\/vc_custom_heading][vc_separator sep_color=\u00a0\u00bbaccent\u00a0\u00bb uncode_shortcode_id=\u00a0\u00bb170617&Prime; sep_color_type=\u00a0\u00bbuncode-palette\u00a0\u00bb][vc_custom_heading heading_semantic=\u00a0\u00bbp\u00a0\u00bb text_size=\u00a0\u00bb\u00a0\u00bb uncode_shortcode_id=\u00a0\u00bb176759&Prime;]Recherche hydrog\u00e9ologique[\/vc_custom_heading][vc_separator sep_color=\u00a0\u00bbaccent\u00a0\u00bb uncode_shortcode_id=\u00a0\u00bb170617&Prime; sep_color_type=\u00a0\u00bbuncode-palette\u00a0\u00bb][vc_custom_heading heading_semantic=\u00a0\u00bbp\u00a0\u00bb text_size=\u00a0\u00bb\u00a0\u00bb uncode_shortcode_id=\u00a0\u00bb146947&Prime;]Prospection mini\u00e8re[\/vc_custom_heading][vc_separator sep_color=\u00a0\u00bbaccent\u00a0\u00bb uncode_shortcode_id=\u00a0\u00bb170617&Prime; sep_color_type=\u00a0\u00bbuncode-palette\u00a0\u00bb][vc_custom_heading heading_semantic=\u00a0\u00bbp\u00a0\u00bb text_size=\u00a0\u00bb\u00a0\u00bb uncode_shortcode_id=\u00a0\u00bb161222&Prime;]Cartographie des contaminants[\/vc_custom_heading][vc_separator sep_color=\u00a0\u00bbaccent\u00a0\u00bb uncode_shortcode_id=\u00a0\u00bb170617&Prime; sep_color_type=\u00a0\u00bbuncode-palette\u00a0\u00bb][\/vc_column_inner][\/vc_row_inner][\/vc_column][\/vc_row][vc_row][vc_column width=\u00a0\u00bb1\/1&Prime;][uncode_block id=\u00a0\u00bb108212&Prime;][\/vc_column][\/vc_row]<\/p>\n<\/div>","protected":false},"excerpt":{"rendered":"<p>[vc_row row_height_percent=\u00a0\u00bb100&Prime; 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